uniflair manual

Operation andMaintenance

UniflairChilled Water andDirect Expansion

Uniflair

Cooling System

Uniflair

Cooling System

This manual is available in English on the enclosed CD.

Este manual está disponible en español en el CD-ROM adjunto.

O manual em Português está disponível no CD-ROM em anexo.

Contents

General Information........................................................ 1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Microprocessor Control ................................................. 2General Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Imperial measurements selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Program Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

User Interface Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Pre-operation symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Operation symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Symbol examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Unit Start Up Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Switching Unit On and Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Switching on the unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Automatic mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Switching off the unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Adjusting Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Unit Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Unit on/off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Alarms history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Software information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13EXV valve status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13GSM modem status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Uniflair CW and DX Operation and Maintenance Manual i

Settings Menu Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Operative settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Hour meter settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Alarm relay selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Serial/modem settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18GSM modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19SMS message receipt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Message receipt result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22LAN settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Stand-by rotation alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Clock and Calendar Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Time bands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Configuring weekdays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Weekly program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Service Menu Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Hardware settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Software settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Sensors settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Alarm reset mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Memory operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36EXV valve settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Main settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Advanced settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Manual control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Updating the Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Winload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41SmartKey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Active alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Alarm history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Alarm events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Exceeding temperature or humidity limits . . . . . . . . . . . . . . . . . . . 43Optional sensor or digital input alarms . . . . . . . . . . . . . . . . . . . . . . 43Unit function alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Electronic expansion valve alarms (DX, TC, ES units only) . . . . . 45Sensor alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Service note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47LAN interrupted alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48System alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Access alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Remote alarm signalling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Uniflair CW and DX Operation and Maintenance Manualii

Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

Ambient Temperature Regulation Diagrams . . . . . . . . . . . . . . . . . .53CW Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53DX Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53TC Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54ES Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Ambient Humidity Regulation Diagram. . . . . . . . . . . . . . . . . . . . . . .55

Local Network ................................................................56Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Common Network Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . .57Up to 10 units connected to the network with a single terminal . . 57Up to 10 units each with its own terminal . . . . . . . . . . . . . . . . . . . . 57Up to 10 units with a single shared remote terminal . . . . . . . . . . . 57

pCO Boards Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

Remote Terminal Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

Important warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59Maximum distances between the terminal and the board . . . . . . . 60

LAN and Supervision Connection . . . . . . . . . . . . . . . . . . . . . . . . . . .60Technical features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Remote Terminal from the Board Connection . . . . . . . . . . . . . . . . .61

Terminal and pCO Board Addressing the Local Network . . . . . . . .62Assigning the list of private and shared terminals (pCO) . . . . . . . 62Assigning the list of private and shared terminals . . . . . . . . . . . . . 63

pCO board LAN address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64Unit address table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64Terminal and pCO board addresses table . . . . . . . . . . . . . . . . . . . . 65

LAN Parameter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

Displaying the Network from the Terminal . . . . . . . . . . . . . . . . . . . .68

Maintenance...................................................................69Safety During Maintenance Work . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Quarterly Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Uniflair CW and DX Operation and Maintenance Manual iii

Semi-Annual Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Annual Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71Replacing the filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Actuator and Chilled Water Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Actuator and Hot Water Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Electrical Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74Replacing the electrical heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

CW Troubleshooting ..................................................... 75Initial Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Electric Heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Humidity Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

DX Troubleshooting ...................................................... 78Initial Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Humidity Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Uniflair CW and DX Operation and Maintenance Manualiv

General Information

OverviewThis manual supplies general operation and maintenance information for Uniflair’s Microprocessor Control and Local Network.

The descriptions and illustrations in this manual are owned by Schneider Electric. Schneider Electric reserves the right to make any alterations it sees fit in order to improve the product without having to update this document.

The illustrations and images in this manual are examples only and may differ from practical situations.

SymbolsNote the icons and be observant for them throughout this manual (they are intended to call attention to potential hazards and important information).

Warning: Indicates a hazard which, if not avoided, could result in personal injury or death.

Note: Indicates important information.

AbbreviationsNote the model abbreviations and be observant for them throughout this manual:

• CW: Chilled Water• DX: Direct Expansion• ES: Energy Saving• TC: Twin-Cool

1Uniflair CW and DX Operation and Maintenance Manual

Microprocessor Control

General FeaturesThe microprocessor control manages unit operation. The control consists of:

• Microprocessor control board housed inside the electrical panel• Graphic user interface

The microprocessor control board contains the program settings and all the stored operating parameters that can be viewed and set on the user interface.

The control system has the following functions:

• Temperature and humidity control based on setpoints programmed on the user interface• Ability to set dual setpoints for temperature control• Complete alarm signalling system• Ability to record alarms• Configuration of alarm signal contacts on the user interface• Programming of automatic restart after power is restored• Remote unit switch on/off • Control compressor sequencing to guarantee efficiency and reliability• Setting of electronic thermostat valve with alarm signalling• Two levels for password (settings and service)• Ability to communicate with a supervision system using the RS485 serial board, LON FTT10 by

Trend and pCO Web (optional)• Control of clock/date (clock card optional)• Calculation of operating hours and cycle times of major components• Symbols to show the status of all sensors and the values recorded by the sensors connected to the

control board• Operating scheduling times for switching the units on/off (with optional clock board):

weekdays, weekends and holidays• Local Network Management with optional programming the rotation of one or two stand-by units

and the operation of these units setback mode settings based on average temperatures• “Override” function that allows manual control of major components without excluding remote

control

Control Board Graphic User Interface

Uniflair CW and DX Operation and Maintenance Manual2

User InterfaceThe user interface consists of:

• 1 backlit 132 x 64 pixel LCD display with buzzer• 6 backlit buttons to move between and change parameters

The microprocessor board is connected to the user interface by a 6-conductor telephone cable with a RJ11 jack connector.

Button Description

ALARM Views and resets alarms (flashes red when an alarm is triggered)

PROGRAM Enters Configuration Menu

ESCAPE Exits the screens

UP Moves up the menu

ENTER Confirms

DOWN Move down the menu


Language SelectionThe display uses the language that has been defined by the regulation program selected in the flash memory. The available language are:

• IT = Italian• EN = English• DE = German• FR = French• SP = Spanish• RU = Russian

To select a different language at any time, press the ESCAPE button and then the ENTER button.

Note: Screens that are reserved for use by service technicians (such as the “Service Menu”) will always appear in English.

From the CDZNEW 2.9 software version, it is possible to directly select the wanted language, using the appropriate screen.

The initials of the current language will appear in the bottom right corner of the screen.

To display this screen, press the PROGRAM button and select the “Language Menu.”

Imperial measurements selection

To display the imperial measurements select the language from the two available ones (English and Spanish). As seen in the screen above, the Fahrenheit symbol (°F) is displayed for English and Spanish. By enabling this mode, the values will be converted from:

• Celsius to Fahrenheit• Bar to PSI• Pa to in wc



Program IdentificationThis manual describes the standard operating characteristics for air conditioning units.

Note: The characteristics of special-order units may differ from those described in this manual.

Family Release Language Update LAN Version

CDZNEW v 3.0 GB 03/01/2011 LAN

User Interface DisplayThe user interface main screen displays the system state information.

• A: Time, date (if the clock card is inserted) and number of the unit in the LAN network• B: Room temperature and the percentage of humidity (if the temperature and humidity sensor is

installed)• C: Information regarding unit status

Pre-operation symbols

When the unit is not in operation, the following symbols display:

• : Press enter to switch on• : Switched off by remote contact• : Switched off by supervision system• : Switched off with timer• : Unit in operational transfer cycle• : Switched off by fire/smoke contact• : Switched off by flooding contact• : Setback mode• : Switched off by air flow alarm• : Switched off by manual shut down• : Switched off by high air flow alarm

ABC


Operation symbols

During operation, various symbols are displayed that indicate operating status of the unit:

Note: If the user interface is flashing, a call is in progress.

Symbol Description

Evaporator fan on

Power frequency

Alarm signalling (there is also a red flashing ALARM button)

Mechanical cooling activated

Compressor status (if more than 1, the number is shown inside)

Heaters on (if in stages, a number will appear by its side)

Cold water valve on

Hot water valve on

Hot gas valve on

Dehumidification on

Humidifier on

Generic alarm activated

Time rotation activated

Unit manual switch-on

Unit manually on

Unit manual switch-off

Unit switched on or off by remote terminal

Unit switched on by supervisory system


Symbol examples

In DX models, after the main screen, a second screen is displayed that indicates the number and status of the compressors.

In CW models, the displayed screen indicates the number of cold water valves, their opening, and the water inlet and outlet temperature.

In the CW model, if the hot water valve is also present, the corresponding icon is displayed with an opening percentage.

CW Model CW Dual Coil Version


Unit Start Up ConditionsThe following operations must be performed before unit start up:

• Check that the display light is on to verify that the controller is powered.• Check that the red light on the ALARM button is off (no alarms are active).• Check that the unit switches are ON after pressing the ENTER button, or, alternately:

– Check that the unit is started when the remote digital input ID2/4/6 contact is closed.– Check that the unit is started by the supervisory system (if a serial card is inserted).– Check that the unit is started by the daily or weekly time schedules (if clock card inserted).


Switching Unit On and OffSwitching on the unit

The unit can be switched on in any of the following ways:

• Manually: Using the keypad, press the ENTER button to switch on the unit; a moving bar will appear followed by fan symbol .

• Automatic mode: The unit can be switched on by:a. Remote on\off contact b. Supervision system (if serial card inserted)c. Timer system (if clock card inserted)d. Operational transfer cycle

Note: If the unit is programmed to setback mode, it will automatically switch on even when it exceeds the set humidity temperature limits .

Automatic mode

When in automatic mode, the unit can only be switched on by overriding it.

To switch the unit on in automatic mode:

1. Go to the main screen and use the UP or DOWN button to select “Switch On Unit.” The symbol will appear.

2. Press the ENTER button.3. Enter the password.

4. Press the ENTER button (the Override Switch On symbol will appear).

Note: The password is provided inside the envelope enclosed with this manual.

Switching off the unit

To switch off the unit:

1. Go to the main screen, press the UP or DOWN button to select “Switch Off Unit.” The symbol will appear.

2. Press the ENTER button.3. Enter the password.

4. Press the ENTER button (the Override Switch Off symbol will appear on the main screen).


Adjusting ParametersTo modify set parameters and to configure a sub-routine (setpoint, differential):

1. Proceed to screens in the programming method.2. Use the UP or DOWN button to select the screen that shows the parameter (a cursor flashes in the

top left corner).3. Press the ENTER button to move the cursor to the parameter to be modified.4. To select the parameter value, which can be numerical or Boolean (YES/NO), use the UP or

DOWN button.

