nb-vav user manual

NB-VAV USER MANUAL

SMART BUILDING SOLUTIONSSMART BUILDING SOLUTIONS

NB-VAV User Manual

Part Number 1E-04-00-0115

Updated - 5/2/2007

© 2007 American Auto-MatrixTM

This document is protected by copyright and is the property of American Auto-Matrix. It may not be used or copied in whole or in part for any purpose other than that for which it is supplied without authorization. This document does not constitute any warranty, expressed or implied.

Every effort has been made to ensure that all information was correct at the time of publication. American Auto-Matrix reserves the right to alter specifications, performance, capabilities and presentation of this product at any time.

American Auto-Matrix and Auto-Matrix are trademarks of American Auto-Matrix and are not to be used for publication without the written consent of American Auto-Matrix.

All other brand names or product names are trademarks or registered trademarks of their respective com-panies or organizations.

WORLD HEADQUARTERS

American Auto-MatrixOne Technology LaneExport, Pennsylvania 15632-8903 USATel (1) 724-733-2000Fax (1) 724-327-6124Email [email protected]

REVISION HISTORY

NB-VAV User Manual (5/2/2007) iii

Updated 5/2/2007 Corresponds to Firmware Revision v5.00 Updated to use date revision scheme Removed BOx;OI property

Version 1.2 Implementation of Indoor Air Quality application. Universal Input 3 added to SBC-VAV(r/t/a/f) controller line Corrected various spelling errors found during manual review Added additional configuration steps for Dual Duct Configuration

Version 1.1(Corresponds to firmware revision 3.0)

Changed number of triacs on NB-VAVta and NB-VAVtf models from three (3) to five (5) in §1.1, §1.4.4,§1.4.5, and §2.4.2.5.

Added section 2.2 Changing the Actuator Orientation. Default baud rate changed to 38400 (CP=6). Appendix A - Fixed description of Flow Control:CK. Fixed typographic errors

Version 1.0 - Initial Manual Release

REVISION HISTORY

iv NB-VAV User Manual (5/2/2007)

TABLE OF CONTENTS

NB-VAV User Manual (5/2/2007) v

1.1 What Is the NB-VAV? .................................................................................. 1-31.1.1 Features of the NB-VAV Controllers .............................................. 1-3

1.2 Inputs/Outputs ............................................................................................. 1-51.2.1 Universal Inputs (UI) ...................................................................... 1-51.2.2 Outputs .......................................................................................... 1-5

1.3 Components and Features .......................................................................... 1-91.3.1 Motor Management Technology (MMT)......................................... 1-91.3.2 Integration With SBC-STATs ......................................................... 1-91.3.3 Networking ................................................................................... 1-101.3.4 Flow Sensor ................................................................................. 1-10

1.4 NB-VAV Controllers ................................................................................... 1-111.4.1 The NB-VAVra ............................................................................. 1-111.4.2 The NB-VAVrf .............................................................................. 1-111.4.3 The NB-VAVta(-IAQ).................................................................... 1-111.4.4 The NB-VAVtf(-IAQ)..................................................................... 1-11

1.5 Specifications............................................................................................. 1-121.5.1 Networking ................................................................................... 1-121.5.2 Integrated Components ............................................................... 1-121.5.3 Actuator Motor ............................................................................. 1-121.5.4 Terminations ................................................................................ 1-121.5.5 Input Supply ................................................................................. 1-121.5.6 Operating Environment ................................................................ 1-121.5.7 Dimensions .................................................................................. 1-121.5.8 Agency Approvals ........................................................................ 1-12

2.1 Installation.................................................................................................... 2-32.2 Changing the Actuator Orientation .............................................................. 2-42.3 Mounting ...................................................................................................... 2-82.4 Connecting the Airflow Sensor .................................................................. 2-102.5 Wiring Requirements ................................................................................. 2-13

2.5.1 Connecting Unitary Controllers to Interfacing Devices ................ 2-132.5.2 Input & Output Wiring................................................................... 2-182.5.3 SBC-STAT ................................................................................... 2-232.5.4 Optional Actuator Wiring .............................................................. 2-25

3.1 Introduction .................................................................................................. 3-33.2 Objects/Properties ....................................................................................... 3-4

3.2.1 Device ............................................................................................ 3-43.2.2 Zone Temperature ....................................................................... 3-133.2.3 Universal Inputs 1-3 (AI01, AI02, AI03) ....................................... 3-263.2.4 Flow Control................................................................................. 3-333.2.5 Supply Temperature .................................................................... 3-413.2.6 Analog Output (AO01) ................................................................. 3-443.2.7 Heat and Cool Setpoints (Analog Values) ................................... 3-473.2.8 Binary Outputs (BO01-BO05) ..................................................... 3-503.2.9 Schedule ...................................................................................... 3-553.2.10 Holiday Calendar ....................................................................... 3-58

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vi NB-VAV User Manual (5/2/2007)

3.2.11 Flow Setpoints........................................................................... 3-593.2.12 Electric Reheat.......................................................................... 3-633.2.13 Valve Ctrl 1-2 ............................................................................ 3-663.2.14 Analog Control .......................................................................... 3-713.2.15 Occupancy Detector.................................................................. 3-783.2.16 Proof of Flow............................................................................. 3-803.2.17 Broadcast Schedule .................................................................. 3-82

4.1 Scheduling .................................................................................................. 4-34.1.1 Inactive Schedule State ................................................................ 4-44.1.2 Broadcast Schedule ...................................................................... 4-44.1.3 Power-up State ............................................................................. 4-44.1.4 Host Override................................................................................ 4-54.1.5 User Override................................................................................ 4-54.1.6 Occupancy Detection.................................................................... 4-6

4.2 Setting the Temperature and Flow Setpoints.............................................. 4-74.3 NB-VAV Control Modes .............................................................................. 4-9

4.3.1 Constant Air Volume (CAV) .......................................................... 4-94.3.2 Supply Dependent (VST) ............................................................ 4-104.3.3 Heating Only ............................................................................... 4-144.3.4 Cooling Only................................................................................ 4-184.3.5 Cooling with Reheat .................................................................... 4-21

4.4 Auxiliary Functions.................................................................................... 4-264.4.1 Series Fan................................................................................... 4-264.4.2 Parallel Fan................................................................................. 4-264.4.3 Induction Damper........................................................................ 4-274.4.4 Valve Control............................................................................... 4-27

4.5 Digital Outputs .......................................................................................... 4-354.6 Dual Duct Application................................................................................ 4-364.7 Tracking ................................................................................................... 4-404.8 Indoor Air Quality ...................................................................................... 4-415.1 Temperature Display................................................................................... 5-35.2 Setpoint Adjustment Display ....................................................................... 5-4

5.2.1 SBC-STAT2 .................................................................................. 5-45.2.2 SBC-STAT2-D............................................................................... 5-45.2.3 SBC-STAT3 .................................................................................. 5-4

5.3 Calculated Setpoint Display ........................................................................ 5-55.4 LED............................................................................................................. 5-65.5 Override Mode ............................................................................................ 5-75.6 Menu Actions .............................................................................................. 5-8

5.6.1 Enable/Disable Values.................................................................. 5-85.6.2 Setting Values............................................................................... 5-8

5.7 SBC-STAT3 Menus .................................................................................... 5-95.7.1 User Menu..................................................................................... 5-95.7.2 Install Menu................................................................................. 5-105.7.3 Balance Menu ............................................................................. 5-11

TABLE OF CONTENTS

NB-VAV User Manual (5/2/2007) vii

5.7.4 Service Menu............................................................................... 5-15 Device.............................................................................................................. A-1 Zone Temperature - AI00 ................................................................................ A-3 Universal Inputs 1-2 - UI01-UI02 ..................................................................... A-5 Flow Control..................................................................................................... A-6 Supply Temperature ........................................................................................ A-7 Analog Output - AO01 ..................................................................................... A-7 Fan Digital Output - BO01 ............................................................................... A-7 Digital Outputs 2-5 - BO02-BO05 .................................................................... A-7 Schedule.......................................................................................................... A-8 Flow Setpoints ................................................................................................. A-8 Electric Reheat ................................................................................................ A-9 Valve Ctrl 1-2 ................................................................................................... A-9 Analog Control ............................................................................................... A-10 Occupancy Detector ...................................................................................... A-10 Proof of Flow.................................................................................................. A-10 Broadcast Schedules..................................................................................... A-11

TABLE OF CONTENTS

viii NB-VAV User Manual (5/2/2007)

NB-VAV User Manual (5/2/2007) 1-1

IN THIS SECTIONWhat Is the NB-VAV?................................................................................................................................................... 1-3 Features of the NB-VAV Controllers ....................................................................................................................... 1-3Inputs/Outputs ............................................................................................................................................................. 1-5 Universal Inputs (UI) ............................................................................................................................................... 1-5 Outputs ................................................................................................................................................................... 1-5Components and Features .......................................................................................................................................... 1-9 Motor Management Technology (MMT).................................................................................................................. 1-9 Integration With SBC-STATs................................................................................................................................... 1-9 Networking............................................................................................................................................................ 1-10 Flow Sensor.......................................................................................................................................................... 1-10NB-VAV Controllers ....................................................................................................................................................1-11 The NB-VAVra........................................................................................................................................................1-11 The NB-VAVrf.........................................................................................................................................................1-11 The NB-VAVta(-IAQ)..............................................................................................................................................1-11 The NB-VAVtf(-IAQ)...............................................................................................................................................1-11

Specifications ......................................................................................................................................................... 1-12

SECTION 1: OVERVIEW

This document provides general information regarding the NB-VAV model Unitary Controllers.The various NB-VAV controllers can be used in a wide variety of VAV and CAV applications.

SECTION 1: OVERVIEW

1-2 NB-VAV User Manual (5/2/2007)

SECTION 1: OVERVIEW WHAT IS THE NB-VAV?


1.1 WHAT IS THE NB-VAV?

The NB-VAV model controllers are variable air volume (VAV) and constant air volume (CAV) terminal boxdigital controllers that comply with ANSI/ASHRAE Standard 135-2001, BACnet. There are five (5) NB-VAVcontroller types (refer to Table 1-1, “NB-VAV Models,” on page 3) that can be employed in differentapplications.

1.1.1 FEATURES OF THE NB-VAV CONTROLLERS Can communicate with third party BACnet-MS/TP devices such as Unitary Controllers or Area Control-

lers over EIA-485 (RS-485) Optically isolated triac solid-state relay outputs with metal oxide varistors (MOV) (NB-VAVta and -

VAVtf) Mechanical relays equipped with a tranzorb protection device to suppress transients and contact arc-

ing (NB-VAVra and NB-VAVrf) Analog outputs with 0-10VDC range, 8-bit resolution 15-bit resolution universal inputs (UI) Automatic settings for VAV or CAV control mode Separate heating and cooling options for supply mode Motor Management TechnologyTM (MMTTM) for monitoring, identifying, and correcting motor shorts An integrated Belimo® LM24-10P-M feedback actuator that allows you to monitor the position of the

damper at all times or an integrated Belimo LM24-M actuator An on-board, solid-state airflow sensor that measures the airflow and enables the calibration of airflow

measurement for a wide range of VAV and CAV terminal box sizes and types

Table 1-1 NB-VAV Models

NB-VAV Controller Triacs Relays

Analog Outputs

Universal Inputs

STAT-BUS

Real-time Clock

Airflow Sensor Actuator

NB-VAVra None 5 1 2 1 External Option Yes Yes

NB-VAVrf None 5 1 2 1 External Option Yes Feedback

NB-VAVta 5 None 1 2 1 External Option Yes Yes

NB-VAVta-IAQ 5 None 1 3 1 External Option Yes Yes

NB-VAVtf 5 None 1 2 1 External Option Yes Feedback

NB-VAVtf-IAQ 5 None 1 3 1 External Option Yes Feedback

NOTEThe term NB-VAV, used throughout this docu-ment, refers to the NB-VAVra, NB-VAVrf, NB-VAVta, and NB-VAVtf Unitary Controllers.

WHAT IS THE NB-VAV? SECTION 1: OVERVIEW


Flash updates through NB-ProTM for easy incorporation of the latest firmware and application tem-plates.

SECTION 1: OVERVIEW INPUTS/OUTPUTS


1.2 INPUTS/OUTPUTS

1.2.1 UNIVERSAL INPUTS (UI)The NB-VAV’s UIs at Terminal Block (TB) 1 are high resolution (15-bit) UIs that can accept 0-20mA whenin current mode, 0-1MΩ inputs when in resistance mode, or 0-10VDC when in voltage mode. A capacitor inthe circuit provides a 10Hz low-pass filter. Overrange protection is provided to clamp normal overrangeconditions and to protect against damage from electrostatic discharge (ESD). The UIs can be configuredfor alarming, setup/setback, filtering, and input polarity.

Figure 1-1: The IVR Pin Terminal Block Located Above TB1

1.2.2 OUTPUTS

1.2.2.1 DIGITAL OUTPUTSDigital Outputs (DOs) provide ON/OFF control of output devices such as fans, valves, or cooling or reheatstages. There are two types of DOs: optically-isolated triac solid-state (triacs) and mechanical relay(relays). Relays and triacs have identical logical operation. However, they have different physical operating

NOTEJumper between:I and V pins for current mode; andR and V pins for resistance mode.No jumper = voltage mode.

IVR Pin Terminal Block

TB1

INPUTS/OUTPUTS SECTION 1: OVERVIEW


conditions. All DOs enforce minimum cycle time operation, determine the polarity (ON/OFF), and provide aruntime alarm limit for the output.

Relays have a 1A, 24VAC/DC rated load, normally open, non-polar contact. A tranzorb protection device isprovided to suppress transients and contact arcing. Pulse width modulation (PWM) operation of floatingvalves or other devices is not recommended with relays.

Triacs have a 1A, 24VAC rated load, normally open, non-polar contact. An MOV protection device isprovided to suppress transients. Triacs are recommended for PWM operation of floating valves, dampermotors, etc. Triacs will switch a 1A, 24VDC load, but they will not turn off until the load power is removed.

The NB-VAVta, NB-VAVtf, NB-VAVta-IAQ, and NB-VAVtf-IAQ controllers have five (5) triac outputs at TB3terminals 11 through 20. The triac outputs are suitable for driving pilot duty relays, PWM valve actuators,and floating setpoint valve actuators. Each triac output is capable of tracking the amount of time that theoutput is considered to be engaged (runtime hours).

The NB-VAVra, and NB-VAVrf controllers have (5) relay outputs at TB3 terminals 11 and 12 (K1), 13 and14 (K2),15 and 16 (K3), 17 and 18 (K4), and 19 and 20 (K5).

The first DO (marked K1 on the PCB) is the Fan Digital Output. It is dedicated for the use of series fan,parallel fan, or induction damper binary control.

The second DO (marked K2 on the PCB) can: control one stage of reheat; function as the increaseposition signal when driving a valve; or function as the PWM output when PWM is used for chilled/hotwater valve positioning.

The third DO (marked K3 on the PCB) can control one stage of reheat or can serve as the decreaseposition signal when driving a valve.

The fourth DO (marked K4 on the PCB) can control one stage of reheat or function as the increaseposition signal for motor control.

CAUTIONTriacs will switch a 1A, 24VDC load, but theywill not turn off until the load power isremoved.

NOTEAAM recommends that output loads bewired so that one side of the load isgrounded when possible.

SECTION 1: OVERVIEW INPUTS/OUTPUTS


The fifth DO (marked K5 on the PCB) can control one stage of reheat or function as the decrease positionsignal for motor control.

1.2.2.2 ANALOG OUTPUTSYou can control analog outputs (AO) automatically, manually, or by a program over the communicationsnetwork. When set to automatic control, the output is dedicated to the analog control proportional +integral + derivative (PID) loop. Modulation of reheat valves, radiation valves, actuators, or lighting ballastsis a suitable application for the AO, which has 0–10VDC and 8-bit resolution.

Table 1-2 NB-VAV Input and Output Assignments

Terminal I/O Description

1 (TB5) SSB SSB Signal

2 (TB5) COM SSB Common

3 (TB5) AO1 Analog Output Channel 1

4 (TB5) COM Analog Output Common

11 (TB3) K1

Relay 1 Common - (NB-VAVra, and NB-VAVrf controller types only)or,Triac Output 1 - (NB-VAVta and -VAVtf controller types only)

12 (TB3) K1

Relay 1 Normally Open - (NB-VAVra, and NB-VAVrf controller types only)or,Triac Output 1 - (NB-VAVta and -VAVtf controller types only)

13 (TB3) K2


14 (TB3) K2


15 (TB3) K3


16 (TB3) K3


INPUTS/OUTPUTS SECTION 1: OVERVIEW


17 (TB3) K4


18 (TB3) K4


19 (TB3) K5


20 (TB3) K5


21 (TB4) AC Line 24 Volt AC Control Power Input

22 (TB4) AC AUX 24 Volt AC Auxiliary Output for DC Loads (5A Fuse)

23 (TB4) AC RET 24 Volt AC Neutral

24 (TB2) N+ Positive 485 Network Communication Line

25 (TB2) N- Negative 485 Network Communication Line

30 (TB1) UI3 Universal Input 3 (IAQ Models Only)

31 (TB1) COM Common (IAQ Models Only)

32 (TB1) UI2 Universal Input 2

33 (TB1) COM Common

34 (TB1) UI1 Universal Input 1

35 (TB1) COM Common

Table 1-2 NB-VAV Input and Output Assignments

Terminal I/O Description

SECTION 1: OVERVIEW COMPONENTS AND FEATURES


1.3 COMPONENTS AND FEATURES

1.3.1 MOTOR MANAGEMENT TECHNOLOGY (MMT)MMT extends the functions of the Belimo LM24-M (supplied with the NB-VAVra and NB-VAVta) and theLM24-10P-M (supplied with the NB-VAVrf and NB-VAVtf) actuators via: Alarm generation upon actuator disconnect, reconnect, or failure; Motor short detection and correction; End of travel detection; and Motor usage monitoring for energy conservation.

The MMT circuit measures both the motor current and voltage to detect normal, overload, stall, andshorted conditions. In case of commutator or brush shorts, the MMT circuit provides a clearing pulse toremove small amounts of debris.

1.3.2 INTEGRATION WITH SBC-STATSTerminal Block 5/SSB (TB5:SSB) is a non-polar, two wire, bidirectional sensor bus that can be used ineither digital or analog mode. In analog mode, it supports the SBC-STAT1TM and SBC-STAT2TM. In digitalmode, it can communicate with multiple SSB digital devices such as the SBC-STAT3TM, SBC-STAT1-DTM,and SBC-STAT2-DTM. Mode switching is automatic and any SSB digital device will override any analogdevice.

NOTEMMT functions only on NB-VAV controllersconnected to Belimo LM24-M and LM24-10P-M model actuators.

NOTEThe Siemens GDE131.1U and the NeptronicBBT 24 have been tested and approved byAAM; however, most industry actuators arecompatible with the NB-VAV family ofcontrollers.

NOTEThe NB-VAVta and -VAVtf have only three(3) digital outputs and are not capable ofoperating any external actuators.

COMPONENTS AND FEATURES SECTION 1: OVERVIEW


Through the SBC-STAT Bus (SSB), the NB-VAV controllers can communicate with SBC-STAT thermostatswithout the use of an I/O point on the controller. The NB-VAV controllers can support one (1) analog SBC-STAT, or up to four (4) digital SBC-STATs through the SSB.

The SSB can be used to link two or more NB-VAV controllers for certain applications. When using the SSBto link NB-VAV controllers, one controller must be configured as a master, and all other controllers must beconfigured as slaves. In addition, proper polarity must be maintained. Connect SSB to SSB and COM toCOM. Refer to Section 2, Wiring and Installation, for additional information.

1.3.3 NETWORKINGUnitary controllers communicate BACnet MS/TP protocol using two-wire, EIA-485 (RS-485).

Up to 32 devices can be networked together on a single EIA-485 network segment. While expanding pastthis limit may be possible using third-party repeaters or media converters, performance outside of thestated limit cannot be guaranteed or is subject to technical support services by American Auto-Matrix.

1.3.4 FLOW SENSORThe NB-VAV’s on board, solid-state airflow sensor measures the airflow through the terminal box. Airflowmeasurement and calibration for maximum energy efficiency is possible for a wide range of VAV and CAVterminal box sizes and types.

CAUTIONWhen using the SSB to link two NB-VAVcontrollers (as needed for certainapplications), polarity must be maintained.Connect SSB of controller A to SSB ofcontroller B and COM of controller A to COMof Controller B.

SECTION 1: OVERVIEW NB-VAV CONTROLLERS


1.4 NB-VAV CONTROLLERS

1.4.1 THE NB-VAVraThe NB-VAVra has five (5) relay outputs, one (1) AO, and two (2) UIs. The NB-VAVra also includes anintegrated Belimo LM24-M actuator that employs MMT to monitor, identify, and correct motor shorts. Theposition of the controller’s integrated damper motor is controlled by the NB-VAVra’s proportional+integral(PI) control loop.

1.4.2 THE NB-VAVrfThe NB-VAVrf is equipped with five (5) relay outputs, one (1) AO, and two (2) UIs. The NB-VAVrf is alsoequipped with a Belimo LM24-10P-M feedback actuator, which enables you to monitor the damper positionat all times. The position of the controller’s integrated damper motor is controlled by the NB-VAVrf’s PIcontrol loop.

1.4.3 THE NB-VAVta(-IAQ)The NB-VAVta is equipped with five (5) triac solid-state relay outputs, one (1) AO, and three (3) UIs. TheNB-VAVta also includes an integrated Belimo actuator that employs MMT to monitor, identify, and correctmotor shorts. The position of the controller’s integrated damper motor is controlled by the NB-VAVta’s PIcontrol loop.

1.4.4 THE NB-VAVtf(-IAQ)The NB-VAVtf is equipped with five (5) triac solid-state relay outputs, one (1) AO, and three (3) UIs. TheNB-VAVtf also includes an integrated Belimo LM24-10P-M feedback actuator that employs MMT tomonitor, identify, and correct motor shorts. The position of the controller’s integrated damper motor iscontrolled by the NB-VAVtf’s PI control loop. The feedback actuator allows you to monitor the position ofthe damper at all times.

SPECIFICATIONS SECTION 1: OVERVIEW


1.5 SPECIFICATIONS

1.5.1 NETWORKINGThe following specifications are necessary for networking of the NB-VAV controllers: line signaling: EIA-485 wiring: shielded, twisted pair 18-22 AWG network protection: dual tranzorbs, Hi ESD driver communications speed: 9.6k, 19.2k, and 38.4k baud rate, programmable network configuration: multidrop to 5,000ft. (1.5km) total protocol: BACnet MS/TP.

1.5.2 INTEGRATED COMPONENTS LM24-M Belimo actuator (NB-VAVra and NB-VAVta) with floating mount, eliminating damper shaft

stress and binding. LM24-10P-M Belimo feedback actuator (NB-VAVrf and NB-VAVtf) with floating mount, eliminating

damper shaft stress and binding. Flow sensor (0 - 2” wc).

1.5.3 ACTUATOR MOTOR Torque rating: 35in. lbs. (8Nm minimum). Travel time: approximately 85 seconds.

1.5.4 TERMINATIONS Pluggable terminal blocks for inputs, outputs, power, and network connection.

1.5.5 INPUT SUPPLY NEC class 2 transformer (customer-supplied). 22-26VAC, 50/60Hz, 10VA maximum, 5VA typical. 5A fuse load protection. PTC control electronics protection.

1.5.6 OPERATING ENVIRONMENT Temperature range: 0–50°C. Humidity range: 5–95% RH noncondensing.

1.5.7 DIMENSIONS Size: 8.5 in. (21.6 cm) × 4.75 in. (14.6 cm) × 2.63 in. (6.7 cm) and 5.5 in (16.51 cm) × 4.75 in (14.6 cm)

× 1.5 in. (3.81 cm) Shipping weight: 2.04 lbs (.93 kg) and 1.86 lbs (.84 kg)

1.5.8 AGENCY APPROVALS UL listed 916, Management Equipment, Energy (PAZX). UL 873 Component-Temperature-Indicating and Regulating Equipment (XAPX2).

SECTION 1: OVERVIEW SPECIFICATIONS


Complies with FCC rules Part 15, Class B Computing Device. Complies with CE directives and standards.

SPECIFICATIONS SECTION 1: OVERVIEW



IN THIS SECTIONInstallation ................................................................................................................................................................ 2-3Changing the Actuator Orientation........................................................................................................................... 2-4Mounting .................................................................................................................................................................. 2-8Connecting the Airflow Sensor............................................................................................................................... 2-10Wiring Requirements.............................................................................................................................................. 2-13 Connecting Unitary Controllers to Interfacing Devices...................................................................................... 2-13 Input & Output Wiring........................................................................................................................................ 2-18 SBC-STAT......................................................................................................................................................... 2-23 Optional Actuator Wiring ................................................................................................................................... 2-25

SECTION 2: WIRING & INSTALLATION

This section covers mounting, connecting the airflow sensor, and wiring the NB-VAV controllers.Wiring instructions for power, communications, and inputs/outputs appear along with safetyrequirements.

SECTION 2: WIRING & INSTALLATION


SECTION 2: WIRING & INSTALLATION INSTALLATION


2.1 INSTALLATIONThe installation of the NB-VAV controllers involves determining actuator orientation, mounting thecontroller, supplying power, connecting to the communications network, and connecting input and outputdevices. All wiring connections to the NB-VAV are made with the use of plug (female) & socket (male)terminal blocks (TB). The plug consists of terminal ports and adjustment screws. Input/output device,network, and power wires enter the terminal ports and are secured to the assembly with the adjustmentscrews. The socket consists of a row of pins and is permanently mounted to the printed circuit board(PCB).

When connecting/disconnecting the two parts of the TB, align the holes on the plug with the pins on thesocket and avoid twisting, thus damaging the assembly. Such damage will void the product warranty.

WARNINGThe sockets to which the terminal block plugsconnect are permanently attached to the PCB.Twisting or applying torque when connecting/disconnecting will result in damage that will voidthe product warranty.

WARNINGNB-VAV controllers should only be used in amanner specified by the manufacturer.

WARNINGOnly trained personnel should service NB-VAVcontrollers. No operator replaceable parts existin NB-VAV type controllers.

WARNINGRemove power before servicing.

CHANGING THE ACTUATOR ORIENTATION SECTION 2: WIRING & INSTALLATION


2.2 CHANGING THE ACTUATOR ORIENTATIONDepending on the specifics of a particular job, it may be advantageous to have the actuator mounted to theleft or right of the controller. This may be due to the mounting site, the direction of wiring, etc. The NB-VAVallows you to reverse the orientation of the actuator by changing the mounting clip. The metal workconsists of two pieces, the baseplate and the mounting clip, shown in Figure 2-1. The mounting clip isremovable and can be reversed to provide mounting options with the actuator on the left or right side.

Figure 2-1 NB-VAV Metalwork

Before reversing the orientation of the actuator mounting clip you must first remove the actuator byunplugging the cable connecting the actuator to the controller and removing the screws from the reverseside of the controller which hold the actuator.

Baseplate

Mounting Clip

SECTION 2: WIRING & INSTALLATION CHANGING THE ACTUATOR ORIENTATION


To reverse the orientation of the actuator mounting clip, you must perform the following steps:

1. Press on the locking tab to release the mounting clip. While maintaining pressure on the tab, slide the mounting clip to the end of the slots.

Figure 2-2 Unlock Actuator Mounting Clip

2. Remove the mounting clip from the baseplate.

Figure 2-3 Remove Actuator Mounting Clip

CHANGING THE ACTUATOR ORIENTATION SECTION 2: WIRING & INSTALLATION


3. Rotate the mounting clip.

Figure 2-4 Rotate Mounting Clip

4. Insert the mounting clip into the other set of slots.

Figure 2-5 Insert Mounting Clip in Slots

SECTION 2: WIRING & INSTALLATION CHANGING THE ACTUATOR ORIENTATION


5. Slide the mounting clip towards the edge of the baseplate until the locking tab clicks into place.

Figure 2-6 Slide Clip Into Place

MOUNTING SECTION 2: WIRING & INSTALLATION


2.3 MOUNTINGPerform the following procedure to mount the NB-VAV controller.

1. Loosen the 10mm hex nuts of the U-bolt attached to the damper clamp.2. Adjust the alignment of the actuator to the mounting bracket so that the screw attaching the two parts

fits snugly into the bottom portion of the diamond shaped hole on the bracket.3. Place the damper clamp around the damper shaft and position the NB-VAV controller on the terminal

box so that at least two (2) of the controller backing’s mounting holes are on the terminal box. Make sure that the bottom of the actuator is flush with the bottom of the sheet metal plate behind it.

4. Hand tighten the 10mm hex nuts to temporarily secure the damper clamp to the damper shaft.

5. If you are not using self-drilling mounting screws, use the controller backing as a template and mark the mounting hole locations on the terminal box. Remove the controller, then drill pilot holes in the ter-minal box. AAM recommends that at least two (2) screws be used to secure the NB-VAV controller to the terminal box.

CAUTIONThe mounting area should be free frommoisture.

CAUTIONThe metal of the NB-VAV mounting bracketmust make contact with the metal of theterminal box and the terminal box must begrounded to a true earth ground. Otherwise,electrical and communications problems arelikely to occur.

NOTEAAM recommends the use of self-drillingmounting screws for securing the controllerto the terminal box. Mounting screws usedto secure the controller to the terminal boxare not supplied with the NB-VAVcontrollers.

SECTION 2: WIRING & INSTALLATION MOUNTING


6. Align the mounting holes of the NB-VAV controller with the pilot holes drilled in Step 5 and secure the controller to the terminal box using mounting screws. Mounting screws used to secure the controller to the terminal box are not supplied with the NB-VAV controllers.

7. Set the damper and actuator to 50 percent and fully tighten the damper clamp’s 10mm hex nuts.8. Adjust the hard stops of the damper clamp by loosening the screws that appear on top of the stops.

Move the stops to the desired positions, and tighten the associated screws.

CONNECTING THE AIRFLOW SENSOR SECTION 2: WIRING & INSTALLATION


2.4 CONNECTING THE AIRFLOW SENSORThe NB-VAV’s integral airflow sensor is a precision instrument. To prevent dust particles from entering theNB-VAV’s flow sensor, a sealed in-line filter is provided. Place the filter between the input (high) pressureside of the sensor and the high pressure side of the airflow pickup. When installing an NB-VAV typecontroller, connect the low pressure side of the duct airflow pitot to the low pressure side of the airflowsensor and the high pressure side of the duct airflow pitot to the high pressure side of the airflow sensor.Do not twist the sensor at any time.

Figure 2-7: Airflow Sensor Filter

CAUTIONTwisting or applying torque to the airflowsensor will damage the internal componentsof the device. Once damaged, the devicewill either not work at all or will produceinaccurate measurements. If it is determinedthat application caused the damage, thewarranty will become void.

SECTION 2: WIRING & INSTALLATION CONNECTING THE AIRFLOW SENSOR


Figure 2-8: The NB-VAVra and NB-VAVrf (actuator not shown)

CONNECTING THE AIRFLOW SENSOR SECTION 2: WIRING & INSTALLATION


Figure 2-9:NB-VAVta and -VAVtf

SECTION 2: WIRING & INSTALLATION WIRING REQUIREMENTS


2.5 WIRING REQUIREMENTS

Follow the recommended wiring guidelines to reduce the chance of operation and communication errors. Ifyou do not use proper wiring techniques, your site may not meet Federal Communications Commission(FCC) Class A regulations for radio frequency interference (RFI) emissions. All EIA-485 communicationsnetworks should employ shielded, twisted pair wiring. Each twisted pair must be individually shielded.Unshielded cables must be placed in solid metal conduit alone. Communications wiring (as well as SBC-STAT and other input wiring) should not be routed together with—or close to—other wiring carrying DCswitching, AC lines, fluorescent lighting or any other RFI/electromagnetic interference (EMI)-emittingsource. Failure to use these types of conductors may result in various system communications problemssuch as excessive network retries, noise susceptibility, and loss of communication.

2.5.1 CONNECTING UNITARY CONTROLLERS TO INTERFACING DEVICESEnd-users can interface with Unitary Controllers through either a PC (with NB-Pro installed) or areacontroller solution.

2.5.1.1 CONNECTING UNITARY CONTROLLERS TO A PCEnd-users can interface with Unitary Controllers through a PC with American Auto-Matrix’s Windows-based software commissioning tool NB-Pro installed. Using NB-Pro, end-users can modify property valuesand setpoints, as well as manage an entire network of BACnet MS/TP devices.

To interface with the Unitary Controller network using NB-Pro, American Auto-Matrix’s NB-Link and DB25are required.

The NB-Link is an MS/TP device used for establishing BACnet MS/TP communications between UnitaryControllers and a Windows-based work station. The NB-Link submits data requests from the PC to the MS/TP network, and sends the data responses back to the PC.

The DB25 is a device that allows you to connect the NB controllers to the NB-Link.

To interface with the Unitary Controller network through NB-Pro, perform the following:

1. Using 14–22AWG, individually shielded, twisted pair wiring, connect the Tx+ terminal of the DB25 to the N+ terminal (TB2:Terminal 24) of the Unitary Controller. EIA-485 wiring standards always apply.

