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CODETHIS DOCUMENT IS THE PROPERTY OFCARRIER CORPORATION AND IS DELIVEREDUPON THE EXPRESS CONDITION THATTHE CONTENTS WILL NOT BE DISCLOSEDO R U S E D W I T H O U T C A R R I E RCORPORATION’S WRITTEN CONSENT

SUBMISSION OF THESEDRAWINGS OR DOCUMENTSDOES NOT CONSTITUTEPA RT P E R F O R M A N C EO R A C C E P TA N C E O FCONTRACT

06/15/2010

4 5 J / K / Q - D - 4 4 8 4

PRODUCT INFORMATION IS SUBJECT TO CHANGE WITHOUT NOTICE.

CONSTANT VOLUME FAN 45JD,KD,QD

1 OF 4

Application:Fan powered constant volume terminals are designed toprovide heating and cooling for perimeter zones.Theseterminals are also used in interior zones, where a constantvolume of air (consisting of a combination of primary airmixed with recirculated air) provides the required air move-ment. A typical application is shown in Fig. 1. Design, loadrequirements, downstream (external) static pressure, fanperformance and sound level acceptability govern terminalselection and sizing.The terminal fan performance isselected to provide sufficient pressure to overcome the coilpressure drop and external static pressure, permitting theuse of smaller, more energy efficient primary air fan systems.(It is important that the correct fan and fan speed be selectedto ensure that sufficient Btu’s can be delivered to meet theheating and cooling load requirements.)The controls providevariable air volume (VAV) control of the primary air for coolingand operate a modulating hot water valve connected to aheating coil to supplement fan induced plenum heat duringheating. As the primary airflow is reduced, the fan induces airfrom the plenum to provide a constant volume of air to thezone. A wall-mounted space temperature (SPT) sensorlocated in each zone will sense load requirements and acti-vate the control sequence to accommodate cooling or heat-ing.The control provides a fan start-up sequence to ensureproper rotation of the terminal’s fan. Whenever the primaryair source begins operation, the control will initiate the fanstart-up sequence. Each control will provide a delay that isdependent on the control’s address, before initiating the

sequence.The delay prevents multiple terminals fromperforming the sequence simultaneously.The sequence willclose the primary air damper fully to stop the primary airflowand allow the fan wheel to stop rotating, then will energizethe terminal fan.The damper will then modulate to providethe primary airflow as required by the specific sequence ofoperation.This control package provides the followingsequences of operations:

A. Cooling: (refer to numbers on flow diagram). See Fig. 2.

1. 1-2 indicates that maximum primary airflow is estab-lished by the user-defined maximum cooling airflow setpoint until the zone comes under control at 2.

2. Beginning at 2, the primary airflow is regulated over athrottling range by the damper until the minimum cool-ing airflow set point is reached at 3.The minimumcooling airflow set point can be set to zero by the user.In this case, the damper will fully close if the zonetemperature continues to fall. As the primary airflow isreduced, the fan induces ceiling plenum air to maintaina constant air volume to the zone.

3. 3-4 indicates that, should the zone temperaturecontinue to fall, the damper will hold the user-definedminimum cooling airflow set point.

B. Auxiliary hot water heating: (when the primary air sourceis cooling, refer to numbers on flow diagram). See Fig. 2.The installer is responsible for proper selection of the fanspeed to provide sufficient airflow through the heating coil.

BACnet CONSTANT VOLUME FAN—WITH PROPORTIONAL (FLOATING) HOT WATER HEAT CARRIER CONTROL PACKAGE NO. 4484

PLENUMAIR

PRIMARYAIR

AIRFLOWSENSOR DAMPER

ACTUATOR

PRIMARYAIRDAMPER

FAN

HEAT COIL

LEAVINGAIR

LEAVING AIRTEMPERATURESENSOR

SPACETEMPERATURE

SENSORBACnetMS/TP

ZONECONTROLLER24 VAC

HEATVALVE

Figure 1 - Series Fan Powered Air Terminal With Proportional Hot Water Heat

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4 5 J / K / Q - B - 4 4 8 42 OF 4

1. Should the zone temperature fall below the occupiedheating set point, the Occupied Heating mode is ineffect at 4.

2. At 5, the hot water valve will modulate open as requiredto provide heating and satisfy the load requirements.The valve is controlled so as not to exceed the maxi-mum discharge temperature limit. The primary airflowis maintain at the user-defined minimum cooling airflowset point.