Note: Numeric values can be varied only within the set control limits.

5. Press the ENTER button.6. To return to the previous screen, press the ESCAPE button.7. To modify parameters in other screens press ESCAPE until the cursor is at the start of the first

line.8. Press the UP or DOWN button to select the desired screen.


Unit ConfigurationThis screen allows you to view operation information; however, only the information or data relative to the chosen configuration appears.

To display unit configuration:

1. From the main screen, press the UP or DOWN button until reaching the menu that groups the items described in the following sections.

2. Select the desired option.3. Press the ENTER button.

Unit on/off

This screen is used to switch the unit ON and OFF.

Based on the current status of the unit, a different icon is displayed indicating the operation to be performed.

In the event of forced activation/deactivation in automatic mode (remote contact, supervisor, time bands), the settings password is required for confirmation.

Input/Output

This screen is used to verify the state of the input and output boards.

The initials on the display are the same used to identify components within the unit.

Setpoints

This screen is used to check the setpoint and the other calibration parameters for the correct operation of the unit. Since the parameters are read-only the values cannot be changed.

To set the values and access the parameters in programming mode, enter the settings’ password.

All variables are factory preset so that the control functions correctly maintain the room temperature.


Alarms history

This screen displays the historical sequence of the alarms activated (the microprocessor stores the last 100 events in its memory.)

All the alarms saved can be read in sequence by pressing the UP or DOWN button. If the clock card (optional) is installed, the date and time is recorded for each alarm event.

Software information

This screen displays the software version, BIOS, boot, and unit serial number.

This information is essential when adding a new unit to a group of connected units in the LAN (the controllers must have the same program version).

When contacting a service center, the version of the control program saved on the control board must be indicated precisely.

EXV valve status

This screen displays the information from the electronic expansion valve driver boards.

GSM modem status

This screen displays the information on the operating status of the GSM modem and any error signals.


Settings Menu DescriptionThis screen is used to set the unit operating and signal parameters.

To access the Settings Menu Description screen:

1. Press the PROGRAM button.2. Select the “Settings Menu” and press the ENTER button.3. Enter the settings’ password by pressing UP or DOWN button.4. Press the ENTER button.

Setpoints

This screen is used to check the setpoint and the other calibration parameters for the correct operation of the unit.

To set the values and access the parameters in programming mode, enter the settings password.

All variables are factory preset so that the control functions correctly maintain the room temperature.

Operative settings

All variables are pre-set in the factory so that the control functions correctly maintain standard conditions in the room.

This screen displays:

• Cooling setpoint• Cooling proportional band• Kp proportional cooling gain• Adjustment offset derived from remote setpoint (remote setpoint 0-10V present)• Setpoint active after the sum of the cooling setpoint plus offset• Status of the operating season (CW mode only)

This screen is displayed if electric heaters are installed:

• Heating setpoint• Kp proportional heating gain


This screen is displayed if the unit is connected to a system called Master Control, which is used to manage the cooling installation by optimizing the operation of all the devices.

This screen displays the humidity control setpoint.

This screen displays the second temperature control setpoint.

This screen displays whether the compensation setpoint is enabled and when the outlet probe is used for room temperature control.

Graph of the compensation function

This screen displays the alarm activation settings:

• High room temperature• Low room temperature• High room humidity• Low room humidity• High delivery temperature plus alarm enabling


Sleep mode

This screen displays the setback function, which can be either activated or deactivated by using the control panel or BMS. This function consists of an automatic start-up of the standby unit if the unit exceeds the following programmable limits for at least 30 seconds:

• Minimum temperature• Maximum temperature• Minimum relative humidity (only with optional humidity sensor)• Maximum relative humidity (only with optional humidity sensor)

The setback function intervenes to control the room conditions—although with larger tolerances— even if the whole system is in stand-by. Its intervention is independent and not influenced by signals from remote systems. The intervention of the setback function is not considered an alarm situation.

Fan Cyclical Start: If set to Y, the fan runs in cycles, defined by the cycle time, to allow air from the room to be drawn across the sensor.

When in setback mode, in the STATUS screen the symbol is displayed. Normal operating conditions are reset automatically when the temperature values return to values set for [temp. min. + 2°C] + 3.6°F and for [max. temp. - 2°C] - 3.6°F. A minimum of 15 minutes must pass before the unit exits the setback mode. This enables stable conditions to be reached and avoids continuous switching on and off of the fans.

When normal conditions return, the icon is displayed, alternating with other icons depending on the previous status.


Hour meter settings

This screen enables setting the maintenance intervals for the components of the unit, establishing a threshold for operation hours. When the device reaches that limit, the microprocessor signals the maintenance request, activating an alarm and displaying the symbol “ ” on the STATUS screen.

The following unit components have maintenance interval monitoring:

• Evaporator fans• Compressors• Electrical Heaters• Air filters• Humidifier

In the TC model, the hours of operating in DX and CW mode is displayed (hour meter parameters per each component):

• Reading the cumulative number of service hours• Setting the “Service” intervention threshold for maintenance (setting the threshold at “0” inhibits

the signaling of the “Service” request)• Zeroing the timer (Reset = “Yes”), e.g. after the service intervention and/or the replacement of the

componentValues can be changed only in the context of permitted setting fields.


Alarm relay selection

This screen is used to change the status of the alarm signal contact:, Alarm “A” and “B.”

This screen determines the digital output that signals the alarm. The configuration of an alarm does NOT affect the action performed by the controller (signal only on the display or shutdown of the device affected by the alarm).

Serial/modem settings

Supervision system: A supervision system exchanges data via a serial cable with the board of the unit that is commanded and controlled remotely. An optional serial card is available that permits the interface to an RS232/RS485 device for data transmission).

Both for an external supervision system (with the possibility to turn On/Off the unit) or with a closed-circuit monitoring system (only data transmission), the units serial address and the transmission speed must be set.

This screen allows you to determine:

• Serial address of the unit connected to the supervision serial network (must be the same as the serial address set in the supervision program)

• Speed of data transmission (‘Vel. Ser.’): 1200, 2400, 4800 for RS232 or 1200, 2400, 4800, 9600 and 19200 for RS485

• Communication Protocol Standard Modbus or GSM modemNote: With the LON protocol, set the serial speed to “4800” and the protocol to “Standard.”


GSM modem

This screen enables setting the parameters for the GSM modem connected to the unit through RS232 serial board inserted in UpCO1 board.

The parameters are:

• Total phone number: enter the number of telephone numbers present in contacts (maximum four)

• Phone number: enter the contact phone number and the phone number to be recorded (in case of alarm, the modem starts sending the text message (SMS) to the first number in contacts; in case of failed connection, the modem attempts the message again after 60 seconds, and then will move to the next number in the contacts)

• Modem password: password from remote• Modem rings: the number of rings to make• Send SMS enable: enables the sending of a text message (SMS) in case of an alarm activation

This screen enables entering a text message to be combined with the activated alarm message and then to be sent to the addressee of the numbers recorded in the previous screen.



The alarms activating the sending of the SMS are:

• “Loss of Air Flow”• “Compressor Alarm”• “Smoke-Fire Alarm”• “EXV Valve Failure”• “Heaters Overheating• “Clogged Filter”, • “Flooding Alarm”• “Room Humid.Limits”• “Room Temp.Limits”• “Control Failure”• “LAN Disconnected”• “Humid.Sensor Failure”• “Temp.Sensor Failure”• “High Air Flow”• “CW Alarm”• “Humidifier Alarm”• “Dig.Input 6 Alarm”• “Dig.Input 4 Alarm”• “Dig.Input 2 Alarm” • “Wrong Password” • “Low Air Pressure”,• “Frequency N.D.”

Example: The application managing the GSM modem may define an alarm message as:

<< Centrale Server Padova >> <<Loss of Air Flow >>

The first part of the message shows the unit allocation position (see the SMS text); the second part shows the type of alarm activated (see the alarms list).

This screen enables performing a operating test of the modem by means of sending a text message (SMS) written in the previous screen (SMS text).

Hang Up enables ending the call.

SMS message receipt

The application enables receiving SMS messages to perform operating or alarm reset controls. The messages must be sent to mobile telephones and not through the Internet.

The sent messages must have the following format:

.pCO1.0000.D.005.000001&

• .pCO1: message heading• .0000: remote password that must coincide with the value entered in the “Modem Password”

parameter• .D: type of variable to be set between “A” Analog, “I” Full and “D” Digital• .005: index of the variable to be set• .000001: the value with which the variable is to be set must always be of 6 digits, the first of

which represents the symbol, and the others are digits ‘0’ to ‘9’ For example, if the full variable has value 12, the value will be ‘000012’ or ‘+00012’. If the variable value is -243, the value will be ‘-00243’.

For the analog variables, the sent value is the effective variable value multiplied by 10. For example, the value ‘-00243’ will correspond to –24.3. For the digital variables, the possible values are ‘000000’ or ‘000001’.

One SMS message can manage a maximum of 11variables simultaneously (160 characters per message is the maximum).

The string will be made up as follows:

Warning: The SMS message must not contain spaces, and it must start with a dot.The fields must be separated by a dot, and the message must end with the character “&” (not preceded by a dot).

.pCO1 .0000 .D.005.000001 .A.001.+00023 .I.007.000001&1st variable 2nd variable 3rd variable


Message receipt result

The control board at regular two minute intervals downloads all newly received SMS messages. If the message is correct, the control activates its processing every 15 seconds without incoming or outgoing calls.

If the message is not correct in the syntax or in the password, it is deleted.

During the time necessary for processing the correct messages (about 7 seconds), the incoming calls are inhibited and re-enabled at the end of processing each message.

If during the downloading phase of the new SMS messages the memory reserved to SMS receipt becomes full, all received messages will be lost. If so, remaining alarms remain active.

The possible causes of a full memory are:

• Receipt of three or more messages with the maximum length (11 variables setting) within two minutes

• Receipt of seven or more short messages (a variable setting) within two minutes.

LAN settings

The pCO controller can be enabled for the automatic management of a Local Network connected to more than one unit (up to a maximum ten), of which some are in operation and others in stand-by (up to a maximum two units). In the default configuration this is set to “NO LAN”. A single unit can operate temporarily if the address of the board is equal to one.