2. Connect the Rx- terminal of the DB25 to the N- terminal (TB2:Terminal 25) of the Unitary Controller.3. Wire controllers in daisy-chain fashion. Maintain N+ and N- consistency when wiring Unitary Control-

lers for the EIA-485 network. 4. JP6 is an EIA-485 termination resistor of 250Ω. Set the jumper on JP6 of the last device on the net-

work for termination of all EIA-485 networks.5. Connect the DB25 (male 25-pin connector) to the NB-Link (female 25-pin connector).6. Connect one end of an Ethernet cable (not supplied) to the RJ45 (10BaseT) connector on the NB-Link

and the other end of the cable to the PC on which you will be installing NB-Pro.

WARNINGRemove power when performing thefollowing wiring procedures for the NB-VAV.

WIRING REQUIREMENTS SECTION 2: WIRING & INSTALLATION


7. Supply power to the NB-Link using the provided power supply. The required input voltage is 9-30VDC (3W maximum).

Figure 2-10: DB25

Figure 2-11: NB-Link

NOTEIf you are connecting your PC directly to NB-Link, you must use a crossover cable.

Connect the DB25 device (male 25-pin connector) to NB-Link (female25-pin connector).

Connect N+ and N- of the NB UnitaryController to Tx+ and Rx- of the DB25,respectively.

Important!!! Supply power to theNB-Link using the provided powersupply. The required input voltage is9-30VDC (3W maximum).

RJ45 (10BaseT) Connector:Connect to PC on theEthernet network.

Connect the DB25 here



Figure 2-12: Network Wiring



Figure 2-13: Unitary Controllers Connected to PC

2.5.1.2 CONNECTING UNITARY CONTROLLERS TO A SAGETo connect the Unitary Controller network to a SAGEMAX Area Controller, perform the following:

1. Connect N+ and N- of any of the ports on either Trunk A or Trunk B of the SAGEMAX Area Controller to N+ and N- on TB2 of the first Unitary Controller on the network. The SAGEMAX Area Controller port to

NB-VAV

Custom

ogrammable

Equip

e

NB-GPC

AHU's

Chiller Systems

Heating Systems

Multizone Units

Custom

Programmable

Packaged Equipment

NB-ASCe

3rd Party BACnet

MS/TP Devices

Commissionin

Software

SBC STAT-3

Can be

used on all

NB Controllers

SBC STAT-3

Can be used on

all NB Controllers

SBC STAT-3

Can be used on

all NB Controllers

GPC1

GPC1

NB-GPC

AHU's

Chiller Systems

Heating Systems

Multizone Units



which you are connecting the Unitary Controllers must be configured for BACnet MS/TP. Maintain N+ and N- consistency.

2. Connect N+ and N- on TB2 of one controller to N+ and N- on TB2 of the next controller. Wire control-lers in daisy-chain fashion. Maintain N+ and N- consistency when wiring Unitary Controllers for the EIA-485 network. 14–22AWG, individually shielded, twisted pair wiring is recommended for optimal operations. EIA-485 wiring standards always apply.

3. JP6 is an EIA-485 termination resistor of 250Ω. Set the jumper on JP6 of the last device on the net-work for termination of all EIA-485 networks.

2.5.1.3 SUPPLYING POWER TO THE UNITARY CONTROLLERS

You must use a 24VAC 50/60Hz NEC class II transformer rated at 10VA maximum (5VA typical) for powersupply to the NB-VAV. AAM recommends that at least 18AWG wiring be used, but the terminals canaccommodate 14–22AWG. To supply power to the Unitary Controllers:

Connect the 24VAC 50/60Hz NEC class II transformer rated at 10VA maximum to the 24VAC Line(TB4:Terminal 21) and 24VAC NEUT (TB4:Terminal 23) of the Unitary Controller.

Figure 2-14: Wiring 24VAC Power

NOTE

When configuring a SAGEMAX port forBACnet MS/TP, you can only connectdevices to either Trunk A or Trunk B ofthe port. A maximum of 32 devices can beconnected to a SAGEMAX port.

NOTEAAM recommends that each NB-VAV on anetwork has an individual powertransformer.



2.5.2 INPUT & OUTPUT WIRINGThe most common wiring applications for the NB-VAV type controllers appear in the following subsections.You should discuss deviations from the following examples with AAM Technical Support before makingmodifications to controllers. Any modifications other than those supported by AAM may void the productwarranty.2.5.2.1 UI AS VOLTAGE INPUTSpecial consideration must be taken when configuring a UI for a 0–10VDC analog input device. When a UIis used as a 0–10VDC analog input, it is necessary to remove the corresponding IVR jumper from the IVRterminal block located adjacent to TB1.

CAUTIONAAM does not recommend that you sharepower transformers among unitarycontrollers. If this technique is used againstthe recommendations of AAM, AC polaritymust be maintained throughout the powernetwork. Damage will result if two or morenetwork devices sharing the same ACsupply do not have their power correctlypolarized. Such damage voids the productwarranty.

CAUTIONAll power transformers used must be ratedto power all devices connected to them.



Figure 2-15: 0–10VDC Device Used on UI

2.5.2.2 UI AS 4–20MA INPUTWhen configuring a UI for a 4–20mA analog input device, jumper the corresponding I and V pins on theIVR terminal block.

Figure 2-16: 4–20mA Device Used on UI

2.5.2.3 UI AS DIGITAL INPUT When configuring a UI as a digital input device using a dry contact, jumper the corresponding V and Rpins on the IVR terminal block.



Figure 2-17: Dry Contact as Digital Input Using UI

Figure 2-18 IVR Pin-Terminal Block

2.5.2.4 RELAY OUTPUTS

The NB-VAVra, and NB-VAVr controllers have five (5) relay outputs at TB3 terminals 11 and 12 (bothmarked K1 on the PCB), 13 and 14 (both marked K2 on the PCB), 15 and 16 (both marked K3 on thePCB), 17 and 18 (both marked K4 on the PCB), and 19 and 20 (both marked K5 on the PCB). When

NOTEAAM recommends that output loads bewired so that one side of the load isgrounded when possible.

IVR Pin-terminalBlock

TB1



wiring, connect one of the output load wires to either K2 terminal (if using relay number 2), connect theremaining output load wire to a power source wire, then connect the other power source wire to the otherK2 terminal on TB3. For additional information about relays, refer to Section 1, Overview.

Figure 2-19: Wiring Relays Using 24VAC/DC Pilot Relays for Typical Setup

2.5.2.5 TRIACSThe NB-VAVta and -VAVtf controllers have five (5) triac outputs at TB3 terminals 11 and 12 (both markedK1 on the PCB), 13 and 14 (both marked K2 on the PCB), 15 and 16 (both marked K3 on the PCB), 17 and18 (both marked K4 on the PCB), and 19 and 20 (both marked K5 on the PCB). Each triac output iscapable of tracking the amount of time that the output is considered to be engaged (runtime hours). Referto Figure 2-17 for wiring information. For additional information about triacs, refer to Section 1, Overview.

CAUTIONTriacs will switch a 1A, 24VDC load, but theywill not turn off until the load power isremoved.



Figure 2-20: Wiring Triacs Using 24VAC Pilot Relays for Typical Setup

2.5.2.6 WIRING THE ANALOG OUTPUTThe NB-VAV analog output provides a 0–10VDC output signal. AOs are normally controlled by the analogcontrol PID loop. However, they can also be manually controlled. Connection to the AOs are made at TB5.

Figure 2-21: NB-VAV Analog Output Wired for a 0–10VDC Output Device

0–10VDCdevice*

+-

Terminal 3

*MAXIMUM LOAD: 500Ω @ 10VDC

Terminal 4



2.5.3 SBC-STATFigure 2-7 illustrates wiring of the SBC-STAT Sensor Bus (SSB) on the SBC-STAT3 to the NB-VAV throughthe SSB and COM terminals on TB5.

Figure 2-8 illustrates the optional network wiring of the SBC-STAT to the NB-VAV through the N+ and N-terminals on TB2. For more information on network wiring, see the Network Kit Installation Guide.

Figure 2-22: SBC-STAT Bus Wiring

Figure 2-23: SBC-STAT Network Wiring to NB-VAV

SSB

COM

AO1

COM

200' Total Twisted Pair Wire

SSB/

COM

SSB/

COM

TB5

shield

shieldshield

Wiring to the

next device

The last shield should be tied back

and free from any connection

NB Controller

SBC-STAT Base

SSB/

COM

SSB/

COM

SBC-STAT Base

N-

N+

SBC-STAT Base SBC-STAT Base

N- N-N+ N+

shieldshield

Controller

Shielded Twisted Pair Wire

W iring to the

next device

The shield can be grounded to a

terminal box enclosure at one end

only.

Red

Black Yellow

Green

Wiring to next device

shield



When using digital thermostats—SBC-STAT1-D, SBC-STAT2-D, and SBC-STAT3—two or more NB-VAVscan be wired onto the same Sensor Bus. For this wiring structure to work properly, one NB-VAV must beset up as a Master (BM=0), and all other NB-VAVs must be set up as Slaves (BM=1). Up to four digitalSBC-STATs are allowed on a Sensor Bus.

Figure 2-24: Multiple NB-VAVs on a Sensor Bus

NOTEWhen connecting two or more NB-VAVs tothe same STATbus, polarity must bemaintained at all connections. Make sure toconnect COM to COM and SSB to SSB ateach device.

SSB

COM

AO1

COM

SSB

COM

AO1

COM

200' Total Twisted Pair Wire

SSB/

COM

SSB/

COMSSB/

COM

SSB/

COM

TB5

shield

shield

shield

Master NB Controller

SSB/

COM

SSB/

COMSSB/

COM

SSB/

COM

TB5

shield

shield

Slave NB Controller

The last shield should be cut and tied backand free from any connection

SBC-STAT1-D, SBC-STAT2-D or SBC-STAT3

SBC-STAT1-D, SBC-STAT2-D or SBC-STAT3



2.5.4 OPTIONAL ACTUATOR WIRINGOptional actuators can be either AC- or DC-powered. See Figure 2-25 for wiring an AC actuator.

Figure 2-25: AC Actuator Wiring

When connecting a DC-powered actuator, connect the actuators wires to pins 4 (Actuator -) and 5(Actuator +) on the NB-VAV(r/t/a/f) J2 connector. See Figure 2-26 for more information.

K1

K1

K2

K2

K3

K3

K4

K4

K5

K5

AC IN

AC OUT

NEUT

AC Actuator

CCW

CWCOM

TB3

TB4



Figure 2-26: DC Actuator Wiring

If connecting a feedback POT to an optional actuator, connect the POT wires to pins 1, 2 and 3 on the NB-VAV(r/t/a/f) J2 connector. For wiring information, see Figure 2-27.

Figure 2-27: DC Actuator Potentiometer Wiring

1. Feedback ground2. Feedback wiper3. Feedback +4. Actuator -5. Actuator +

connects to a dc actuator

1 2 3 4 5

+

-

2 wires connected to pins4 and 5

J2 Connector

1. Feedback ground2. Feedback wiper3. Feedback +4. Actuator -5. Actuator +

connects to a dc actuator

J2 Connector

1 2 3 4 5

+

-

5 wire connection to pins1-5


IN THIS SECTIONIntroduction.................................................................................................................................................................. 3-3Objects/Properties ....................................................................................................................................................... 3-4 Device..................................................................................................................................................................... 3-4 Zone Temperature ................................................................................................................................................ 3-13 Universal Inputs 1-3 (AI01, AI02, AI03) ................................................................................................................ 3-26 Flow Control ......................................................................................................................................................... 3-33 Supply Temperature ............................................................................................................................................. 3-41 Analog Output (AO01) .......................................................................................................................................... 3-44 Heat and Cool Setpoints (Analog Values) ............................................................................................................ 3-47 Binary Outputs (BO01-BO05) ............................................................................................................................... 3-50 Schedule............................................................................................................................................................... 3-55 Holiday Calendar .................................................................................................................................................. 3-58 Flow Setpoints ...................................................................................................................................................... 3-59 Electric Reheat ..................................................................................................................................................... 3-63 Valve Ctrl 1-2 ........................................................................................................................................................ 3-66 Analog Control ...................................................................................................................................................... 3-71 Occupancy Detector ............................................................................................................................................. 3-78 Proof of Flow ........................................................................................................................................................ 3-80 Broadcast Schedule ............................................................................................................................................. 3-82

SECTION 3: NB-VAV PROPERTIES

This section introduces you to the groupings of properties used to control the parameters of theSBC applications over the BACnet MS/TP network. Detailed descriptions of all points for thecontroller appear here. Information on common usage of the properties is also included.



3.1 INTRODUCTIONAll properties appear in boldface to facilitate locating descriptions of a particular property in the documenttext.

For a listing of each property along with the associated channel, see Appendix A: MS/TP Objects andProperties.

DEVICE SECTION 3: NB-VAV PROPERTIES


3.2 OBJECTS/PROPERTIES

3.2.1 DEVICE

The functions of the Device Object Properties are similar to the PUP System attributes. The BACnetproperties listed adhere to the BACnet standard and are necessary for the NB-VAV to talk BACnet. Theproprietary properties allow the NB-VAV to remain consistent with the PUP version of the controller. Seethe below property descriptions for more information on the Device Object.

3.2.1.1 STANDARD BACNET DEVICE OBJECT PROPERTIESProperty object_identifier is the Device Object Identifier. This is a unique numeric code used to identifythe object. For AAM objects, this will be “Device (8), Instance” followed by the serial number.

Property object_name is the Object Name. This is a unique name within the BACnet device thatmaintains it. For AAM objects, this will be “AAM VAV” followed by the serial number. This property is read-only.

Property object_type is the Object Type. Indicates the object type class. This property is read-only.

Property system_status is the System Status. This property indicates the current status of the BACnetDevice. This property is read-only. The values that may be taken on by this property are:

0=OPERATIONAL 1=OPERATIONAL_READ_ONLY 2=DOWNLOAD_REQUIRED 3=DOWNLOAD_IN_PROGRESS 4=NON_OPERATIONAL 5=BACKUP_IN_PROGRESS

Property vendor_name is the Vendor Name. This property lists the manufacturer of the BACnet Device.All AAM devices will read “American Auto-Matrix”.

Property vendor_identifier is the Vendor ID. This ID is unique for each vendor and is assigned byASHRAE. The AAM vendor ID number is 6.

Property model_name is Model Name. Each manufacturer assigns a model name of the BACnet Device.For this controller, the model name is “NB-VAV”.

NOTEThe Device Object appears as follows in theObject Name window in NB-Pro:

AAM VAV xxxxxxxxxx (xxxxxxxxxx is the serialnumber of the AAM VAV Unitary Controller).

SECTION 3: NB-VAV PROPERTIES DEVICE


Property firmware_revision is the Firmware Revision. This indicates which firmware revision code iscurrently installed in the BACnet device. This is a read only property.

Property application_software_version is the Application Software Version. This property, of typeCharacterString, identifies the version of application software installed in the machine. The content of thisstring is a local matter, but it could be a date-and-time stamp, a programmer's name, a host file versionnumber, etc.

Property protocol_version is the Protocol Version. This is the version of BACnet that is supported by thespecific BACnet device. The present version number of the BACnet protocol is one (1).

Property protocol_revision indicates the minor revision level of the BACnet standard supported by thespecific BACnet device.

Property protocol_services_supported is Protocol Services Supported. If the device supportsstandardized protocol services other than the Protocol Conformance Class, it will be indicated in thisproperty. This device supports the following services: getAlarmSummary readProperty writeProperty deviceCommunicationControl reinitalizeDevice i-Am i-Have unconfirmedPrivateTransfer timeSynchronization who-Has who-Is.

Property protocol_object_type_supported is Protocol Object Types Supported. If the device supportsstandard or non-standard object types other than those in the protocol conformance class, they will beindicated in this property. This device supports the following object types: Analog Input Analog Output Analog Value Binary Output Calendar Device Schedule

Property object_list is the Object List (BACnetARRAY). This property is a list of object_identifiers. Thereis one object_identifier for each object within the device.

Property maximum_apdu_length_accepted is the Maximum Application Layer Protocol Data Unit(APDU) Size. This is a maximum number of octets that can be contained in a single application layerprotocol data unit. The value is read-only and defaults to 50.

Property segmentation_support is Segmentation Support. This property indicates whether or not theBACnet device supports segmentation of messages. This property is read-only.



Property local_time is the Time. This property indicates the time of day. The time can be set through theTime Synchronization service. If you are using a Real-time Clock module, the NB-VAV will maintain thecurrent time upon power failure.

Property local_date is the Date. This indicates the current date. The date can be set through the TimeSynchronization service. If you are using a Real-time Clock module, the NB-VAV will maintain the currentdate upon power failure.

Property apdu_segment_timeout is APDU Segment Timeout. This indicates the amount of time, inmilliseconds, between retransmissions of an APDU segment. The default is 300 milliseconds. This valueshall be non-zero if the Device object property Number_Of_APDU_Retries is non-zero.

In order to achieve reliable communication, it is recommended that the values of theAPDU_Segment_Timeout properties of the Device objects of all intercommunicating devices shouldcontain the same value.

Property apdu_timeout is APDU Timeout. This property indicates the amount of time, in milliseconds,between retransmission of an APDU. The default is 300 milliseconds.

Property number_of_APDU_retries is APDU Retries. This property allows you to enter the maximumnumber of times an APDU should be retransmitted after a timeout. The default is 1. If you do not want toperform retries, set this property to 0.

Property time_synchronization_recipients is Time Synchronization Recipients. This is a list of devicesthat should receive Time Sync requests. If there are no recipients in the list, a Time Sync is not sent out.

Property max_master, of type Unsigned, is active when a device is a master node on an MS/TP network.The default value of this property is 127.

Property max_info_frames is used if the device is a node on the MS/TP network. It specifies themaximum number of information frames the node may send before it must pass the token. This propertydefaults to 4.

Property device_address_binding is Device ID Bind Address List. This is the device address that is usedwhen the device is accessed by a BACnet service request.

Property database_revision is a logical revision number for the device's database. It is incremented whenan object is created, an object is deleted, an object's name is changed, or a restore is performed.

3.2.1.2 PROPRIETARY DEVICE OBJECT PROPERTIESProperty BU is Backup Control. It forces the backup of the properties TF, TE, AE, and Digital Outputs 1-5RH to EEPROM. The NB-VAV copies these values to EEPROM at midnight each day. However you mayforce a copy at any time by setting BU to 1. The property returns to 0 when the backup is complete. AAMrecommends that you perform a backup any time that a maintenance power down is planned or any timethat the Electric Reheat property RO changes. Properties affected by BU or the automatic RAM backupfeature of the NB-VAV are as follows:

the run time values of Digital Output 1 RH through Digital Output 5 RH the accumulated extended time property value Digital Input AE the analog input total accumulated flow value of the Analog Input TF and the accumulated energy

value of the Analog Input property TE



the staged values (which are invisible to the user) set when Electric Reheat RO is modified.

Property CC is Clock Fail Count. This counter increments upon hardware failure but can also be advancedduring the removal of power.

Property CM is the Manufacturer of the device. For American Auto-Matrix products, the number is 255.This property is read-only. It is useful when host systems are connected to networks with unitarycontrollers from different manufacturers. Flash updates are rejected if CM is not 255.

Property CP Network Baud Rate. It specifies the communication speed (baud rate) at which devices on thenetwork will communicate. All devices on the network must have the same communication speed. Validbaud rates are as follows: 0=9600, 6=38.4K, 7=19.2K, and 9=57.6K. This attribute defaults to 6.

Property CT is the Controller Type. This point identifies the type of device. An NB-VAV is type 202. Thisproperty is read-only, and its value is established at the American Auto-Matrix factory. Flash updates forthe NB-VAV are rejected if CT is not 202.

Property DE is Default Enable. This property restores configuration settings to factory defaults. To set thedefaults, enter a value of 197. It may take several seconds to complete the reset. Note that this will notalter the unit ID or selected communications baud rate.

Property EM is Engineering Units. It specifies the type of engineering units (U.S./English or Metric) to beused for temperatures. If EM is set to zero, degrees are specified in Fahrenheit. If EM is set to 1, degreesare specified in Celsius. A change in this property automatically converts setpoints to the appropriate units.The display mode for digital thermostats also changes but can be set separately. English (EM=0) is thedefault setting.

Property FT is Firmware Type. It defines the class of firmware operating system used in this controller. Thisproperty is read-only.

Property IC is EEPROM Default Count. This counter increments whenever the EEPROM is restored tofactory default settings (see System property DE Default Enable).

Property ID is the Unit Number. This value is used to set a unique network address for each controllerconnected on a multi-drop. Each ID is factory set to the last two digits of the board serial number. Validvalues are 0 to 127. For example, if the serial number is 100072, the Unit ID is 72. If the serial number is498765, the Unit ID is 65. When changing the ID manually, master devices can be set to any valuebetween 0 and 127, and slave devices can be set to any value between 128 and 254.

NOTEIf the value of EM changes, make sure anyproperties set prior to the change arerecalculated and reprogrammed to reflectthe EM type chosen. Then reset the NB-VAV. Failure to correct these entries willresult in display and calculating errors.



Property MS is Master/Slave mode. This attribute is used to configure the controller as a master node(passes token) or a slave node. Selections are as follows: 0=slave, 1=master.

Property OC is Illegal Opcode Count. This counter increments upon firmware failure but can also beadvanced during the removal of power.

Property OS is Kernel Version. It defines the class of firmware operating system used in this controller.This property is read-only.

Property PD is Power-on Delay. It determines how long, in seconds (0–255), an NB-VAV waits beforeenergizing its outputs after a power loss or soft reset. During this time, all output control and alarmfunctions stop after cycling of power or NB-VAV reset. This property defaults to a value of 5. Any setting ≤2 seconds will receive a value of 2 seconds.

Property PS is Power-Up State. It determines which schedule state the NB-VAV uses after a power lossand before its time is synchronized. The selections are as follows: unoccupied=0, warm-up=1,occupied=2, and night setback=3. The default for this property is 2.

Property RC is Power-up Count. This counter increments each time power is applied to the controller. Thiscounts power outages and noise related resets as well as resets initiated through System property RS.

Property RS is Reset of the NB-VAV. This point allows a host or operator to reset the controller. You canreset by giving RS a value of 1, after which RS returns to 0 (the default).

Property SN is Serial Number. It displays the Serial Number of the NB-VAV controller. This property isread-only.

Property SR is the Software Time Stamp. This point uniquely defines each flash firmware image. Thenumerically higher the firmware image, the more recent it is. AAM recommends that all controllers beupdated periodically to use the latest available firmware. This property is read-only.

Property UP is Flash Update Count. This counter increments each time a new flash firmware image isaccepted by the controller.

Property VE is the Software Version. It indicates the version number of the active firmware. This propertyis read-only.

Property WC is Count of Watchdog COP. This counter increments upon firmware failure but can also beadvanced during the removal of power.

Property ZN Zone Number. The Zone Number (from 0 to 65,535) is used to group controllers together sothat they can be controlled simultaneously. For example, you can set a group of controllers to enter Warm-up Mode all at the same time. The Zone Number programs a Zone Address. This attribute defaults to 0.

Property ZP is Count of High Current Pulses. This counter advances when Motor ManagementTechnology (MMT) takes action to maintain the operation of the actuator. When several counts are talliedover a period of a few days, the actuator is reaching its end of life. Low level count activity is normal.



Table 3-1 Device Properties

Type Property Description

Standard BACnet Properties

object_identifierDevice Object Identifier—unique numeric code used to identify the object. Defaults to “Device(8), Instance” followed by the serial number.

object_nameObject Name—a unique name within the BACnet device that maintains it. Defaults to “AAM VAV” followed by the serial number.

object_type Object Type—indicates the object type class.Defaults to “Device(8)”.

system_status

System Status—indicates the current status of the BACnet Device.

0=OPERATIONAL1=OPERATIONAL_READ_ONLY2=DOWNLOAD_REQUIRED3=DOWNLOAD_IN_PROGRESS4=NON_OPERATIONAL5=BACKUP_IN_PROGRESS

vendor_nameVendor Name—lists the manufacturer of the BACnet Device.Factory set to “American Auto-Matrix”.

vendor_idVendor ID—this ID is unique for each vendor and is assigned by ASHRAE.Default value is 6.

model_nameModel Name—each manufacturer assigns a model name of the BACnet Device.Factory set to “NB-VAV”.

firmware_revision Firmware Revision—indicates which firmware revision code is currently installed in the BACnet device.

application_software_version

App Software Version—version of application software installed in the machine.

protocol_version Protocol Version—version of BACnet that is supported by the specific BACnet device.

protocol_revision

Protocol Revision—indicates the minor revision level of the BACnet standard.

protocol_services_supported

Protocol Services Supported—if the device supports standardized protocol services other than the Protocol Conformance Class, it will be indicated in this property.



protocol_object_type_supported

Object Types Supported—if the device supports standard or non-standard object types other than those in the protocol conformance class, they will be indicated in this property.

object_list Object List—a list of object_identifiers. There is one object_identifier for each object within the device.

maximum_apdu_length

Max APDU Size—maximum number of octets that can be contained in a single application layer protocol data unit. The value must be greater than or equal to 50.

segmentation_supported

Segmentation Support—indicates whether or not the BACnet device supports segmentation of messages.

local_time Time—indicates the time of day.

local_date Date—indicates the current date.

apdu_segment_timeout

APDU Segment Timeout—indicates the amount of time, in milliseconds, between retransmissions of an APDU segment. The default is 300 milliseconds.

apdu_timeoutAPDU Timeout—indicates the amount of time, in milliseconds, between retransmission of an APDU. The default is 300 milliseconds.

number_of_APDU_retries

APDU Retries—allows you to enter the maximum number of times an APDU should be retransmitted. The default is 1. To not perform retries, set to 0.

time_synchronization_

recipients

Time Sync Recipients—a list of devices that should receive Time Sync requests. If there are no recipients in the list, a Time Sync is not sent out.

max_master

Max Master—is active when a device is a master node on an MS/TP network. The value of this property should be the highest possible address for master nodes and must be less than or equal to 127.

max_info_frames

Max Info Frame—used if the device is a node on the MS/TP network. It specifies the maximum number of information frames the mode may send before it must pass the token.

device_address_binding

Device ID Bind Address List—the device address that is used when the device is accessed by a BACnet service request.





database_revision

Database Revision—a logical revision number for the device's database. It is incremented when an object is created, an object is deleted, an object's name is changed, or a restore is performed.

Proprietary Device Properties

BUBackup RAM Values—backs up TF, TE, the digital input property AE and digital outputs 1-5 RH to EEPROM each day at midnight. To copy them at any other time, set BU=1.

CC Clock Fail Count—increments upon hardware failure but can also be advanced during the removal of power.

CM Manufacturer—(read-only) is the manufacturer of the device. AAM devices are 255.

CP

Network Baud Rate—specifies the communication speed (baud rate) at which devices on the network will communicate. All devices on the network must have the same communication speed. Valid baud rates are as follows: 0=9600, 6=38.4K, 7=19.2K, 8=115.2K, and 9=57.6K. This attribute defaults to 6.

CTController Type—(read-only) factory-set controller type identifies the type of unitary controller. CT for the NB-VAV is 202.

DE Default Enable—restores configuration settings to factory defaults. Enter 197 to set the defaults.

EM

Engineering Units—specifies which units of measurement to use in returning temperature values. 0=English Units1=Metric Units

FT Firmware Type—defines the class of firmware operating system used in this controller.

IC EEPROM Default Count—increments whenever the EEPROM is restored to factory default settings.

ID

Unit Number—used to set a unique network address for each controller connected on a multi-drop. Each ID is factory set to the last two digits of the board serial number. Valid values are 0 to 127. For example, if the serial number is 100072, the Unit ID is 72. If the serial number is 498765, the Unit ID is 65. When changing the ID manually, master devices can be set to any value between 0 and 127, and slave devices can be set to any value between 128 and 254.





MSMaster/Slave mode—used to configure the controller as a master node (passes token) or a slave node. Selections are as follows: 0=slave, 1=master.

OC Illegal Opcode Count—increments upon firmware failure but can also be advanced during the removal of power.

OS Kernel Version—this read-only property defines the class of firmware operating system used in the controller.

PDPower-up Delay—determines how long (0-255 seconds) an NB-VAV waits before energizing its outputs after power loss or soft reset. PD defaults to 5 seconds.

PS

Power-up State—determines which schedule state to use after a power loss and before time sync.0=unoccupied1=warm-up2=occupied (default)3=night setback

RC Power-up Count—increments each time power is applied to the controller.

RS Reset the NB-VAV—allows a host or operator to reset the controller by setting RS=1.

SN Serial Number—displays the serial number of the NB-VAV controller.

SRSoftware Time Stamp—(read-only) uniquely defines each flash firmware image. The numerically higher the firmware image, the more recent it is.

UP Flash Update Count—increments each time a new flash firmware image is accepted by the controller.

VE Firmware Version—(read-only) contains the version number of the active firmware.

WC Watchdog Count—increments upon firmware failure but can also be advanced during the removal of power.

ZP

MMT Pulse Count—advances when MMT takes action to maintain the operation of the actuator. The activity on this count should be low. If it is high, the actuator is reaching the end of its life.



SECTION 3: NB-VAV PROPERTIES ZONE TEMPERATURE


3.2.2 ZONE TEMPERATURE3.2.2.1 STANDARD BACNET ZONE TEMPERATURE PROPERTIESProperty object_identifier is a unique numeric code that is used to identify the object. Theobject_identifier defaults to “Analog Input (0), Instance 0”.

Property object_name is a unique name used to represent an object within the BACnet device. The namemust be at least one character in length and it must consist of printable characters. The object_name isfactory set to “Zone Temperature”. This property is read-only.

Property object_type indicates which object type class the property belongs to. In this case, Object_Typeis Analog Input. The default object_type is “0”.

Property present_value indicates the current value of the input being measured. It is represented inengineering units.

Property status_flags uses four flags to indicate the state of the analog input. The four flags listed beloware represented by the last four bits of the 32-character bit map in the SAGEMAX Area Controller. End-users should ignore all characters except for the last four. The staus_flags are:

In_Alarm Fault Overridden Out_Of_Service

Property event_state determines whether or not the object has an active event state associated with it.As per the specification, event_state will always return ”Normal” when the controller is operating normally.

Property out_of_service can be set to True or False. If it is True, the present_value will not trackchanges to the physical input. Also, when this property is true, the present_value can be changed to createspecific conditions for testing purposes. The default value for out_of_service is “0”.

Property units indicates the measurement units of this object.

Property high_limit is a limit by which the present_value must exceed before an event is generated.

Property low_limit is a limit by which the present_value must fall below before an event is generated.

Property deadband is a range between the high_limit and low_limit property by which thepresent_value must remain for a return-to-normal event to be generated.

3.2.2.2 PROPRIETARY ZONE TEMPERATURE PROPERTIESProperty AE is Alarm Enable. It specifies the type of alarm checking to be done on the present_value. Avalue of 0 indicates that alarming is disabled; a nonzero number indicates one of several alarm functions.Table 3-2 defines alarm options for AE.

To demonstrate how limit alarming operates, let’s assume that high_limit=80.5°F and alarming is enabledfor high limit alarming (AE=5). Then let’s assume that the zone temperature changes from 72.0°F to83.0°F because someone opened an outside door in the summertime. A high limit alarm is generatedbecause 83.0°F > high_limit. This also causes the alarm status property (AS) to equal 6 (high limit alarm).Once the zone temperature drops below high_limit and the offset defined by the deadband, the alarmstate returns to normal (AS=0).

ZONE TEMPERATURE SECTION 3: NB-VAV PROPERTIES


Property AS is Alarm Status. It shows the current alarm condition. A value of 0 indicates a normalcondition; a nonzero number indicates alarm generation. Table 3-3 explains the status for each value.

Property BM is SSB Mode. BM should be set to Master (BM=0) unless multiple controllers are wired ontoa single Sensor Bus (SSB). All additional controllers on the SSB must be configured as Slaves (BM=1).Masters control and communicate with digital thermostats. Slaves receive their information from theMaster. Slaves receive information from the following master Zone Temperature properties:present_value, User Setpoint Offset (TS), User Adjust Remaining (TR), and Extended OccupancyRemaining (ER).

Property BT is Application (Box Type). Settings are none (BT=0), cooling only (BT=1), heating only(BT=2), supply dependant (BT=3), and cooling with reheat (BT=4). The supply dependent setting requiressource/duct air temperature and automatically selects cooling and heating modes as required. The defaultvalue for BT=1.

Property CC is Current Cooling Setpoint. It shows the current cooling temperature control setpoint. Thiswill depend on setbacks and user adjustments. The property is read-only. CC has a default value of 72.0.

Property CH is Current Heating Setpoint. It shows the current heating temperature control setpoint. Thiswill depend on setbacks and user adjustments. The point is read-only. CH has a default value of 68.0.

Property DF is Thermostat Display Format. This property defines the format used to display the currenttemperature on the digital thermostat. The display of the tenths digit and the Fahrenheit/Celsius characterare options. Also, the display may be eliminated. The options for DF are given in Table 3-4.