3. When the zone temperature rises above the occupiedheating set point, the valve modulates closed and theVentilation mode is reactivated at 4.

C. Heating: (when the primary air source is providing heatedair, refer to numbers on flow diagram). See Fig. 2.1. Upon receiving a heating signal generated by the air

source equipped with BACnet controls (or a primary airtemperature sensor is installed to detect that the airsource is heating), should the zone temperature fallbelow the occupied heating set point, the Heatingmode is in effect at 4'.

2. The primary air damper is throttled between the user-defined minimum heating airflow set point at 4' and theuser-defined maximum heating airflow set point at 6.The hot water valve modulates as required to supple-ment the temperature of the mixture of induced plenumair and heated primary air. The valve is controlled so asnot to exceed the maximum discharge temperature.

3. The control may be configured to provide minimumprimary airflow during heating. In that case the primaryair damper will maintain the minimum heating airflowset point at 4' to provide ventilation air to the zone. Thehot water valve will modulate as required to conditionthe discharge air to meet the zone’s heating require-ments. The valve is controlled so as not to exceed themaximum discharge temperature.

D. Unoccupied time period: (cooling)When the unoccupied period is reached, the user-definedoccupied cooling set point is reset upward to a user-defined unoccupied cooling set point. If the primary airsource is operating, the primary air damper will throttlein the same manner (as per A) during the unoccupiedperiod, using the unoccupied cooling set point. If the pri-mary air source was not previously operating, the controlwill initiate the fan start-up sequence and enable the fanbefore modulating the primary air damper. If the primaryair source is not operating, then the fan will remain off.

E. Unoccupied time period: (auxiliary hot water heating)When the unoccupied period is reached, the user-definedoccupied heating set point is reset downward to a user-defined unoccupied heating set point. If the primary airsource is not operating and the zone’s temperature isbelow the unoccupied heating set point, the UnoccupiedHeating mode is in effect.The primary air damper will fullyclose and the terminal fan will start. The hot water valvewill modulate as required to supplement the plenumair heat. When the zone’s temperature rises above theunoccupied heating set point, the valve will modulateclosed and the fan will stop after the user-specified fandelay has expired. The primary air damper will then bereturned to a 50% open position to allow the primary airsource to properly start.

F. Unoccupied time period: (heating)When the unoccupied period is reached, the user-definedoccupied heating set point is reset downward to a user-defined unoccupied heating set point. If the primary airsource is operating, the primary air damper will operate inthe same manner (as per C) during the unoccupied period,using the unoccupied heating set point. The hot watervalve will modulate as required to supplement the temper-ature of the mixture of induced plenum air and primary air.If the primary air source was not previously operating, the

100%MAX COOL LIMIT

(DAMPER OVERRIDEPRESSURIZATION

MODE)MAX HEAT LIMIT

MIN HEAT LIMIT

MIN COOL LIMIT

0%

FULL HEATING

FULL COOLING

DEADBAND

COOL WARMOCCUPIEDCOOLING

NTFCSETPOINT

OCCUPIEDHEATING &MORNINGWARM-UPSETPOINT

DAMPEROVERRIDE-

EVACUATIONMODE

< >

AIRFLOW

SPACE TEMPERATURE

PROPORTIONALHOT WATER VALVE

OPEN CLOSED

12

34

4'

6

5

Figure 2 - Sequence of Operation for Series Fan Powered Air Terminal With Proportional Hot Water Heat

LEGENDNTFC—Nighttime Free Cooling

Air Source Supplying Heated AirAir Source Supplying Cooled Air

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4 5 J / K / Q - D - 4 4 8 43 OF 4

control will initiate the fan start-up sequence and enablethe fan before modulating the primary air damper. If theprimary air source is not operating and the zone tempera-ture is above the unoccupied heating set point, then thefan will remain off.

G. Morning warm-up: Units configured to provide variablevolume heatingUpon receiving a morning warm-up signal generated bythe air source equipped with BACnet controls, the control willinitiate the fan start-up sequence and enable the fan. Afterthe fan is operating, the damper will go to the maximumheating airflow set point if the zone temperature is belowthe occupied heating set point at 6. The hot water valvewill modulate as required to supplement the temperatureof the air and controlled so as not exceed the maximumdischarge temperature. As the zone temperature risesabove the occupied heating set point, the hot water valvewill modulate close and the primary airflow will be reducedto the minimum heating airflow set point at 4'.