This screen states:

• Number of units in the Local Network has to be set (up to a maximum ten units)• Start-up of the stand-by unit in the event of malfunctions on a unit connected in the LAN• Rotation time to allow the workload to be shared between the units at programable time intervals

(by setting cycle time = h 000, the controller runs a test, rotating the units at two-minute intervals)• Possibility of having one or two units in standby• Possibility to start the stand-by unit only in the event of alarms (the rotation time is disabled)

The next screen, displayed only if the Local Network is set, gives the possibility to control unit operation with a mean temperature measured in the room or with the “local” value measured by the sensor inside the unit:

• “Local Values” mode: unit control of the temperature and humidity values are read by the sensors in the unit

• “Mean Values” mode: Unit control of the temperature and humidity values are read by the sensors in the active connected units in the Local Network.Whatever the difference between the mean value and the sensor reading exceeds the value “Mean/Loc.Diff.” (default equal to 2°C, 3.6°F), the control automatically exchanges from the “Mean” mode to the “Local” mode.


The “Exclude From Rotation” parameter enables excluding the unit from the rotation time management by working in Stand-Alone. If required, this function must be enabled for an individual unit. The second parameter, displayed only if the floor air pressure transducer system (AFPS) is configured (used to manage floor air pressure control) in local mode or with mean values.

Stand-by rotation alarms

This screen is displayed if the Local Network is configured and is used to manage the start-up of the stand-by unit when an alarm is activated.


Clock and Calendar SettingsIf the microprocessor is installed with the optional clock circuit, the date, time, and weekday is shown in the Status screen.

The clock settings correspond with:

• Start up and shut down of the unit according to timed program• Alarm events recordings

To set the time/date and to program the time bands use the following screens.

In this screen, set:

• Time (hours, minutes)• Date (day, month, year)• Weekday

Time bands

This device sets the automatic start up and shut down of the unit on a temporary basis (time bands) to obtain:

• Up to 3 on-off daily cycles, each with start up and stop time• Weekly cycle distinguishing the daily cycles divided into

regular days N (default is from Monday to Friday), pre-holiday P (default is on Saturday), and holidays F (default is on Sunday)

By setting “Yes” the time bands device is activated; in field C of the Status screen the Time icon appears. The three adjacent screens show programmed time cycles – characterized by a start time (On) and a stop time (Off) – of the regular days (N), pre-holidays (P), holidays (F).

With a stopped unit (“Programmed Stop - Re-Start. At...”), the icon appears in the display with the time and weekday that is programmed for the next start-up. By setting 00:00 in the On or Off the cycle is ignored.


Configuring weekdays

This screen is displayed when the time bands device is activated (“Unit On-Off Cycle”: Yes). The present day is shown (at the end of the programming of the time bands):

• N: Regular day or holiday• P: Pre-holiday• F: Holiday

To change the classifications, press ENTER to move to next screen or press the DOWN button.

Weekly program

The microprocessor memory is classified as:

• Regular days (N) all week days from Monday to Friday• Pre-holidays (P) Saturday• Holiday (F) Sunday

Use this screen (moving from previous screen by pressing the ENTER button) to change the classification of the seven days to come, including the actual day that is shown on the first line of the screen.

Under each day there is a recorded classification (N or P or F) that can be modified by pressing the UP or DOWN button until finding the wanted classification By pressing the ENTER button, the set classification is confirmed and the next day is selected.

If the classification differs from the standard, the symbol “>” appears automatically before the classification.The selected time bands are the same as the days of the classification. The selection of the time bands is cancelled automatically once the day for which it was activated has passed. To exit from the time-calendar and time bands screens press the ESCAPE button.


Service Menu DescriptionThis part of the program is used to configure the devices installed on the unit and their operation. These operations should be performed by certified personnel.

Note: This manual describes the functions of the program in general and that based on the configuration set, the fields, and configuration screens may be enabled or disabled.

To access this section:

1. Press the PROGRAM button.2. Select the “Service Menu.”3. Press the ENTER button.4. Enter the service password by pressing UP or DOWN button.5. Press the ENTER button.

Hardware settings

If the memory is cleared in the controller, the unit needs to be “reconfigured” based on how it was originally ordered from the factory. In this phase it is necessary to define all the elements of the unit that the microprocessor must control.

As a rule, this function is only required when the unit is in the factory during final inspections; it can, however, be used in the field for troubleshooting purposes or for unit modification.

The screens that refer to this configuration are reserved for technicians only:

• Small Unit: NO• Unit Type: identifies the type of unit between DX, CW, ES, TC• Compressors: identifies the number of compressors installed on the unit (maximum 4)• Refrigerant Circuits: identifies the number of refrigerant circuits (maximum 2)• Compressor Type: identifies the type of compressor installed • Heaters: identifies the number of operating stages of the electric heaters installed• Hot Water Coil: enables operation of the hot water coil/valve• Hot Water Coil Out: enables the hot water coil/valve operating through analog output Y4.

This screen is used to configure:

• Hot Gas Coil: enables operation of the hot gas coil/valve in the DX models

• Exter.Hum. (on/off): enables operation of external humidifier via an on/off contact from a digital output on the control board


• Humidif. 0-10V: enables operation of the external humidifier via the 0-10 Volt analog output Y2

• Dual Coil: enables the configuration for CW Dual Coil units• Water Valve Type: determines the number of ports on the water

valves in the CW model• Phases Seq. Control: enables the possibility of managing the phases

sequence control in the CW modelThis screen is used to configure input 1 as an optional supply temperature sensor (Deliv.Temp.Sensor) or as the setpoint remote control (Setp.Remote Control).

This screen is used to configure digital input 5 as:

• No switch connected: no connection• Summer/Winter Switch: change operating season in the CW model• Water Flow Switch: water flow switch

In the CW model, the operating season can be changed over, in alternative to the digital input, from the user terminal, on the setpoint screen, or via serial connection (supervisor).

This screen and the following are used to configure digital inputs 2/4/6.

This procedure allows the activation of digital inputs ID2-4-6 if optional kits are installed. The kits include fire and smoke sensors, flood sensors, and high/low outside temperature and humidity sensors that must be connected to a specific input.

First verify that multifunction inputs have not been previously configured. The table below shows a detailed description of each input, with the corresponding function:

Digital Input 2 Digital Input 4 Digital Input 6Not Used Not Used Not Used1. Flooding Sensor2. Remote ON/OFF3. Change Setpoint4. User Configuration:

· Alarm signalling· DX/CW Switch-Over· Emergency Working

1. Smoke-Fire Sensor2. Remote ON/OFF3. Change Setpoint4. User Configuration:


1. External Limit Sensor2. Remote ON/OFF3. Change Setpoint4. User Configuration:



If the digital input chosen is configured as “User Configuration,” the following screen is used to select the other functions:

• Alarm signalling: Alarm signal coming from a component outside of the unit

• DX/CW Switch-Over: External digital contact for changing over operating mode of the unit (TC model only)

• Emergency Working: Signal coming from a component outside of the unit (the Status screen will display the warning icon)

In addition, the status of the contact can be defined, N.O. or N.C.

This screen is displayed if the remote setpoint control is enabled.

Remote setpoint control sets the parameters relating to the remote control of the unit operating value.

Connect a 20Kohm high precision (1/1000) resistance in a series to terminal B1 of board UpCO1 or to terminal B3 of board UpCOE; apply a 0-10V signal between this terminal and the GND terminal (check attached wiring diagram). The zero adjustment is automatic using the “Hardware Setup” function.

It enables determining:

• Minimum and maximum signal in Vcc (from 0 to 10 Vcc)• Minimum and maximum offset to be calculated depending on Vcc in input

Example: At a minimum value set that with 0 Vcc there is an offset of 0.0°C (0.0°F), whereas to a maximum value of 10 Vcc set an offset of 5.0°C (9.0°F). The control, depending on the signal sent to it and read through the used analog input, calculates the offset to be added to operating setpoint.

It is used to configure:

• Anti-Hunting Time: Enables setting the anti-hunting time of the final calculated setpoint• Active Signal: Active signal in tension read by the analog input of the board• Active Offset: Active offset calculated based on the set “Signal V” and “Offset °C” parameters

This screen, available if the AFPS is installed, is used to define:

• Range Begin: Transducer reading start range value • Range End: Transducer reading end range value• Read Value: Value read by the sensor• Delta: Maximum variation of the input without activating the filter• Time: Duration of the filter• Value: Value read by the sensor



This screen is used to establish:

• Fan Speed: Rated fan speed• Fan Supply: Number of phases in the fan power supply• Fan Signal: Signal for modulating the fan speed• Dehumidification Fan Speed: Rated speed in the dehumidification

phase (for Amico units with mechanical thermostatic valve only)• Modulation with Air Pressure Enabled: Enables fan speed modulation with the AFPS system• Air Press. Transducer: Determines whether the transducer is installed on the unit


• Minimum Speed-DX: Minimum speed in TC models only• Minimum Speed: Minimum fan control speed• Maximum Speed: Maximum fan control speed


• Setpoint: Reference pressure value to be maintained by modulating the fan speed

• Dead Band: Control dead band• Regul. Band: Control proportional band • Integral Time: Integral time• Derivat. Time: Derivative time• Air pressure: Value read by the sensor• Evaporating Fan: Evaporator fan control percentage


• Alarm Level: Low air pressure alarm activation threshold• Alarm Delay: Low air pressure alarm activation delay time

This screen is used to establish:

• Enable: Enables fan speed control associated with the opening of the water valve (CW model only)

• Minimum Speed: Minimum fan control speed• Maximum Speed: Maximum fan control speed

This screen allows enabling fan start-up at maximum speed (100%) for a maximum time of 10 seconds, in units with single-phase fan.

This screen is used to establish which resources remain active in the event of emergency operation, activated by a multifunction digital input ID2/4/6 configured as “User Configuration - Emergency Working.”

This screen, displayed only when the electronic expansion valve is installed, is used to establish the activation of the low pressure alarm by the pressure transducer connected to the driver, setting:

• Normal Limit: Rated operating pressure• Alarm Diff.: Differential pressure due to the activation of alarm BP• Alarm Delay After Compr. On: Alarm BP activation delay time from

compressor on• Alarm Delay Normal Working: Alarm BP activation delay time

during normal operationThis screen, displayed only when the expansion valve is installed, is used to establish the activation of the low pressure alarm by the pressure switch connected to ID6, setting:

• Alarm Delay After Compr. On: Alarm BP activation delay time from compressor on

• Alarm Delay Normal Working: Alarm BP activation delay time during normal operation

This screen, displayed only if the multifunction digital input is enabled, is used to set:

• Off Unit on Alarm: Enables the shutdown of the unit if the flood alarm is activated

• Valve Closed on Al.: Enables the closing of the water valve if the flood alarm is activated

This screen is used to set:

• On/Off mode Via input contact: Enables unit on/off via the multifunction digital input

• On/Off mode only Via serial: Enables unit on/off from BMS• Motorized Damper: Enables operation of the damper• Opening Time: Damper opening time (during this period the start of

the fan and the air flow alarm are ignored)• Mot. Damper Output: Damper control output


• Backlight Time: Time the display backlighting remains on (this time also coincides with the timeout for entering the password)

• Buzzer Type: Enables operation of the buzzer• Time On: Time the buzzer remains on


This screen is used to set the mains frequency (automatic or manual).