Table 3-2: AE Alarm Enable Options

Value of AE Alarm Type Enabled

AE=0 disabled

AE=4 low limit alarm

AE=5 high limit alarm

AE=6 low and high limit

Table 3-3: AS Values for Alarm Status

Value of AS Alarm Condition

AS=0 normal (no alarm)

AS=5 low limit alarm

AS=6 high limit alarm



Property DL is Demand Load. It indicates the heating/cooling demand in terms of temperature separationfrom setpoints. A cooling demand will be indicated by a negative value and a heating demand by a positivevalue. If the zone is satisfied, then the Demand Load will be 0.

Property DM is Demand Mode. It indicates the demand for the zone. A satisfied zone will indicate “vent”(DM=0). If the NB-VAV is in cooling mode and the zone temperature exceeds the cooling setpoint, “cool” isindicated (DM=1). If the controller is in heating mode and the zone temperature falls below the heatingsetpoint, “heat” is indicated (DM=2).

Property DS is Thermostat Display Mode. It specifies whether English or Metric units are to be used fordigital thermostat display on the SBC-STAT3. This mode is automatically altered as appropriate when thesystem Engineering Units property is set but may be modified later if required to display the alternate units.For DS=0, the temperature will be displayed in degrees Fahrenheit (the default). If DS is set to 1, degreesCelsius will be used instead.

Property DV is Thermostat Display Value. By default (DV=0) each digital thermostat will display theidentical temperature value, which is the average of each. With DV=1 each thermostat will display its owntemperature (including offset).

Property ED is Extended Occupancy Duration. It specifies the amount of time in minutes to extendoccupancy. The default value of ED=60.

Property ER is Extended Occupancy Remaining. It shows the amount of time remaining in extendedoccupancy. This value is set to the Extended Occupancy Duration (ED) when either push-button on ananalog or digital thermostat is pressed. The SBC-STAT3 digital thermostat employs its User Menu for thisfunction. The point ER is a read-only property that cannot be changed directly.

Table 3-4: DF Values for Thermostat Display Format

Value of AS Thermostat Display Format

DF=0 (Default) ##o

DF=1 ##.#o

DF=2 ##oF (or C)

DF=3 ##.#oF (or C)

DF=4 No Temp Display

NOTEProperties ED and ER will override thepower-up default schedule mode.



Property ET is Enable Totalization. When set to 1, the totalized flow and totalized energy are calculated. Ifyou enable this point, you MUST make sure that present_value in the Supply Temperature object is aduct temperature value. Energy totalization is invalid in any other circumstance. Therefore unless thepresent_value in the Supply Temperature object is a reliable duct temperature sensor, ET should remaindisabled (ET=0).

Property G0 is GID Device 0. The Global Identification for the Sensor Bus device.

Property G1 is GID Device 1 The Global Identification for the Sensor Bus device.



Property OA is Extended Occupancy Accumulation.

Property OF is Temperature Adjustment. It defines an optional correction that may be required as anadjustment for the thermostat location and the possible measurement errors.

Property PB is Balancer P.I.N. This Personal Identification Number controls access to the Balance Menu.A value of 0 makes the menu always accessible. Values inclusively from 0001 to 9999 are used to controlaccess to the menu. A matching number must be entered by the Balancer. Values of 10,000 or greater willhide the menu. Entered P.I.N. numbers remain valid for only four (4) minutes after their use. The defaultvalue of PB is 2200.

Property PG is Primary GID. It specifies the GID of the Primary SBC-STAT in Primary GID mode ReadingMode (RM=8). If this SBC-STAT is not available then the Average temperature mode (RM=0) is used.

Property PI is Installer P.I.N. This Personal Identification Number controls access to all menus. A value of0 makes the menu always accessible. Values inclusively from 0001 to 9999 are used to control access. Amatching number must be entered by the Installer. Values of 10,000 or greater will hide the Install Menu.An authenticated Installer can access all menus. Entered P.I.N.s remain valid for only four (4) minutes afterthe last button press. PI defaults to a value of 3300.

Property PS is Service P.I.N. This Personal Identification Number controls access to the Service Menu. Avalue of 0 makes the menu always accessible. Values inclusively from 0001 to 9999 are used to controlaccess to the menu. A matching number must be entered by the Servicer. Values of 10,000 or greater willhide the menu. Entered P.I.N.s remain valid for only four (4) minutes after their use. PS has a default valueof 1100.

Property PU is User P.I.N. This Personal Identification Number controls access to the User Menu. A valueof 0 makes the menu always accessible. Values from 0001 to 9999 inclusive are used to control access tothe menu. A matching number must be entered by the User. Values of 10,000 or greater will hide themenu. Entered P.I.N.s remain valid for only four (4) minutes after their use. PU has a default value of 0.

Property RM is Reading Mode. This property specifies the technique used to determine Zone Temperaturewhen multiple SBC-STATs are used. The default is Average mode (RM=0). Highest (RM=1) and Lowest(RM=2) modes set the Zone Temperature appropriately. The Hi/Lo VST mode (RM=3) selects either thehighest or lowest temperature depending on the supply mode. The highest temperature is used in coolingmodes. The lowest temperature in heating modes.



A specific SBC-STAT may be selected by device position 0-3 (RM=4-7). Note that while the SBC-STATsappear in device positions consistently, the order may change when SBC-STATs are added, removed, orreplaced. To specify a unique SBC-STAT by its GID, select the Primary GID mode (RM=8).

When a single SBC-STAT is present, its temperature is used even if RM has a different setting. If aspecified SBC-STAT is absent, the Average mode (RM=0) is used.

Property RT is Reset accumulations. When set to 1, this point will establish zero values in the totalaccumulated flow and total accumulated energy properties. This property returns to 0 when reset iscomplete.

Property SD is Calculated Setpoint Display. It specifies the method of setpoint display shown on an SBC-STAT3 LCD when a user changes the zone setpoint. A value of 0 will display the current offset (e.g. +/-2.5). A value of 1 will display the Zone Midpoint (Property ZS). A value of 2 will display the HeatingSetpoint (Property CH). A value of 3 will display the Cooling Setpoint (Property CC)

Property SE is Override Disabled/Enabled. This property enables (SE=1) or disables (SE=0) the user'sability to enter extended occupancy override. SE defaults to 1.

Property SU is Alarm Setup/Setback Value. It specifies the amount added to HL or subtracted from LLduring unoccupied periods. This property effectively shifts the points at which alarms and alarm returns aregenerated. SU has a default value of 0.0.

Property T0 is Reading Device 0. Up to 4 digital thermostats may be used on a single Sensor Bus. Thisproperty reflects the raw (without offset) reading for Device 0.




Property TE is Total Accumulated Energy. It shows the total amount of accumulated energy in BTUs orkilojoules used by the terminal box. The NB-VAV multiplies the flow CA by the absolute value of thedifference between the duct temperature and zone temperature and a constant to produce a value thatreflects the amount of energy used by the zone. For correct calculation of accumulated energy, ET MUSTbe enabled and present_value of the Supply Temperature object MUST be a reliable duct temperaturevalue. The NB-VAV calculates the value of this attribute once every minute.



Attribute TF is Total Flow (cooling duct). It shows the total amount of accumulated cooling duct flow incubic feet or liters. This is a measurement of how much air has passed through the duct since the last timeTF was set to zero. For correct calculation of accumulated flow, ET MUST be enabled and present_valueof the Supply Temperature object MUST be a reliable duct temperature value. This attribute is read only.However you can set it to 0 by making RT=1.

Property TM is Offset Increment. It specifies the magnitude of incremental changes to the User SetpointOffset (TS). The User Adjust Position (TP) is multiplied by TM to determine the User Setpoint Offset (TS)value. If the User Adjust Increment is 0, you will not be able to alter the setpoint.

Property TP is User Adjust Position. The User Setpoint Offset (TS) can be raised or lowered in integralsteps. This property tracks the current step. It can be set to any signed integer but will be constrained to +/−2 when adjusted by an analog thermostat or to +/−5 when set through a digital thermostat. The point isused in combination with the User Adjust Increment (TM) to calculate the User Setpoint Offset.

Property TR is User Adjust Remaining. It displays the time remaining before the User Setpoint Offset (TS)setting is reset.

During scheduled unoccupied periods, control loop setpoints and analog input alarm limits may be set upor set back to create a wider control range or deadband in the interest of conserving energy. Theoccupancy override feature of the NB-VAV allows the control loop setpoints and analog input alarm limitsto use their normal, nonsetup, nonsetback, occupied mode values through the SBC-STAT overridefeature. For more information, see the SBC-STAT User Manual.

During a scheduled unoccupied mode, you can manually override the scheduled state to occupied modethrough the SBC-STAT; the setpoints are no longer set up or set back. The Override feature puts theselected schedules into a temporary occupied mode.

Property TS is Setpoint Offset. It defines an offset for application to PID setpoints. This point shows thecurrent value calculated when you multiply the User Adjust Position (TM) by the User Adjust Increment(TP). This setting is temporary and is valid only for the User Adjust Duration (TT) minutes unless TT=0.

NOTEBoth TE and TF are useful for keeping trackof supply air flow and supply airtemperature, which are important insubmetering applications. These attributesare backed up into EEPROM once per dayor every time that the system backup RAMvalue (BU) is manually changed to 1.



Property TT is User Adjust Duration. The User Setpoint Offset (TS) is a temporary setting. The TT propertydefines, in minutes, the duration for which the setting applies. After that time, the User Adjust Position andUser Adjust Offset are reset to 0 degrees. If the User Adjust Duration is 0, then setpoint changes remain ineffect until modified. TT has a default value of 120.

Property ZS is Zone Midpoint. It displays the midpoint between the current cooling and heating setpoints.This property reflects changes in both setpoints. A change in ZS results in the appropriate shift of both thecooling and heating setpoint maintaining the effective deadband.

The CC and CH points include a plus or minus offset in the calculation to account for setup and setbackwhen the NB-VAV is in a scheduled unoccupied or night setback mode of operation. The value of TS willbe a positive or a negative integer based on the value of TP.

NOTEYou cannot set property TS with the SBC-STAT1.

CAUTIONCare must be taken to ensure that terminalbox operations are not adversely affectedduring use of the NB-VAV’s powerful receivebroadcast features. Selection of the correctinput is a must. Unitary controllerprogrammers should be absolutely sure thatthe actions chosen in the system are exactlywhat is needed for optimal operation of theNB-VAV.

Table 3-5 Zone Temperature Properties



object_identifier

Analog Input Object Identifier—Property object_identifier is Analog Input Object Identifier. This property is a unique numeric code that is used to identify the object. The default object_identifier is “Analog input (0), Instance 0”,



object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. The default object_name is “Zone Temperature”

object_typeObject Type—indicates which object type class the property belongs to. In this case, object_type is Analog Input (0).

present_value Present Value—indicates the current value of the input being measured. It is represented in engineering units.

status_flags

Status Flags—uses four flags to indicate the state of the analog input. The four flags are: In_Alarm Fault Overridden Out_Of_Service

event_state Event State—determines whether or not the object has an active event state associated with it.

out_of_service

Out of Service—when this property is True, the present_value will not track changes to the physical input. Also, when this property is true, the present_value can be changed to create specific conditions for testing purposes. This property defaults to 0 (False).

units Engr Units—indicates the measurement units of this object.

high_limitHigh Alarm Limit—a limit by which the present_value must exceed before an event is generated. The default High Alarm Limit is 0.0.

low_limitLow Alarm Limit—a limit by which the present_value must fall below before an event is generated. The default Low Alarm Limit is 0.0.

deadbandAlarm Limit Hysteresis—a range between the high_limit and low_limit property by which the present_value must remain for a return-to-normal event to be generated.

Proprietary Zone Temperature Properties

AE

Enable Alarming—specifies the type of alarm checking to be done on the CV value. 0=Disabled (Default)4=Low limit alarm5=High limit alarm6=low and high limit alarm





AS

Alarm Status—shows the current alarm condition. A value of 0 indicates a normal condition; a nonzero number indicates alarm generation.0=No alarm (Default)5=Low limit alarm6=high limit alarm

BM

SSB Bus Mode—by default this should be set to Master (BM=0) unless multiple controllers are wired onto a single Sensor Bus (SSB). All additional controllers on the SSB must be configured as Slaves (BM=1).

BT

Application (Box Type)—none (BT=0), cooling only (BT=1), heating only (BT=2), supply dependant (BT=3), and cooling w/reheat (BT=4). BT defaults to cooling only (BT=1).

CCCurrent cooling setpoint—shows the current cooling temperature control setpoint. This will depend on setbacks and user adjustments. The attribute is read-only.

CHCurrent heating setpoint—shows the current heating temperature control setpoint. this will depend on setbacks and user adjustments. The point is read-only.

DF

Thermostat display format—defines the format used to display the current temperature on the digital thermostat. The display of the tenths digit and the Fahrenheit/Celsius character are options. Also, the display may be eliminated.0=##° (Default)1=##.#°2=##°F (or C)3=##.#°F (or C)4=No Temp Display

DLTotal zone demand load—indicates the heating/cooling demand for the zone in terms of temperature separation from setpoints.

DM

Demand mode cool/heat/vent—indicates the demand for the zone. A satisfied zone will indicate “vent” (DM=0). If the NB-VAV is in cooling mode and the zone temperature exceeds the cooling setpoint, “cool” is indicated (DM=1). If the controller is in heating mode and the zone temperature falls below the heating setpoint, “heat” is indicated (DM=2).





DS

Thermostat display mode—specifies whether English or Metric units are to be used for digital thermostat display on the SBC-STAT3. This mode is automatically altered as appropriate when the system Engineering Units property is set but may be modified later if required to display the alternate units.0=Fahrenheit (Default)1=Celsius

DV

Thermostat display value—by default (DV=0) each digital thermostat will display the identical temperature value (ZT) which is the average of each. With DV=1, each thermostat will display its own temperature (including offset).

EDExtended occupancy time—specifies the amount of time in minutes to extend occupancy. ED has a default value of 60.

ER

Extended occupancy remaining—shows the amount of time remaining in extended occupancy. This value is set to the Extended Occupancy Duration (ET) when either push button on an analog thermostat is pressed. The SBC-STAT3 digital thermostat employs its User Menu for this function. ER is a read-only property that cannot be changed directly.

ET

Enable totalization—when set to 1, this calculates totalized flow and totalized energy. If you enable this point, you must make sure that ST is a duct temperature value. Energy totalization is invalid in any other circumstance. Therefore unless ST is used as a duct temperature sensor, ET should remain disabled (ET=0).

G0-G3 Global ID for device—the Global Identification for the Sensor Bus device.

OA

Extended Occupancy Accumulation—shows the total amount of time that the NB-VAV has spent in extended occupancy (override during scheduled unoccupied periods). You can clear this value by setting OA to 0.

OFTemperature adjustment—defines an optional correction that may be required as an adjustment for the thermostat location and the possible measurement errors.





PB

Balance P.I.N.—this Personal Identification Number controls access to the Balance Menu. A value of 0 makes the menu always accessible. Values inclusively from 1 to 9,999 are used to control access to the menu. A matching number must be entered by the Balancer. Values of 10,000 or greater will hide the menu. Entered P.I.N. numbers remain valid for only four (4) minutes after their use. PB has a default value of 2200.

PG

Primary GID—specifies the GID of the Primary thermostat in Primary GID mode (RM=8). If this thermostat is not available, then the Average temperature mode (RM=0) is used.

PI

Installer P.I.N.—this Personal Identification Number controls access to all menus. A value of 0 makes the menu always accessible. Values inclusively from 1 to 9,999 are used to control access. A matching number must be entered by the Installer. Values of 10,000 or greater will hide the Install Menu. An authenticated Installer can access all menus. Entered P.I.N.s remain valid for only four minutes after the last button press. PI has a default value of 3300.

PS

Service P.I.N.—this Personal Identification Number controls access to the Service Menu. A value of 0 makes the menu always accessible. Values inclusively from 1 to 9,999 are used to control access to the menu. A matching number must be entered by the Servicer. Values of 10,000 or greater will hide the menu. Entered P.I.N.s remain valid for only four (4) minutes after their use. PS has a default value of 1100.

PU

User P.I.N.—this Personal Identification Number controls access to the User Menu. A value of 0 makes the menu always accessible. Values from 0001 to 9999 inclusive are used to control access to the menu. A matching number must be entered by the User. Values of 10,000 or greater will hide the menu. Entered P.I.N.s remain valid for only four (4) minutes after their use. PU has a default value of 0.





RM

Reading Mode—indicates the current reading mode. This would be either Cooling or Heating as specifies by the system box type (BT). If BT is set to supply dependant, the point will indicate the current mode as determined by the source/duct temperature.0=Average1=Highest2=Lowest3=Hi/Lo VST mode4=Device 05=Device 16=Device 27=Device 38=Primary GID

RT

Reset accumulations—when set to 1, this point will establish zero values in the total accumulated flow and total accumulated energy properties. This property returns to 0 when reset is complete.

SD

Calculated Setpoint Display—specifies what method is used to display setpoint adjustments on an SBC-STAT3 LCD screen.0 = Disable (+/-2.5)1 = Zone Midpoint (Zone Temperature: (ZS) Zone Midpoint)2 = Heating Setpoint (Zone Temperature: (CH) Heating Setpoint)3 - Cooling Setpoint (Zone Temperature: (CC) Cooling Setpoint)

SE

Override disabled/enabled—enables or disables the user's ability to enter extended occupancy override. 0=Disabled1=Enabled (Default)

SUAlarm Setup/Setback—specifies the amount added to HL or subtracted from LL during unoccupied periods. SU has a default value of 0.0.

T0-T3Thermostat Reading—Up to four digital thermostats may be used on a single Sensor Bus. This property reflects the raw (without offset) reading for Devices 0-3.

TE Total energy—shows the total amount of accumulated energy (in BTUs or kilojoules) used by the terminal box.





TF

Total flow—shows the total amount of accumulated cooling duct flow in cubic feet or liters. this is a measurement of how much air has passed through the duct since the last time TF was set to zero. For correct calculation of accumulated flow, ET must be enabled and ST must be a duct temperature value. This attribute is read only, however, you can set it to 0 by making RT=1.

TM

Offset increment—specifies the magnitude of incremental changes to the User Setpoint Offset (TS). The User Adjust Position (TP) is multiplied by TM to determine the User Setpoint Offset (TS) value. If the User Adjust Increment is 0, you will not be able to alter the setpoint.

TP

User adjust position—the User Setpoint Offset (TS) can be raised or lowered in integral steps. This property tracks the current step. It can be set to any signed integer but will be constrained to +/−2 when adjusted by an analog thermostat or to +/−5 when set through a digital thermostat. The point is used in combination with the User Adjust Increment (TM) to calculate the User Setpoint Offset.

TR User adjust remaining—displays the time remaining before the User Setpoint Offset (TS) setting is reset.

TS

Setpoint offset—defines an offset for application to PID setpoints. This point shows the current value calculated when you multiply the User Adjust Position (TM) by the User Adjust Increment (TP). This setting is temporary and is valid only for TT minutes unless TT=0.

TT

User adjust duration—the User Setpoint Offset (TS) is a temporary setting. The TT property defines in minutes the duration for which the setting applies. After that time, the User Adjust Position and User Adjust Offset are reset to 0 degrees. If the User Adjust Duration is 0, then setpoint changes remain in effect until modified. The default value for TT is 120.

ZS

Zone Midpoint—displays the midpoint between the current cooling and heating setpoints. This property reflects changes in both setpoints. A change in ZS results in the appropriate shift of both the cooling and heating setpoint maintaining the effective deadband.



UNIVERSAL INPUTS 1-3 (AI01, AI02, AI03) SECTION 3: NB-VAV PROPERTIES


3.2.3 UNIVERSAL INPUTS 1-3 (AI01, AI02, AI03)3.2.3.1 STANDARD BACNET UNIVERSAL INPUT PROPERTIESProperty object_identifier is the Analog Input Object Identifier. This property is a unique numeric codethat is used to identify the object. The default object_identifier is “Analog Input (0), Instance X” where Xis the Input number.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default object_name is “UI0X” where X is the Input number. This property is read only.

Property object_type is Object Type. This indicates which object type class the property belongs to. In thiscase, object_type is Analog Input, object_type=0.

Property present_value is Present Value. This property indicates the current value of the input beingmeasured. It is represented in engineering units.

Property status_flags is Status Flags. This property uses four flags to indicate the state of the analoginput. The four flags are:

In_Alarm Fault Overridden Out_Of_Service.

Property event_state is the Event State. This property determines whether or not the object has an activeevent state associated with it. As per the specification, event_state will always return ”Normal” when thecontroller is operating normally.

Property reliability is Reliability. This property gives the reliability of the present value or operation. Thedifferent results are:

1=No_Fault_Detected 2=No_Sensor 3=Over_Range 4=Under_Range 5=Open_Loop 6=Shorted_Loop 7=Unreliable_Other

Property out_of_service is Out of Service. When this property is True, the present_value will not trackchanges to the physical input. Also, when this property is true, the present_value can be changed tocreate specific conditions for testing purposes. The out_of_service property has a default value of 0.

Property units is Engineering Units. It indicates the measurement units used by the object. Theunits property defaults to no units, units=95.

Property min_pres_value is Minimum Scaled Value. This property is the lowest number that can bereliably obtained for the Present Value of the object. min_pres_value has a default value of 0.0.

Property max_pres_value is Maximum Scaled Value. This is the highest number that can be reliablyobtained for the Present Value of the object. max_pres_value has a default value of 0.0.

SECTION 3: NB-VAV PROPERTIES UNIVERSAL INPUTS 1-3 (AI01, AI02, AI03)


Property high_limit is High Alarm Limit. This is a limit by which the present_value must exceed before anevent is generated. high_limit has a default value of 0.0.

Property low_limit is Low Alarm Limit. This is a limit by which the present_value must fall below before anevent is generated. low_limit has a default value of 0.0.

Property deadband is the range between the high_limit and low_limit property by which thepresent_value must remain for a return-to-normal event to be generated. deadband has a default valueof 0.0.

3.2.3.2 PROPRIETARY UNIVERSAL INPUT PROPERTIESProperty AE is Alarm Enable. It specifies the type of alarm checking to be done on the present_value. Avalue of 0 indicates that alarming is disabled; a nonzero value selects one of several alarm functions.Table 3-6 lists the options for AE.

Property AS is Alarm Status. It shows the current alarm condition. A value of 0 indicates a normalcondition. A nonzero number indicates alarm generation. Table 3-7 explains each status.

Table 3-6: Alarm Enable Options


AE=0(default) disabled

AE=1contact, 0→1

AE=2contact, 1→0

AE=3change of state, 1↔0




Table 3-7: Values for Alarm Status Property


AS=0(default)

normal (no alarm)

AS=1 contact (0 → 1)



Property DT is Data Type. It specifies the data type for the input. The data type determines how certain UIproperties are displayed. This point affects the display of present_value, min_pres_value,max_pres_value, SU, low_limit, high_limit, and deadband. Data type codes determine the number ofdecimal places in the value and whether or not the value is signed (positive or negative) or unsigned. Thisproperty defaults to 253 (signed 9.1 digit).

Property IF is Input Filtering. It specifies the amount of time, in tenths of seconds, during which an inputconfigured as digital must remain stable in order for the value to be considered reliable if fluctuations arenot uncommon. This is also the weighted gain if the input is configured as analog. This property is used inthe following equation to calculate the average value:

Property IF for digital inputs is determined by the amount of time that the input is in the most recent changeof state. The properties resolution for digital inputs is user adjustable in tenths of seconds. The default fordigital and analog input filtering is 0.0.

Property IP is Input Polarity. It specifies the input polarity when configured as digital. A value of 0 in IPindicates that a low voltage displays as present_value=0, a high voltage displays as present_value=1,and a closed contact=0. A value of 1 in IP indicates that a low voltage displays as present_value=1, ahigh voltage displays as present_value=0, and a closed contact=1. The default value for IP is 0.

Property OF is Temperature Adjustment. It defines an optional correction that may be required as anadjustment for the thermostat location and the possible measurement errors. The default value for OF is0.0.

Property ST is Sensor Type. Through this point, you can select one of the following input types: digital,linear (scaled min_pres_value to max_pres_value), 4–20mA linear (scaled min_pres_value tomax_pres_value) or thermistor table 1 (−22.0 to 122.0°F). The associated settings appear in Table 3-8.

AS=2 contact (1 → 0)

AS=3 change of state



Table 3-8: Sensor Types

Value of ST Sensor Type

ST=0 digital



Average Value= (Old Value × IF) + New Value IF + 1



When ST=0, the universal input will be configured to operate as a digital input and will allowpresent_value to display a 1 or a 0—the meaning of which is dependent on IP (input polarity). If IP=0, alow voltage input (<2.5VDC) to the universal input will result in present_value=0; a high voltage(>2.5VDC) applied to the universal input will result in present_value=1. If IP=1, a low voltage applied tothe universal input will read as present_value=1; a high voltage will result in present_value=0. Setting STto 2 and having the NB-VAV set up to use the appropriate hardware input provides the ability to use a 0–10VAC device as the input. The minimum and maximum values of the range are set in propertiesmin_pres_value and max_pres_value. For example if the input value is to be displayed as a percentage,then set ST=2, min_pres_value=0 and max_pres_value=0 (0–100%). The NB-VAV will determine thevoltage input converted internally to raw counts, will scale the raw counts across the range 0–100 and willdisplay the value of the input as a range of 0–100. For linear voltage devices, be sure that the appropriatejumper and resistor on the PC board are properly set. For more information, see Section 2: Wiring andInstallation.

The following sample calculation shown below indicates how the NB-VAV scales raw counts on the 15-bitUI1 using a current value of 115. (The result is rounded.)

The NB-VAV also provides linear input scaling for 4–20mA current transmitters (ST=3). For sensors thatprovide a 4–20mA signal, set ST=3. Properties min_pres_value and max_pres_value are used in thesame way as they are for ST=2. By default, ST=7.

Property SU is the Setback Value. It specifies the amount added to HL or subtracted from LL duringunoccupied periods. The property is added to HL defining the unoccupied high-limit alarm threshold; SU issubtracted from LL defining the unoccupied low-limit alarm threshold. SU has a default value of 0.0.

ST=2

full scale, linear input scaled from min_pres_value to max_pres_value (0–10VDC or 0–20mA)

ST=3 4–20mA input scaled from MN to MX

ST=7 Thermistor (default)

Table 3-8: Sensor Types

Value of ST Sensor Type



Table 3-9 Universal Input Properties



object_identifiera unique numeric code that is used to identify the object.Default value is “Analog Input (0), Instance X” where X is the input number.

object_name

a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default values is “UI0X” where X is the input number.

object_type indicates which object type class the property belongs to. In this case, object_type is Analog Input. Default value is 0.

present_value indicates the current value of the input being measured. It is represented in engineering units.

status_flags

one of the following four flags indicate the state of the analog input: In_Alarm Fault Overridden Out_Of_Service.

event_state determines whether or not the object has an active event state associated with it.

present_value=max_present_value + Current Counts × MX Max Counts

CV=0.00 + 115 × 100 32,767

CV=0.00 + 11500 32,767

CV=0.35



reliability

gives the reliability of the present value or operation. The different results are:

1=No_Fault_Detected2=No_Sensor3=Over_Range4=Under_Range5=Open_Loop6=Shorted_Loop7=Unreliable_Other.

out_of_service

When this property is True, the present_value will not track changes to the physical input. Also, when this property is true, the present_value can be changed to create specific conditions for testing purposes. Default value is 0.

units indicates the measurement units used by the object. Default value is no units (95).

min_pres_value the lowest number that can be reliably obtained for the present_value of the object. Default value is 0.0.

max_pres_value the highest number that can be reliably obtained for the present_value of the object.Default value is 0.0.

high_limit the limit by which the present_value must exceed before an event is generated. Default value is 0.0.

low_limit limit by which the present_value must fall below before an event is generated. Default value is 0.0.

deadbandthe range between the high_limit and low_limit property by which the present_value must remain for a return-to-normal event to be generated. Default value is 0.0.

Proprietary Universal Input Properties

AE

Alarm Enable—specifies the type of alarm checking to be done on the present_value. 0=Disabled (Default)1=Contact (0→1)2=Contact (1→0)3=Contact (1↔0)4=Low limit5=High limit6=Low/high limit





AS

Alarm Status—shows the current alarm condition.0=No alarm1=Contact (0→1)2=Contact (1→0)3=Change of state4=Unused5=Low limit6=High limit

DTData Type—specifies the data type for the input. The data type determines how certain universal input properties are displayed. Default value is 253.

IF

Input Filter Delay—specifies the amount of time, in tenths of seconds, during which an input configured as digital must remain stable in order for the value to be considered reliable. Default value is 0.0.

IP

Input Polarity—specifies the input polarity when configured as digital. A value of 0 in IP indicates that a low voltage displays as present_value=0, a high voltage displays as present_value=1, and a closed contact=0. A value of 1 in IP indicates that a low voltage displays as present_value=1, a high voltage displays as present_value=0, and a closed contact=1. Default value is 0.

OFTemperature Adjustment—defines an optional correction that may be required as an adjustment for the thermostat location and the possible measurement errors.

ST

Sensor Type—through this point, you can select one of the following input types: 0= digital2= full scale, linear 0-10V dc or 0-20mA scaled from MN to MX3= 4–20mA liner scaled from MN to MX 7= Thermistor (Default)

SUAmount to Setup/Setback Alarm Limit—specifies the amount added to High_Limit or subtracted from Low_Limit during unoccupied periods.



SECTION 3: NB-VAV PROPERTIES FLOW CONTROL


3.2.4 FLOW CONTROL3.2.4.1 STANDARD BACNET FLOW CONTROL PROPERTIESProperty object_identifier is Analog Input Object Identifier. This property is a unique numeric code that isused to identify the object. The default value for object_identifier is “Analog Input (0), Instance 6”.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters.The default value for object_name is “Flow Control”. This property is read only.

Property object_type is Object Type. This indicates which object type class the property belongs to. In thiscase, object_type is Analog Input (0).





Property out_of_service is Out of Service. When this property is True, the present_value will not trackchanges to the physical input. Also, when this property is true, the present_value can be changed to createspecific conditions for testing purposes. The default value for out_of_service is 0.

Property units is Engineering Units. This property indicates the measurement units used by this object.The default value for units is cubic feet per minute (84).

Property high_limit is High Alarm Limit. This is a limit by which the present_value must exceed before anevent is generated. The default value for high_limit is 0.

Property low_limit is Low Alarm Limit. This is a limit by which the present_value must fall below before anevent is generated. The default value for low_limit is 0.

Property deadband is the range between the high_limit and low_limit property by which thepresent_value must remain for a return-to-normal event to be generated. The default value fordeadband is 0.

3.2.4.2 PROPRIETARY FLOW CONTROL PROPERTIESProperty AC is Auto/Manual/Track Mode Select. When this property is set for Auto (AC=1), the TargetFlow (CD) is determined by the control algorithms and setpoints. In SSB Slave Mode and set for Tracking(AC=2), the Target Flow will “track” the average flow of the Master. Select Manual (AC=0) to override theTarget Flow. The default value for AC is 1. See Page 3.9 for more information on Bus Master (BM).

Property AE is Enable Alarming. This specifies the type of alarm checking to be done on thepresent_value. The default value for AE is 0.

FLOW CONTROL SECTION 3: NB-VAV PROPERTIES


Property AS is Alarm Status. This property shows the current alarm condition.

Property AT is Actuator Type. This property defines the type and connection for the damper actuator. A/CActuators will use the option relay outputs of K4 and K5. DC actuators will use the standard actuatorconnection. Motor Management Technology (MMT) supports the Belimo LM-24M actuator. Settings forthis property are as follows:

0=LM-24M (MMT) (Default)1=Generic DC2=Generic AC (k4-5)3=None

Property CA is Average Flow. This shows the measured average flow in cfm.

Property CB is Calibrate Flow Sensor. It allows a host or operator to manually calibrate the flow sensor(Zero Offset) based on the complete absence of airflow once the unit is installed in the field. Calibrationoccurs when you completely shut down the air supply and set CB = 1. Once the NB-VAV runs through itscalculations and adjusts for zero air flow, CB automatically resets itself to 0.

Property CD is Target Flow. This shows the desired flow (cfm) setpoint calculated by the cooling or heatingPI loops.

Property CK is Duct Scaling Factor (K). It shows the scaling factor for the particular VAV box being used.An initial scaling factor may be calculated as 4,005 times the effective area of the duct in square feet. Thedefault is 786 (for a 6" round duct). This scaling factor may be automatically calculated using 1-PointCalibration (KC).

Table 3-10: Alarm Enable Options


AE=0 disabled






AS=0 normal (no alarm)





Property DC is Damper Control Mode. It defines the method used to control the damper. For PressureDependant mode (DC=0) the damper position is estimated based on the target flow (CD) and theestimated maximum flow (EF). In Measured Flow mode (DC=1, the default) the damper is modulated tomaintain the target flow (CD). DC=2 will set the controller to operate in a Dual Mixed (CAV) mode.

Property DD is Damper Direction. It is used to set the direction of the damper motor. When the DD=0 (thedefault), the motor turns in the normal direction. With DD=1, the motor turns in the opposite direction.

Property DM is Damper Mode. This property can be used to command the damper to fully open or tooperate at minimum or maximum cooling, heating, and warm-up setpoints. Settings for DM are describedin Table 3-12:

Property DP is Damper Position. This property shows the damper position with an optional actuator havinga built-in feedback potentiometer. (NB-VAVrf and NB-VAVtf only)

Property DS is Damper Status. This attribute reports the status of the actuator as determined by the MMT.Possible values are: 0=Ready, 1=Disconnected/Open, and 2=Jammed/Shorted. Diagnostic alarms andreturns are issued when this status changes.