H. Demand controlled ventilation (option):This mode is initiated when the zone is occupied and theair source is not heating. It occurs when the BACnet controlreceives a cooling signal from the air source equippedwith BACnet controls, or when a primary air temperaturesensor is installed to detect the air source operation iscooling. The control will monitor a CO2 sensor (optional)and determine if ventilation is adequate. The zone CO2level is compared to the ventilation set point. If the CO2level is above the set point (insufficient ventilation), theairflow set point is increased appropriately to maintainproper ventilation. Should the zone’s temperature fallbelow the heating set point, the control will suspendventilation override until the zone’s temperature recovers.If after supplying plenum heat for the user-specified heatdelay, the heat was insufficient to raise the zone’s tem-perature, then heating will be enabled and will operateas per B.

I. Humidity control (option):This mode is initiated when the zone is occupied andthe primary air source is cooling. It occurs when theBACnet control receives a cooling signal from the airsource equipped with BACnet controls, or when a primaryair temperature sensor is installed to detect the air sourceoperation is cooling. The control will monitor a relativehumidity (RH) sensor (optional) and determine if the zone’sRH is above the humidity set point. If the RH level is abovethe RH set point, the airflow control point is increased

to displace the humid air in the space with air from theprimary air source (which has a lower dew point). Toensure non-simultaneous operation of both heating andcooling, should the increased airflow cause the zone’stemperature to fall below the heating set point, the controlwill first suspend the airflow override and reduce the air-flow to the minimum cooling set point. This will cause thefan to induce plenum air heat to warm the zone. If aftersupplying plenum heat for the user-specified heat delaythe heat was insufficient to raise the zone’s temperature,then heating will be enabled and will operate as per B. Theairflow override will resume when the zone’s temperaturerecovers and be disabled once the zone’s RH level fallsbelow the zone’s RH set point.

J. Damper override:The damper override function is energized through theuse of a field-supplied smoke control panel connected tothe air source equipped with BACnet controls. The smokecontrol panel and installation must be in accordance withUL864 and local codes. The damper override functionoverrides the airflow setting used by the logic. It will causethe terminal to operate the fan and provide the configuredmaximum cooling airflow when the air source is in thePressurization mode, and to disable the fan and fullyclose the primary air damper when the air source is inthe Evacuation mode.

K. Nighttime free cooling:The logic calculates a nighttime free cooling (NTFC)temperature set point halfway between the occupiedheating and occupied cooling temperature set points.Upon receiving a NTFC signal generated by the air sourceequipped with BACnet controls (or a primary air temperaturesensor is installed to detect the air source is operating inthe NTFC mode), the control will initiate the fan start-upsequence. Once the fan is operating, the primary airdamper will modulate and throttle between the maximumand minimum cooling airflow set points to maintain thezone’s NTFC temperature set point.

L. Primary air source shuts off:1. The fan will be disabled unless the zone temperature

falls below the heating set point (refer to E).2. The damper will fully close and the control will

recalibrate the airflow transducer.3. If the primary air source remains off (no primary air),

the damper will be repositioned to 50% open to allowthe air source to restart.

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CODETHIS DOCUMENT IS THE PROPERTY OFCARRIER CORPORATION AND IS DELIVEREDUPON THE EXPRESS CONDITION THATTHE CONTENTS WILL NOT BE DISCLOSEDO R U S E D W I T H O U T C A R R I E RCORPORATION’S WRITTEN CONSENT

SUBMISSION OF THESEDRAWINGS OR DOCUMENTSDOES NOT CONSTITUTEPA RT P E R F O R M A N C EO R A C C E P TA N C E O FCONTRACT

4 5 J / K / Q - D - 4 4 8 4

PRODUCT INFORMATION IS SUBJECT TO CHANGE WITHOUT NOTICE.

CONSTANT VOLUME FAN

4 OF 4

45JD,KD,QD

Notes:

1. For 45J/K/Q units the Actuator is configured CW to close.

2. CAUTION:Electric shock may result. Disconnect unit prior to servicing unit.

3. These controls have been wired to comply with UL-1995.