This screen is used to set the unit serial number.

The serial number can be found on the nameplate found inside the electrical panel.

Software settings


• Anti-Hunting Time Constant: the time constant for the temperature control action to avoid excessive temperature swings around the setpoint (the higher the thermal inertia of the air-conditioned environment, the higher the value needs to be set)

• Humid.C.Type: Humidity control type between relative (rH%) or absolute (g/Kg)

• Dehumid.Control: Enables dehumidification control (only if the humidity probe is installed)• Dehum.Open Valve: Maximum opening percentage of the cold water valve during

dehumidification phase in Cooling Water mode• Capacity Limitation: Activation of the capacity of the water coil in the Cooling Water units during

dehumidification phase• Cap. Lim.: Capacity logic between Standard or Advanced mode

This screen enables setting the parameters for the advanced adjustment logic of dehumidification.

Example: If the opening of the valve is greater than the “Threshold Valve” value equal to a time of “Observ.Time,” it means that the heat load is high and, therefore, the coil is not partialized; whereas if opening is lower, the water coil is partialized.

This screen is enabled to set the atmospheric pressure (millibar) depending on the different geographical areas for calculating the absolute humidity value in g/Kg.



• Deliv.T. Low Limit: Enables minimum air outlet temperature control• Deliv.T. Set Limit: Minimum air outlet temperature setpoint (if the

function is enabled and the delivery air temperature is near Deliv.T. Set Limit setpoint, control starts to disable the active resources, meaning switch-off the compressors for the DX units or close the valves for the cooling water units)

This screen is used to set the PID adjustment parameters in Cooling and Heating mode:

• Integral Time: Time constant of the integral action• Derivative Time: Time constant of the derivative action• Dead Zone: Dead adjustment zone

This screen is used to set the type of control for the operation of the external humidifier via the 0-10V signal sent by the board.

These screens are used to make the settings for the condensing circuit on:

• DX units• TC or ES units, during the mechanical cooling phase with only the

compressors on

The controller keeps the water temperature in the closed circuit at a suitable value for condensing: between the setpoints plus a fixed differential of 6°C (10.8°F).

The temperature is controlled by managing the operation of the DryCooler fans (“Rad-Cooler”) connected to the indoor unit control:

• “On-Off”: Operation of the radiator fans is either on or off• Modulating (“Modul”): Control of the 0-10 V signal sent via analog output Y1 to manage the

radiator DryCooler fan speed


This screen is only available in the Twin-Cool model and is used to manage the settings for activating the changeover from mechanical cooling operation to operation with CW.

To avoid continuously alternating between the two operating modes, there is a minimum interval of 30 minutes between two consecutive activations of the cold water valve.

If the high room temperature limit is exceeded (default: 30 °C, 86 °F), the unit automatically switches from CW operation to DX operation, signaling the “High cold water temperature or valve fault” alarm.

This screen is only available in the Twin-cool model and is used to enable CW operation only if the alarm is activated in DX mode or via multifunction digital contact or by BMS.

This screen is used to set the type of control in CW mode:

• Room Temperature: Unit controls the return air temperature• Delivery Temperature: Unit controls the outlet air temperature

This screen is only available in the CW model and is used to establish the dehumidification settings on CW units and calibrate the high temperature alarm (only if the inlet water temperature probe is installed).


During the dehumidification phase, a special control function is activated, which acts as follows:

• The controller sends the chiller a request for water at a lower temperature to allow dehumidification; this is done by instantly activating digital output DO7.

• Temperature probe located on the CW inlet is read.• When the value read reaches the “setpoint” as set on the screen, the valve is opened to the

maximum position on the following screen.• If the “setpoint” is not reached, after 15 minutes an alarm is signalled (“CW too warm to

dehumidify”).The temperature probe on the CW inlet is also used to control the “High CW temp.” alarm, when the temperature exceeds the ‘High Temp.’ value set on the screen, signaling a possible fault on the chiller.

This screen is only available in the TC model and is used to enable the variation in the chiller cooling setpoint for dehumidification.

This screen is used to set the setpoint that triggers the switching between the two heating systems.

This screen concerns the behavior during the initial transients and is used to set:

• At Power On: Delay in restarting the unit after a power failure; this is used to prevent simultaneous starts in multiple installations (units in the LAN automatically feature a sequence start-up progressive [unit 1, unit 2, …] with 5 second intervals between one unit and the next)

• Regul. Transient: Period of time between when the unit starts and control commences (this is the initial period required for the control system to become stable; in this period the air flow switch reading is also ignored allowing the unit to start without the “No air flow” alarm being activated, particularly on units with motor-driven dampers)

• Fan Off Delay: Fan shutdown delayThis screen is used to set:

• T+H Al. Delay’: Delay in signaling room alarms when starting the unit and in normal operation

• Wrong Phases Sequence or Phase Loss: Minimum unit Off time if the alarm is activated

This screen enables setting the Min. OFF Time of the electric heaters after activation of the “Heaters Overheating” alarm.


This screen is used to change the access passwords for the:

• Settings (settings password)• Configuration (configurations or service password)

Since access to the “Hardware Menu” is denied unless the corresponding password is known, the new password should be written down before changing the old one.


• Anti-Hunting Time Constant: Control time constant• Delay Com. Error: Delay for the communication error between the

unit and the Master Control• Start Com. Trans.: Initial communication transient

The last line indicates the status of communication between the unit and the Master Control.

Sensors settings

This screen adjusts control of the temperature sensors (“Room Temp.”, “Ext. Air Temp.”, “Delivery Temp.”, “CW Closed And Hot Water”, “Room Humidity”) in case a difference between the measured value of the sensor and the effective value is detected when measured with a precision instrument.

The adjustments can be done at intervals of 0.1 °C (.18°F) and the maximum adjustment possible is between -9.9°C (-17.82°F) and +9.9 °C (+17.82°F).

The Read value is the measurement transmitted by the sensor already corrected. The adjustment (“Adjustment”) is the quantity that needs to be added or subtracted to obtain the correct value when measured with a precision instrument.

Alarm reset mode

This screen and the following are used to set the alarm resets to manual or automatic.


Memory operations

This screen manages the data contained in the microprocessor Flash EPROM.

• Program Setup: Operation that is carried out the event of Flash EPROM substitution (it can be useful if data is ‘damaged’ as it is possible to clean the memory–including data relative to the unit HARDWARE configuration, where all the setpoint values reset automatically).

After this operation it is necessary to re-configure the control and set the setpoint (when different from those of the default).

Warning: When modified, a parameter of the configuration (and Flash EPROM substitution) is necessary to empty the RAM memory by cutting off the power to the control for a few seconds.

• Alarm Page Clear-Up: Historical alarm that cancels the last 100 saved alarm events• Hardware Setup: Automatic identification of the devices connected to the control (this operation

is useful when an optional device must be connected to the board, when substituting a sensor or when the temperature sensor display shows a “NC” reading).

EXV valve settings

This screen and the following are only displayed if the electronic expansion valve is configured, and are used to access the valve operating settings.

Main settings

This screen enables choosing the electronic thermostatic different for the two refrigerating circuits:

• Valve Type: Model of electronic valve used• Refrigerant: Type of refrigerant gas used


• Low Super Heat (SH) Protection: Activates the Low SH protection that quickly acts by closing the valve in case of too low a SH temperature (this avoids liquid returning to compressor)

• Maximum Operating Pressure (MOP) Protection: Activates the MOP protection that moderately closes the EEV valve to limit the evaporator temperature (this prevents the compressor from stopping from thermal protection)

• MOP Set: MOP activation set• Low Operating Pressure (LOP) Protection: Activates the LOP protection that quickly acts by

opening the valve when the evaporator temperature is too low (this avoids the compressor stopping from low pressure)

• LOP Set: LOP activation set



• Range Begin: Start scale for the evaporator pressure transducer reading• Range Ending: End scale for the evaporator pressure transducer

reading• Read Value: Value read, i.e. the measurement sent by the pressure

transducer• Cond.Press.Range: Enabling condenser pressure reading• Range Begin: Start scale for the condenser pressure transducer reading• Range Ending: End scale for the condenser pressure transducer reading• Read Value: Value read, i.e. the measurement sent by the pressure transducer

If the measured value of the evaporator pressure sensor does not match the effective value when measured with a precision instrument, the pressure reading can be adjusted using the Press.Offset parameter. The maximum adjustment possible is between -6.9 bar (-99.9 psi) and 6.9 bar (99.9 psi). The read value is the measurement transmitted by the pressure evaporator sensor, including the correction factor.

If the measured value of the evaporator temperature sensor does not match the effective value when measured with a precision instrument, the temperature reading can be adjusted using the Temp.Offset parameter. The maximum adjustment possible is between -9.9°C (-17.82°F) and +9.9 °C (+17.82°F). The read value is the measurement transmitted by the temperature evaporator sensor, including the correction factor.

This screen corrects the pressure of the condensing sensor reading. If the measured value of the sensor does not match the effective value when measured with a precision instrument, the sensor can be adjusted using the Press.Offset parameter. The maximum adjustment possible is between -6.9 bar (-99.9 psi) and 6.9 bar (99.9 psi). The read value is the measurement transmitted by the pressure evaporator sensor including the correction factor.


• Low Superheat: Low superheat alarm activation delay time• High Suct. Temp.: High suction temperature alarm activation delay

time• LOP Failure: Low operating pressure alarm activation delay time• MOP Failure: Maximum operating pressure alarm activation delay time• Press. Probe Failure After Compr. ON: Pressure probe disconnected or not working alarm

activation delay time after the compressor starts• Press.Probe Failure At Normal Work: Pressure probe disconnected or not working alarm

activation delay time in normal operation


This screen is used to manually set the opening steps for the electronic expansion valve.

This screen is used to set the closing steps for the electronic expansion valve when there is no cooling request.

Advanced settings

This screen enables setting the SuperHeat set for Individual Circuit: Overheating Setpoint.