Property EF is Estimated Flow at Full Open. It shows the estimated flow at full open in cfm. This attribute isused when the damper control attribute is set to Pressure Dependant (DC=0).

Property EP is Estimated Target Damper Position. This shows the estimated target position with which theloop should control the valve to bring the measured input variable closer to the setpoint. EP can take anyvalue from 1-100%.

Property FC is Fan Status/Control. This property controls the current status of the fan output. 0=Off, 1=On.

Property FH is the Flow Hysteresis in CFM. It specifies the maximum amount of flow sensor variation to betolerated by the NB-VAV before changing damper position. This point allows you to set a hysteresis, ordeadband, centered around the calculated air flow value. This hysteresis prevents bouncing of the air flow

Table 3-12: Settings for DM

Value of DM Damper Mode

DM=0 Automatic (Default)

DM=1 Full Open

DM=2 Min Cool

DM=3 Max Cool

DM=4 Min Heat

DM=5 Max Heat

DM=6 Min Warmup

DM=7 Max Warmup



value. Such bouncing is usually prevalent at the lower and higher ends of the air flow range, potentiallycreating situations in which the damper may be toggled because of controller response. Air flow values(CV) must be greater than or less than the upper and lower limits defined around CV by FH. Figure 3-1illustrates the boundaries set around CV when FH > 0. This attribute defaults to 20.

Property K2 is Measured CFM for 2-point Calibration. This property accepts a measured cfm value that isat least 100 CFM different than that last entered in KC. Both this measured cfm value and that entered inKC are then used to calibrate. This provides for an improved flow calibration.

Figure 3-1: Flow Hysteresis Around CV When FH > 0

Property KC is Measured CFM for CK adjust. When you enter the externally measured cfm value, this willautomatically adjust the Duct Scaling Factor (CK) based the present flow reading to properly scale theduct.Note that this does not perform the function if 0 is entered or if CV is overridden.

Property OF is Flow Offset. It defines an offset or adjustment applied to the target flow. When operated inAuto (AC=1) or Tracking (AC=2) mode, the Flow Offset is added to the derived target. The Target Flow(CD) includes this offset.

Property RZ is Rejuvenate Count. When MMT detects the possibility of an actuator short, electrical pulsesare used in an attempt to rejuvenate the motor.

Property SU is Alarm Limit Setup/Setback. It specifies, in CFM, the amount added to high_limit orsubtracted from low_limit during unoccupied periods. Figure 3-2 illustrates the effect of SU duringunoccupied mode.

Deadband(No Control Action)

CV

CV - FH CV + FH

Control Control

air flow(CFM or

lps)



Figure 3-2: Unoccupied Setup/Setback Alarm Shifting

Table 3-13 Flow Control Properties



object_identifierAnalog Input Object Identifier—a unique numeric code that is used to identify the object. Default value is “Analog Input (0), Instance 6”.

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “Flow Control”

object_typeObject Type—indicates which object type class the property belongs to. In this case, object_type is Analog Input. Default value is 0.


status_flags

Status Flags—uses four flags to indicate the state of the analog input. The four flags are: In_Alarm Fault Overridden Out_Of_Service.


High-limitAlarm

Low-limitAlarm

High-limitReturn

Low-limitReturn

LL-SU(unocc. low limit)

HS (unocc. hysteresis)

LL (occ. low limit)

HS (occ. hysteresis)

HS (occ. hysteresis)

HL (occ. high limit)

HS (unocc. hysteresis)

HL+SU (unocc. high limit)

CV



out_of_service

Out of Service—when this property is True, the present_value will not track changes to the physical input. Also, when this property is true, the present_value can be changed to create specific conditions for testing purposes. Default value is 0.

unitsEngineering Units—indicates the measurement units used by this object. Default value is cubic feet per minute (84).

high_limitHigh Alarm Limit—a limit by which the present_value must exceed before an event is generated. Default value is 0.0.

low_limitLow Alarm Limit—a limit by which the present_value must fall below before an event is generated. Default value is 0.0.

deadband

Alarm Limit Hysteresis—a range between the high_limit and low_limit property by which the present_value must remain for a return-to-normal event to be generated. Default value is 0.0.

Proprietary Flow Control Properties

AC

Auto/manual mode select—when this property is set for Auto, the Target Flow (CD) is determined by the control algorithms and setpoints.0=Manual1=Auto (Default)2=Tracking

AE

Enable Alarming—specifies the type of alarm checking to be done on the present_value.0=disabled (Default)4=low limit5=high limit6=Low/High Limit

AS

Alarm Status—shows the current alarm condition.0=No Alarm5=low limit6=high limit





AT

Actuator type—defines the type and connection for the damper actuator. A/C Actuators will use the option relay outputs of K4 and K5. D/C actuators will use the standard actuator connection. Motor Management Technology (MMT) supports the Belimo LM-24M actuator.

Choices:0 = LM-24M (MMT) (Default)1 = Generic D/C2 = Generic A/C3 = None

CA Average flow—shows the measured average flow in cfm.

CB Calibrate flow—allows a host or operator to manually calibrate the flow sensor.

CD Target flow—shows the desired flow (cfm) setpoint calculated by the cooling or heating PI loops.

CK Duct scaling factor (K)—shows the scaling factor for the particular VAV box being used.

DC

Damper control mode—defines the method used to control the damper. For Pressure Dependant mode (DC=0) the damper position is estimated based on the target flow (CD) and the estimated maximum flow (EF). In Measured Flow mode (DC=1 default) the damper is modulated to maintain the target flow (CD). DC=2 sets the controller to operate in a Dual Mixed CAV mode.

DD

Damper direction—use this property to set the direction of the damper motor.0=normal (Default)1=reverse

DM

Damper Mode—can be used to command the damper to fully open or to operate at minimum or maximum cooling, heating, and warm-up setpoints.0=automatic (Default)1=open fully2=cooling minimum flow3=cooling maximum flow4=heating minimum flow5=heating maximum flow 6=warm-up minimum flow7=warm-up maximum flow

DP Damper position—shows the damper position with an optional actuator having a built in feedback potentiometer.





DS

Damper status—This attribute reports the status of the actuator as determined by the MMT.

0=Ready1=Disconnected/Open2=Jammed/Shorted.

Diagnostic alarms and returns are issued when this status changes.

EF Estimated flow at full open—shows the estimated flow at full open in cfm.

EP

Estimated target damper position—shows the estimated target position, measured from 0-100%, with which the loop should control the valve to bring the measured input variable closer to the setpoint.

FC

Fan status/control—controls the current status of the fan output.0=Off1=On

FHFlow hysteresis—specifies the maximum amount of flow, measured in CFM, sensor variation to be tolerated by the NB-VAV before changing damper position.

K2

Measured CFM for 2pt cal—accepts a measured cfm value that is at least 100 cfm different than that last entered in KC. Both this measured cfm value and that entered in KC are then used to calibrate. This provides for an improved flow calibration.

KC

Measured CFM for CK adjust—when you enter the cfm value measured externally, this will automatically adjust the Duct Scaling Factor (CK) based the present flow reading to properly scale the duct.

OF

Flow Offset—defines an offset or adjustment applied to the target flow. When operated in Auto (AC=1) or Tracking (AC=2) mode, the Flow Offset is added to the derived target. The Target Flow (CD) includes this offset.

RZRejuvenate count—when MMT detects the possibility of an actuator short, electrical pulses are used in an attempt to rejuvenate the motor.

SUAlarm setback—specifies the type of alarm checking to be performed on the present_value. Default value is 0 CFM.



SECTION 3: NB-VAV PROPERTIES SUPPLY TEMPERATURE


3.2.5 SUPPLY TEMPERATURE3.2.5.1 STANDARD BACNET SUPPLY TEMPERATURE OBJECTSProperty object_identifier is Analog Input Object Identifier. This property is a unique numeric code that isused to identify the object. The default value for object_identifier is “Analog Input (0), Instance 8”.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default value for object_name is “Supply Temperature”. This property is read only.

Property object_type is Object Type. This indicates which object type class the property belongs to. In thiscase, object_type is Analog Input (0).





Property reliability is Reliability. This property gives the reliability of the present value or operation. Thedifferent results are: 1=No_Fault_Detected 2=No_Sensor 3=Over_Range 4=Under_Range 5=Open_Loop 6=Shorted_Loop 7=Unreliable_Other

Property out_of_service is Out of Service. When this property is True, the present_value will not trackchanges to the physical input. Also, when this property is true, the present_value can be changed to createspecific conditions for testing purposes. The default value for out_of_service is 0.

Property units is Engineering Units. These are the measurement units of the object. The default value forunits is degrees Fahrenheit (64).

3.2.5.2 PROPRIETARY SUPPLY TEMPERATURE PROPERTIESProperty DD is Auto Duct Delta Temperature. This defines the temperature difference by which the supplyair must either exceed the CH heating setpoint for a switch to heating mode or must fall below the CCcooling setpoint to engage cooling mode. The default value for DD is 2.5.

Property IC is the Input Channel. It specifies the input to be used to monitor supply temperature. If IC=1,UI1 will be used. If, IC=2, UI2 will be used.

SUPPLY TEMPERATURE SECTION 3: NB-VAV PROPERTIES


Property OF is Supply/Duct Temperature Adjustment. It defines an offset used to adjust present_value.

Property SM is Cooling/Heating Supply Mode. It indicates the current supply mode. This would be eitherCooling (SM=0) or Heating (SM=1) as specified by the System Box Type (BT). If BT is set to supplydependant, the point will indicate the current mode as determined by the source/duct temperature.

Table 3-14 Supply Temperature Properties



object_identifierAnalog Input Object Identifier—a unique numeric code that is used to identify the object. Default value is “Analog Input (0), Instance 8”.

object_name

Object Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “Supply Temperature”.

object_typeObject Type—indicates which object type class the property belongs to. In this case, object_type is Analog Input (0).


status_flags



reliability

Reliability—gives the reliability of the present_value or operation. The different results are:

1=No_Fault_Detected2=No_Sensor3=Over_Range4=Under_Range5=Open_Loop6=Shorted_Loop7=Unreliable_Other

out_of_service


units Engineering Units—measurement units of the object.

SECTION 3: NB-VAV PROPERTIES SUPPLY TEMPERATURE


DD

Auto Duct Delta Temperature—defines the temperature difference by which the supply air must either exceed the CH heating setpoint for a switch to heating mode or must fall below the CC cooling setpoint to engage cooling mode.

IC

Input Channel Select—specifies the input to be used for the measured variable for the control loop.1=UI1 (Default)2=UI2

OF Supply/Duct Temperature Adjustment—defines an offset used to adjust CV.

SM

Cooling/Heating Supply Mode—indicates the current supply mode. This would be either Cooling or Heating as specified by the System Box Type (BT). If BT is set to supply dependant, the point will indicate the current mode as determined by the source/duct temperature. 0=Cooling1=Heating

Table 3-14 Supply Temperature Properties


ANALOG OUTPUT (AO01) SECTION 3: NB-VAV PROPERTIES


3.2.6 ANALOG OUTPUT (AO01)3.2.6.1 STANDARD BACNET ANALOG OUTPUT PROPERTIESProperty object_identifier is a unique numeric code that is used to identify the object. The default valuefor object_identifier is “Analog Output (1), Instance 1”

Property object_name is a unique name used to represent an object within the BACnet device. The namemust be at least one character in length and it must consist of printable characters. The default value forobject_name is “AO01”.

Property object_type indicates which object type class the property belongs to. In this case, object_typeis Analog Output (1).

Property present_value indicates the current value of the input being measured. It is represented inengineering units.

Property status_flags uses four flags to indicate the state of the analog input. The four flags are:


Property event_state determines whether or not the object has an active event state associated with it.As per the specification, event_state will always return ”Normal” when the controller is operating normally.

Property out_of_service is Out of Service. When this property is True, the present_value will not trackchanges to the physical input. Also, when this property is true, the present_value can be changed tocreate specific conditions for testing purposes. The default value for out_of_service is 1.

Property units indicates the measurement units of this object. The default value for units is no units (95).

Property min_pres_value specifies the minimum scaled value for the analog output corresponding to thelowest value output. This point is used to scale the measured value to meaningful engineering units fordisplay. The default value for min_pres_value is 0.0.

Property max_pres_value specifies the maximum scaled value for the analog output corresponding to thehighest value output. This point is used to scale the measured value to meaningful engineering units fordisplay.The default value for max_pres_value is 100.0.

Property priority_array is a read-only array of prioritized values.

Property relinquish_default is a value to be used as the Present Value when all values in the priorityarray are NULL.

3.2.6.2 PROPRIETARY ANALOG OUTPUT PROPERTIESProperty DT is Data Type. It specifies the data type for the analog output. The data type determines howcertain analog output properties are displayed. This point affects the display of present_value,min_pres_value and max_pres_value. The property defaults to 252 (unsigned, 9.1 digit).

Property LS is Minimum Scaled Voltage. It specifies the actual analog output value for a present_valuevalue of min_pres_value. The default value for LS is 0.0.

SECTION 3: NB-VAV PROPERTIES ANALOG OUTPUT (AO01)


Property HS is Maximum Scaled Voltage. It specifies the actual analog output value for a present_valuevalue of max_pres_value. The default value for HS is 100.0.

Table 3-15 Analog Output Properties



object_identifierAnalog Value Object—a unique numeric code that is used to identify the object. Default value is “Analog Output (1), Instance 1”.

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “AO01”.

object_type Object Type—indicates which object type class the property belongs to. Default value is “Analog Output (1)”.

present_value Present Value—indicates the current value of the input being measured.

status_flags

Status Flags—uses four flags to indicate the state of the analog input. The four flags are:



out_of_service


units Units—indicates the measurement units of this object. Default value is no units (95).

min_pres_valueMinimum Scaled Value—lowest number that can be reliably obtained for the present_value of the object. Default value is 0.0.

max_pres_value Maximum Scaled Value—highest number that can be reliably obtained. Default value is 100.0.

priority_array Property is Priority Array— This is a list array of prioritized values.

relinquish_defaultRelinquish Default—a value to be used as the present_value when all values in the priority array are NULL.

ANALOG OUTPUT (AO01) SECTION 3: NB-VAV PROPERTIES


Proprietary Properties DT

Data type for Output—specifies the PUP data type for the analog output. The data type determines how certain analog output properties are displayed. This point affects the display of present_value, min_pres_value and max_pres_value. The property defaults to 252 (unsigned, 9.1 digit).

LSMinimum Scaled Voltage—specifies the actual analog output value for a present_value value of min_pres_value. Default value is 0.0.

HSMaximum Scaled Voltage—specifies the actual analog output value for a present_value value of max_pres_value. Default value is 100.0.

Table 3-15 Analog Output Properties


SECTION 3: NB-VAV PROPERTIES HEAT AND COOL SETPOINTS (ANALOG VALUES)


3.2.7 HEAT AND COOL SETPOINTS (ANALOG VALUES)There are seven Analog Values Objects as follows: Cool Setpoint - Instance 1 Cool Unoccupied Setup/Setback - Instance 2 Cool Night Setup/Setback - Instance 3 Heat Setpoint - Instance 4 Heat Unoccupied Setup/Setback - Instance 5 Heat Night Setup/Setback - Instance 6 Warmup Setpoint - Instance 7

3.2.7.1 ANALOG VALUES STANDARD PROPERTIESProperty object_identifier is Analog Value Object Identifier. This property is a unique numeric code that isused to identify the object. The default value for object_identifier is “Analog Value (2), Instance X” whereX is the instance number listed above.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. These properties are read only. The default values for object_name appear in Table 3-16:

Property object_type is Object Type. This indicates which object type class the property belongs to. In thiscase, object_type is Analog Value. The default value for object_type is “Analog Value (2)”.

Property present_value is Present Value. This property specifies the value for the setpoint associatedwith the object.


In_Alarm

Table 3-16: Instance Names

Instance # object_name

1 Cool Setpoint

2 Cool Unoccupied Setup/Setback

3 Cool Night Setup/Setback

4 Heat Setpoint

5 Heat Unoccupied Setup/Setback

6 Heat Night Setup/Setback

7 Warmup Setpoint

HEAT AND COOL SETPOINTS (ANALOG VALUES) SECTION 3: NB-VAV PROPERTIES


Fault Overridden Out_Of_Service.


Property out_of_service is Out of Service. When this property is True, the present_value will not trackchanges to the physical input. Also, when this property is true, the present_value can be changed tocreate specific conditions for testing purposes. The default Value for out_of_service is 0.

Property units in Engineering Units. This property indicates the measurement units of this object. Thedefault value for units is “Degrees-Fahrenheit”.

3.2.7.2 PROPRIETARY ANALOG VALUES SETPOINTSThere are no AAM Proprietary properties for the Cooling and Heating Setpoint Objects.

Table 3-17 Heat and Cool Setpoints Properties



object_identifier

Analog Value Object—a unique numeric code that is used to identify the object. Default value is “Analog Value (2), Instance X” where X is

Cool Setpoint X=1Cool Unoccupied Setup/Setback X=2Cool Night Setup/Setback X=3Heat Setpoint X= 4Heat Unoccupied Setup/Setback X=5Heat Night Setup/Setback X= 6Warmup Setpoint X= 7

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is:

Instance 1 = “Cool Setpoint” Instance 2 = “Cool Unoccupied Setpoint”Instance 3 = “Cool Night Setback”Instance 4 = “Heat Setpoint”Instance 5 = “Heat Unoccupied Setback”Instance 6 = “Heat Night Setback”Instance 7 = “Warmup Setpoint”

object_type Object Type—indicates which object type class the property belongs to. Default value is “Analog Value (2)”.

present_value Present Value—indicates the current value of the input being measured.

SECTION 3: NB-VAV PROPERTIES HEAT AND COOL SETPOINTS (ANALOG VALUES)


status_flags

Status Flags—uses four flags to indicate the state of the analog input. The four flags are:



out_of_service


units Units—indicates the measurement units of this object. Default value is “Degrees-Fahrenheit”.

Table 3-17 Heat and Cool Setpoints Properties


BINARY OUTPUTS (BO01-BO05) SECTION 3: NB-VAV PROPERTIES


3.2.8 BINARY OUTPUTS (BO01-BO05)3.2.8.1 STANDARD BACNET DIGITAL OUTPUTS (BO01-BO05) PROPERTIESProperty object_identifier is Binary Output Object Identifier. This property is a unique numeric code thatis used to identify the object. The default value for object_identifier is “Binary Output (4), Instance X”where X is 1-5 corresponding to BO01-BO05.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default value of object_name is “BO0X” where X is 1-5 corresponding to BO01-BO05. Property object_type is Object Type. This indicates which object type class the property belongs to. In thiscase, object_type is Binary Output. The default value of object_type is “Binary Output (4)”.





Property out_of_service is Out of Service. When this property is True, the present_value will not trackchanges to the physical input. Also, when this property is true, the present_value can be changed tocreate specific conditions for testing purposes. The default value for out_of_service is 1.

Property polarity is Output Polarity. This property is used to define whether the output is normal acting orreverse acting. As a normal acting output (polarity=0, the default value), the output is off when outputcontrol is not calling for the output to be on. As a reverse acting output (polarity=1), the output is off whenthe control loop is calling for the output to be on.

Property priority_array is a read-only array of prioritized values.

Property relinquish_default is a value to be used as the present_value when all values in the priorityarray are NULL.

3.2.8.2 PROPRIETARY FAN DIGITAL OUTPUT (BO01) PROPERTIESProperty FC is Minimum cycle time. It shows the minimum amount of time, in minutes (0.0 to 25.5), thatthe fan output will stay energized or de-energized. This prevents short cycling of the fan output. Thedefault value for FC is 2.0.

Property FO is Fan/Damper Application. This property defines the mode of the fan during the occupiedschedule state. The options for FO are given in Table 3-18:.

SECTION 3: NB-VAV PROPERTIES BINARY OUTPUTS (BO01-BO05)


Property FS is Fan Setpoint. It allows you to define the setpoint, in cubic feet per minute or liters of air flowas measured by the Flow Control object property CA, at which the fan or induction damper is enabled sothat it can assist the terminal box in maintaining the minimum air flow requirements.

Property RH is Run Hours. It is a time tracking property that displays hours and tenths of hours. The pointreflects the amount of time that the output is actually allowing the fan to run as determined by the propertypolarity and the control loop demand. Run hours are stored in EEPROM automatically at midnight andwhen the property BU is enabled. Property RH is restored with the latest backed up information uponrestoration of power after shut down or power loss. This property defaults to 0.

Property RL is Run Limit. It specifies a runtime limit in hours for the output. Once the run hours for the fanoutput exceed the runtime limit (RH > RL). The NB-VAV will generate a runtime limit alarm. To clear the runlimit alarm or to receive another run limit alarm, you must set RH to 0.

Property SF is Fan Mode. When a series fan box type is selected, SF defines how the series fan iscontrolled during unoccupied periods. If SF=0 (default value), the series fan is always on duringunoccupied periods.

When SF=1, the series fan control is based on the zone temperature. If zone temperature is within thedeadband created by the calculated heating and cooling control setpoints, then the series fan is shut off. Ifzone temperature extends above or below the deadband, the series fan is turned on.

Figure 3-3: Unoccupied Series Fan Operation With FO = 1 and SF = 1

3.2.8.3 DIGITAL OUTPUTS 2-5 (BO02-BO05)Property RH is Run Hours. It is a time tracking property that displays hours and tenths of hours. The pointreflects the amount of time that the output is actually allowing the fan to run as determined by the property

Table 3-18: Fan/Damper Applications

FO Application

0 No fan/induction damper

1 Series fan

2 Parallel fan

3 Induction damper

CCHC

SeriesFanOn

SeriesFanOn

Deadband(Series Fan Off)



polarity and present_value. Run hours are stored in EEPROM automatically at midnight and when theproperty BU is enabled. Property RH is restored with the latest backed up information upon restoration ofpower after shut down or power loss. This property defaults to 0.

Property RL is Run Limit. It specifies a runtime limit in hours for the output. Once the run hours for the fanoutput exceed the runtime limit (RH > RL), the NB-VAV will generate a runtime limit alarm. To clear the runlimit alarm or to receive another run limit alarm, you must set RH to 0.

Table 3-19 Binary Output Properties



object_identifier

Binary Output Object Identifier—a unique numeric code that is used to identify the object. Default value is “Binary Output (4), Instance X” where X is 1-5 for BO01-BO05 respectively.

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “BO0X” where X is 1-5 for BO01-BO05 respectively.

object_typeObject Type—indicates which object type class the property belongs to. In this case, object_type is Binary Output. Default value is “Binary Output (4).


status_flags



out_of_service


SECTION 3: NB-VAV PROPERTIES BINARY OUTPUTS (BO01-BO05)


polarity

Output polarity—used to define whether the output is normal acting or reverse acting. When polarity=0, the default value, the output acts as a normal acting output, the output is off when output control is not calling for the output to be on. When polarity=1,the output acts as a reverse acting output, the output is off when the control loop is calling for the output to be on.

0=Normal (default)1=Reverse

priority_array Priority array—a read-only array of prioritized values.

relinquish_defaultRelinquish default—a value to be used as the present_value when all values in the priority array are NULL.

Proprietary Binary Output Properties (BO01-BO05)

Fan(BO01) FC

Min cycle time—shows the minimum amount of time, in minutes (0.0 to 25.5), that the fan output will stay energized or de-energized. This prevents short cycling of the fan output. Default value i 2.0

FO

Fan/Damper Application—It is used to configure the fan or damper. 0=No Fan/Induction Damper 1=Series Fan 2=Parallel Fan 3=Induction Damper

FS

Fan Setpoint—It allows you to define the setpoint, in cubic feet per minute or liters of air flow as measured by the Flow Control object property CA, at which the fan or induction damper is enabled so that it can assist the terminal box in maintaining the minimum air flow requirements.

RH

Run hours—a time tracking property that displays hours and tenths of hours. The point reflects the amount of time that the output is actually allowing the fan to run as determined by the Relay Output property OP and the control loop demand. Run hours are stored in EEPROM automatically at midnight and when the property BU is enabled. Property RH is restored with the latest backed up information upon restoration of power after shut down or power loss. This property defaults to 0.





RL

Run limit—specifies a runtime limit in hours for the output. Once the run hours for the fan output exceed the runtime limit (RH > RL). The NB-VAV will generate a runtime limit alarm. To clear the run limit alarm or to receive another run limit alarm, you must set RH to 0.

SF

Fan mode—when a series fan box type is selected, SF defines how the series fan is controlled during unoccupied periods. 0=the series fan is always on during unoccupied periods. (Default)1=series fan control is based on zone temperature

Digital Outputs 2-5(BO02-BO05)

RH

Run hours—it is a time tracking property that displays hours and tenths of hours. The point reflects the amount of time that the output is actually allowing the fan to run as determined by the polarity and the present_value. Run hours are stored in EEPROM automatically at midnight and when the property BU is enabled. Property RH is restored with the latest backed up information upon restoration of power after shut down or power loss. This property defaults to 0.

RL

Run limit—specifies a runtime limit in hours for the output. Once the run hours for the fan output exceed the runtime limit (RH > RL). The NB-VAV will generate a runtime limit alarm. To clear the run limit alarm or to receive another run limit alarm, you must set RH to 0.



SECTION 3: NB-VAV PROPERTIES SCHEDULE


3.2.9 SCHEDULE

The NB-VAV operates in one of four active schedule states: warm-up mode occupied mode unoccupied mode night setback mode

There are two types of schedules: Weekly and Exception. A Weekly schedule consists of a sequence ofactions for each day of the week. You must set up a schedule for each day— Monday=1, Sunday=7.Exception schedules override weekly schedules.

An Exception Schedule is a list of times which take precedence over the weekly schedule. The exceptionschedule is usually a list of holidays or other special time periods which are to be handled differently fromthe preprogrammed schedule. The exception schedule in the NB-VAV is simply a pointer to the holidaycalendar and is configured using the Holiday Calendar object.

The following describes the four schedule states:

Warm-up is the period of time before occupancy. Warm-up provides special control action to bring the zonetemperature to its desired setpoint for the occupied mode, based on the warm-up setpoint. The propertiesused to define the warm-up temperature and flow appear in the analog inputs and damper control. Warm-up period ends when occupied mode begins.

Occupied mode is the period of time when the zone is occupied by people and the NB-VAV must maintainappropriate comfort levels in the zone. The heating and cooling setpoints define a desired zonetemperature range. Occupied mode ends when unoccupied mode time begins.

Unoccupied mode is the period of time when people are not expected to be in the zone and temperaturecontrol is not as strict. During unoccupied mode, the NB-VAV maintains cooling comfort levels at setupvalues and heating comfort levels at setback values. These setup and setback values are used to broadenthe control range between the heating and cooling setpoints in order to provide less stringent control. Theproperties used to define the offsets are located in the Heat/Cool Unoccupied objects.

Night setback is the period of time during unoccupied mode when the entire building is usually unoccupiedand the air handler may be shut down. The controller provides the option to set up and set back the nightsetback control temperature (as does the standard unoccupied mode) and to determine when theseoffsets are reached. As with unoccupied mode, the properties used to define the night setback offsets arelocated in the Heat/Cool Night Setback object.

3.2.9.1 STANDARD BACNET SCHEDULE PROPERTIES

NOTEThe Weekly Schedule Object cannot bechanges from the SAGEMAX. NB-Pro mustbe used to alter the Schedule Object.

SCHEDULE SECTION 3: NB-VAV PROPERTIES


Property object_identifier is a numeric code which is used to identify the object. It must be unique withinthe BACnet Device that maintains it. The default value for object_identifier is Analog Value (2), Instance7”.

Property object_name is a name for the object which is unique within the BACnet Device which maintainsit. The default value for object_name is “Schedule”. This property is read only.

Property object_type indicates which object type class value. This property is of type Schedule. Thedefault value for oject_type is “Schedule (17)”.

Property present_value is the current value of the schedule.

Property effective_period is the date(s) when a schedule is active.

Property weekly_schedule contains elements 1-7 which correspond to the days of the week withMonday=1 and Sunday=7. Each element tells the sequence of schedule actions for that day.

Property exception_schedule is the Exception Schedule. The elements of an exception scheduleoverride the elements of a weekly schedule. If the local_date equals any date in the Calendar Objectthen, the schedule will be set using the value in the exception schedule.

list_of_object_property_reference is Object ID/Property ID of the proprietary Schedule Object,present_value.

Property priority_for_writing defines the priority at which the referenced properties are commanded.This read only property’s value=7.

3.2.9.2 PROPRIETARY SCHEDULE PROPERTIESProperty HE is the host override enable. If HE=1, then HO is used as the host override state. The defaultvalue for HE is 0.

Property HO is the host override. It specifies the desired schedule override state when schedule propertyHE=1. If HE=0, then HO is not used. Setting HO to 0 represents unoccupied mode, HO=1 representswarm-up, HO=2 represents occupied mode, and HO=3 represents night setback. The default value for HOis 0.

Property IS is the Inactive Schedule State. It determines which schedule state the NB-VAV should followwhen there is not an active schedule. Valid schedule choices are unoccupied (IS=0), warm-up (IS=1),occupied (IS=2), and night setback (IS=3). This property defines the present_value to use when localscheduling is being used (the time is properly synchronized) but is inactive. The default value for IS is 3.

Property ZE is Receive Schedule. This property is reserved for a future implementation which supportszone broadcasting.

Table 3-20 Schedule Properties



object_identifiera numeric code which is used to identify the object. It must be unique within the BACnet Device that maintains it. Default Value is “Analog Value (2), Instance 7”.

SECTION 3: NB-VAV PROPERTIES SCHEDULE


object_name a name for the object which is unique within the BACnet Device which maintains it. Default value is “Schedule”.

object_type indicates which object type class value. This property is of type Schedule. Default value is “Schedule (17)”.

present_value shows the current value of the schedule.

effective_period the date(s) when a schedule is active

weekly_schedule

contains elements 1-7 which correspond to the days of the week with Monday=1 and Sunday=7. Each element tells the sequence of schedule actions for that day when no Exception Schedule is in effect.

exception_schedule

a list of schedule elements which override the elements of a weekly schedule. If the local_date equals any date in the Calendar Object then, the schedule will be set using the value in the exception schedule.

list_of_object_ property_reference

Object ID/Property ID of the proprietary Schedule Object, present_value.

priority_for_writing defines the priority at which the referenced properties are commanded. This read only property’s value=7

Proprietary Properties HE

Host Override Enable—0=No override1= HO is used as the host overrideDefault value is 0.

HO

Host Override—specifies the desired schedule override state when schedule property HE=1. Setting HE=0 represents unoccupied mode, HE=1 represents warm-up mode, HE=2 represents occupied mode and HE=3 represents night setback mode. Default value is HO=0.

IS

Inactive Schedule State—determines which schedule state the NB-VAV should follow when there is no active schedule. Valid schedule choices are unoccupied (IS=0), warm-up (IS=1), occupied (IS=2), and night setback (IS=3). This property defines the present_value to use when local scheduling is being used (the time is properly synchronized) but is inactive. Default value is IS=3.

ZEReceive Schedule—enables the NB-ASC(e) to receive network schedule broadcasts and sets present_value based on the received value. Default value is ZE=0.

Table 3-20 Schedule Properties


HOLIDAY CALENDAR SECTION 3: NB-VAV PROPERTIES


3.2.10 HOLIDAY CALENDAR3.2.10.1 STANDARD BACNET HOLIDAY CALENDAR PROPERTIESProperty object_identifier is a numeric code which is used to identify the object. The defaultobject_identifier is “Calendar (6), Instance 1”.

Property object_name is a name for the object which is unique within the BACnet Device which maintainsit. The default object_name is ““Holiday Calendar”. This property is read only.

Property object_type indicates which object type class value. This property is of type Calendar. Thedefault object_type is “Calendar (6)”.

Property present_value is the current value of the Calendar. If true, then local_date=any date in theCalendar list.

Property date_list is a list of Calendar Entries, which consist of individual dates or ranges of dates

.

NOTEThe date_list property cannot be changedfrom the SAGEMAX.

Table 3-21 Holiday Calendar Properties


Standard BACnetProperties

object_identifiera numeric code which is used to identify the object. It must be unique within the BACnet Device that maintains it. Default value is “Calendar (6), Instance 1”.

object_namea name for the object which is unique within the BACnet Device which maintains it. Default value is “Holiday Calendar”.

object_type indicates which object type class value. This property is of type Analog Input. Default value is “Calendar (6)”.

present_value current value of the Holiday Calendar. If true, then local_date=any date in the Calendar list.

date_lista list of Calendar Entries, which consist of individual date, ranges of dates, month, week of month, or day of week specifications.

SECTION 3: NB-VAV PROPERTIES FLOW SETPOINTS


3.2.11 FLOW SETPOINTS3.2.11.1 STANDARD BACNET FLOW SETPOINT PROPERTIESProperty object_identifier is the Flow Setpoints Object Identifier. This property is a unique numeric codethat is used to identify the object. The default object_identifier is “Proprietary (133), Instance 1”.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default object_name is “Flow Setpoints”. This property is read only.

Property object_type is Object Type. This indicates which object type class the property belongs to. Thedefault object_type is “Proprietary (133)”.

3.2.11.2 PROPRIETARY FLOW SETPOINTS PROPERTIESProperty CI is Cooling Integration Constant. This property shows the amount of proportional error history(o to 25.5%) used to calculate the desired position for the cooling duct damper. this point is also used tocalculate the error for the heating proportional band in Heating Only mode. The attribute is calculated eachtime the loop runs (once per second) creating an accumulated integral sum. This integral sum, appliedonce per minute, is used to control overshoot while the loop is operating within the confines of theproportional band. This point defaults to 5.0.

The P+I control loop controls the amount of integral (integral sum) that is accumulated by using anantireset windup strategy. When the control loop reaches its maximum (maximum air flow) or its minimum(minimum air flow), the integral sum is dumped. Integral will begin to be calculated again when the controlis once more within the proportional band.

Property CM is Cooling Minimum Flow. It shows the allowable minimum (cooling) duct flow, in CFM or lps,required while the controller is at the calculated cooling setpoint. The default value for CM is 100 CFM.

Property CP is Cooling Proportional Band. It specifies, in degrees (0.0 to 100), the offset from thecalculated cooling control setpoint that determines the proportional band for damper control. The dampercontrols air flow based on area temperature from CM to CX when cooling is called for by the controller.This point defaults to 5.0. The cooling proportional band is an offset that begins at the calculated coolingcontrol setpoint (CC). The cooling proportional band ends at CC + CP. The attribute CP defaults to 5.0.

Property CX is Cooling Maximum Flow. It shows the allowable maximum duct flow. This point has a rangeof 0-65,535 and defaults to 500 CFM.

Property HI is Heating Integration Constant. It shows the amount of proportional error history (0 to 25.5%)used to calculate the desired position for the heating duct damper. The value for this point is calculatedeach time that the loop runs (once per second) creating an accumulated integral sum. This integral sum,applied once per minute, is used to control overshoot while the loop is operating within the confines of theproportional band. The default value for HI is 5.0.

Property HM is Heating Minimum Flow. This property shows the allowable minimum heating duct flowduring heating. The point HM has a range of 0-65,535 and defaults to 100 CFM.

Property HP is Heating Proportional Band. This property specifies, in degrees, the offset from thecalculated heating control setpoint that determines the proportional band for the heating duct dampercontrol. This point is an offset from HC creating an operational band in which the damper control air flowbased on area temperature from HM to HX when heating is called for by the controller. Attribute HPdefaults to 5.0.

FLOW SETPOINTS SECTION 3: NB-VAV PROPERTIES


Property HX is Heating Maximum Flow. It shows the allowable maximum heating duct flow during heating.This attribute defaults to 500 CFM and can be set from 0 to 65,535.

Property WI is Warm-up Integration Constant. It shows the amount of proportional history (0 to 25.5%)used to calculate the desired position for the heating duct damper. The default value for WI is 10.

Property WM is Warm-up Minimum Flow. This property shows the allowable minimum heating duct flowduring warm-up. The default value for WM is 300 CFM.

Property WX is Warm-up Maximum Flow. It shows the allowable maximum (Heating) duct flow duringwarm-up which can be called for by schedule. This attribute defaults to 700 CFM and has a setting rangeof 0 to 65,535.

Property WP is Warm-up Proportional Band. This property specifies, in degrees (0.0 to 100), the offsetfrom the calculated heating control setpoint that determines the proportional band for the warm-up heatingduct damper control. The default value for WP is 5.0.

Property WX is Warm-up Maximum Flow. It shows the allowable maximum duct flow during warm-upwhich can be called for by schedule. This attribute defaults to 700 CFM and has a setting range of 0 to65,535.

Property AS is Air Quality Setpoint. This property specifies the acceptable CO2 level for the zone. Thisattribute defaults to 700 PPM and can be set from 0 to 65,535. A value of zero (0) will disable the NB-VAV’s Indoor Air Quality application.

Property AM is Air Quality Control Max Air Flow. This property specifies the maximum flow of air allowedduring Indoor Air Quality calculations. This attribute defaults to 400 CFM and can be set from 0 to 65,535.

Property RP is the Air Quality Damper Ramp Rate. This property specifies the rate (measured in percent-per-minute) that the NB-VAV’s damper moves to compensate for changes in CO2 levels. This attributedefaults to 10 %/min and has a setting range of 0 to 100.

Property DB is the Air Quality Deadband. This property specifies the CO2 variable range over which thedamper controlls airflow. This attribute defaults to 50PPM and has a setting range of 0 to 65,535.

Table 3-22 Flow Setpoints Properties



object_identifierDamper Channel Object Identifier—a unique numeric code that is used to identify the object. Default value is “Proprietary (133), Instance 1”.

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “Flow Setpoints”.

object_type Object Type—indicates which object type class the property belongs to. Default value is “Proprietary (133)”.

SECTION 3: NB-VAV PROPERTIES FLOW SETPOINTS


Proprietary Flow Setpoints Properties

CI

Cooling integration constant—shows the amount of proportional error history (o to 25.5%) used to calculate the desired position for the cooling duct damper. this point is also used to calculate the error for the heating proportional band in Heating Only mode. The attribute is calculated each time the loop runs (once per second) creating an accumulated integral sum. This integral sum, applied once per minute, is used to control overshoot while the loop is operating within the confines of the proportional band. This property defaults to 5.0.

CM

Cooling minimum flow—shows the allowable minimum (cooling) duct flow, in CFM or lps, required while the controller is at the calculated cooling setpoint. Default value is 100 CFM.

CP

Cooling proportional band—specifies, in degrees (0.0 to 100), the offset from the calculated cooling control setpoint that determines the proportional band for damper control. The damper controls air flow based on area temperature from CM to CX when cooling is called for by the controller. This point defaults to 5.0. The cooling proportional band is an offset that begins at the calculated cooling control setpoint (CC). The cooling proportional band ends at CC + CP. The attribute CP defaults to 5.0.

CXCooling maximum flow—shows the allowable maximum duct flow. This point has a range of 0-65,535 and defaults to 500 CFM.

HI

Heating integration constant—shows the amount of proportional error history (0 to 25.5%) used to calculate the desired position for the heating duct damper. The value for this point is calculated each time that the loop runs (once per second) creating an accumulated integral sum. This integral sum, applied once per minute, is used to control overshoot while the loop is operating within the confines of the proportional band. Default value is 5.0.

HMHeating minimum flow—shows the allowable minimum heating duct flow during heating. The point HM has a range of 0-65,535 and defaults to 100 CFM.

HP

Heating proportional band—specifies, in degrees, the offset from the calculated heating control setpoint that determines the proportional band for the heating duct damper control. This point is an offset from the heating setpoint (Zone Temperature:CH) creating an operational band in which the damper control air flow based on area temperature from HM to HX when heating is called for by the controller. Attribute HP defaults to 5.0.



FLOW SETPOINTS SECTION 3: NB-VAV PROPERTIES


HXHeating maximum flow—shows the allowable maximum heating duct flow during heating. This attribute defaults to 500 CFM and can be set from 0 to 65,535.

WI

Warmup integration constant—shows the amount of proportional history (0 to 25.5%) used to calculate the desired position for the heating duct damper. Default value is 10.

WMWarmup minimum flow—shows the allowable minimum heating duct flow during warm-up. Default value is 300 CFM.

WP

Warmup proportional band—specifies, in degrees (0.0 to 100), the offset from the calculated heating control setpoint that determines the proportional band for the warm-up heating duct damper control. Default value is 5.0.

WX

Warmup maximum flow—shows the allowable maximum duct flow during warm-up which can be called for by schedule. This attribute defaults to 700 CFM and has a setting range of 0 to 65,535.

AS

Air Quality Setpoint—This property specifies the acceptable CO2 level for the zone. This attribute defaults to 700 PPM and can be set from 0 to 65,535. A value of zero (0) will disable the NB-VAV’s Indoor Air Quality application.

AM

Air Quality Control Max Air Flow—This propertyspecifies the maximum flow of air allowed during Indoor AirQuality calculations. This attribute defaults to 400 CFMand can be set from 0 to 65,535.

RP

Air Quality Damper Ramp Rate—This property specifies the rate (measured in percent-per-minute) that the NB-VAV’s damper moves to compensate for changes in CO2 levels. This attribute defaults to 10 %/min and has a setting range of 0 to 100.

DB

Air Quality Deadband —This property specifies the CO2 variable range over which the damper controlls airflow. This attribute defaults to 50PPM and has a setting range of 0 to 65,535.



SECTION 3: NB-VAV PROPERTIES ELECTRIC REHEAT


3.2.12 ELECTRIC REHEATThe NB-VAV provides electric reheat capabilities with four stages of electric reheat available.

3.2.12.1 STANDARD BACNET ELECTRIC REHEAT PROPERTIESProperty object_identifier is Electric Reheat Object Identifier. This property is a unique numeric code thatis used to identify the object. The default object_identifier is “Proprietary (133), Instance 3”.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default object_name is “Electric Reheat”. This property is read only.


3.2.12.2 PROPRIETARY ELECTRIC REHEAT PROPERTIESProperty AF is Require Max Airflow. If set to Yes (AF=1), it holds off the addition of reheat stages until thePID loop calls for maximum airflow. This gives the damper priority in satisfying the heating demand. Forproper operation, a Heating Integration Constant should be used. This permits the PID loop to reach amaximum target airflow when the supply air is unable to satisfy the zone. The default value for AF is 0.

Property AV is Stages Available for Use. This property displays the stages that are currently available foruse. This depends on the current options and the presence of a positive flow indication. Other uses of thetriac outputs (AC actuator, for instance) may remove those stages from reheat availability. This property isread-only.

Property BA is Reheat Balance Mode. If set to Yes (BA=1), it considers the run hour totals for theindividual triac outputs in energizing reheat stages. Stages with lower usage will be energized first. Theresult is the balanced use of these stages. For best operation, all stages should be nearly equivalent. Thedefault setting, BA=0, does not perform balancing.

Property EN is Stages Energized. This property displays those reheat stages that are currently energized.EN is represented as a bitmap with bit0=K2, bit1=K3, bit2=K4 and bit3=K4. A value of 1 indicates that thestage associated with that bit is energized. This property is read-only.

Property FR is Stages Requiring Flow. This defines which of the available reheat stages require a positiveflow indication by the appropriate bit setting. FR is represented as a bitmap with bit0=K2, bit1=K3, bit2=K4and bit3=K5. A value of 1 indicates that the stage associated with that bit requires flow.

Property ID is Interstage Delay Time. It shows the minimum amount of time, in minutes, before the nextreheat stage will be energized. Stages are energized at this interval until the zone temperature rises towithin the reheat offset of the heating setpoint. This prevents power surges that might occur if both reheatswere to be energized at the same time. This property defaults to 4 minutes.

Property MX is Maximum Supply Temperature. This establishes a maximum supply duct temperatureabove which the reheats will de-energize. The default value for MX is 105.

ELECTRIC REHEAT SECTION 3: NB-VAV PROPERTIES


Property OF is Reheat Offset. This property specifies, in degrees, the offset from the calculated heatingcontrol setpoint that determines the temperature below which additional reheat stages can be energized.In addition to this, the AF attribute may be set to hold off the addition of stages. For temperature below theheating setpoint but within the reheat offset of it, reheat stages are de-energized at 30 second intervals.The default value of OF is 1.5.

Property RO is Reheat Application. This property is used to configure the NB-VAV’s outputs for electricreheat. The settings are 1=Disabled (default), 2=Two-stage (K2-3), 3=Two-stage (K4-5), and 4=Four-stage(K2-5).

NOTEIf not supply temperature is available(hardwired or broadcast) and unreliable,enter a value of 999.0 for MX.

Table 3-23 Electric Reheat Properties



object_identifierReheat Channel Object Identifier—a unique numeric code that is used to identify the object. Default value is “Proprietary (133), Instance 3”.

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “Electric Reheat”.


Proprietary Electric Reheat Properties

AF

Require max airflow?—if set to Yes (AF=1), it holds off the addition of reheat stages until the PID loop calls for maximum airflow. This gives the damper priority in satisfying the heating demand. For proper operation, a Heating Integration Constant should be used. This permits the PID loop to reach a maximum target airflow when the supply air is unable to satisfy the zone. The default value is AF=0.

AV

Stages available for use—displays the stages that are currently available for use. This depends on the current options and the presence of a positive flow indication. Other uses of the triac outputs (AC actuator, for instance) may remove those stages from reheat availability. This property is read-only.

SECTION 3: NB-VAV PROPERTIES ELECTRIC REHEAT


BA

Reheat balance mode—if set to Yes (BA=1), it considers the run hour totals for the individual triac outputs in energizing reheat stages. Stages with lower usage will be energized first. The result is the balanced use of these stages. For best operation, all stages should be nearly equivalent. The default setting, BA=0, does not perform balancing.

ENStages energized (default)—displays those reheat stages that are currently energized. This property is read-only.

FRStages requiring flow—defines which of the available reheat stages requires a positive flow indication by the appropriate bit setting.

ID

Interstage delay time—shows the minimum amount of time, in minutes, before the next reheat stage will be energized. Stages are energized at this interval until the zone temperature rises to within the reheat offset of the heating setpoint. This prevents power surges that might occur if both reheats were to be energized at the same time. ID defaults to 4 minutes.

MXMaximum supply temperature—establishes a maximum supply duct temperature above which the reheats will de-energize. Default value is 105.

OF

Reheat offset—specifies, in degrees, the offset from the calculated heating control setpoint that determines the temperature below which additional reheat stages can be energized. In addition to this, the AF attribute may be set to hold off the addition of stages. For temperature below the heating setpoint but within the reheat offset of it, reheat stages are de-energized at 30 second intervals. Default value is 1.5.

RO

Reheat Application—this property is used to configure the NB-VAV’s outputs for electric reheat. The settings are 0=Disabled (default), 1=Two-stage (K2-3), 2=Two-stage (K4-5), and 3=Four-stage (K2-5).

Table 3-23 Electric Reheat Properties


VALVE CTRL 1-2 SECTION 3: NB-VAV PROPERTIES


3.2.13 VALVE CTRL 1-2There are two types of PI valve control provided by the NB-VAV: pulse width modulated control and timebased ramp control. Pulse width modulation allows you to utilize a pulse width driven motor valve that theNB-VAV uses to PI calculate the percent of control needed. The controller then provides the equivalentpower pulse.

Valve control operates on a reverse acting ramp for hot water reheat operations. When the temperaturefalls the valve will move to a more open position. When the temperature begins to rise, the valve will moveto a more closed position.

In chilled water applications, the valve operates in a normal acting ramp. When the temperature rises, thevalve is driven in a positive direction. When the temperature begins to drop, the valve is driven to a moreclosed position.

This control loop operates on the basis of the travel time for the valve in use. Full travel time will result inthe valve being driven to its maximum open or closed position, depending on the direction of travelrequested.

The Valve Control attributes control the optional hot water reheat or chilled water cooling support interminal boxes. This attribute provides closed loop proportional plus integral (PI) control.

3.2.13.1 STANDARD BACNET VALVE CONTROL PROPERTIESProperty object_identifier is Valve Control Object Identifier. This property is a unique numeric code that isused to identify the object. The default value for object_identifier is “Proprietary (133), Instance X” whereX is either 8 or 9.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default object_name is “Valve Ctrl X” where X is 1 or 2.

Property object_type is Object Type. This indicates which object type class the property belongs to. In thiscase, object_type is Analog Input. The default object_type is “Proprietary (133)”.

3.2.13.2 PROPRIETARY VALVE CONTROL PROPERTIESProperty AM is Auto/Manual Mode. It selects the control mode for the valve output(s). If AM=0 (manual),then the valve position can be set by manually changing VD to the desired position. You can do thisthrough the use of the MS/TP network program. If AM=1 (automatic), then the valve position is set by thecontrol loop. The default value for AM is 0.

Property CD is Change Valve Direction. It is used to set the direction of the Valve outputs. When theattribute is set to 0, the direction is normal with an increase signal on BO02/BO04 and a decrease signalon BO03/BO05. With the attribute set 1, the outputs are reversed. The default value for CD is 0.

Property PP is Pulse Duration Period. This property shows the amount of time, in seconds, during whichthe valve is to be pulsed ON when pulse width modulation is enabled. For example, if PP=100 secondsand the NB-VAV is calling for 40% heat, then the valve is pulsed on for 40 seconds (a total of PP seconds).The output will continue to be pulsed on for 40 seconds every full travel period of 100 seconds. This willlast as long as 40% output control is called for by the control loop. This property defaults to 0 seconds.

Property RI is Recalibrate Interval. It shows the amount of time, from 1 to 255 hours, between valverecalibrations. You can recalibrate the valve position by setting the valve in the closed direction for the fulltravel time then restoring it to the desired position. Valve Motor Travel Time (VT) must equal some value

SECTION 3: NB-VAV PROPERTIES VALVE CTRL 1-2


greater than 0 for RI to be considered valid by the controller. When calibration occurs. the NB-VAV drivesthe valve closed for VT + 10 seconds of time. Once calibrated the controller drives the valve to VD (desiredvalve position). Calibration is disabled when you set RI to 0. This point defaults to 0.

Property ST is Valve Status. The options are off (ST=0), open (ST=1), close (ST=2), and calibrate (ST=3).

Property TH is DAT High Temperature Lockout. It defines the maximum source/duct temperature abovewhich heating will be disengaged. This offers protection against overheating. Heating stages will beenergized only if there is a reliable source/duct temperature below this setting. The default value for TH is105 degrees.

Property TL is DAT Low Temperature Lockout. It defines the minimum source/duct temperature belowwhich cooling will be disengaged. This offers protection against freeze-up. Cooling stages will beenergized only if there is a reliable source/duct temperature above this setting. The default value of TL is45 degrees.

Property UT is Update Threshold. The desired valve position is not updated until it differs from the actualvalve position by at least the amount specified by Update Threshold. The desired positions of 0% and100% are not subject to the threshold requirement. This attribute is used to minimize the actuation of thevalve for insignificant changes. The default value of UT is 5.

Property VA is Actual Valve position. It shows the actual valve position (in percent) based on travel time.This property is read only.

Property VD is Desired Valve Position. It shows the desired valve position with which the loop shouldcontrol the valve to bring the measured input variable closer to the setpoint. A change in VD causes thevalve to drive in the proper control direction. If AM=0, then VD can be set manually by a host.

Property VI is Valve Integration Constant. This property shows the amount of proportional error history (0to 3276.7) used to calculate the desired position for the valve and to create an accumulated integral sum.this integral sum, applied once per minute, is used to control overshoot while the loop is operating withinthe confines of the proportional band. This point defaults to 5.0.

Property VM is Valve Mode. The options are Pulse Width Modulation (VM=0) and Floating Point MotorControl (VM=1). The default value of VM is 0.

Property VO is Valve Offset. This property is added to CC or subtracted from HC (in the Zone Temperatureobject) for calculation of the loop setpoint. If the NB-VAV is configured for hot water control, then VO issubtracted from HC. If the NB-VAV is configured for chilled water control, then VO is added to CC. Thedefault value of VO is 0.0.

CAUTIONIf a supply temperature sensor does notexist and is unreliable, set both TL and THto 999.0. When TL and TH are set to 999.0,the valve control will not look for a supplytemperature.



Property VP is Valve Proportional Band. It specifies the input variable range, in degrees (0.0 to 3276.7),over which the output value is proportional to the error value. The proportional band is offset from thesetpoint for the loop. This point defaults to 5.0.

Property VT is Valve Motor Travel Time. This property shows the amount of time, in seconds, that it takesthe valve motor to travel when moving from a fully closed position to a full open position (0-100%) when inFloating Point Motor Control. The NB-VAV uses this time to determine the motor position when called forby the valve control PI. The maximum setting for this point is 3,000 seconds. The default value for VT is180.

Property VU is Valve Use. The options are disabled (VU=0), cooling (VU=1), and heating (VU=2). TheDefault Value for VU is 0.

Table 3-24 Valve Control Properties



object_identifierObject Identifier—a unique numeric code that is used to identify the object. Default value is “Proprietary (133), Instance X” where X is 8 or 9.

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “Valve CTRL X” where X is either 1 or 2.

object_typeObject Type—indicates which object type class the property belongs to. In this case, object_type is Analog Input. Default value is “Proprietary (133)”.

Standard Valve Control Properties

AM

Auto/Manual Mode—selects the control mode for the valve output(s). If AM=0 (manual), then the valve position can be set by manually changing VD to the desired position. You can do this through the use of the MS/TP network program. If AM=1 (automatic), then the valve position is set by the control loop. Default value is 0.

CD

Change Valve Direction—used to set the direction of the Valve outputs. When the attribute is set to 0, the direction is normal with an increase signal on BO02/BO04 and a decrease signal on BO03/BO05. With the attribute set 1, the outputs are reversed. Default value is 0.

PP

Pulse Duration Period—shows the amount of time, in seconds, during which the valve is to be pulsed ON when pulse width modulation is enabled. For example, if PP=100 seconds and the NB-VAV is calling for 40% heat, then the valve is pulsed on for 40 seconds (a total of PP seconds). The output will continue to be pulsed on for 40 seconds every full travel period of 100 seconds. This will last as long as 40% output control is called for by the control loop. This property defaults to 0 seconds.

SECTION 3: NB-VAV PROPERTIES VALVE CTRL 1-2


RI

Recalibrate Interval—shows the amount of time, from 1 to 255 hours, between valve recalibrations. You can recalibrate the valve position by setting the valve in the closed direction for the full travel time then restoring it to the desired position. Valve Motor Travel Time (VT) must equal some value greater than 0 for RI to be considered valid by the controller. When calibration occurs. the NB-VAV drives the valve closed for VT + 10 seconds of time. Once calibrated the controller drives the valve to VD (desired valve position). Calibration is disabled when you set RI to 0. This point defaults to 0.

ST Valve status—the options are off (ST=0), open (ST=1), close (ST=2), and calibrate (ST=3).

TH

DAT High Temperature Lockout—defines the maximum source/duct temperature above which heating will be disengaged. This offers protection against overheating. Heating stages will be energized only if there is a reliable source/duct temperature below this setting.

TL

DAT Low Temperature Lockout—defines the minimum source/duct temperature below which cooling will be disengaged. This offers protection against freeze-up. Cooling stages will be energized only if there is a reliable source/duct temperature above this setting.

UT

Update threshold—the desired valve position is not updated until it differs from the actual valve position by at least the amount specified by Update Threshold. The desired positions of 0% and 100% are not subject to the threshold requirement. This attribute is used to minimize the actuation of the valve for insignificant changes. Default value is 5.

VAActual Valve Position—shows the actual valve position (in percent) based on travel time. This property is read only.

VD

Desired Valve Position—shows the desired valve position with which the loop should control the valve to bring the measured input variable closer to the setpoint. A change in VD causes the valve to drive in the proper control direction. If AM=0, then VD can be set manually by a host.





VI

Valve Integration Constant—shows the amount of proportional error history (0 to 25.5%) used to calculate the desired position for the valve and to create an accumulated integral sum. This integral sum, applied once per minute, is used to control overshoot while the loop is operating within the confines of the proportional band. This point defaults to 5.0.

VMValve Mode—the options are Pulse Width Modulation (VM=0) and Floating Point Motor Control (VM=1). Default value is 0.

VO

Valve Offset—this property is added to CC or subtracted from CH for calculation of the loop setpoint. If the NB-VAV is configured for hot water control, then VO is subtracted from CH. If the NB-VAV is configured for chilled water control, then VO is added to CC. Default value is 0.0.

VP

Valve Proportional Band—specifies the input variable range, in degrees (0.0 to 25.5), over which the output value is proportional to the error value. The proportional band is offset from the setpoint for the loop. This point defaults to 5.0.

VT

Valve Motor Travel Time—shows the amount of time, in seconds, that it takes the valve motor to travel when moving from a fully closed position to a full open position (0-100%) when in Floating Point Motor Control. The NB-VAV uses this time to determine the motor position when called for by the valve control PI. The maximum setting for this point is 3,000 seconds. Default value is 180.

VU Valve Use—the options are disabled (VU=0), cooling (VU=1), and heating (VU=2). Default value is 0.



SECTION 3: NB-VAV PROPERTIES ANALOG CONTROL


3.2.14 ANALOG CONTROL3.2.14.1 STANDARD BACNET ANALOG CONTROL PROPERTIESProperty object_identifier is Analog Control Object Identifier. This property is a unique numeric code thatis used to identify the object. The default object_identifier is “Proprietary (133), Instance 11”.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default object_name is “Analog Control”. This property is read only.

Property object_type is Object Type. This indicates which object type class the property belongs to.Thedefault object_type is “Proprietary (133)”.

3.2.14.2 PROPRIETARY ANALOG CONTROL PROPERTIESProperty AO is Analog Output Value. It shows the scaled output value used by the analog output and is areflection of the Analog Output property present_value. This point is the PO value scaled toAO01:min_pres_value and AO01:max_pres_value of the corresponding analog output AO. You canwrite to attribute AO when the Analog Output attribute AM=0.

Property CE is Enable Control Loop. It enables the PID loop. When CE=0, PO is not updated. To enable,set CE=1. The default value for CE is 0.

Property CS is Calculated Control Setpoint. It shows the actual loop control setpoint. This read-only pointreflects the unoccupied setup/setback as well as any reset and/or SBC-STAT setpoint adjustment. Thispoint is expressed in the same kind of measurement unit (engineering units) that the measured variableuses (e.g., degrees, cfm, inches of WC, etc.). The data type of the selected measured variable.

Property DB is Deadband. It specifies the deadband within the proportional control band in which theoutput remains constant at a point between maximum output and minimum output. By specifying a DB thatis greater than or equal to the resolution of the sensor specified in IC, you eliminate the possibility ofcycling around the setpoint. The value of DB should never exceed the proportional band PB. If DB isgreater than PB, then the control loop will not have proportional control.

The property DB relates to the resolution of the input variable of the control loop. Recall that the range of a15-bit, analog input is scaled into 32,767 equal divisions. The NB-VAV can recognize input changes thatare greater than or equal to the resolution of each of the divisions. For linear analog input devices having alarge operational range, the size of each division is also relatively large. For a linear analog input devicehaving a relatively small operational range, the size of each division is relatively small.

In the case of nonlinear sensors such as thermistors, the resolution of each division becomes moreirregular as the temperature range extends to the outer limits of the operational range. At these outer limitsof the sensor’s operation range, one small division may represent a very large or very small temperaturerange because of the nonlinear nature of the sensor’s response curve. The incidence of this phenomenonis even more pronounced with the use of an 8-bit analog input sensor.

Whether or not the divisions of a particular sensor represent a relatively large or relatively small number, itis important to realize that if the setpoint (SP) chosen does not exactly fall on one of these divisions, theNB-VAV will never attain the setpoint. The resulting control action will be an oscillation of the output aroundthe setpoint. In order to eliminate the effects of this hunting action, a deadband can be programmed that iscentered on the selected setpoint.

ANALOG CONTROL SECTION 3: NB-VAV PROPERTIES


The point DB is centered on the setpoint SP to create the actual control deadband. When the value of thecontrol variable is within ±DB/2 of the Loop Setpoint (SP), the NB-VAV assumes that it has reached thesetpoint.

By entering a value in DB that is greater than the resolution of the measured variable sensor, you create adeadband that allows the NB-VAV to effectively reach setpoint.

At this point, the NB-VAV will provide simple closed loop feedback proportional control. This means thatthe actual measured performance of the control (from the measured variable input) is fed back to thecontroller and is compared with the effective setpoint for the loop. Any difference between the actual valueof the measured variable (let’s call this MV) and effective setpoint values is called error (MV−CS).

One problem with proportional only control is the changes in loop performance only occurs when thecondition being measured by the input sensor changes (e.g., the measured temperature changes when adoor is opened and the room or space is flooded with cold air).

As the loop environment changes, the proportional only control loop begins to cycle around an offset fromthe setpoint.

Property IC is Input Select. It specifies the input to be used for the control loop’s measured variable. Avalue of 0 in IC disables the control loop. Settings for IC are shown in Table 3-25.

Property IN is Input Value. It is read only and displays the value of the input selected in IC.

Property MR is Maximum Amount to Reset Setpoint. This property specifies the maximum amount neededto reset the loop setpoint (SP) based on when reset is being used. Property CS takes into account the useof the maximum reset specified in MR. The default value for MR is 0.0.

Property PB is Proportional Band. It specifies the input variable range over which the output value isproportional to the error value (i.e., changes in the measured variable result in proportional changes in theoutput signal). The proportional band is centered around setpoint for the loop. This point is expressed in

Table 3-25 Settings for IC

Value of IC Input Used

IC=0 Disabled

IC=1 Zone Temp

IC=2 Supply Temp

IC=3 Flow

IC=4 UI1

IC=5 UI2

IC=9 Zone Heat

IC=10 Zone Cool



the same kind of measurement units (engineering units) that the measured variable uses—for example:degrees, cfm, inches W.C. The data type of PB is the same as the data type of the selected measuredvariable.

To determine PB, first decide how closely the NB-VAV must control the output to the setpoint. For instance,if the setpoint is 72°F, then an acceptable control range might be within two degrees of the setpoint. Thiscontrol range can be expressed as a band centered on the setpoint: from 70° to 74°, or 4 degrees—theproportional band. The default value for PB is 0.0.

For normal acting control loops, PO is set to maximum output when the input variable equals the setpointplus half of the proportional band (SP+PB/2). The point PO is set to minimum output when the inputvariable equals the setpoint minus half of the proportional band (SP-PB/2). These associations arereversed for reverse acting control loops.

Property PO is Percent Output Value. This property shows the output value in hundredths of a percent(e.g., 75.00%). The value is calculated based on the error, change in error and past error for the controlloop. The point is then scaled to the selected engineering units of the analog output and is stuffed into theAO property as well as into present_value of the analog output. This point can be set manually if thecontrol loop is disabled (CE=0).

Property RC is Reset Variable’s Value. It displays the value of the input selected in RV.

Property RL is Limit for Maximum Reset. It specifies the value at which maximum reset is used. When thevalue of the reset variable is equal to RL, the maximum reset (MR) is used in determining the calculatedsetpoint. The default value for RL is 0.0.

The relationship between RL and RS, as well as the sign (+ or -) of MR, determines how changes in thereset variable RV affect the setpoint of the loop SP.

Property RP is Reset Period. This property specifies the reset period, in seconds, over which the errorhistory is accumulated. If RP=1- seconds with a constant error of 2.0, then the error history would increaseby 0.2 every second. In five seconds, the error history would be 1.0. At the end of ten seconds, the errorhistory would be 2.0. Setting RP to 0 disables integral action. The longer RP is, the less effect it has on thecontrol response. A value of 0 disables the reset period. The default value for RP is 0.

At the start-up of the loop or following a change in setpoint, the error is fairly large. Proportional actioncauses the loop output to accelerate toward the setpoint. However by the time the loop response reachesthe setpoint value, it has gained inertia from the preceding proportional action. This causes the loop toovershoot the setpoint. As the loop exceeds the setpoint moving toward its first peak, the error sum isaccumulating. This slows down the acceleration, eventually causing the downturn in response.

As the error falls and then drops below the setpoint, the error sum will be reduced because now the error isin the opposite direction. The cycle continues in diminishing peaks until it finally converges at the setpoint.

The proportional control action of the loop has a major effect on integral action. Increasing PB results in asmaller integral effect for a given value of RP. In general, decreasing the proportional band PB willincrease the amount of overshoot. On the other hand, the larger PB is, the slower the loop response.

Several important factors may not be obvious to inexperienced users of these DDC techniques.

First, whenever the error falls outside of the proportional band—that is, ±PB/2 from the setpoint, twoimportant things happen: the controller’s output is fully pegged in the appropriate direction, and the error



sum stops accumulating. The control produces its maximum output because it must bring the error withinthe proportional band again. The error sum stops accumulating so that it does not “wind up” a massiveerror sum that would take many control cycles to dissipate. This feature is called antireset windup.

Antireset windup also makes the loop recover quickly when it reenters the proportional band. Anotherfeature of antireset windup is that the error history is limited to PB/2 because that is all that required toproduce maximum output. Additional error accumulation would only slow down loop recovery.

To quicken loop response while eliminating overshoot, derivative action must be taken. Derivative actiontakes into account the rate of change in error and allows the NB-VAV to counter the effects of the error’srate of change on the control output. To find the change in error, subtract the current error (read everysecond by the PID loop) from the previous second’s error. A percentage of this change (specified by RT)becomes the derivative contribution to the PID output.

Property RS is the Setpoint at Which Reset Action Begins. This property specifies the value at which thereset action begins. When the value of the reset variable exceeds RS, reset action will be used indetermining the calculated setpoint. Just as SP is the proportional control setpoint for MV, RS is the resetcontrol setpoint for the value of the reset variable selected by RV. The data type of RS is the same as thedata type of the reset variable specifies by RV.

Property RT is Derivative Rate. It specifies a percentage of change in error that is to be used in calculatingPO. The value is specified in percent per second. The point RT can have any value from 0.0 to 25.5% persecond. The default value for RT is 0.0.

Property RV is Reset Variable. It specifies the input to be used for calculating the reset used by the controlloop. This point provides the ability to control a loop using one input while resetting the loop using adifferent input. The default value for RV is 0.