This screen is used to set for Circuit 1:

• Dead Zone: Dead band• Prop.Gain: Proportional gain• Integral Time: Integral time


• Derivat. Time: Derivative time

This screen is used to set for Circuit 2:

• Dead Zone: Dead band• Prop.Gain: Proportional gain• Integral Time: Integral time


• Derivat. Time: derivative time

This screen is used to set for an individual circuit:

• Max Suct. Temp.: Maximum suction temperature• Circ./EEV Ratio: Ratio expressed in percentage between the maximum

cooling capacity of the circuit regulated by the EVDriver and that obtainable with maximum opening of the expansion valve in the same operational conditions



• Low Limit: Low superheat minimum limit

This screen is used to set for single circuit:

• Integral Time: Integral time to low superheat


• Start-up delay: Maximum operating pressure protection delay time when starting


• Integral Time: Integral time for maximum operating protection


• Integral Time: Integral time for minimum operating protection


• Dehum.SH Set: Superheat setpoint in the dehumidification phase• LOP Limit: Minimum operating pressure limit in the dehumidification

phase

This screen enables setting the operation parameters of the expansion valve for Circuit 1:

• Enable: Enables the regulating mode• Time:s: Maximum activation time of the operation parameters of the

expansion valve after the staging ON of the compressor• SuperHeat Set: Superheating setpoint• Dead Zone: Dead adjustment zone• Prop. Gain: Proportional regulation gain• Integral Time: Integral regulation time• Derivat.Time: Derivative regulation time


This screen enables setting the operation parameters of the expansion valve for Circuit 2.

Manual control

During normal operation, all the components installed on the unit are managed automatically. To assist maintenance and checks or in cases of emergency, the individual components can be activated manually and independently of the control process:

• Unit fan (Unit Start-Up)• Compressor 1/2/3/4 (Compressor 1/2/3/4)• (On CW units) analog output 0/1 (Y0/Y1Ramp%)• Dehumidification function (Dehumidification)• First electric heater stage (Reheating 1)• Second electric heater stage (Reheating 2)• 0/1 analog output on DX, TC, ES units (Y0/Y1Ramp)

Operating modes

To change the operating mode of a component, simply move the cursor to the corresponding line, press the UP or DOWN button to change from automatic (“No”) to manual (“Yes”) or vice-versa, and confirm by pressing the ENTER button.

The next screen can also be used to set, as a percentage, the opening of the devices connected to analog outputs Y1, Y2 and Y3.

When activating one or more components manually, the STATUS screen will

show the icon.


Updating the ProgramThe following systems can be used to update and acquire the firmware and the logs on the pCO controllers:

• Winload• SmartKey programming button

Winload

On all pCO system controllers the firmware can be updated using a PC. For this purpose, Schneider Electric SAS provides the WinLoad32.exe program and a serial converter with USB-RS485 output to connect to the pCO via the telephone connector. The special driver, supplied by Schneider Electric SAS, must be installed on the PC.

The WinLoad32.exe program is installed together with the pCO Manager program. The installation includes, in addition to WinLoad32.exe, the user manual and the driver for the USB-RS485 converter.

SmartKey

The SmartKey programming button can also be used to update the controller firmware, with the sole exception of the Boot, which is not loaded by the SmartKey. In addition, the key can clone the contents of a pCO and then copy these to another pCO that is identical to the first, via the telephone connector on the terminals (the pLAN must be disconnected). The key can also copy the data logged by a series of pCO devices to a PC.

On the PC, using the SmartKey Programmer, the key can be configured to run certain operations, such as acquire logs, program applications, and program the BIOS.

The following are some images showing examples of downloading the program to the pCO control board:

Inside the kit is a CD and a manual with step-by-step explanations of how to best use these accessories. The program files will be sent by e-mail or CD, indicating the name of the application.


AlarmsActive alarms

By pressing the ALARM button, the alarm will be silenced and a description of the alarm will be displayed. If the cause of the alarm has been eliminated, the last alarm message can be reset by pressing the ALARM button for several seconds (the red light on the button will turn off immediately). If the cause of the alarm has not been eliminated, the alarm buzzer will be activated again.

Alarm history

In order to be able to reconstruct the alarm history sequence, the microprocessor holds 100 alarm events in its memory. All of the set alarms can be read in series by entering the status screens by pressing the UP and DOWN buttons and choosing the “Alarm History” option (if there is a clock card). The time and date will also be recorded for each alarm event. The alarms activated when the counter threshold is exceeded are not recorded and therefore cannot be read.

Alarm events

All of the possible alarm messages that can be displayed on the user terminal are shown below. For active alarms (not recorded in the alarm history sequence), some possible suggestions will appear for solving the problem in the last two lines of the display:

• Incorrect Phase Sequence: The Scroll compressor must rotate in the correct direction, otherwise there will be a loss of efficiency. In single units with a three-phase power supply it is possible that the phase sequence of the network forces a rotational direction that is different to that which has been planned; in this case, as soon as the unit is connected to the power supply, the microprocessor immediately enters into an alarm state blocking any other type of operation.If this occurs, disconnect the power supply and invert the two phases of the power supply.

• Power Supply Return Signal: When the power supply is restored following a break in the power supply, the control records the screen, shown here in the alarm history sequence.



Exceeding temperature or humidity limits

These are alarms that are activated when the set temperature/humidity limits are exceeded.

• Signal only: Can be delayed during the unit start-up phase (the default delay is 15 minutes)

Optional sensor or digital input alarms

These alarms are connected to the optional sensors and/or the configured digital inputs (see the Hardware Settings screen).

Signal only: For Uniflair Cooling Units (frame sizes 3-6).

Activated by the Smoke / Fire sensors (always causes the unit to switch off).

Activated by the leak detection control module or from the condensate pump alarm contact (only causes the unit to switch off if it has been chosen as a second level alarm, but it does not activate the stand-by unit).

Activated by a digital input configured as “Alarm Signalling” (ID2, ID4, ID6).

Unit function alarms

These are alarms connected to the unit components and which are caused by the intervention of a protection device:

Fan alarm: Activated by the differential air flow pressure switch (FS) and causes all of the devices to switch off – compressors, electrical heaters, humidifier, fans).

Activated by the differential high air flow (FSA): Causes all of the devices to switch off – compressors, electrical heaters, humidifier, and fans.

Activated by the differential dirty filter pressure switch (PFS): Only causes an alarm signal, without unit operation being affected (indicates that the air filter needs to be cleaned or replaced).

Alarm signal activated by from the overheat switch (TSR): Causes the electrical heaters to switch off.

DX, ES, TC units only: Causes the compressors to switch off on the circuit indicated (1 or 2); check the refrigerant circuit and/or refrigerant charge and high pressure switch).

DX, ES, TC units only: Causes the compressors to switch off on the circuit indicated (1 or 2); check the refrigerant circuit and/or refrigerant charge and high pressure switch. This alarm also specifies the number of the circuit).

CW units only: Activated by the CW flow switch which signals a lack of water within the hydraulic circuit).


CW units only (signal only): Activated by the CW temperature sensor when the setpoint value is not reached within 15 minutes of the dehumidification request.

CW units only (signal only): Activated by the CW temperature sensor when the high temperature limit is exceeded.

TC units only: Causes the changeover from CW operation to DX (it is also displayed when the ambient temperature sensor detects that the limit set has been exceeded for the first time.

Activated on a loss in communication between the UpCO1 control board and the UpCOE expansion board in the Twin-Cool Water-Cool model.

Activated when the controller cannot automatically detect the mains frequency.

Electronic expansion valve alarms (DX, TC, ES units only)

These alarms which are connected to the driver of the EVD400 electronic expansion valve, causing the compressor/s to switch off:

Activated when there is low evaporator pressure, or rather, when the LOP is lower than the threshold which has been set, for a period which is longer than the Alarms Delay LOP. This alarm also specifies the number of the circuit.

Activated when there is excessive evaporator pressure, or rather, when the MOP is higher than the threshold which has been set, for a period longer than the Alarms Delay MOP. This alarm also specifies the number of the circuit.


Activated following an error in the signal given by the low pressure transducer or a lack of working pressure caused by the compressors not being switched on.

Activated following an error in the signal given by the NTC low pressure temperature sensor for the superheating reading. This alarm also specifies the number of the circuit.

Activated following an error in the EEPROM memory of the driver. This alarm also specifies the number of the circuit.

Activated when there is low superheating, for a period which is longer than the Alarms Delay Low SH. This alarm also specifies the number of the circuit.

Activated following an error in the LAN connection between the EVD400 driver and the pCO1 control board. This alarm also specifies the number of the circuit.

Activated following a temperature measurement taken by the EVD400 sensor, which is higher than the threshold value set in the High SH. This alarm also specifies the number of the circuit.

This is only displayed in the alarm history when the driver is without power for more than 5 seconds when the compressor is operating. This alarm also specifies the number of the circuit.

Sensor alarms

These are activated when there is a malfunction of the sensors, or they have been incorrectly connected to the main board:

Note: If one of these alarms is activated, check the exact configuration set, that the sensor is present, and that the connections have been made and are operating correctly.


Activated following an error signal from the sensor which is connected, disabling the unit operation linked with the reading.

Causes the compressors and electric heaters to switch off, keeping only the fans switched on.

Disables the free-cooling operation control (only ES units).

Disables the re-heat electric heaters.

Disables the hot water re-heat electric heaters (optional).

Signal only.

Signal only.

Disables humidification / dehumidification operation.

Service note

These are signalling alarms which are activated when the operating hours of the component are exceeded.

Note: This type of alarm, which continues until the counter is reset, is not recorded in the historical alarm sequence.

Signal only: This may concern the air filters, the unit, the compressors, the electric heaters and the humidifier. To reset the alarm it is necessary to zero the counter.


The screen for setting the alarm thresholds and zero the counter can be found in the “Parameters Menu.” If the threshold is set at 0 hours, the alarm will not be activated.

LAN interrupted alarm

Indicates problems of communication between units in the LAN and specifies which units are not connected. This may be due to a break in the power supply, a malfunction in the serial card or an interruption in the electrical connections between the units.

The alarm appears on the units with lower addresses in the network, both up and downstream of the interruption.

System alarms

Indicates a writing error in the EEPROM memory, probably due to the cancelling/writing cycle being exceeded. The board needs to be replaced.

Access alarms

This refers to an attempt at accessing the setting or configuration screens by entering the password incorrectly 3 consecutive times. To reset the alarm, carry out the following procedure:

1. Press the PROGRAM button and select “Service Menu.”2. Enter the password and press the ENTER button.3. Exit by pressing the ESCAPE button until the main screen is reached.4. Press the ALARM button again to reset the cycle and then keep it pressed for another 3 seconds

to reset the alarm completely.

Remote alarm signalling

For remote signalling of the alarm status, the following voltage-free dry contacts are available on the microprocessor control board:

• Type A alarm• Type B alarm

If there are several units, the wiring of the dry contacts must be carried out independently for each unit. To select the type A or B and the state of the contact, select the “Parameters Menu” and choose the Alarm Contact option.


Default ValuesCONFIGURATION NUMERICAL PARAMETERS

PARAMETER DESCRIPTION DEF. PARAMETER DESCRIPTION VAL. DEF. MIN. MAX.