Property SG is Control Action. It specifies the control action for the control loop. When SG=0 (normal), apositive error causes an increase in output. When SG=1 (reverse), a positive error causes a decrease inoutput. This point determines the response of the loop output to the kind of error. If the output action is tobe increased (toward max) when the error is positive (MV > SP), set SG to normal (0). If the output actionis to be decreased (toward min) for positive error, set SG to reverse (1). (Attribute SG is also used during

Table 3-26 Settings for RV

Value of RV Input Used

RV=0 Disabled

RV=1 Zone Temp

RV=2 Supply Temp

RV=3 Flow

RV=4 UI1

RV=5 UI2



schedule control to determine whether SU is added to SP [SG=0] or subtracted from SP [SG=1] duringunoccupied periods.) For more information, refer to attribute SU. The default value for SV is 0.

Property SP is Loop Setpoint. It specifies the desired loop setpoint. In PID control, the setpoint is defined inSP. The measured input variable is the analog sensor referenced by the universal input specified in IC.The setpoint is expressed in the same kind of measurement units (engineering units) that the measuredvariable uses (e.g., degrees, cfm, inches of WC, etc.). For example, when using the analog controlattributes to adjust cooling dampers to control a temperature value that the input sensor measures (indegrees), you must express the setpoint for the analog control in degrees. The data type of SP is the sameas the data type of the selected measured variable. This value is used with the unoccupied setup/setbackand the reset to calculate CS.

Property SU is Unoccupied Setup/Setback. This point specifies the amount to add (if SG=0) or subtract (ifSG=1) from the setpoint during an unoccupied period. The adjusted setpoint will be displayed in CS. Theattribute CS (the effective setpoint incorporates any setup/setback that may exist as well as any reset orsetpoint adjustment from the SBC-STAT). The data type of the value specified in SU is the same as thedata type of the referenced measured variable specified by IC. The default value for SU is 0.0.

Table 3-27 Analog Control Properties



object_identifierDamper Channel Object Identifier—a unique numeric code that is used to identify the object. Default value is “Proprietary (133), Instance 11”.

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “Analog Control”.


Proprietary Analog Control Properties

AOAnalog Output Value—shows the scaled output value used by the analog output and is a reflection of the Analog Output property present_value.

CEEnable Control Loop—enables the PID loop. When CE=0, PO is not updated. To enable, set CE=1. Default value is 0.

CS

Calculated Control Setpoint—shows the actual loop control setpoint. This read-only point reflects the unoccupied setup/setback as well as any reset and/or SBC-STAT setpoint adjustment.

DB

Deadband—specifies the deadband within the proportional control band in which the output remains constant at a point midway between maximum output and minimum output.



IC

Input Select—specifies the input to be used for the control loop’s measured variable. 0=Disabled1=Zone Temp2=Supply Temp3=Flow4=UI15=UI29=Zone Heat10=Zone Cool

IN Input Value—displays the value of the input selected in IC.

MRMaximum Amount to Reset Setpoint—specifies the maximum amount needed to reset the loop setpoint (SP) based on when reset is being used. Default value is 0.0.

PB

Proportional Band—specifies the input variable range over which the output value is proportional to the error value (i.e., changes in the measured variable result in proportional changes in the output signal). Default value is 0.0.

PO Percent Output Value—shows the output value in hundredths of a percent (e.g., 75.00%).

RC Reset Variable’s Value—displays the value of the input selected in RV.

RL Limit for Maximum Reset—specifies the value at which maximum reset is used. Default value is 0.0.

RPReset Period—specifies the reset period, in seconds, over which the error history is accumulated. 0 disables the reset period. Default value is 0.

RS

Setpoint at Which Reset Action Begins—specifies the value at which the reset action begins. When the value of the reset variable exceeds RS, reset action will be used in determining the calculated setpoint.

RTDerivative Rate—specifies a percentage of change in error that is to be used in calculating PO. RT can have any value from 0.0 to 25.5% per second. Default value is 0.0.





RV

Reset Variable—specifies the input to be used for calculating the reset used by the control loop. 0=disables reset (Default)1=zone temp2=supply temp3=flow4=UI15=UI2

SG

Control Action—specifies the control action for the control loop. When SG=0 (normal), a positive error causes an increase in output. When SG=1 (reverse), a positive error causes a decrease in output. Default value is 0.

SP Loop Setpoint—specifies the desired loop setpoint.

SUUnoccupied Setup/Setback—specifies the amount to add (if SG=0) or subtract (if SG=1) from the setpoint during an unoccupied period. Default value is 0.0.



OCCUPANCY DETECTOR SECTION 3: NB-VAV PROPERTIES


3.2.15 OCCUPANCY DETECTORThe Occupancy Detector properties allow you to define the circumstances under which the NB-VAV willautomatically switch to an extended occupied mode during unoccupied periods when an occupancydetector is used with the controller.

3.2.15.1 STANDARD BACNET OCCUPANCY DETECTION PROPERTIESProperty object_identifier is a unique numeric code that is used to identify the object. The defaultobject_identifier is “Proprietary (131), Instance 1”.

Property object_name is a unique name used to represent an object within the BACnet device. The namemust be at least one character in length and it must consist of printable characters. The defaultobject_name is “Occupancy Detection”. This property is read only

Property object_type indicates which object type class the property belongs to. The default object_typeis “Proprietary (131)”.

3.2.15.2 PROPRIETARY OCCUPANCY DETECTION PROPERTIESProperty IC is Input Select. When IC=0, occupancy detection is disabled, 1=UI1, and 2=UI2. The defaultvalue for IC is 0.

Property MD is Extended Occupancy Delay. It sets the amount of time, in seconds, during which theoccupancy detector must remain on before the occupancy detector will override the zone. This preventsfalse triggers that might occur as others pass quickly through the zone. The default value for MD is 30.

Property MR is Extended Occupancy Remaining. This read-only point displays the time remaining foroccupancy detector override.

Property MS is Occupancy Detector Input Status. This read-only point shows the status of the occupancydetector digital input. To enable occupancy detection, MT must be greater than 0 and UI1 or UI2 (towhichever the occupancy detector is connected) MUST be configured as digital (UI1or UI2 ST=0). If eitherof these two conditions are not met, MS will display 0. When this point is enabled (MS=1) and whenoccupancy in the zone is detected during unoccupied periods, the occupancy input extends occupancytime by the amount specified in MT.

Property MT is Extended Occupancy Duration. It defines, in minutes, the length of time needed to overridethe zone whenever occupancy is detected. The default value for MT is 10.

Table 3-28 Occupancy Detection Properties



object_identifier

Occupancy Object Identifier—a numeric code which is used to identify the object. It must be unique within the BACnet Device that maintains it. Default value is “Proprietary (131), Instance 1”.

object_nameName—a name for the object which is unique within the BACnet Device which maintains it. Default value is “Occupancy Detection”.

object_typeObject Type—indicates which object type class value. This property is of type Analog Input. Default value is “Proprietary (131)”.

SECTION 3: NB-VAV PROPERTIES OCCUPANCY DETECTOR


Proprietary Properties IC

Input Select—selects the input to be used for occupancy detection.0=disabled1=UI12=UI2

MD

Extended Occupancy Delay—sets the amount of time, in seconds, during which the occupancy detector must remain on before the occupancy detector will override the zone. This prevents false triggers that might occur as others pass quickly through the zone.

MRExtended Occupancy Remaining—read-only point that displays the time remaining for occupancy detector override.

MS

Occupancy Detector Input Status—a read-only point that shows the status of the occupancy detector digital input. To enable occupancy detection, MT must be greater than 0 and UI1 or UI2 (to whichever the occupancy detector is connected) MUST be configured as digital (UI1 or UI2 ST=0). If either of these two conditions are not met, MS will display 0.

MTExtended Occupancy Duration—defines, in minutes, the length of time needed to override the zone whenever occupancy is detected.

Table 3-28 Occupancy Detection Properties


PROOF OF FLOW SECTION 3: NB-VAV PROPERTIES


3.2.16 PROOF OF FLOW3.2.16.1 STANDARD BACNET PROOF OF FLOW PROPERTIESProperty object_identifier is Proof of Flow Identifier. This property is a unique numeric code that is usedto identify the object. The default object_identifier is “Proprietary (131), Instance 2”.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default object_name is “Proof of Flow”. This property is read only.


3.2.16.2 PROPRIETARY PROOF OF FLOW PROPERTIESProperty PF is Proof of Flow. It shows the status of the Proof of Flow, the flow control present_value.PF=0 corresponds to no flow, while PF=1 indicates that flow is present.

Property DR is Method to determine flow. This defines the requirements for Proof of Flow. Indication ofPositive Flow always appears if None is selected (DR=0). If Minimum Flow is selected (DR=1), then theMeasured Flow must exceed MF for a Positive Flow indication to occur. If Paddle Switch (DR=2) isselected, then the UI input must be nonzero for a Positive Flow indication. You may select Both (DR=3) forcases in which both the minimum flow reading and a nonzero UI is required. The default value for DR is 0.

Property IC is Input Select. Selects the digital input where a non-zero value indicates flow. The defaultvalue for IC is 0.

Property MF is Minimum Required Flow. It is the minimum flow reading required to indicate Positive Flow.The flow reading from the flow control CA is used. This is a long term average and provides sufficientfiltering to prevent false Proof of Flow indications. This point works in conjunction with DR indicating a userdefinable flow that allows reheats to be engaged. The property is used only when DR=1 or 3. The defaultvalue for MF is 75.

Property PD is Proof of Flow Delay. It shows the amount of time, from 0 to 255 seconds, imposed beforethe enabling of a positive flow indication. The default value of PD is 60.

Table 3-29 Settings for IC

Value of IC Input Used

IC=0 Disabled

IC=1 UI1

IC=2 UI2

SECTION 3: NB-VAV PROPERTIES PROOF OF FLOW


Table 3-30 Proof of Flow Properties



object_identifierProof Channel Object Identifier—a unique numeric code that is used to identify the object. Default value is “Proprietary (131), Instance 2”.,

object_name

Name—a unique name used to represent an object within the BACnet device. The name must be at least one character in length and it must consist of printable characters. Default value is “Proof of Flow”.


Proprietary Proof of Flow Properties

DR

Method to Determine Flow—defines the requirements for Proof of Flow. 0=None (default)1=Minimum Flow2=Digital Input3=Both

IC

Input Select—specifies the input to be used for the control loop’s measured variable.0=Disabled (default)1=UI12=UI2

MF

Minimum Required Flow—the minimum flow reading required to indicate Positive Flow. The flow reading from the Flow Control:CA is used. This is a long term average and provides sufficient filtering to prevent false Proof of Flow indications. This point works in conjunction with DR indicating a user definable flow that allows reheats to be engaged. The property is used only when DR=1 or 3. Default value is 75.

PDProof of Flow Delay—shows the amount of time, from 0 to 255 seconds, imposed before the enabling of a positive flow indication.

PFProof of Flow—shows the status of the Proof of Flow, the flow control present_value. PF=0 corresponds to no flow, while PF=1 indicates that flow is present.

BROADCAST SCHEDULE SECTION 3: NB-VAV PROPERTIES


3.2.17 BROADCAST SCHEDULE3.2.17.1 STANDARD BACNET BROADCAST SCHEDULE PROPERTIESProperty object_identifier is Proof Object Identifier. This property is a unique numeric code that is used toidentify the object. The default object_identifier is “Proprietary (143), Instance 5”.

Property object_name is Name. This property is a unique name used to represent an object within theBACnet device. The name must be at least one character in length and it must consist of printablecharacters. The default object_name is “Broadcast Schedule”.

Property object_type is Object type. This indicates which object type class the property belongs to. Thedefault object_type is “Proprietary (143)”.

3.2.17.2 PROPRIETARY BROADCAST SCHEDULE PROPERTIESProperty CV is Current Value of Network Broadcast Value. It shows the current value of the networkbroadcast schedule values received by the NB-VAV. When RB is enabled, CV is forced into the MainSchedule attribute present_value and is used as the functioning schedule value of the NB-VAV.

Property RB is Receive Broadcasts. It enables the NB-VAV to receive network broadcasts and sets theSchedule:present_value property to the received value. If RB=0, then receive broadcast is disabled. IfRB=1, then the NB-VAV receives the network value and places it in the Schedule:present_value property.(This overrides the schedules of the NB-VAV, which become ineffective). The default value for RB is 0.

Table 3-31 Broadcast Schedule Properties



object_identifier

Object Identifier—a numeric code which is used to identify the object. It must be unique within the BACnet Device that maintains it. Default value is “Proprietary (143), Instance 5”.

object_nameName—a name for the object which is unique within the BACnet Device which maintains it. Default value is “Broadcast Schedule”.

object_typeObject Type—indicates which object type class value. This property is of type Analog Input. Default value is “Proprietary (143)”.

Proprietary Broadcast Schedule Properties

CV Current Value—shows the current value of the network broadcast schedule values received by the NB-VAV.

RB

Receive Broadcast—enables the NB-VAV to receive network broadcasts and sets CV value based on the received value. If RB=0, then receive broadcast is disabled. If RB=1, then the NB-VAV receives the network value and places it in the Schedule:present_value. (This overrides the schedules of the NB-VAV, which become ineffective). Default value is 0.


IN THIS SECTIONScheduling ............................................................................................................................................................... 4-3 Inactive Schedule State....................................................................................................................................... 4-4 Broadcast Schedule............................................................................................................................................ 4-4 Power-up State.................................................................................................................................................... 4-4 Host Override...................................................................................................................................................... 4-5 User Override...................................................................................................................................................... 4-5 Occupancy Detection .......................................................................................................................................... 4-6Setting the Temperature and Flow Setpoints ........................................................................................................... 4-7NB-VAV Control Modes............................................................................................................................................ 4-9 Constant Air Volume (CAV)................................................................................................................................. 4-9 Supply Dependent (VST) .................................................................................................................................. 4-10 Heating Only ..................................................................................................................................................... 4-14 Cooling Only ..................................................................................................................................................... 4-18 Cooling with Reheat .......................................................................................................................................... 4-21Auxiliary Functions................................................................................................................................................. 4-26 Series Fan......................................................................................................................................................... 4-26 Parallel Fan....................................................................................................................................................... 4-26 Induction Damper.............................................................................................................................................. 4-27 Valve Control..................................................................................................................................................... 4-27Digital Outputs........................................................................................................................................................ 4-35Dual Duct Application............................................................................................................................................. 4-36Tracking ................................................................................................................................................................. 4-40Indoor Air Quality ................................................................................................................................................... 4-41

SECTION 4: CONFIGURATION

The NB-VAV model controllers can provide control for a wide range of VAV terminal boxapplications as well as CAV control. This section covers the configurations for scheduling,airflow, auxiliary functions such as fan operation and electric reheat, and the controller’s alarmingcapabilities.

SECTION 4: CONFIGURATION


SECTION 4: CONFIGURATION SCHEDULING


4.1 SCHEDULINGScheduling controls the current zone temperature setpoint of the NB-VAV. Internal schedules can bedefined by the user. The user can determine when and in which schedule mode (or state) the NB-VAV willoperate—occupied, warm-up, unoccupied, or night setback. See Section 3: NB-VAV Properties for adescription of each schedule mode.

To set the time and date in the NB-VAV, select Device:local-time from the properties window in NB-Pro.Then click on the hours, minutes, seconds, or AM/PM and use the up and down arrow buttons to the rightof the Value field to change the time. Click the Update Value button. Next, select Device:local-date fromthe properties dialog box in NB-Pro. Select the date from the drop down calendar in the Value field. Clickon Update Value.

To configure the schedule itself, you should perform the following steps:

1. Click on the weekly_schedule property located in the Schedule object. Once selected, the value edi-tor will show a template with:

A drop-down menu with the days of the week (Monday - Sunday) Adjustable time field (12:00am - 12:00pm) A drop-down menu with the valid schedule states A Scrolling list for viewing all current scheduled state time commands

2. Select the desired day from the drop-down menu. Once selected, your schedule for that particular day will populate in the scroll list.

3. In order to update a schedule for a specific day, you MUST clear all schedule information out for the particular day, prior to entering changes. To do this, click on the Clear button. Once the scroll list has cleared, you may begin to enter in schedule information.

4. Select the desired state mode from the schedule states provided, and adjust the time field to the time when you want the selected mode to begin. Once you have set the time to a desired value, hit the Add Entry button to add the schedule value to the Schedule. This will appear in the scrolling list. Repeat the same action for all of the 4 State modes of the weekly schedule that you wish to set.

5. Once you have programmed in the schedule for the particular day, simply hit the Update Value button to update the weekly_schedule property.

NOTESchedules can only be set up using NB-Pro.Schedules can not be set up using SAGEMAX

Area Controllers.

NOTEBefore configuring the internal schedules, makesure to set the local-time and local-dateproperties in the Device Object.

SCHEDULING SECTION 4: CONFIGURATION


Eight factors can cause the current internal schedule to be overridden. The following list is the order ofprecedence in which the overrides can occur.1. User Override from SBC-STAT (highest priority)2. Occupancy Detection3. Broadcast Value4. Host Override5. Power-up State6. Schedule Broadcast 7. All-day Override 8. Inactive Schedule State (lowest priority)

The following subsections provide an explanation of the eight factors that can cause the current internalschedule to be overridden.

4.1.1 INACTIVE SCHEDULE STATEThe current internal schedule will be overridden if the Schedule:(IS) Inactive Schedule State property isset to a higher priority schedule mode than the current internal schedule’s active mode. For example, if thecurrent internal schedule’s active mode is unoccupied, and IS is warm-up, the current internal schedulewill be overridden and the NB-VAV will operate in warm-up mode because warm-up mode is a higherpriority schedule mode than unoccupied mode.

The schedule mode set in IS will be the active schedule mode unless: there is an active schedule a scheduled broadcast is received the host overrides the schedule an occupancy sensor is properly configured and occupancy is detected user override occurs.

4.1.2 BROADCAST SCHEDULE The Broadcast Schedule is a schedule sent out over the network by another controller. The active internalschedule will be overridden if the NB-VAV is configured to receive network broadcast schedules. If theBroadcast Schedule:(RB) receive broadcast? property is enabled, the current schedule will reflect theBroadcast Schedule:(CV) current value of network broadcast value property. To configure the NB-VAVto receive network broadcast schedules, set the (RB) receive broadcast? property to True(1).

The schedule mode set by the schedule broadcast is the active mode until: the host overrides the schedule a new broadcast is received an occupancy sensor is properly configured and occupancy is detected user override occurs

4.1.3 POWER-UP STATEIf an unscheduled power loss occurs and power is restored, or if a soft reset of the NB-VAV is performed(Device:reset set equal to 1), the NB-VAV will operate in the schedule mode defined by the user in thePower-up State (Device:(PS) power-up state) property until the Device:local-time is set or synchronizedby a host. To set the schedule mode in which you want the NB-VAV to operate upon power restoration or

SECTION 4: CONFIGURATION SCHEDULING


after a soft reset has occurred, select the value that corresponds to the desired power-up state. Thepossible states are listed in Table 4-1.

4.1.4 HOST OVERRIDEWhen the Schedule:(HE) host overrides property is enabled, the host can set the value of theSchedule:present_value property through the Schedule:(HO) host schedule property. To enable hostoverride, set HE to true.

The schedule mode set in HO will be the active mode unless: a broadcast is received an occupancy sensor is properly configured and occupancy is detected user override occurs

4.1.5 USER OVERRIDEIf the active schedule controlling the NB-VAV is in unoccupied or night setback mode, user override ispossible. If the user presses the up or down arrow push-button on the SBC-Stat2, SBC-Stat2D, or SBC-Stat3 and the Zone Temperature:(SE) override disabled/enabled property is enabled, the NB-VAV will goto occupied mode. The duration of this mode, which is also called extended occupancy, can be set byusing the Zone Temperature:(ED) Extended Occupancy Duration property. To configure the NB-VAV foruser override ability via an SBC-STAT, you must first enable user override by setting ZoneTemperature:(SE) override disabled/enabled to enabled. Then, enter the number of minutes you wantthe NB-VAV to remain in occupied mode (extended occupancy) once the up or down arrow push-button onthe SBC-STAT2 or STAT3 is pressed. This value must be greater than zero, otherwise, user override willnot take effect. The number of minutes should be entered in the Zone Temperature:(ED) extendedoccupancy time property.

Table 4-1 : Power-up States

value Power-Up State

0 Unoccupied

1 Warm-up

2 Occupied

3 Night Setback

NOTEThe NB-VAV will remain in the schedulemode set in PS until the local-time is set orsynchronized by a host. Once the local-timeis set or synchronized, the NB-VAV willreturn to its internal schedule mode. Alsonote that one of the other overriding factorsmay be preventing the NB-VAV fromreturning to the expected schedule modeonce the local-time is set or synchronized.

SCHEDULING SECTION 4: CONFIGURATION


4.1.6 OCCUPANCY DETECTIONThe occupancy detection feature enables the NB-VAV to automatically go to occupied mode, (also calledextended occupancy) when a dedicated occupancy sensor indicates the monitored zone is not empty. Thelength of time that the NB-VAV will operate in extended occupancy is defined by the user in the OccupancyDetection:(MT) extended occupancy duration property. To configure the NB-VAV for occupancydetection capability, first select the input that you wish to use for occupancy detection using the pull-downmenu.

Next, set the (MD) extended occupancy delay property to the desired number of seconds the occupancydetector must indicate that occupancy is detected before overriding the zone. This prevents falsetriggering of occupancy detection in the event that someone or something quickly passes through thezone.

Set the (MT) extended occupancy duration property to the desired number of minutes the NB-VAV is toremain in extended occupancy once it is detected that the zone is occupied. This value must be greaterthan zero, otherwise the NB-VAV will not go into extended occupancy.

NOTEThe input selected for Occupancy Detectionmust be configured as a digital input (ST=0).

NOTEIf the (MT) extended occupancy durationproperty is not set to a value greater thanzero, the NB-VAV will not go into extendedoccupancy when it is detected that the zoneis occupied.

SECTION 4: CONFIGURATION SETTING THE TEMPERATURE AND FLOW SETPOINTS


4.2 SETTING THE TEMPERATURE AND FLOW SETPOINTSThis section provides guidelines for configuring the temperature and flow setpoints of the NB-VAV. TheNB-VAV maintains the zone according to the present-value of the Cool Setpoint and Heat Setpointobjects. These values can also be found in the Zone Temperature:(CC) current cooling setpoint andZone Temperature:(CH) current cooling setpoint properties.

To set the heating and cooling setpoints, you must enter the temperature that you want the zone tomaintain when the active schedule mode is the mode corresponding to the object. This value can beentered into the present-value property of the appropriate Setpoint object.

You also have the option to specify an unoccupied setup/setback value for both the heating and coolingsetpoints. This is the value you want subtracted from the heating setpoint and added to the coolingsetpoint when the active schedule mode is unoccupied. For example, if the setpoint is 70° and the setbackis 4°, the setpoint will be adjusted to 66° when the active schedule mode is unoccupied. To set the heatingor cooling setbacks, enter the desired setback amount in the present-value of the Heat UnoccupiedSetback or Cool Unoccupied Setback object, respectively.

You may also specify the night setup/setback value you want subtracted from the heating setpoint oradded to the cooling setpoint when the active schedule mode is Night Setback. You may specify thesetback to be applied to the heating or cooling setpoint by entered the appropriate amount in the present-value property of the Heat Night Setback or Cool Night Setback object respectively.

A warm-up setpoint may be specified for the NB-VAV. This is the temperature that you want the zone tomaintain when warm-up is the active schedule mode. To set the warm-up setpoint, enter the desired valuein the present-value property of the Warmup Setpoint object.

The NB-VAV has capabilities to control the flow during the different schedule states. The parameterswhich control this behavior are found in the Flow Setpoint object.

For cooling applications, you may specify the value of the minimum and maximum rate, measured in cfm,at which you want air to flow through the duct. by entering values into (CM) cooling minimum flow and(CX) cooling maximum flow. These set the minimum and maximum values for the Flow Control:(CD)target flow property.

The NB-VAV sets the target flow via a PID loop controlling off the temperature setpoint. There is anintegration constant, specified by the Flow Setpoints:(CI) cooling integration constant object, whichdefines the percentage of accumulated error used to calculate the required supply airflow, and aproportional band, specified by the Flow Setpoints:(CP) cooling proportional band object, whichspecifies the number of degrees over which proportional cooling will take place.

The (HM) heating minimum flow and (HX) heating maximum flow objects and the (WM) warmupminimum flow and (WX) warmup maximum flow properties in the Flow Setpoints object perform thesame functions as their cooling counterparts, setting the minimums and maximums for the heating andwarmup flows respectively.

The (HP) heating proportional band and (HI) heating integration constant properties and the (WP)warmup proportional band and (WI) warmup integration constant properties are used to define theproportional bands and integration constants to be used for heating and warmup.

SETTING THE TEMPERATURE AND FLOW SETPOINTS SECTION 4: CONFIGURATION


NOTEThe Minimum and Maximum Flowproperties should not exceed the minimumand maximum allowable rates of flowspecified by the manufacturer of the VAVterminal box.

SECTION 4: CONFIGURATION NB-VAV CONTROL MODES


4.3 NB-VAV CONTROL MODESThe NB-VAV can operate in one of five control modes: Constant Air Volume (CAV) Cooling Only Heating Only Supply Dependant [Variable Supply Temperature (VST)] Cooling with Reheat

The following subsections provide explanations of and configuration instructions for the different controlmodes of the NB-VAV.

4.3.1 CONSTANT AIR VOLUME (CAV)The NB-VAV is capable of controlling (CAV) terminal boxes. With a CAV unit, zone temperature is not acontrol factor. Instead, the value defined by the user in the Flow:Control:(CD) target flow propertybecomes the constant volume setpoint. The NB-VAV will modulate the damper appropriately to maintainthe target flow while airflow is present. Reheat capabilities are identical to VAV operation and use zonetemperature as the measured variable for control.

To configure the NB-VAV for CAV control, you must first set the Zone Temperature:(BT) application (boxtype) property to “0=CAV”. The Flow Control:(CK) duct scaling factor property is specific to the duct youare using and should be set to a value of 4005 multiplied by the area of the duct measured in square feet.

The flow should be calibrated to zero flow by setting Flow Control:(CB) calibrate flow property to 1. Afterthe present_value and (CA) average flow properties both equal zero, then you will check the controller'sCFM reading with what the balancer is reading. If they do not match, enter the balancer's reading in FlowControl:(KC) measured cfm for CK adjust. If the values still do not agree, you should adjust the damperso the CFM has changed by more than 100 CFM. You should then enter the second balancer's reading inFlow Control:(K2) measured cfm for 2pt cal. Finally, the Flow Control:(AC) auto/manual/track modeselect property should be set to “1=Auto”.

During scheduled unoccupied and night setback periods, the damper will go to the minimum position.

The properties that need to be configured for CAV operation and examples of the values that should beentered for them are given in Table 4-2.

Table 4-2 Summary of Control Settings for Constant Air Volume (CAV) Operation

Object Name Property Value Description

Zone Temperature (BT) application (box type) 0 Constant Air volume

Flow Control (CK) duct scaling factor 786 4005 x duct square feet (default 6” round)

(CB) calibrate flow 11 = calibrate flow sensor reading with no flow (will automatically return to zero)

(CD) target flow 100 Desired constant volume setpoint in CFM

NB-VAV CONTROL MODES SECTION 4: CONFIGURATION


4.3.2 SUPPLY DEPENDENT (VST)

Figure 4-1: Supply Dependant (VST) Control

When operating in supply dependant mode, the NB-VAV monitors the temperature of the source/duct air,determines whether or not the air is hot or cold enough to heat or cool the zone, then automaticallyfunctions in heating or cooling mode accordingly. This requires that the box has a supply temperaturesensor or a broadcast value from a central point. For example, if the Supply Temperature:present-value isgreater than both the Zone Temperature:present-value and the Heat Setpoint:present-value (alsodisplayed, but not editable, in the Zone Temperature:(CH) current heating setpoint object), the NB-VAVwill operate in heating mode and open the damper to provide the warm supply air to the zone (the source,or supply air is warm enough to heat the space). Conversely, if Supply Temperature:present-value is lessthan both Zone Temperature:present-value and the Cool Setpoint:present-value (also displayed, but noteditable, in the Zone Temperature:(CC) current cooling setpoint object), the NB-VAV will operate incooling mode and open the damper to provide the cool supply air to the zone (the source, or supply air iscold enough to cool the space).

Using the Supply Temperature:(DD) auto duct delta temperature property, the user can define the pointat which the terminal box will go into cooling or heating mode. For example, if (DD) auto duct deltatemperature is set to 3° and the current (temperature) setpoint is 70°:

(KC) measured cfm for CK adjust 0

For CFM calibration purpose enter actual measured CFM value.

(K2) measured cfm for 2pt cal 0

For finer CFM calibration enter actual measured CFM value but must be at least 100CFM different than KC reading

(AC) auto/manual/track mode select 1

0 = manual1 = auto2 = tracking

Table 4-2 Summary of Control Settings for Constant Air Volume (CAV) Operation


ST (supply

temperature)

CoolingMode

HeatingMode

ZT(zonetemp.)

Deadband

CH(current heating

setpoint)

CC(current cooling

setpoint)



the NB-VAV will switch to heating only mode and supply the warm source air to the zone when the sup-ply temperature exceeds 73°

the NB-VAV will switch to cooling only mode and supply the cool source air to the zone when the sup-ply temperature drops below 67°

the NB-VAV will remain in the last active mode when the temperature is in the deadband (67 to 73°)

To configure the NB-VAV for VST control, you must first set the Zone Temperature:(BT) application (boxtype) property to “3=Supply Dependent”. The mode in which the NB-VAV is operating will be indicated inthe Supply Temperature:(SM) cooling / heating supply mode property.

When in VST mode, the NB-VAV will override the minimum airflow settings to prevent undesired coolingand heating. Dampers will fully close when the supply air is not suitable for what the zone is calling.

The Flow Control:(CK) duct scaling factor property is specific to the duct you are using and should be setto a value of 4005 multiplied by the area of the duct measured in square feet.

The flow should be calibrated to zero flow by setting Flow Control:(CB) calibrate flow property to 1 whenthe fan is completely shutdown. After the present_value and (CA) average flow properties both equalzero, then you will check the controller's CFM reading with what the balancer is reading. If they do notmatch, enter the balancer's reading in Flow Control:(KC) measured cfm for CK adjust. If the values stilldo not agree, you should adjust the damper so the CFM has changed by more than 100 CFM. You shouldthen enter the second balancer's reading in Flow Control:(K2) measured cfm for 2pt cal. Finally, theFlow Control:(AC) auto/manual/track mode select property should be set to “1=Auto”.

Next, the heating and cooling setpoints for the various schedule states should be entered into thepresent_value property of the appropriate setpoint object. The NB-VAV maintains the zone according tothe present-value of the Cool Setpoint and Heat Setpoint objects. These values can also be found in theZone Temperature:(CC) current cooling setpoint and Zone Temperature:(CH) current cooling setpointproperties.


You also have the option to specify an unoccupied setup/setback value for both the heating and coolingsetpoints. This is the value you want subtracted from the heating setpoint and added to the coolingsetpoint when the active schedule mode is unoccupied. For example, if the setpoint is 70° and the setbackis 4°, the setpoint will be adjusted to 66° when the active schedule mode is unoccupied. To set the heatingor cooling setbacks, enter the desired setback amount in the present-value of the Heat UnoccupiedSetback or Cool Unoccupied Setback object, respectively.







The NB-VAV sets the target flow via a PID loop controlling off the temperature setpoint. There is anintegration constant, specified by the Flow Setpoints:(CI) cooling integration constant property, whichdefines the percentage of accumulated error used to calculate the required supply airflow, and aproportional band, specified by the Flow Setpoints:(CP) cooling proportional band property, whichspecifies the number of degrees over which proportional cooling will take place.

The (HM) heating minimum flow and (HX) heating maximum flow properties and the (WM) warmupminimum flow and (WX) warmup maximum flow properties in the Flow Setpoints object perform thesame functions as their cooling counterparts, setting the minimums and maximums for the heating andwarmup flows respectively.


The Supply Temperature:(IC) input channel property should be set to the universal input used to read thesupply temperature. The corresponding universal input should then be configured to read a thermistorinput by setting the by setting the (ST) sensor type property to a value of 7 in the corresponding UI0xobject corresponding to the input chosen.

The Supply Temperature:(DD) auto duct delta temperature specifies the number of degrees above theheating setpoint or below the cooling setpoint that the supply air temperature must be before target flowwill be changed from the minimum flow setting.


The properties that need to be configured for supply dependent (VST) operation and examples of thevalues that should be entered for them are given in Table 4-3.

NOTEThe minimum and maximum flowproperties should not exceed the minimumand maximum allowable rates of flowspecified by the manufacturer of the VAVterminal box.

Table 4-3 Summary of Control Settings for Supply Dependent (VST) Operation


Zone Temperature (BT) application (box type) 3 Supply Dependant











Cool Setpoint present_value 72.0 Zone temp VAV damper will increase CFM

Cool Unoccupied Setback present_value 5.0

Number of degrees added to cool setpoint when controller is unoccupied

Cool Night Setback present_value 5.0Number of degrees added to cool setpoint when controller is in night setback

Heat Setpoint present_value 68.0 Zone temp must drop below for heating to occur

Heat Unoccupied Setback present_value 10.0

Number of degrees subtracted from heat setpoint when controller is unoccupied

Heat Night Setback present_value 10.0Number of degrees subtracted from heat setpoint when controller is in night setback

Warmup Setpoint present_value 72 Setpoint during Warmup periods

Flow Setpoint (CM) cooling minimum flow 100 Cooling minimum CFM

(CX) cooling maximum flow 500 Cooling maximum CFM

(CP) cooling proportional band 5 Proportional band in degrees

(CI) cooling integration constant 5 Amount of proportional error in %

(0.0–25.5)





4.3.3 HEATING ONLY

Figure 4-2: Heating Only

(HM) heating minimum flow 100 Heating minimum CFM

(HX) heating maximum flow 500 Heating maximum CFM

(HP) heating proportional band 5 Proportional band in degrees

(HI) heating integration constant 5 Amount of proportional error in %

(0.0–25.5)

(WM) warmup minimum flow 100 Warmup minimum CFM

(WX) warmup maximum flow 500 Warmup maximum CFM

(WP) warmup proportional band 5 Proportional band in degrees

(WI) warmup integration constant 5 Amount of proportional error in %

(0.0–25.5)

Supply Temperature

(DD) auto duct delta temperature 2.5

Number of degrees above heating setpoint or below cooling setpoint supply air temp must be before target flow will changed from minimum CFM

(IC) input channel 1

UO0x (ST) sensor type 7 Thermistor



zonetempcooler

zonetemp

warmer

HXHeating

Max. Flow

HMHeating

Min. Flow

HPHeating

ProportionalBand

HeatingSetpoint

CH

Damper Position



When configured for heating only control, the NB-VAV uses Proportional+Integral (PI) control to modulatethe damper and control airflow to the zone based on two properties; the Zone Temperature:present-valueand the Zone Temperature:(CH) current heating setpoint. If the present-value is less than the (CH)current heating setpoint, the NB-VAV will open the damper and provide warm air to the zone to maintaina zone temperature as close as possible to the setpoint.

Heating only VAV works on a reverse acting ramp that slopes from the values defined by the user in theFlow Setpoints:(HM) heating minimum flow to the Flow Setpoints:(HX) heating maximum flowproperties. When the zone temperature strays below the current heating setpoint, the NB-VAV opens thedamper—increasing the supply airflow to the zone. As the zone temperature nears the setpoint, the NB-VAV closes the damper to minimize airflow. See Figure 4-2.

To configure the NB-VAV for heating only control, you must first set the Zone Temperature:(BT)application (box type) property to “2=Heating Only”. You must then specify the duct scaling factor bymultiplying 4005 by the effective duct area, measured in square feet, and entering the result into the FlowControl:(CK) duct scaling factor (k) property.


Next, the heating and cooling setpoints for the various schedule states should be entered into thepresent_value property of the appropriate setpoint object. The NB-VAV maintains the zone according tothe present-value Heat Setpoint objects. These values can also be found in the Zone Temperature:(CH)current cooling setpoint properties.

To set the heating setpoints, you must enter the temperature that you want the zone to maintain when theactive schedule mode is the mode corresponding to the object. This value can be entered into thepresent-value property of the appropriate Setpoint object.

You also have the option to specify an unoccupied setup/setback value for the heating setpoints. This isthe value you want subtracted from the heating setpoint when the active schedule mode is unoccupied.For example, if the setpoint is 70° and the setback is 4°, the setpoint will be adjusted to 66° when theactive schedule mode is unoccupied. To set the heating setback, enter the desired setback amount in thepresent-value of the Heat Unoccupied Setback object.

You may specify a night setup/setback value you want subtracted from the heating setpoint when theactive schedule mode is Night Setback. You may specify the setback to be applied to the heating setpointby entered the appropriate amount in the present-value property of the Heat Night Setback object.





You may specify the value of the minimum and maximum desired rate, measured in cfm, at which youwant air to flow through the duct. by entering values into (HM) heating minimum flow and (HX) heatingmaximum flow. These set the minimum and maximum values for the Flow Control:(CD) target flowproperty.

The NB-VAV sets the target flow via a PID loop controlling off the temperature setpoint. There is anintegration constant, specified by the Flow Setpoints:(HI) heating integration constant property, whichdefines the percentage of accumulated error used to calculate the required supply airflow, and aproportional band, specified by the Flow Setpoints:(HP) heating proportional band property, whichspecifies the number of degrees over which proportional cooling will take place.

The (WM) warmup minimum flow and (WX) warmup maximum flow properties in the Flow Setpointsobject perform the same functions as their heating counterparts, setting the minimums and maximums forthe flow during scheduled warmup periods. Similarly, the (WP) warmup proportional band and (WI)warmup integration constant properties are used to define the proportional bands and integrationconstants to be used during this period.

The properties that need to be configured for heating only operation and examples of the values thatshould be entered for them are given in Table 4-4.

NOTEThe minimum flow and maximum flowproperties should not exceed the minimumand maximum allowable rates of flowspecified by the manufacturer of the VAVterminal box.

Table 4-4 Summary of Control Settings for Heating Only Operation


Zone Temperature (BT) application (box type) 2 Heating Only












Heat unoccupied Setback present_value 10.0


Heat night setback present_value 10.0Number of degrees subtracted from heat setpoint when controller is in night setback


Flow Setpoint (HM) heating minimum flow 100 Heating minimum CFM




(0.0–25.5)





(0.0–25.5)

Table 4-4 Summary of Control Settings for Heating Only Operation




4.3.4 COOLING ONLY

Figure 4-3: Cooling Only

When configured for cooling only control, the NB-VAV uses PI control to modulate the damper and controlairflow to the zone based on two factors; the Zone Temperature:present-value and the ZoneTemperature:(CC) current cooling setpoint. If the zone temperature is greater than the setpoint, the NB-VAV will open the damper and provide cool air to the zone to maintain the zone temperature as close tothe setpoint as possible.

Cooling only VAV works on a normal acting ramp that slopes from the values defined by the user in theFlow Setpoints:(CM) cooling minimum flow to the Flow Setpoints:(CX) cooling maximum flowproperties. When the zone temperature strays above the current cooling setpoint, the NB-VAV opens thedamper—increasing the supply airflow to the zone. As the zone temperature nears the setpoint, the NB-VAV closes the damper to minimize airflow.

To configure the NB-VAV for cooling only control, you must first set the Zone Temperature:(BT)application (box type) property to “1=Cooling Only”. You must then specify the duct scaling factor bymultiplying 4005 by the effective duct area, measured in square feet, and entering the result into the FlowControl:(CK) duct scaling factor (k) property. Cooling and flow setpoints would then be set as describedin Section 4.2.

The Flow Control:(CK) duct scaling factor property is specific to the duct you are using and should be setto a value of 4005 multiplied by the area of the duct measured in square feet.


Next, the heating and cooling setpoints for the various schedule states should be entered into thepresent_value property of the appropriate setpoint object. The NB-VAV maintains the zone according to

CPcooling proportional

bandCX

coolingmax flow

CMcoolingmin flow

temp(warmer)

temp(cooler)

DamperPosition

CCcoolingsetpoint

zone zone



the present-value of the Cool Setpoint objects. The current setpoint can also be found in the ZoneTemperature:(CC) current cooling setpoint property.

To set the cooling setpoints, you must enter the temperature that you want the zone to maintain when theactive schedule mode is the mode corresponding to the object. This value can be entered into thepresent-value property of the appropriate Setpoint object.

You also have the option to specify an unoccupied setup/setback value for the cooling setpoint. This is thevalue you want added to the cooling setpoint when the active schedule mode is unoccupied. For example,if the setpoint is 70° and the setback is 4°, the setpoint will be adjusted to 74° when the active schedulemode is unoccupied. To set the cooling setback, enter the desired setback amount in the present-valueof the Cool Unoccupied Setback object.

You may also specify the night setup/setback value you want added to the cooling setpoint when the activeschedule mode is Night Setback. You specify the setback to be applied to the cooling setpoint by enteringthe appropriate amount in the present-value property of the Cool Night Setback object.

You may specify the value of the minimum and maximum rate, measured in cfm, at which you want air toflow through the duct. by entering values into (CM) cooling minimum flow and (CX) cooling maximumflow. These set the minimum and maximum values for the Flow Control:(CD) target flow property.


The properties that need to be configured for heating only operation and examples of the values thatshould be entered for them are given in Table 4-5.


Table 4-5 Summary of Control Settings for Cooling Only Operation


Zone Temperature (BT) application (box type) 1 Cooling Only












Cool unoccupied Setback present_value 5.0


Cool night setback present_value 5.0Number of degrees added to cool setpoint when controller is in night setback





(0.0–25.5)

Table 4-5 Summary of Control Settings for Cooling Only Operation




4.3.5 COOLING WITH REHEAT

Figure 4-4: Cooling with Reheat

Cooling with reheat control uses the VAV box damper to let in cool supply air while providing any neededheating through up to four stages of electric reheat.

The NB-VAV will maintain the cooling setpoint specified in the Zone Temperature:(CC) current coolingsetpoint property by providing supply air through proportional damper positioning. With its PI algorithm,the NB-VAV will modulate the damper to maintain the Zone Temperature:present-value between thecurrent cooling setpoint and the current heating setpoint specified in the Zone Temperature:(CH) currentheating setpoint property. The reheat stages will energize at the time interval defined by the user in theElectric Reheat:(ID) interstage delay time property until the zone temperature reaches the coolingsetpoint. Reheat stages de-energize at thirty-second intervals.

To configure the NB-VAV for cooling with reheat control, you must first set the Zone Temperature:(BT)application (box type) property to “4=Cooling w/Reheat”. You must then specify the duct scaling factorby multiplying 4005 by the effective duct area, measured in square feet, and entering the result into theFlow Control:(CK) duct scaling factor (k) property.


Next, the heating and cooling setpoints for the various schedule states should be entered into thepresent_value property of the appropriate setpoint object. The NB-VAV maintains the zone according tothe present-value of the Cool Setpoint and Heat Setpoint objects. These values can also be found in the

HeatingProportional

Band

0%Open

100%

Open

HeatingSetpoint

CoolingProportional

Band

Min.Flow

Max.Flow

CoolingSetpoint

Airflow

Deadband

ZONE TEMPERATUREcooler warmer

HeatingFlow



Zone Temperature:(CC) current cooling setpoint and Zone Temperature:(CH) current coolingsetpoint properties.


You also have the option to specify an unoccupied setup/setback value for both the heating and coolingsetpoints. This is the value you want subtracted from the heating setpoint and added to the coolingsetpoint when the active schedule mode is unoccupied. For example, if the heating setpoint is 70° and thesetback is 4°, the setpoint will be adjusted to 66° when the active schedule mode is unoccupied. To setthe heating or cooling setbacks, enter the desired setback amount in the present-value of the HeatUnoccupied Setback or Cool Unoccupied Setback object, respectively.










WIth the temperature and flow setpoints configured, you must then configure the properties in the ElectricReheat object.

You indicate which outputs you wish to use as heating stages by specifying the desired reheat mode. Thisis chosen by selecting one of the options listed in Table 4-6 in the Electric Reheat:(RO) reheat applicationproperty

The NB-VAV can prolong the life of reheats through its (BA) reheat balance mode property. With thisproperty enabled, reheat stages with less run time will energize first. If you wish to balance stage usage,you should set BA to 1.

You may specify which stages to require a positive flow indication by using the (FR) stages requiring flowproperty. FR is a bit map with each bit corresponding to a digital output. To require positive flow indicationfor an output, you must set the appropriate bit in FR to 1.

The (AF) require max airflow property determines whether the specified maximum airflow must beachieved before stages are energized. By default AF is set to 0 and maximum flow is not required forstages to energize.

The NB-VAV allows you to specify the number of minutes you want to expire before the additional stagesare energized. To set the delay, enter the desired number of minutes in the Electric Reheat:(ID)interstage delay time property.

The (MX) max supply temp property specifies the maximum operating temperature for the stages. If thetemperature reading exceeds this value the stages will be de-energized. MX must be set to a value of999.0 is no reliable supply air temperature reading is available.


Table 4-6 : Reheat Options

Value Reheat Option

0 Disabled

1 2-Stage (K2-K3)

2 2-Stage (K4-K5)

3 4-Stage (K2-K5)



The temperature at which the first reheat stage will be energized is specified as an offset from the heatingsetpoint. The (OF) reheat offset property specifies the number of degrees the temperature must dropbelow the heating setpoint before the first stage is energized.


The properties that need to be configured for cooling with reheat operation and examples of the valuesthat should be entered for them are given in Table 4-7.

Table 4-7 Summary of Control Settings for Cooling with Reheat Operation


Zone Temperature (BT) application (box type) 4 Cooling w/reheat










Cool unoccupied Setback present_value 5.0


Cool night setback present_value 5.0Number of degrees added to cool setpoint when controller is in night setback


Heat unoccupied Setback present_value 10.0


Heat night setback present_value 10.0Number of degrees subtracted from heat setpoint when controller is in night setback








(0.0–25.5)



Electric Reheat (AF) require max air flow 0

0 = Max CFM is not required for stages to energize1 = Max CFM is required before stages energize

(BA) reheat balance mode 00 = No balancing of stage1 = Stages with lowest usage energized first

(FR) stages requiring flow 3

15 = K2, K3, K4 & K5 require flow12 = K4 & K5 require flow 3 = K2 & K3 require flow 0 = Stages do not required flow

(ID) interstage delay time 4.0 Time delay in minutes before the next stage will energize

(MX) max supply temp 105.0

If supply temperature is equal to or greater than stages are de-energized. (Must be 999.0 if no supply temp and unreliable)

(OF) reheat offset 1.5Number of degrees below heating setpoint 1st stage of reheat will energize

(RO) reheat application 1

0 = Disabled1 = Two-stage (K2-K3)2 = Two-stage (K4-K5)3 = Four-stage (K2, K3, K4, & K5)

Table 4-7 Summary of Control Settings for Cooling with Reheat Operation


AUXILIARY FUNCTIONS SECTION 4: CONFIGURATION


4.4 AUXILIARY FUNCTIONS

4.4.1 SERIES FANIn series fan applications, the fan output is energized when the active schedule mode is either occupied orwarm-up. When the active schedule mode is unoccupied, the fan is temperature-controlled, unless theBO01:(FO) fan/damper application property is set to “0=Always On”. When the active schedule mode isunoccupied or night setback, the series fan remains off unless the Zone Temperature:present-valuevaries beyond the limits of the control deadband.

To configure the NB-VAV for series fan operation, you should first set the BO01:(FO) fan/damperapplication property to “1=Series Fan”. Then you must specify the desired operation mode when theactive schedule mode is unoccupied or night setback. This is done by setting the BO01:(SF) fan modeproperty to “0=Always On” or “1=Off in Deadband”.

The NB-VAV can be set to prevents short cycling of the fan output. To enable this option, enter thenumber of minutes you want the fan output to stay energized/de-energized in the BO01:(FC) min cycletime property.

4.4.2 PARALLEL FANWhen the BO01:(FO) fan/damper application property is set to “2=Parallel Fan”, the parallel fan isenergized when the active schedule mode is occupied and Flow:Control:present-value is less than theBO01:(FS) fan setpoint property. If the fan setpoint is equal to zero, the fan is energized when ZoneTemperature:present-value is less than Zone Temperature:(CH) current heating setpoint.

To protect the output, a minimum cycle time may be entered into the (FC) min cycle time property.

Table 4-8 Summary of Control Settings for Series Fan Operation


BO0x (FO) fan/damper application 1 Series fan

(SF) fan mode 1 0 = Always on1 = Off in deadband

(FC) min cycle time 2.0 Minimum time fan will be ON and OFF

Table 4-9 Summary of Control Settings for Parallel Fan Operation


BO0x (FO) fan/damper application 2 Parallel fan

(FS) fan setpoint 0 Parallel fan energizes when average CFM is below this value


SECTION 4: CONFIGURATION AUXILIARY FUNCTIONS


4.4.3 INDUCTION DAMPERThe NB-VAV can be configured to control an induction damper. The induction damper opens when thecurrent airflow falls below preset minimum values for the heating cooling and warmup flow set in the FlowSetpoints object. The induction damper closes when the current airflow rises above the maximum valuesalso specified in the Flow Setpoints object. To configure the NB-VAV for operation of an induction damper,set the BO01:(FO) fan/damper application mode property to “3=Induction Damper”.

The (FS) fan setpoint property specifies the flow value below which the induction damper will open.

To protect the output, a minimum cycle time may be entered into the (FC) min cycle time property.

4.4.4 VALVE CONTROL

Figure 4-5 Valve Ramps

Table 4-10 Summary of Control Settings for Parallel Fan Operation


BO0x (FO) fan/damper application 3 Induction Damper

(FS) fan setpoint 0 Induction damper opens when average CFM is below this value


VPchill water valve

proportional band

ValvePosition

maximumvalve

position

higher

temp

VPhot water valve

proportional bandmaximum

valveposition

lowerzone

ValvePosition

damper control CH minus valve control VO

norm

al a

ctin

g ra

mpreverse acting ram

p

damper control CC plus valve control VO

tempzone



There are two types of valve control provided by the NB-VAV: pulse width modulated control and floatingsetpoint control. The NB-VAV uses its PI algorithm to calculate the percent of control needed for pulsewidth driven motor valves. 4.4.4.1 CONFIGURATION FOR PWM VALVE CONTROL

To configure the NB-VAV for pulse width modulation the (VM) valve mode property must be set to“0=Pulse Width Modulation”.

The (AM) auto/manual flag property should be set to “1=auto” to indicate that the controller shouldautomatically control the valve.

The (VU) valve use property determines the control mode for the valve. To select a use, enter one of thevalues found in Table 4-11 for this property.

NOTEUsing the Valve Ctrl1 and Valve Ctrl 2objects precludes the use of reheats. ValveCtrl 1 uses BO02 and BO03 and Valve Ctrl 2uses BO04 and BO05.

NOTEValve Ctrl 2 is only available on the NB-VAVmodels with relay outputs (the NB-VAVra,and NB-VAVrf).

NOTEThe NB-VAVra, and NB-VAVrf should not beused for PWM control. AAM recommendsonly NB-VAV controllers with triac outputs(NB-VAVta and NB-VAVtf) be used for PWMcontrol.

Table 4-11 : Valve Use Options

Value Valve Use Option

0 Disabled



The user-defined value in the (VO) valve temp offset property is added to the current cooling setpoint orsubtracted from the current heating setpoint for calculation of the loop setpoint.

For hot water reheat operations, the valve operates in a reverse acting ramp. As the zone temperature fallsbelow the current heating setpoint, the valve begins to open. As the zone temperature rises, the valve willbegin to close.

In chilled water applications, the valve operates in a normal acting ramp. As the zone temperature risesabove current cooling setpoint, the valve begins to open. As the temperature falls below the currentcooling setpoint, the valve begins to close.

The (VP) valve proportional band property specifies the input variable range, in degrees (0.0 to 25.5),over which the output value is proportional to the error value. The proportional band is offset from thesetpoint for the loop.

The (VI) valve integration constant property shows the amount of proportional error history (0 to 25.5%)used to calculate the desired position for the valve and to create an accumulated integral sum. Thisintegral sum, applied once per minute, is used to control overshoot while the loop is operating within theconfines of the proportional band.

The (PP) pwm period property specifies the number of seconds from the time the relay is energizedbefore it can be energized again.

HIgh and low temperature lockouts are specified using the (TH) high temp lockout and (TL) low templockout properties. If the controller is in heating mode and the supply temperature exceeds TH, then thevalve will be closed. Similarly, the valve will be closed if he controller is in cooling mode and the supplytemperature drops below TH. If no reliable supply temperature is available, these properties should be setto a value of 999.0 to disable their functioning.

The (VP) valve proportional band and (VI) valve integration constant specify the proportional band andintegration constant used in the PID algorithm which controls the valve.

Next, the heating setpoints for the various schedule states should be entered into the present_valueproperty of the appropriate setpoint object.


You also have the option to specify an unoccupied setup/setback value for the heating setpoints. This isthe value you want subtracted from the heating setpoint when the active schedule mode is unoccupied.For example, if the setpoint is 70° and the setback is 4°, the setpoint will be adjusted to 66° when theactive schedule mode is unoccupied. To set the heating setback, enter the desired setback amount in thepresent-value of the Heat Unoccupied Setback object.

1 Cooling

2 Heating





You may also specify the night setup/setback value you want subtracted from the heating setpoint whenthe active schedule mode is Night Setback. You may specify the setback to be applied to the heatingsetpoint by entered the appropriate amount in the present-value property of the Heat Night Setbackobject.


The Proof of Flow:(DR) method to determine flow property should be set to “0=None”.

Finally, the Supply Temperature:(IC) input channel property should be set to the appropriate input for thesupply air temperature sensor. You should also confirm that the (ST) sensor type property for that inputhas been correctly configured.

Table 4-12 Summary of Control Settings for PWM Valve Control Operation


Valve Ctrl 1 or 2 (AM) auto/manual flag 1 0 = manual1 = auto

(PP) pwm period 20Total time in seconds from time relay is energized until it is energized again

(TH) high temp lockout 105.0

If supply temperature is equal to or greater than valve is closed in heat mode. (Must be 999.0 if no supply temp and unreliable)

(TL) low temp lockout 45.0

If supply temperature is equal to or less than valve is closed in cool mode. (Must be 999.0 if no supply temp and unreliable)

(VI) valve integration constant 20 Amount of proportional error in % (0.0–25.5)

(VM) valve mode 0 Pulse with modulation

(VP) valve proportional band 45 Proportional band in degrees

(VU) valve mode 20 = disable1 = cooling2 = heating


Heat Unoccupied Setup/Setback present_value 10.0




4.4.4.2 BASIC CONFIGURATION FOR FLOATING SETPOINT VALVE CONTROLTo configure the NB-VAV for floating setpoint valve control, you must set the (VM) valve mode property inthe associated Valve Ctrl object to “1=Floating Point Motor Control”. Then, you must disable the proof offlow sensors by setting the Proof of Flow:(DR) method to determine flow property to “0=None”.

The (AM) auto/manual flag property should be set to “1=auto” to indicate that the controller shouldautomatically control the valve.

The (VU) valve use property determines the control mode for the valve. To select a use, enter one of thevalues found in Table 4-13 for this property.

The user-defined value in the (VO) valve temp offset property is added to the current cooling setpoint orsubtracted from the current heating setpoint for calculation of the loop setpoint.

For hot water reheat operations, the valve operates in a reverse acting ramp. As the zone temperature fallsbelow the current heating setpoint, the valve begins to open. As the zone temperature rises, the valve willbegin to close.

In chilled water applications, the valve operates in a normal acting ramp. As the zone temperature risesabove current cooling setpoint, the valve begins to open. As the temperature falls below the currentcooling setpoint, the valve begins to close.

Heat Night Setup/Setback present_value 10.0

Number of degrees subtracted from heat setpoint when controller is in night setback


Supply Temperature (IC) input channel 1 1 = UI1

2 = UI2

UI0x (ST) sensor type 7

0 = digital2 = linear3 = 4-20ma7 = thermistor

Proof of Flow (DR) method to determine flow 0

0 = none (PF=1)1 = minimum flow2 = digital input3 = both



0 Disabled

1 Cooling

2 Heating

Table 4-12 Summary of Control Settings for PWM Valve Control Operation




The (VP) valve proportional band property specifies the input variable range, in degrees (0.0 to 25.5),over which the output value is proportional to the error value. The proportional band is offset from thesetpoint for the loop.

The (VI) valve integration constant property shows the amount of proportional error history (0 to 25.5%)used to calculate the desired position for the valve and to create an accumulated integral sum. Thisintegral sum, applied once per minute, is used to control overshoot while the loop is operating within theconfines of the proportional band.

HIgh and low temperature lockouts are specified using the (TH) high temp lockout and (TL) low templockout properties. If the controller is in heating mode and the supply temperature exceeds TH, then thevalve will be closed. Similarly, the valve will be closed if he controller is in cooling mode and the supplytemperature drops below TH. If no reliable supply temperature is available, these properties should be setto a value of 999.0 to disable their functioning.

The (VP) valve proportional band and (VI) valve integration constant specify the proportional bandand integration constant used in the PID algorithm which controls the valve.

The (VT) recalb with new value property is used to set the number of seconds it takes for the valve to gofrom fully open to fully closed. This value should be found in the valve manufacturer’s literature.


You also have the option to specify an unoccupied setup/setback value for the heating and coolingsetpoints. These are the values you want subtracted from the heating setpoint or added to the coolingsetpoint when the active schedule mode is unoccupied. For example, if the heating setpoint is 70° and thesetback is 4°, the setpoint will be adjusted to 66° when the active schedule mode is unoccupied. To setthe setup/setback, enter the desired setback amounts in the present-value of the Heat UnoccupiedSetup/Setback and Cool Unoccupied Setup/Setback object.

You may also specify the night setup/setback value you want subtracted from the heating setpoint oradded to the cooling setpoint when the active schedule mode is Night Setback. You may specify thesetback to be applied to the heating setpoint by entered the appropriate amount in the present-valueproperty of the Heat Night Setup/Setback object.





Table 4-14 Summary of Control Settings for Floating Point Valve Control Operation


Valve Ctrl 1 or 2 (AM) auto/manual flag 1 0 = manual1 = auto

(TH) high temp lockout 105.0

If supply temperature is equal to or greater than valve is closed in heat mode. (Must be 999.0 if no supply temp and unreliable)

(TL) low temp lockout 45.0

If supply temperature is equal to or less than valve is closed in cool mode. (Must be 999.0 if no supply temp and unreliable)

(VI) valve integration constant 20 Amount of proportional error in % (0.0–25.5)

(VM) valve mode 1 Floating Point Motor Control

(VP) valve proportional band 45 Proportional band in degrees

(VT) recalb with new value 180

The time in seconds it takes the valve to go from fully closed to fully open or fully open to fully close which ever is longer.

(VU) valve mode 20 = disable1 = cooling2 = heating


Cool Unoccupied Setup/Setback present_value 5.0


Cool Night Setup/Setback present_value 5.0

Number of degrees added to cool setpoint when controller is in night setback









Supply Temperature (IC) input channel 2 1 = UI1

2 = UI2

UI0x (ST) sensor type 7


Proof of Flow (DR) method to determine flow 0

0 = none (PF=1)1 = minimum flow2 = digital input3 = both

Table 4-14 Summary of Control Settings for Floating Point Valve Control Operation


SECTION 4: CONFIGURATION DIGITAL OUTPUTS


4.5 DIGITAL OUTPUTSThe Digital outputs on the NB-VAV support normal or reverse polarity operation. The desired outputpolarity is chosen by setting the polarity property to 0 for normal operation or 1 for reverse polarity.

Each digital output supports runtime alarming. The total runtime hours is stored in the (RH) run hoursproperty. When the run hours for the output exceed the runtime limit, specified in the (RL) run limitproperty, the NB-VAV will generate a runtime limit alarm.

DUAL DUCT APPLICATION SECTION 4: CONFIGURATION


4.6 DUAL DUCT APPLICATION

The NB-VAVrf can be configured to provide control for dual duct applications. For this type of applicationyou must connect the internal feedback actuator to the hot duct, and the external actuator to the cold duct.The external actuator must be connected to an external power supply and Relays 4 and 5 (K4 and K5) onthe controller. Refer to Section 2, Wiring and Installation for additional information on wiring an externalactuator.

The flow sensor must be connected to pitot tubes located after the hot and cold duct junction.

To configure the NB-VAVrf for dual duct applications, you must set the Zone Temperature:(BT) application(box type) property to “3=Supply Dependent”. You must also specify the actuator type by setting the FlowControl:(AT) actuator type property to “0=LM-24M (MMT)”. For dual duct operation, the (DC) dampercontrol mode property should be set to “2=Dual Mixed (CAV”.

The maximum airflow through the hot duct is specified in the Flow Control:(EF) estimated flow at fullopen property and the target flow is specified in the Flow Control:(CD) target flow property These valuesspecify the parameters used to control the dual duct system.



You also have the option to specify an unoccupied setup/setback value for the heating and coolingsetpoints. This is the value you want subtracted from the heating setpoint or added to the cooling setpointwhen the active schedule mode is unoccupied. For example, if the heating setpoint is 70° and the setbackis 4°, the setpoint will be adjusted to 66° when the active schedule mode is unoccupied. To set thesetback, enter the desired setback amount in the present-value of the Heat Unoccupied Setup/Setback orthe Cool Unoccupied Setup/Setback object.

You may specify a night setup/setback value you want subtracted from the heating setpoint or added to thecooling setpoint when the active schedule mode is Night Setback. You may specify the setback to beapplied to the setpoints by entering the appropriate amount in the present-value property of the HeatNight Setup/Setback and the Cool Nigh Setup/Setback the object.

NOTEOnly the NB-VAVrf can be used for dual ductapplications.

SECTION 4: CONFIGURATION DUAL DUCT APPLICATION









Table 4-15 Summary of Control Settings for Dual Duct Operation


Zone Temperature (BT) application (box type) 3 Supply Dependant (VST)

Flow Control (CK) duct scaling factor 786 4005 x duct square feet (common duct) (default 6” round)


DUAL DUCT APPLICATION SECTION 4: CONFIGURATION








(AT) actuator type 0

0 = LM-24M (MMT)1 = Generic DC2 = Generic AC (K4-5)3 = None

(CD) target flow 500 CAV in CFM from both Hot/Cold decks

(DC) damper control mode 20 = Pressure Dependant1 = Measured Flow2 = Dual Mixed (CAV)

(EF) estimated flow at full open 700 Hot deck box only


Cool Unoccupied Setup/Setback present_value 5.0


Cool Night Setup/Setback present_value 5.0

Number of degrees added to cool setpoint when controller is in night setback

Heat Setpoint present_value 71.0Zone temp must drop below for hot deck damper to modulate toward HX








SECTION 4: CONFIGURATION DUAL DUCT APPLICATION


Flow Setpoint (CP) cooling proportional band 5 Proportional band in degrees


(0.0–25.5)





(0.0–25.5)





(0.0–25.5)

Supply Temperature (IC) input channel 2

1 = UI1 (Supply Air Temp to Hot Deck Box)2 = UI2

UI2 (ST) sensor type 7




TRACKING SECTION 4: CONFIGURATION


4.7 TRACKINGThe NB-VAV can be configured as a slave and used to “track” the Average Flow of another NB-VAV whichis configured as a master. The Target Flow of the slave NB-VAV will then be derived from the AverageFlow (Flow Control:(CA) average flow) of the master and the user-defined Flow Offset (Flow Control:(OFflow offset) of the slave.

To configure the NB-VAV to operate as a slave, set the Zone Temperature:(BM) ssb bus mode to“1=Slave Bus Mode”.


Then, you must specify the flow (in CFM) that you want added to/subtracted from the master controller’saverage flow when determining the slave unit’s Target Flow (Flow Control:(CD) target flow). This value isentered into the Flow Control:(OF) offset property. You must also set the Flow Control:(AC) auto/manual/tack mode select property to “2=Tracking”.

Table 4-16 Summary of Control Settings for Tracking Operation


Zone Temperature (BM) ssb bus mode 1 Slave Bus Mode

Flow Control (CK) duct scaling factor 786 4005 x duct square feet (common duct) (default 6” round)








(OF) flow offset 0

Enter the value (in CFM) you want added to/subtracted from the master controller’s Average Flow (CA) to determine the Slave’s Target Flow (CD)

SECTION 4: CONFIGURATION INDOOR AIR QUALITY


4.8 INDOOR AIR QUALITYThe NB-VAVta-IAQ and NB-VAVtf-IAQ are capable of providing Indoor Air Quality (IAQ) control basedupon space Carbon Dioxide (CO2) levels. The IAQ VAV monitors space CO2 levels and upon thedetection of high CO2 levels, initiates the IAQ control and overrides the normal temperature controlsequence. The IAQ control gradually opens the damper to a predefined airflow setpoint in order to dilutethe high space CO2 levels. In this application, it is assumed that the Air Handling Unit providing supply airto the VAV unit monitors CO2 levels in the building and adjust its air mixture accordingly.

On the controller, the CO2 sensor must be connected to the dedicated input, Universal Input 3 (UI3). UI3is only intended for a CO2 sensor and is capable of accepting sensor types: current (0-20 mA), resistance(0-1MW), or voltage (0-10VDC).

NOTEIndoor Air Quality control will not operate in Dual Duct applications.

Table 4-17: Indoor Air Quality Settings Example


Flow Control (DP) damper position 0 0 = automatic damper mode. The Indoor Air Quality application will operate only when the damper mod is automatic

Flow Setpoints (AS) air quality setpoint 700 For your applications, enter the desired CO2 level for the zone in PPM

(DB) air quality deadband

50 For your application, enter the desired CO2 control deadband in PPM)

(AM) air quality max air flow

400 For your application, enter the maximum allowed air flow in CFM.

(RP) air quality control damper ramp rate

10 For your application, enter the desired ramp rate for damper control in percent-per-minute.

INDOOR AIR QUALITY SECTION 4: CONFIGURATION


Using the (AS) air quality setpoint and the (DB) air quality deadband properties, the user defines whenIAQ control overrides the normal temperature control. This occurs when the CO2 level, as sensed byUI03’s present-value, rises above the combined level of AS and DB. While in IAQ control, the dampercontinues to open at a rate as determined by the (RP) air quailty control damper ramp rate until theairflow reaches the maximum setpoint. The normal temperature control resumes when the CO2 levelagain equals AS minus DB.