CONTROL PARAMETERS SetpointHeating No Cooling setpointHot water coil No with Room Temperature °C 23.0 17.0 35.0Hot gas coil No Cooling Propor. Band °C 1.5 0.5 9.9External Humidifier (On/Off) No 2nd cooling setpoint °C 17.5 17 35External Humidifier (0-10V) No Cooling setpointDelivery sensor No with Delivery Temperature °C 17.0 17.0 35.02nd Cooling SetP. of the remote No Cooling Propor. Band °C 15.0 0.5 18.0Flooding No Heating setpoint °C 23.0 12.0 30.0Smoke/Fire No Heating Propor. Band °C 1.5 0.5 9.9External sensor No Dehumidifier setpoint rH % 55 20 90AFPS No Dehumidifier Propor. Band rH % 05 03 15Disable BP transitory start limit No Humidifier setpoint rH % 45 20 90Off unit with flood alarm No Humidifier Propor. Band rH % 05 03 20Off water valve with flood alarm No Delivery T. Set Limit °C 14.0 10.0 25.0Remote On/Off of via digital input No SETPOINT COMPENSATIONRemote On/Off of via serial No P1:Delivery SetP. °C 17.0 14.0 35.0Motorized damper No P1:Room Temp. °C 22.0 17.0 35.0Buzzer enabled Yes P2: Delivery SetP. °C 18.0 14.0 35.0Dehumidification Yes P2: Room Temp. °C 20.0 17.0 35.0Humidification No SET ALARMSSetP. change of the Dehum. CW No High Room Temp. °C 30.0 20.0 40.0Enabled High T.Delivery alarm No Low Room Temp. °C 10.0 0.0 32.0SetP. compen. of the CW working Yes High Room Humidity rH % 80 40 99Enabled setback mode No Low Room Humidity rH % 30 0 65Enabled Fan Cyclical Start No High Delivery Temp. °C 23.0 10.0 40.0Enabled ON/OFF cycle No SETBACK MODE“A” AND “B” ALARMS TYPES Min. Room Temp. °C 16.0 5.0 24.0Loss of Air Flow A Max. Room Temp °C 28.0 20.0 35.0Clogged Filters A Min. Room Humidity rH % 35 20 60Heaters Overheating A Max. Room Humidity rH % 75 50 90EEPROM Failure A Fan cyclical start time min 30 15 99Wrong Password A TIMER THRESHOLDHigh Air Flow A Timer threshold h 0 0 32000High Cond.Pressure A CHANGE PASSWORD *(password found in the envelope enclosed with unit)

Low Evap.Pressure A Password Settings n° xxxxx 00000 32000EXV Valve Failure A Password Service n° xxxxx 00000 32000High Room Temp. A LAN SETTINGSLow Room Temp. A Lan units number n° 0 2 10High Room Humidity A Cycle time h 168 1 98Low Room Humidity A Number of Stand-by units n° 1 1 2


CONFIGURATION NUMERICALS PARAMETERS


High Water Temp. (C1/C2) A DELAY SETTINGSLow Air Pressure A Integral Time s 600 0 2000AFPS: Expansion Board A Anti-hunting time constant min 1 0 30CW Dehumid. Failure (C1/C2) A Unit Start Up Delay At Power On s 0 0 300D.C.: Expansion Board A Operation s 60 15 200Supply Frequency A Fan Off delay s 10 10 60Wrong Phases Seq. A Temp/Hum.Alarms DelayRoom Temp.Sensor A After Power ON min 10 0 99Room Humid.Sensor A Normal Working s 60 0 999Delivery Temp. Sensor A Wrong Phases Sequence Min.OFF Time s 60 5 999Outdoor temp. Sensor A OTHER RESOURCESWater IN Temp. Sensor (C1/C2) A Motorized damper time s 120 20 300Water OUT Temp. Sensor (C1/C2) A Backlight Time s 300 30 999Hot Water Temp. Sensor A Buzzer On Time min 5 1 999Air Pressure Sensor A SENSOR ADJUSTMENTLoss of Water Flow A Adjustment °C 0.0 -9.9 +9.9Smoke/Fire A COMPRESSORFlooding A Transitory limit BP bar 0.2 0.1 5.0Local Network A BP Alarm normal limit bar 2.0 0.9 5.0Humidifier Failure A BP Alarm differential bar 1.3 0.1 5.0External Sensors A BP Alarm after compress. ON s 180 30 240High Delivery Temp A BP Alarm at normal work s 6 2 10Unit Run Hours A Minimum OFF compr. time s 60 60 600Filter Run Hours A Minimum OFF compr. time s 60 0 999Compress.Run Hours A Minimum time 2 starting s 360 360 600El.Heaters Run Hours A AFPSHumidif.Run Hours A Air transducer press Range Begin. Pa 0 -6250 6250Alarm By ID2 A Air trisector press Range End. Pa 100 0 6250Alarm By ID4 A Delta Input Filter Pa 4.0 -9.9 +9.9Alarm By ID6 A Time Input Filter s 1 0 99STAND-BY ROTAT. ALARMS Min. speed fan % 55 40 100Loss of Air Flow Yes Max. speed fan % 100 40 100Clogged Filters No Setpoint Pa 20.0 0 6250Heaters Overheating Yes Dead Band Pa 0.0 0 6250EEPROM Failure Yes Regul. band Pa 160.0 0 9999Wrong Password No Integral time s 40 0 999High Air Flow Yes Derivat. Time s 0 0 999High Cond.Pressure Yes Alarm level Pa 15.0 0 6250Low Evap.Pressure Yes Alarm delay s 60 0 999EXV Valve Failure No ENERGY SAVING SETTINGSHigh Room Temp. No Energy Saving Temp. °C 8.0 5.0 24.0Low Room Temp. No Summer Temp. °C 28.0 15.0 40.0High Room Humidity No Active radcooler setpoint °C 28.0 15.0 40.0Low Room Humidity No ON Radcooler fan at E.S. °C 8.0 1.0 15.0High Water Temp. (C1/C2) No E.S. setpoint (Room T.-Water T.) °C 6.0 1.0 15.0


CONFIGURATION NUMERICALS PARAMETERS


Low Air Pressure No TWIN-COOL SETTINGSAFPS: Expansion Board No CW enable Setpoint °C 7.0 7.0 25.0Room Temp.Sensor Yes CW deactivation Setpoint °C 3.0 0.0 9.9Humidity Sensor Yes COOLING WATER SETTINGSDeliv.Temp.Sensor No Dehumidification setpoint °C 7.0 5.0 20.0Outdoor Temp.Sensor No High water temp. alarm (C1/C2) °C 15.0 5.0 80.0Water In Temp.Sens. (C1/C2) No Open valve at alarm (C1/C2) % 0 0 50Water Out Temp.Sens. (C1/C2) No P1 Dual Coil % 100 0 100Hot Water Temp.Sens. No P2 Dual Coil % 0 0 100Air Pressure Sensor No Hot Water Coil setpoint °C 40 25 60Loss of Water Flow No EXV VALVEFlooding No MOP Set °C 14.0 -50.0 70.0External Sensors No LOP set °C 02.0 -50.0 70.0Humidifier Failure Yes Pressure Probe Range Begin. bar -01.0 -99 999High Delivery Temp. No Pressure Probe Range Ending bar 09.1 0 999CW Dehumid.Failure (C1/C2) No Pressure Probe Offset bar 0.0 -9.9 +9.9D.C.: Expansion Board No Temperature Probe Offset °C 0.0 -9.9 +9.9Alarm By ID2 No Low SH s 120 0 600Alarm By ID4 No High Suction Temp. s 0 0 600Alarm By ID6 No LOP Failure s 0 0 600ALARMS RESET MODE MOP Failure s 0 0 600High Room Temp. Auto Press. Probe Failure after comp. ON s 20 0 99Low Room Temp. Auto Press. Probe Failure at norm. work s 10 0 99High Room Humidity Auto Manual open Step n° 265 0 2625Low Room Humidity Auto Closing Backsteps n° 5 0 100High Water Temp. (C1/C2) Auto Superheat set °C 6.0 2.0 40.0Loss of Air Flow Man. Superheat set Auto °C 6.0 - -High Air Flow Man. Dead Zone °C 0.0 0 99Low Evap.Pressure Auto Dead Zone Auto °C 0.0 - -EXV Valve Failure Auto Prop. Gaing. 3.0 0 999External Sensors Man. Prop. Gaing. Auto 2.6 - -Loss of Water Flow Man. Integral Time s 30 0 999Humidifier Failure Man. Integral Time Auto s 35 - -Smoke-Fire Man. Derivat. Time s 1.5 0 999Alarm By ID2 Man. Derivat. Time Auto s 1.5 - -Alarm By ID4 Man. Max Suction Temp. °C 30.0 0 999Alarm By ID6 Man. Max Suction Temp. Auto °C 20.0 - -High Delivery Temp. Auto Circ/EEV Ratio. % 50 0 100Low Air Pressure Auto Low Superheat protection limit °C 0.5 -0.4 21.0AFPS: Expansion Board Auto Low Superheat protection limit Auto °C 2.0 - -High Wat.T.to Deh. (C1/C2) Auto Low Superheat protection Integral s 15.0 0 300Dual Coil: Exp.Board. Auto Low Superheat protec. Integ. Time s 0.8 - -

MOP Protection Start-up delay s 30 0 600MOP Protection Start-up delay Auto s 30 - -MOP Protection Integral Time s 3.5 0 999MOP Protection Integral Time Auto s 2.5 - -


CONFIGURATION NUMERICALS PARMETERS


SUPERVISION LOP Protection Integral Time s 15.0 0 600Serial Address 01 LOP Protection Integral Time Auto s 1.5 - -Serial Speed (1200-19200) 1200 Dehumid. SH Set °C 20.0 2.0 40.0Protocol Std Dehumid. LOP limit °C 2.0 -50.0 70.0TWIN-COOL CALIBRATIONEnabled CW workingAlso On DX Alarm YesOnly By ID Contact NoOnly By Serial NoCOOLING WATER CALIBRATIONSensor of regulation RoomT.

Valve Off of the alarm High water Temp. YesEnabled Change Set Chiller of Dehumi. NoEXV VALVEValve type E2VRefrigerant Type R410A

Low SH Protection YesMOP Protection YesLOP Protection YesManual open Step No

LOW PRESSURE SETTINGS WITH REFRIGERANT TYPER410A MIN MAX

Transitory limit bar 0.5 0.1 5.0Normal limit bar 4.6 0.9 5.0Alarm differential bar 2.0 0.1 5.0Alarm delay after compr. ON s 180 30 240Alarm delay normal working s 06 02 10LOW PRESSURE TRANSDUCER RANGERange Begin: bar -0.4 -9.9 99.9Range Ending: bar 34.3 0.0 99.9


Ambient Temperature Regulation DiagramsCW Models

DX Models


TC Models

ES Models


Ambient Humidity Regulation Diagram



Local Network

Overview• Several air conditioners installed in the same room connected in parallel in the same system can

be managed by connecting them to a local network. • The number of connected units depends on the program managing the network, stored in the Flash

Eprom memory.• Units in a network can be connected at a max. of 500 meters (1640 ft).• All the units connected to the network must have the same program version on the flash memory

on the board.• A terminal can be configured as “private” or “shared”:

– Private terminal shows the status of the single unit connected to it by a telephone cable.– Shared terminal shows the status of all the units connected to the network.

• Each board can “talk” to 3 terminals at the most; there are usually no more than two in normal operating conditions: one installed in the unit and one possibly in a remote location.

• To communicate on the local network, the units must be “configured” so that each of them can convey the information necessary to operate properly. To achieve this, the separate units must first be numbered progressively (1,2,3,...10) and then the various terminals and LAN boards correctly addressed to them. The electrical connections must also be made, step by step, as described in the following section.

Note: Alarm signals always have priority over the terminal, even if the parameters of another unit are being viewed when the alarm is triggered.

Common Network ConnectionsUp to 10 units connected to the network with a single terminal

In this configuration, should power fail in the first unit, the terminal would close down. It would therefore not be possible to read any information regarding the units in the network. However, the other units in the network would continue to operate normally.

Up to 10 units each with its own terminal

Up to 10 units with a single shared remote terminal


pCO Boards ConnectionsIn the figure below, a simple parallel connection is shown for more than one pCO boards of the pLAN network, using a shielded cable with two twisted pairs and a shield. The cable is connected to all of the boards through the J11 terminal respecting the indicated polarity.

Warning: Network polarity must be respected: the RX/TX+ of one board must be connected to the RX/TX+ of the other boards; the same applies to RX/TX- and the GND.

The shield should be connected to the ground on the first unit at a metal point using a screw and a washer and the length of the screen should be as short as possible.

Board Terminal Cable ConnectionGND First couple (both wires)Rx+ / Tx+ Second coupleRx- / Tx- Second couple


Remote Terminal Connections

Important warnings

Electrical connections must be carried out when the unit is switched off and unplugged. The network can be configured differently depending on the maximum distance of the board and remote terminal connections; it may be necessary to use a ‘T’ shunt TCONN6J (as shown below) to connect the remote terminal to the main board.

If both of the pin-strip jumpers are between 2 and 3, the passage of the current is interrupted between the connectors that are separated by a dashed line. If power is needed to be supplied to all of the connectors, both of the jumpers must be between 1 and 2.

The 0 terminal is the support terminal, which can be used to connect the screen to the earth of the shielded cable; the “T” derivative may however be connected to a metallic part of the unit, already connected to the earth.

Cable AWG24 3x2Terminal Cable operation Connections0 Earth (screen) shielded1 + VRL (≈ 30 Vcc) 1° twin A2 Gnd 2° twin A3 Rx/Tx- 3° twin A4 Rx/Tx+ 3° twin B5 Gnd 2° twin B6 + VRL (≈ 30 Vcc) 1° twin B


Maximum distances between the terminal and the board

For local terminals the connection with the base board is already made with a 3 pair cable with a 6 way telephone connector. The length of this cable should not be longer than 3 meters.

The remote terminals should be connected to the base board with a telephone cable such as that which has been described in point 1 for a distance of up to 50 meters. For connections of up to 6 meters the cable can be supplied, on request, by Schneider Electric.

For distances up to a maximum of 200 meters, a screened cable must be used (a twisted pair cable with a shield AWG24, resistance < 80ohm/M). The cable can be a three or two twisted pair depending on if it has to transfer power to the terminals.

LAN and Supervision ConnectionFor connection to both LAN and supervision networks, it is advisable to use a cable that has the following specifications:

• Multi-coupled cables with internal flexible conductors made from tin plated copper (AWG 22, insulated with polypropylene, singularly coupled, screened with aluminium/polyester tape + continuity wire in tin plated copper (AWG 24/7) connected on a common axis to reduce the diameter and protected by an external sheath in PVC.

Technical features

Cable length Codem 1.5 Meco 110X1Am 3.0 Meco 130X1Am 6.0 Meco 140X1A

ArticleØ

External om.

Conduct. resist. max.

Impedence Capacity (pF/m) Operatingvoltage

Operating temperature

(mm) (ohm/km) (ohm) C1 C2 (V) (°C)Y08723

2x2xAWG22/74.50 54.8 50 108 198 300 -10/+60


Remote Terminal from the Board ConnectionIn this configuration example, it is necessary to:

• Use the two TCONN6J 'T' joints (one installed on the unit and one near the remote terminal).• Use a three pair screened cable for two, so that the remote terminal is also supplied by the board of

unit 1 to which it is connected by the TCONN6J.• Place the ferrite near the terminal in order to reduce the possibility of electromagnetic

disturbances.


Terminal and pCO Board Addressing the Local Network

Before carrying out the configuration of the addresses, it is advised that the LAN connection between the boards should be checked in addition to the connection with the remote (or shared terminal) and the electric supply connections of the unit. It is possible to configure the address of the terminal only after having connected it to the power supply by using the RJ11 telephone connector. To enter in configuration mode press the UP, DOWN and ENTER buttons at the same time for at least 5 seconds (these buttons are present on all models); the screen shown below will be displayed with a flashing cursor in the left hand top corner:

• To modify the address of the terminal (display address settings), press the ENTER button once and the cursor will move to the address field (nn).

• By using the UP and DOWN buttons, select the desired value and press the ENTER button. If the selected value is different from that previously used, the screen below will appear and the new value will be recorded in the permanent memory of the display.

If “0” is entered as a value in the nn field, the terminal will communicate with the pCO board using the “point-point” protocol (not pLAN) and the field XX will disappear since it has no meaning.

Assigning the list of private and shared terminals (pCO)

If it is necessary to modify the list of terminals associate to each single pCO board, perform the following:

1. Enter in the configuration mode using the UP, DOWN and ENTER buttons as described in the previous section.

2. Press the ENTER button until the cursor is positioned in the XX field (I/O board address). 3. Use the UP and DOWN buttons to choose the address of the desired pCO board.

The values that can be selected will be only those of the pCO boards which are effectively on line. If the pLAN network is not working correctly, or if there are no pCO boards connected, it will not be possible to modify the field and only “—” will be shown.

Pressing the button again will display the sequence of screens.

The ENTER button moves the cursor from one field to another and the UP and DOWN buttons change the value of the chosen field.

The Pxx field: This shows the address of the selected board; in the example in the figure below, P01 has been selected. To exit from the configuration procedure and record the data, select the “OK?” field and set it to YES and then press the ENTER button.


The fields in the “Adr” column represent the addresses of the terminals associated with the pCO board, address 11 for the local terminal and 32 for the shared terminal, while the column Priv/Shared indicates the type of terminal.

Warning: The terminals of the UG40 line cannot be configured as “Sp” (shared printer) as they do not have a printer output.

Note: If the terminal remains inactive for more than 30 seconds (no button has been pressed) it exits automatically from the configuration procedure without recording any eventual changes.

Assigning the list of private and shared terminals


pCO board LAN addressThe pCO board LAN address is selected by:

1. Disconnect the power supply to the pCO board.2. Disconnect the J11 terminal clamps (Rx/Tx-, Rx/Tx+, GND).3. Connect a user terminal with the address = 0 to the board of unit 1.4. Reconnect the power supply and press the ALARM and UP buttons at the same time until the

following screen appears:

5. Press the ENTER button to accept the value of the address of the proposed board on the display or the UP and DOWN buttons to modify it: set the "pLAN address: 1" on unit 1

Note: If a button is not pressed within 15 seconds the screen will disappear from the display and it will be necessary to repeat the procedure described in step 1).

6. Press the ENTER button.7. Disconnect the power supply8. Repeat the procedure in steps 1 through 6 for the other units in the network.

9. Reposition the J11 terminal clamps (Rx/Tx-, Rx/Tx+, GND) on the board.

Unit address table

Unit Address1 12 23 34 45 56 67 78 89 910 10


Terminal and pCO board addresses table

In the following figure, a network of 4 units, each with its own local user terminal and a shared 32 remote user terminal displaying the information of unit 1. To move from showing the display of unit 1 to that of unit 2, press the ESCAPE and DOWN buttons at the same time and in succession for the other units.

Terminal Address pCO Board Address Terminal Address pCO Board Address11 1 16 612 2 17 713 3 18 814 4 19 915 5 20 10

Terminal Address pCO Board Address32 All addresses


LAN Parameter ConfigurationAfter having carried out the configuration of the remote and shared user terminals, the operating parameters of the LAN network must be set. This must only be carried out on the unit with the address LAN1, because the information will automatically be passed on to the other units which are connected.

The parameters that need to be set are inside the connected units screen; some of the settings that need to be carried out are described below:

1. Set the number of units connected to the LAN network.2. Activate the automatic exchange of the unit in stand-by.3. Set the cycle time to carry out the rotation of the units; if the hour is

set at 000, a simple test will be carried out putting the units in rotation with an interval of 2 minutes.

4. Set the number of units in stand-by (max. 2).5. If the last line is set to “Yes,” it enables the stand-by unit to be switched on in the event of an

alarm. All of these settings are automatically passed on to the other connected units.The screen shown here is shown only if the local network has been configured, allowing management of the unit operation with the average temperature value measured from the active units connected in the local network or with the local value measured by the sensor present inside the unit.

• Method Local Value: Control of the unit is entrusted to the temperature values read by the sensor present on the air conditioner

• Method: Average Value: Control of the unit is entrusted to the average temperature read by the sensor present on the active units connected in the local network (if the difference between the average value and the sensor reading itself is more than the “Average/Loc.Diff.” value, the control will automatically move from “Average” to “Local”)

The “Exclude From Rotation” parameter enables excluding the unit from the rotation time management by working in Stand-alone mode. If required, this function must be enabled for individual unit. This setting is not passed on to the other units; it needs to be set individually on each unit.

Air pressure control configuration screen

If a series of units are connected in the LAN, the fan speed can be modulated based on a local probe reading or alternately by calculating the average reading of all the probes connected and configured for each active unit. This setting must be made in the LAN setting screens for each individual unit.

or


Air press. control:

• Local value: Fan speed is modulated based on the pressure value read by the probe installed to the unit only

• Mean value: Fan speed is modulated based on the mean pressure value read by the probes on the units that are activated and connected to the local network


Displaying the Network from the TerminalFrom any terminal in the network, the screen << NetSTAT >> will appear when the UP, DOWN and ENTER buttons are pressed at the same time for at least 10 seconds. The NetSTAT screen indicates all of the pCO boards with a LAN address and all of the terminals present in the network, including the remote shared terminal, and its relative addresses.