Figure 4-6 Indoor Air Quality Diagram

The Maximum Airflow allowed when in IAQ control is dependant upon the current mode of the VAVcontroller. The following table indicates what the maximum airflow setpoint is if IAQ override occurs ineach mode:

*Maximum Air Flow Setpoint is determined by the lower setpoint

Table 4-18: Air Flow Control with IAQ Control Enabled

Current Mode Maximum Air Flow Setpoint

Venting IAQ Max Air Flow

Heating IAQ Max Air Flow or Heating Max Air Flow*

Cooling IAQ Max AirFlow or Cooling Max Air Flow*

Warmup IAQ Max Air Flow or Warmup Max Air FLow*


IN THIS SECTIONTemperature Display ................................................................................................................................................ 5-3Setpoint Adjustment Display .................................................................................................................................... 5-4 SBC-STAT2......................................................................................................................................................... 5-4 SBC-STAT2-D ..................................................................................................................................................... 5-4 SBC-STAT3......................................................................................................................................................... 5-4Calculated Setpoint Display ..................................................................................................................................... 5-5LED .......................................................................................................................................................................... 5-6Override Mode ......................................................................................................................................................... 5-7Menu Actions ........................................................................................................................................................... 5-8 Enable/Disable Values ........................................................................................................................................ 5-8 Setting Values ..................................................................................................................................................... 5-8SBC-STAT3 Menus .................................................................................................................................................. 5-9 User Menu .......................................................................................................................................................... 5-9 Install Menu....................................................................................................................................................... 5-10 Balance Menu ....................................................................................................................................................5-11 Service Menu .................................................................................................................................................... 5-15

SECTION 5: SBC-STAT FEATURES

SBC-STATs use information from a connected NB controller. The SBC-STAT3 displays this information onits graphical display and gives the user the ability to navigate through the menus using its four buttons. Thefollowing section describes the SBC-STAT setpoint adjustment and LED, and the SBC-STAT3 menuswhen connected to an NB-VAV.

SECTION 5: SBC-STAT FEATURES


SECTION 5: SBC-STAT FEATURES TEMPERATURE DISPLAY


5.1 TEMPERATURE DISPLAYWhen connected to an NB-VAV, an SBC-STAT3 displays the room temperature (in degrees Celsius orFahrenheit) with Warm-up, Setback, Occupied, or Unoccupied on the bottom left of the display. AlsoHeat, Cool, or Vent is displayed on the bottom right of the display.

Figure 5-1: Room Temperature Display

78.5°FCOOLOCCUPIED

SETPOINT ADJUSTMENT DISPLAY SECTION 5: SBC-STAT FEATURES


5.2 SETPOINT ADJUSTMENT DISPLAYWhen you press the up or down arrow button on the SBC-STAT3, a setpoint adjustment display appearsand the LED blinks.

Figure 5-2: Setpoint Adjustment Display

5.2.1 SBC-STAT2 When the up or down arrow button is first pressed, the LED will flash to indicate the current setpoint. If theup or down arrow is pressed again within 15 seconds the setpoint will change one position and the redLED will flash for that setpoint. The setpoint range is one (1) through five (5) flashes. Each additional flashindicates a warmer setting. See Table 5-2 LED for more information on the blinking pattern for setpointadjustment.

5.2.2 SBC-STAT2-DWhen the up or down arrow button is first pressed, the LED will flash to indicate the current setpoint. If theup or down arrow is pressed again within 15 seconds the setpoint will change one position and the redLED will flash for that setpoint. The setpoint can be adjusted five increments on either side of zero withzero being six (6) red flashes. See Table 5-2 LED for more information on the blinking pattern for setpointadjustment.

5.2.3 SBC-STAT3When the up or down arrow button is first pressed, the current setpoint offset will be displayed on thegraphical display. If the button is pressed again within 15 seconds, the setpoint will move one increment inthe direction of the button pressed. The setpoint can be adjusted five increments on either side of zero withzero being six (6) red flashes. The magnitude of the increment is programmed at installation.

0.5°FCool

+Warm

SECTION 5: SBC-STAT FEATURES CALCULATED SETPOINT DISPLAY


5.3 CALCULATED SETPOINT DISPLAYIn version 4.00 firmware or greater, the NB-VAV(r/t/a/f) allows users to choose a method of setpoint displayon an SBC-STAT3 when a user adjusts the zone setpoint. Four options are availble for setpoint displayedand are outlined in Table 5-1

Table 5-1: Calculated Setpoint Display Options

Object and Property Value Setpoint Display

Zone Temperature:(SD) Calculated Setpoint Display

0 Standard Offset (+/- 2.5)

1 Zone Midpoint (Zone Temperature:(ZS)Zone Midpoint)

2 Heating Setpoint (Zone Temperature:(CH)Heating Setpoint)

3 Cooling Setpoint (Zone Temperature:(CC)Cooling Setpoint)

LED SECTION 5: SBC-STAT FEATURES


5.4 LEDThe following table lists the blinking patterns that occur during specific events in the SBC-STAT.

Table 5-2 LED

Event SBC-STAT2 flash SBC-STAT2-D flash SBC-STAT3 flash

Setpoint adjustment

coldest=1 red flashcolder=2 red flashesnormal=3 red flasheswarmer=4 red flasheswarmest=5 red flashes

coldest=1 red flash =2 red flashes =3 red flashes =4 red flashes =5 red flashesnormal =6 red flashes =7 red flashes =8 red flashes =9 red flashes =10 red flasheswarmest =11 red flashes

coldest =1 red flash =2 red flashes =3 red flashes =4 red flashes =5 red flashesnormal =6 red flashes =7 red flashes =8 red flashes =9 red flashes =10 red flasheswarmest =11 red flashes

Override mode red flash every 6 seconds red flash every 6 seconds no flash

Occupied mode no flash solid green solid green

Warm-up no flash flashing green flashing green

Night Setback no flash periodic yellow flash periodic yellow flash

Unoccupied mode no flash periodic yellow flash periodic yellow flash

Menus no flash no flash solid yellow

SECTION 5: SBC-STAT FEATURES OVERRIDE MODE


5.5 OVERRIDE MODE

Override mode is activated once an end-user presses any key on the SBC-STAT. Once in override mode,the LED will flash red every six seconds. To cancel override mode hold down the up or down arrow buttonfor five seconds or until the LED starts flashing. The LED will flash a minimum of ten times to confirm thecancellation.

Override mode begins when any button on the SBC-STAT3 is pressed. Refer to Section 5.7.1.

NOTEUsers can not enter override mode throughan SBC-STAT unless the following criteriaare met:

The NB-VAV’s Override (SE) propertyin the Zone Temperature object isenabled;

The Extended Occupancy Time (ED)attribute is greater than or equal to 1;and

The active schedule mode is warm-up,unoccupied, or night setback.

MENU ACTIONS SECTION 5: SBC-STAT FEATURES


5.6 MENU ACTIONSWhen you enter a menu you can enable/disable or set/edit a value. Sections 5.6.1 and 5.6.2 describe howto perform these actions.

5.6.1 ENABLE/DISABLE VALUESAfter entering a menu, use the up and down arrows to highlight a selection, then press the button toinitiate an action or enable/disable a function. Press the button to exit and return to the previous menu.Refer to Section 5.7 for more information about the SBC-STAT3 menus.

5.6.2 SETTING VALUESOptions in the Install, Balance, and Service menus allow values to be set. Selecting one of these optionsopens an Edit screen allowing you to use the button to move places to the right and the and buttons to change values. Once you have entered a desired value, press to highlight and press oncemore to store the value and return to the previous menu. To exit the Edit screen without saving anychanges, press .

NOTEOnly one action per menu can be enabled atany time. To disable an action highlight theaction and press .

SECTION 5: SBC-STAT FEATURES SBC-STAT3 MENUS


5.7 SBC-STAT3 MENUSThe SBC-STAT3 displays a menu system through which the user navigates using the SBC-STAT3 buttons.

There are four (4) menus, each of which provide different levels of monitoring and control. They are asfollows:

User Install Balance Service

Sections 5.7.1 through 5.7.4 further describe the SBC-STAT3 menus.

5.7.1 USER MENUThe main menu is the User Menu. The User Menu can be reached by pressing the Select button ( ) whileviewing the room temperature display.

Figure 5-3: User Menu

From the User Menu, the user can press the up and down arrow buttons to highlight an entry. The entriesare Override, degrees Fahrenheit, and degrees Celsius. Highlight then press the Select button ( ) toinitiate an action or enable/disable a function. Press the Escape button ( ) to exit and return to theprevious menu.

NOTEIf the user selects Override while the + iconis displayed, extended occupancy will becanceled.

UserMenu

OverrideFahrenheitCelsius

SBC-STAT3 MENUS SECTION 5: SBC-STAT FEATURES


5.7.2 INSTALL MENUTo enter the Install Menu, press the Escape ( ) and Up ( ) buttons simultaneously. A password promptwill appear. Enter your four digit password using the up and down arrow buttons. The default passwordsare as follows:

User: No password required Install: 3300 Balance: 2200 Service: 1100

Press Select ( ) to move each place to the right. Once you have selected the correct password press 4one more time to enter the Install Menu.

Through the Install Menu, users can: View Ctrl Mon functions (further described in Section 5.7.2.1); Perform an LED Test (further described in Section 5.7.2.2); Reset the SBC-STAT3 and the NB-VAV (further described in Section 5.7.2.3)

The menu display remains on for four minutes. The LED flashes yellow 15 seconds before the displayclears. Pressing any button while viewing the menu extends the time the menu is displayed. To exit out ofa menu, press the button until the room temperature screen is displayed.

Figure 5-4: Install Menu

5.7.2.1 CONTROL MONITORThe first menu option listed in the Install Menu is Ctrl Monitor. This option allows the monitoring oftemperature and flow control operation.



Figure 5-5: Control Monitor Screen 1

Figure 5-6: Control Monitor Screen 2

5.7.2.2 LED TESTA temporary option under the Install menu is LED test. This allows the installer to toggle the LED modes.The modes are: Green Red Bright Red Flash Green Flash Slow Yellow Flash Yellow Flash Yellow.5.7.2.3 RESETThis option restarts the NB Controller and the SBC-STAT3.

5.7.3 BALANCE MENUThrough the Balance Menu, users can:

View Ctrl Monitor functions (refer to Section 5.7.2.1); Perform Calibrate functions (further described in Section 5.7.3.1); Perform Damper Mode functions (further described in Section 5.7.3.2);

Temp 72.0Setp 72.0Zone VentLoad 0

Flow 100Targ 100%Pos 10

Sply 75.0Sys Heating



Perform Flow Setpoint adjustments (further described in Section 5.7.3.3); and) Reset the SBC-STAT3 and the NB-VAV (refer to Section 5.7.2.3)

To access the Balance Menu, press the and the buttons simultaneously. Enter your four digitpassword using the up and down arrow buttons to scroll through the numbers and Select ( ) to moveeach place to the right. Once you have selected the correct password press one more time to enter theBalance Menu screen (as shown in Figure 5-9). The default password is 2200.

5.7.3.1 CALIBRATESections 5.7.3.1.1 through 5.7.3.1.5 describe the functions that can be performed from the Calibrationmenu.

5.7.3.1.1 1ST MEASURED CFMSingle-point calibration uses 1st Measured CFM only. Here the measured airflow in CFM is entered duringthe calibration process. Multi-point calibration uses two (2) CFM readings. The 1st Measured CFMcalculates the K Factor while the 2nd Measured CFM uses both readings to calculate the K Factor and theZero Offset.

5.7.3.1.2 2ND MEASURED CFMWhen you enter the Calibrate Menu for the first time, there will be an X next to 2nd Measured CFM. Thismarks the 2nd Measured CFM unavailable until a single-point calibration is performed. Once the single-point calibration is performed a appears next to the menu option. A will also appear next to 2ndMeasured CFM after the multi-point calibration is performed. See Setting Values earlier in this section forinformation on entering a value.

5.7.3.1.3 K FACTORFor the initial NB Controller setup, the K Factor can be estimated. Performing a field flow calibration isrequired for precise flow measurement. After the calibration procedure is complete you can view theprecise K Factor by Selecting this option. For information on entering a value, see Setting Values earlierin this section.



Figure 5-7: Balance Menu

Figure 5-8: Calibration Menu

5.7.3.1.4 Z OFFSETUsers can view or set the Zero Offset value determined by the single- or multi-point calibration process.

5.7.3.1.5 ZERO CFM CALSelecting this option opens a screen allowing you to press to initiate the Zero Offset calibration. Thisoption is only used in single-point calibration.

5.7.3.2 DAMPER MODEFrom this menu, users can change the Damper Mode (DM) property in the Flow Control object. TheDamper Modes are as follows: Controlled (Automatic) (DM=0) Full Open (DM=1) Min Cool (DM=2) Max Cool (DM=3) Min Heat (DM=4) Max Heat (DM=5) Min Warm-up (DM=6) Max Warm-up (DM=7)

BalanceMenu

Ctrl MonitorCalibrateDamper Mode4

4

CalMenu

1st Meas CFM2nd Meas CFMK Factor

1st Meas CFM2nd Meas CFMK FactorZ OffsetZero CFM Cal



Figure 5-9: Damper Mode Menu

5.7.3.3 FLOW SETPOINTS

Figure 5-10: Setpoints Menu

Through this menu, you can view and edit the following Flow Setpoint object properties:

Min Cool [Cooling Minimum Flow (CM)] Max Cool [Cooling Maximum Flow (CX)] Min Heat [Heating Minimum Flow (HM)] Max Heat [Heating Maximum Flow (HX)] Min Warm-up [Warm-up Minimum Flow (WM)] Max Warm-up [Warm-up Maximum Flow (WX)]

NOTEOnly one mode can be selected at a time.

DamperMode

ControlledFull OpenMin Cool

SPMenu

Min CoolMax CoolMin Heat



5.7.4 SERVICE MENUTo enter the Service Menu press the Escape ( ) and Down ( ) buttons simultaneously. Enter your fourdigit password using the up and down arrow buttons. Press the Select ( ) button to move each place tothe right. Once you have selected the correct password, press Select one more time to enter the ServiceMenu. The default password for this menu is 1100.

Through the Service Menu, users can:

View Ctrl Monitor functions (refer to Section 5.7.2.1); Adjust the temperature offset Select local or global temperature (further described in Section 5.7.4.1); Perform Temperature Setpoint adjustments (refer to Section 5.7.4.2); View Version information; (further described in 5.7.4.3); and Reset the SBC-STAT3 and the NB-VAV.5.7.4.1 LOCAL TEMPThis option toggles the multiple thermostat display between zone and individual modes.5.7.4.2 TEMP OFFSET, COOLING SP, HEATING SP, OR WARM-UP SPThese options open an Edit screen allowing you to change a value. Use the up arrow button to togglebetween a negative (-) and positive (+) sign. Use the button to move places to the right and the up anddown arrows to change a value. Once you have entered a desired value, press to highlight and press once more to store the value and return to the Service Menu. To exit the Edit screen without saving anychanges, press .

Figure 5-11 Cooling SP Screen

Adjust

+ 0072.0Cooling SP

esc next +/-



Figure 5-12 Service Menu

5.7.4.3 VERSIONThis option displays:

NB controller’s Serial Number, The Version Number of the software, The Release Code, The Firmware Type, The Controller Type, The NB controller’s Unit ID, The Thermostat Version, and The Global ID.

Figure 5-13 Version Screen

ServiceMenu

Ctrl MonitorTemp OffsetLocal Temp

Ctrl MonitorTemp OffsetLocal TempCooling SPHeating SPWarmup SPVersionReset

NB-VAV User Manual (5/2/2007) A-1

DEVICE

NOTEThe Device object is represented in NB-Proas follows: AAM VAV xxxxxxxxxx(where xxxxxxxxxx is the Unitary Controllerserial number)

Property Identifier #

Data Type Access Store &

Default Description

BU 16758 Bool RW RAM0 Backup Control

CC 16770 UInt RW EE0

Count of Clock Fails

CM 16779 UInt RORAMFlash255

Controller Manufacturer Code

CP 16781 UInt RW EE6

Network Baud Rate0=96006=38.4K7=19.2K8=115.2K9=57.6K.

CT 16784 UInt RORAMFlash202

Controller TypeNB-VAV is 202

DE 16795 UInt RW RAM0

Default Enable Commandset equal to 197 to set the controller to its default values

EM 16813 Bool RW EE0

English/Metric0=English1=Metric

FT 16834 UInt RORAMFlash1

Firmware Type

IC 16876 UInt RO EE0

EEPROM Default Count

ID 16877 UInt RWEEFactory Set

Unit IDDefaults to last 2 digits of Serial Number

MS 16902 Bool RW EE0

Master/Slave Mode0=Slave1=Master

OC 16917 UInt RW EE0

Count of Illegal Opcodes

OS 16925 Float RO RAMFlash Kernel Version

PD 16942 UInt RW EE5 Power-on Delay

PS 16951 UInt RW EE2

Power-up State0=unoccupied1=warm-up2=occupied3=night setback

RC 16963 UInt RW EE0 Power-up Count

RS 16972 Bool RW RAM0

ResetTo reset the NB-VAV, set this property = 1

SN 16991 UInt ROEEfactory set

Serial Number

SR 16994 UInt RO RAMFlash

Software Time Stamp

UP 17030 UInt RO EE0

Flash Update Count

VE 17043 Float RO RAMFlash

Software Version

WC 17050 UInt RW EE0

Count of Watchdog COP



Default Description

APPENDIX A: NB-VAV OBJECTS AND PROPERTIESThe following tables contain a list of proprietary object and property assignments for the NB-VAVra, NB-VAVrf, NB-VAVta, and NB-VAVtf.

Each property is given with its BACnet object assignment identifier number, BACnet data type, access code, whereit is stored, its default, and a brief description.

DEVICE APPENDIX A: NB-VAV OBJECTS AND PROPERTIES

A-2 NB-VAV User Manual (5/2/2007)

ZN 17084 UInt RW EE0 Zone Number

ZP 17085 UInt RO RAM0

Count of High Current Pulses



Default Description

APPENDIX A: NB-VAV OBJECTS AND PROPERTIES ZONE TEMPERATURE - AI00


ZONE TEMPERATURE - AI00



Default Description

AE 16743 UInt RW EE0

Alarm Enable0=Disabled4=Low limit alarm5=High limit alarm6=low and high limit alarm1-3, 7-12 are unused

AS 16747 UInt RO RAM0

Alarm Status0=No alarm5=Low limit alarm6=high limit alarm1-4, and 7-12 are unused

BM 16754 UInt RW EE0

SSB Bus Mode0=Master1=Slave

BT 16757 UInt RW

EE1cooling only

Application Box Type0=None1=Cooling Only2=Heating Only3=Supply Dependent

CC 16770 Float RO RAMNA

Current Cooling Setpoint

CH 16775 Float RO RAM Current Heating Setpoint

DF 16796 UInt RWEE0##

Thermostat Display Format0=##°1=##.#°2=##°F (or C)3=##.#°F (or C)4=No Temp Display

DL 16798 Float RO RAMNA

Total Zone Demand Load

DM 16799 UInt RO RAMNA

Demand Mode Cool/Heat/Vent0=Vent1=Cool2=Heat

DS 16803 UInt RW

EE0degrees F

Thermostat Display Mode0=°F1=°C

DV 16805 UInt RW EE0

Thermostat Display Value0=Each SBC-STAT displays the average value of all connected STATs1=Each STAT will display its own temperature value

ED 16808 UInt RWEE60 minutes

Extended Occupancy Time

ER 16816 UInt RO RAMNA

Extended Occupancy Remaining

ET 16818 Bool RW EE0

Enable Totalization

G0 16837 UInt RO RAMNA

Global ID for STAT Bus Device 0







OA 16916 UInt RW RAM0

Extended Occupancy Accumulation

OF 16919 Float RW EE0

Temperature Adjustment

PB 16940 UInt RW EE2200 Balance P.I.N.

PG 16945 UInt RW EENA Primary GID

PI 16947 UInt RW EE3300 Installer P.I.N.

PS 16951 UInt RW EE1100 Service P.I.N.

PU 16952 UInt RW EE0000 User P.I.N.



Default Description

ZONE TEMPERATURE - AI00 APPENDIX A: NB-VAV OBJECTS AND PROPERTIES


RM 16969 UInt RW EE0

Reading Modespecifies the technique used to determine Zone Temperature when multiple SBC-STATs are used. 0=Average mode 1=Highest2=Lowest3=Hi/Lo VST4=specific STAT selected by device position 05=specific STAT selected by device position 16=specific STAT selected by device position 27=specific STAT selected by device position 38=Primary GID

RT 16973 Bool RW RAM0

Reset Accumulations1=resets total accumulated flow and total accumulated energy properties to zero. This property returns to 0 upon completion of reset

SD 16983 UInt RW EE0

Calculated Setpoint Display0=Disabled1=Zone Midpoint2=Heating Setpoint3=Cooling Setpoint

SE 16984 UInt RWEE1 enables

Override Disabled/Enabled0=disables an end-user’s ability to enter extended occupancy via an SBC-STAT1=enables an end-user’s ability to enter extended occupancy via an SBC-STAT

SU 16997 Float RW EE0.0

Alarm Setup/Setback Value

T0 17002 Float RO RAMNA

Thermostat 0 Reading







Default Description



TE 17007 UInt RW RAMNA Total Energy

TF 17008 UInt RW RAMNA Total Flow

TM 17011 Float RW EE0.5°F Offset Increment

TP 17013 Int RW RAM0

User Adjust Position

TR 17014 UInt RW RAM0

User Adjust Remaining

TS 17015 Float RW RAM0 Setpoint Offset

TT 17016 UInt RWEE120 minutes

User Adjust Duration

ZS 17087 Float RW RAM70.0 Zone Midpoint



Default Description

APPENDIX A: NB-VAV OBJECTS AND PROPERTIES UNIVERSAL INPUTS 1-2 - UI01-UI02


UNIVERSAL INPUTS 1-2 - UI01-UI02



Default Description


Alarm Enable0=Disabled1=Contact, 0→12=Contact, 1→03= Change of State, ´4=Low Limit Alarm5=High Limit Alarm6=Low and High limit Alarm7-12 are unused

AS 16747 UInt RO RAM0

Alarm Status0=Normal1=Contact, 0→12=Contact, 1→03= Change of State, ´4=Low Limit Alarm5=High Limit Alarm6=Low and High limit Alarm7-12 are unused

DT 16804 UInt RW EE253

Data Type

IF 16878 UInt RW EE0.0 Input Filtering

IP 16881 Bool RW EE0

Polarity (Digital In)When IP=0, low voltage Present_ value=0, high voltage Present_ value=1, and closed contact =0. When IP=1, low voltage Present_ value=1, high voltage Present_ value=0, and closed contact =1

OF 16919 Float RW EE0.0

Temperature Adjustment

ST 16996 UInt RW EE7

Sensor Type0=digital2=full scale, linear input scaled from min_pres_value to max_pres_value3=4-20mA input scaled from min_pres_value to max_pres_value7=−22.0 to 122.0°F (−30.0 to 50.0°C) thermistor (default)1, and 4-6 are unused

SU 16997 Float RW EE0.0

Setup/Setback Limit



Default Description

FLOW CONTROL APPENDIX A: NB-VAV OBJECTS AND PROPERTIES


FLOW CONTROL



Default Description

AC 16741 UInt RW EE1

Auto/Manual/Track Mode Select0=Manual1=Auto2=Tracking


Enable Alarming0=Disabled4=Low Limit5=High Limit6=Low and Hi Limit1-3,7-12 are unused

AS 16747 UInt RO RAMNA

Alarm Status0=Normal (noalarm)5=Low Limit6=High Limit1-4, 7-12 areunused

AT 16748 UInt RW EE0

Actuator Type0=LM-24M(MMT)1=Generic D/C2=Generic A/C3=None

CA 16768 UInt RO RAMNA Average Flow

CB 16769 Bool RW RAM0 Calibrate Flow

CD 16771 UInt

RW with manual CAV

RAMNA Target Flow

CK 16777 UInt RW EE768

Duct Scaling Factor (K)

DC 16793 UInt RW EE1

Damper Control Mode0=Pressure Dependent1=measured Flow

DD 16794 Bool RW EE0

Damper Direction0=Normal1=Reverse

DM 16799 UInt RW EE0

Damper Mode0=Automatic1=Full Open2=Min Cool3=Max Cool4=Min Heat5=Max Heat6=Min Warmup7=Max Warmup

DP 16801 UInt RO RAMNA Damper Position

DS 16803 UInt RO

Damper Status0=Ready1=Disconnected/Open2=Jammed/Shorted

EF 16810 UInt RW EE700

Estimated Flow at Full Open

EP 16815 UInt RO RAMNA

Estimated Target Damper Position

FC 16824 Bool RW RAM0

Fan Status/Control

FH 16827 UInt RW EE20 Flow Hysteresis

K2 16883 UInt RW RAMNA

Measured CFM for Multi-point Calibration

KC 16884 UInt RW RAMNA

Measured CFM for K Factor Adjust

OF 16919 Int RW EE0 Flow Offset

RZ 16975 UInt RO RAMNA

Count of High Current Pulses

SU 16997 UInt RW EE0.0 Alarm Setback



Default Description

APPENDIX A: NB-VAV OBJECTS AND PROPERTIES SUPPLY TEMPERATURE


SUPPLY TEMPERATURE

ANALOG OUTPUT - AO01

FAN DIGITAL OUTPUT - BO01

DIGITAL OUTPUTS 2-5 - BO02-BO05



Default Description

DD 16794 Float RW EE2.5°F

Auto Duct Delta Temperature

IC 16876 UInt RW EE1

Input Select0=Disabled1=UI12=UI2

OF 16919 Float RW EE0

Supply/Duct Temperature Adjust

SM 16990 UInt RO RAMNA

Cooling/HeatingSupply Mode0=Cooling1=Heating



Default Description

DT 16804 UInt RW EE252

Data type

HS 16863 Float RW EE100.0

Maximum Scaled Voltage

LS 16894 Float RW EE0.00

Minimum Scaled Voltage



Default Description

FC 16824 Float RW EE2.0

Minimum Cycle Time

FO 16830 UInt RW EE0

Fan/Damper Application0=No Fan/Induction Damper1=Series Fan2=Parallel Fan3=Induction Damper

FS 16833 UInt RW EE0

Fan setpoint usedto se parallel fan,induction damperof constantvolume setpoint(CFM),

RH 16966 Float RW RAM Run Hours

RL 16968 Float RW EE0.0 Run Limit

SF 16985 Bool RW EE0

Fan Mode0=Series fan is always on during unoccupied periods1=Series fan control is based on Zone Temperature



Default Description

RH 16966 Float RW RAM0

Run Hours

RL 16968 Float RW EE0.0

Run Limit

SCHEDULE APPENDIX A: NB-VAV OBJECTS AND PROPERTIES


SCHEDULE FLOW SETPOINTS



Default Description

HE 16853 Bool RW EE0

Host Overrides0=Disabled1=Enabled

HO 16860 UInt RW RAM0

Host Schedule0=Unoccupied1=Warm-up2=Occupied3=Night setback

IS 16882 UInt RW EE3

InactiveSchedule State0=Unoccupied1=Warm-up2=Occupied3=Night setback

ZE 17081 Bool RW EE0

Receive Schedule0=No1=Yes



Default Description

CI 16776 Float RW EE5.0%

Cooling Integration Constant

CM 16779 UInt RW EE100

Cooling Minimum Flow

CP 16781 Float RW EE5.0°F

CoolingProportionalBand

CX 16786 UInt RW EE500

Cooling Maximum Flow

HI 16857 Float RW EE5.0%

Heating Integration Constant

HM 16859 UInt RW EE100

Heating Minimum Flow

HP 16861 Float RW EE5.0

Heating Proportional Band

HX 16866 UInt RW EE500

Heating Maximum Flow

WI 17052 Float RW EE10.0%

Warmup Integration Constant

WM 17053 UInt RW EE300

Warmup Minimum Flow

WP 17055 Float RW EE5.0°F

Warmup Proportional Band

WX 17057 UInt RW EE700

Warmup Maximum Flow

AS 16747 UInt RW EE700 PPM

Air Quality Setpoint

AM 16745 UInt RW EE400 CFM

Air QualityControl Max Air Flow

RP 16971 UInt RW EE10 %/min

Air Quality Damper Ramp Rate

DB 16792 Uint RW EE50 PPM

Air Quality Deadband

APPENDIX A: NB-VAV OBJECTS AND PROPERTIES ELECTRIC REHEAT


ELECTRIC REHEAT

VALVE CTRL 1-2



Default Description

AF 16744 UInt RW EE0

Require Max Airflow?0=No1=Additional reheat stages do not become energized until the PID loop calls for max airflow

AV 16750 BitStr RO RAMNA

Stages Availablefor Use

BA 16751 UInt RW EE0

Reheat Balance Mode

EN 16814 BitStr RO RAMNA

Stages Energized

FR 16832 BitStr RW EE15

Stages Requiring Flow

ID 16877 Float RW EE4.0

Interstage Delay Time

MX 16905 Float RW EE105.0

Maximum Supply Temperature

OF 16919 Float RW EE1.5°F Reheat Offset

RO 16970 UInt RW EE0

Reheat Application1=Disabled2=2-stage (K2-3)3=2-stage (K4-5)4=4-stage (K2-5)



Default Description

AM 16745 Bool RW EE0

Auto/Manual Mode0=Manual1=Automatic

CD 16771 Bool RW EE0

Change Valve Direction0=Normal1=Reverse

PP 16950 UInt RW EE0 PWM Period

RI 16967 UInt RW EE0

Recalibration Interval Check

ST 16996 UInt RO RAMNA

Valve Status0=Off1=Open2=Close3=Calibrate

TH 17009 Float RW EE105.0

DAT High Temperature Lockout

TL 17010 Float RW EE45.0

DAT Low Temperature Lockout

UT 17032 UInt RW EE5

Update Threshold

VA 17041 UInt RO RAMNA

Actual Valve Position

VD 17042 UInt RW RAMNA

Valve Desired PositionIf AM=0, then this property can be set manually by a host.

VI 17044 Float RW EE5.0

Valve Integration Constant

VM 17045 UInt RW EE0

Valve Mode0=PWM1=Floating Point

VO 17046 Float RW EE0.0

Valve Temperature Offset

VP 17047 Float RW EE5.0

Valve Proportional Band

VT 17048 UInt RW EE180

Recalibrated with New Value

VU 17049 UInt RW EE0

Valve Use0=disabled1=cooling2=heating



Default Description

ANALOG CONTROL APPENDIX A: NB-VAV OBJECTS AND PROPERTIES


ANALOG CONTROL

OCCUPANCY DETECTOR

PROOF OF FLOW



Default Description

AO 16746 UInt RW RAMNA Analog Output

CE 16772 Bool RW EE0

Control Enable0=Disabled1=Enabled

CS 16783 Float RO RAMNA Control Setpoint

DB 16792 Float RW EE0 Deadband


Input Select0=Disabled1=Zone Temp2=Supply Temp3=Flow4=UI15=UI29=Zone Heat10=Zone Cool

IN 16880 Float RO RAM0 Input Value

MR 16901 Float RW EE0 Maximum Reset

PB 16940 Float RW EE0

Proportional Band

PO 16949 Float RW RAMNA Percent Output

RC 16963 Float RO RAMNA Reset Value

RL 16968 Float RW EE0 Reset Limit

RP 16971 UInt RW EE0

Reset Period0=Disabled

RS 16972 Float RW EE0 Reset Setpoint

RT 16973 Float RW EE0 Rate

RV 16974 UInt RW EE0

Reset Variable0=disables reset, 1=zone temp2=supply temp3=flow4=UI15=UI2

SG 16986 UInt RW EE0

Action0=Normal1=Reverse

SP 16993 Float RW EE0 Loop Setpoint

SU 16997 Float RW EE0 Setup/Setback



Default Description



MD 16896 UInt RWEE30Seconds

Extended Occupancy Delay

MR 16901 UInt RO RAMNA

Extended Occupancy Remaining

MS 16902 UInt RO RAMNA

Occupancy Status

MT 16903 UInt RWEE010Minutes

Extended Occupancy Duration



Default Description

DR 16802 UInt RW EE0

Method to Determine Flow0=None1=Minimum Flow2=Digital Input3=Both



MF 16897 UInt RW EE75

Minimum Required Flow

PD 16942 UInt RW EE60

Proof of Flow Delay

PF 16944 UInt RO RAM1

Proof of Flow Indication



Default Description

APPENDIX A: NB-VAV OBJECTS AND PROPERTIES BROADCAST SCHEDULES


BROADCAST SCHEDULES



Default Description

CV 16785 UInt RO RAM0 Current Value

RB 16962 Bool RW EE0

Receive Broadcasts?0=No1=Yes

BROADCAST SCHEDULES APPENDIX A: NB-VAV OBJECTS AND PROPERTIES


nb-vav user manual

Documents

10mm hex nuts

pulse width

prevents false

indoor air

low voltage

run hour totals

protocol conformance

chilled water