In the example, the result is that the network is composed of 3 LAN boards with the address 1,2,3 and of 4 user terminals with the address 11,12,13 and 32.


Maintenance

Safety During Maintenance WorkAll work must be carried out by professionals that have been qualified and trained on Schneider Electric cooling products.

Warning: Disconnect the unit from the power supply before starting any maintenance work.

Quarterly ChecksPerform the following checks every three months:

• Check the power supply.• Check the alarm status.• Check the working temperatures.• Check the correct operation of the local/remote controls.• Check the air filters, replace them if necessary.• Check the efficiency of the condensate drain.• Verify that the steam cylinder is clean, replace it if necessary.

Semi-Annual Checks Perform the following checks every six months:

• Check the cooling coil and clean if necessary.• Check the operation of the humidifier.


Annual ChecksPerform the following checks every twelve months:

• Check for corrosion on hardware and coils.• Check the hinges and gaskets.• Check the cables and wiring.• Tighten the terminal blocks.• Check the safety device settings (pressure switches and protection devices) and reset if necessary.• Check the fittings, operation and amps of the fan(s) motor.• Check the regulation devices setting and reset if necessary.• Check the chilled water circuit seal (reseal if necessary) and tighten the unit couplings.• Check the water regulation valve(s) setting and reset if necessary.

Warning: There are moving parts. Do not operate unit with panels removed.

Warning: Risk of electric shock. Disconnect power before servicing unit.

Warning: Emptying the unit is recommended in the event of prolonged inactivity.


FiltersReplacing the filters

To replace a filter, open the front panels.

For models with rear air intake, use the following figure:

For models with high intake (MOD. TDCV: 3400, 4000, 4300), use the following procedure:

1. Remove the filter blocking supports.2. Reposition the new filters in the unit, checking the direction of the air flow (noted on the filters).

For other models, use the following procedure:

1. Remove the filters.


2. Position the new filters in the unit, checking the direction of the air flow (noted on the filters).

Actuator and Chilled Water ValveIf necessary (in the event of a fault in the actuator or the control system), manually move the valve. There is a manual operation handle on the actuator. When it is lowered, the motor stops and then the actuator can be operated manually if the handle is turned.

The chilled water actuator is the same model as the hot water actuator.

Actuator and Hot Water ValveTo manually move the valve turn the control knob clockwise to open and counter clockwise to close.

Alternatively, it is possible to remove the actuator from the valve body and move the valve stem itself.


HumidifierThe only maintenance required is periodic inspection and cleaning of the steam humidifier components. This should be done at least once a year.

Note: Periodically inspect the feed and drain connections in order to guarantee trouble-free humidifier operation. Limescale deposits can affect humidifier performance. Periodically

check for limescale buildup and replace humidifier cylinder when necessary.

The frequency of this operation depends on the supply water: the higher the content of salts or impurities, the more frequently the cylinder will need cleaning. Before removing the cylinder for replacement or cleaning it is necessary to completely drain all of the water from the boiler.

To connect the CPY user terminal

1. Connect the CPY user terminal by following the substeps:a. Turn off the unit, then power it down.b. Using a #2 Phillips screw driver, remove the Controller Board Access panel.

c. Power up the unit and connect the CPY user terminal to the Humidifier Control Board port.2. Press UP and DOWN together for 2 seconds (the message ‘dr’ on the display alternating with

‘tot’ indicates the function has been activated).3. Press UP and DOWN again for 2 seconds to stop the drain cycle. The drain cycle in any case ends

automatically.If the CPY User terminal is not available, connect a jumper wire between terminals M11.3 and M8.1 of CPY board. Remove the jumper wire to stop the drain cycle.

DANGERHAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Before working on the equipment, turn off all power supplying the equipment and disconnect the power cable. Only trained personnel familiar with the construction and operation of the equipment and the electrical hazards involved may make repairs to the equipment.

Failure to follow these instructions will result in death or serious injury.

WARNINGPRESENCE OF SPINNING FAN BLADES

Some units contain fans above the humidifier controller board.

Failure to turn off unit before powering it down may result in damage to the system or injure the user.


To access the cylinder:

1. Completely drain the water contained in the cylinder.2. Turn the unit off and open the main power disconnecting switch.

To turn the unit off, see “Switching Unit On and Off” on page 10.3. Open and remove the cover.4. Remove the steam hose from the cylinder.5. Disconnect the electrical connections from the top of the cylinder.6. Release the cylinder from the fastening device and lift it up to remove it. Electrical heaters

.

Electrical HeatersReplacing the electrical heaters

Electrical Hazard: Perform Lockout/Tagout procedures on the cooling unit before servicing. Failure to remove power before servicing this equipment could result in serious injury or death.

The total power of the electrical heaters is divided into different elements. The color of the wires on each element has the following meaning:

• black wire: low power current carrying capacity• white wire: high power current carrying capacity• red wire: standard

The wires of each element are connected to the CR1 and CR2 connectors on the electrical panel in such a way as to balance the load across the phases and create three stages of heating (refer to the electric diagram on the side of the unit).

Electrical Heaters Safety Thermostats

Number of thermostats 2

Fixed set Set 482°F, 250°C


CW TroubleshootingTroubleshooting is made easier by the indications on the control panel display.

If necessary, call Technical Support describing the nature of the fault and its possible cause displayed on the control panel.

Initial Startup

Temperature Control

Problem Possible Cause Check/Corrective Action

UNIT DOES NOT START

A) No power supply to the electrical panel

Check that the power is on and the unit main switch on the electrical panel is closed.

B) No power to the auxiliary circuits

1) Check that the M automatic circuit breaker on the AUX circuit is set.

2) Check the fuse on the main board.

C) Control panel does not start the unit

Check that the control panel connectors are correctly located in their sockets.


ROOMTEMPERATURE IS TOO HIGH

A) Parameter settings on the control panel are not correct See “Adjusting Parameters” on page 11.

B) Air flow is low or absent See the table “Fans” on page 77.

C) Temperature sensor reads higher than expected

Check the electrical connections and the control configuration.

D) Thermal load is higher than the expected Check the room’s thermal load.

E) Chilled Water valve is not working

Check the electrical connections of the actuator valve.

Open the valve by means of the manual control knob.

Check the chilled water supply and check that the shut-off valves are open.

F) Insufficient chilled water flow Check the chilled water function.

ROOM TEMPERATURE IS TOO LOW


C) Hot water coil is not working

1) Check the hot water capacity and temperature.

2) Check the function of the regulation valve.

E) Chilled water valve is blocked open

Close the valves using the manual control knob and replace the actuator.


Electric Heaters

Humidity Control


ELECTRIC HEATER SAFETY THERMOSTAT CLOSES OR OPENS

A) Insufficient air flow See the table “Fans” on page 77.

B) Thermostat connection wire is interrupted

Check the connection between the safety thermostat and the control system.

C) Thermostat is faulty Replace the thermostat.


ROOM HUMIDITY IS TOO HIGH


B) Latent load is higher than expected

Check the latent load, fresh air conditions and volume; external air infiltration.

C) Dehumidification valve not shutting

Check that the feeding solenoid valve of the dehumidification circuit is working properly.

D) Control system not working Check that the panel and/or the probe are working properly.

E) Chilled water is not sufficiently cold for the dehumidification function (in Energy Saving and Twin-Cool units)

Lower the chilled water temperature until condensate is present on the surface of the coil.

ROOM HUMIDITY IS TOO LOW

A) Parameter settings on the control panel are not correct Check the room humidity settings.

B) Latent load is lower than expected

Check the latent load, fresh air conditions and volume; external air infiltration.

C) Humidifier does not work

1) Check the water supply pressure.

2) Check the function of the manual control system and of the steam production group.

D) Control system does not work Check that the control panel and/or sensors work properly.


FansProblem Possible Cause Check/corrective Action

ABSENT OR LOW AIR FLOW

A) No power to the fans Check the power supply to the fans.

B) Air filters are clogged (clogged filter alarm enabled)

1) Shake the dust out of the cartridge and clean with a vacuum cleaner. Replace the filter if it is completely blocked.

2) Check the correct setting of the clogged filter pressure switch.

C) Fans are rotating in the wrong direction Reverse input phases and check if fans are rotating in the correct direction.

D) Air flow is obstructed Check the airflow distribution.

E) Fan thermal protection closes or opensCheck the resistance of the fan motor windings. Re-set then to measure the voltage and absorption.

F) Fan speed regulation not set correctly See “Software settings” on page 31.

G) Excessive external static pressure in the air distribution system

Check the dimensioning of the air distribution system, as well as, all its parts (ducts, suspended ceilings, floor plenum and air grills).


DX TroubleshootingTroubleshooting is made easier by the indications on the control panel display.

If necessary, call Technical Support describing the nature of the fault and its possible cause displayed on the control panel.

Initial Startup

Problem Possible Cause Check/corrective Action

THE UNIT DOESNOT START

No power supply to the unit’s electrical panel.

Check that the power is on and the unit main switch on the electrical panel is closed.

No power to the auxiliary circuits.1. Check that the IM automatic circuit

breaker on the AUX circuit is set.2. Check the fuse on the main board.

The control panel does not start the unit.

Check that the control panel connectors are correctly located in their sockets.


Temperature Control


ROOM TEMPERATURE TOO HIGH

The parameter settings on the control panel are not correct. See control panel instruction manual

The air flow is low or absent. See “ABSENT OR LOW AIR FLOW” on page 80.

The temperature sensor is not working. Check the electrical connections and the control configuration.

The thermal load is higher than expected. Check the room thermal load.

The three-way valve is not working.

Check the electrical connections of the servomotor valve.

Open the valve by means of the manual control knob.

Check the chilled water supply; check that the shut-off valves are open.

There is an insufficient chilled water flow. Check the chilled water function.

The chilled water temperature is too high. Check the chilled water function.

The compressor(s) not working despite control call

See “THE COMPRESSOR(S) DOESN'T/DON'T WORK” on page 83.

ROOM TEMPERATURE TOO LOW

The parameter settings on the control are not correct See the microprocessor control manual.

The hot water coil is not working.

1. Check the hot water capacity and temperature.

2. Check the function of the regulation valve (see valve and servomotor).

The hot gas coil is not working during dehumidification with re-heat.

1. Check the hot gas valve function.2. Check the function of the compressor

serving the re-heat. See “THE COMPRESSOR(S) DOESN'T/DON'T WORK” on page 83.

The three way valve of the chilled water circuit is blocked open.

Close the valve using the manual control knob and replace the servomotor.


Humidity Control

Fans


ROOM HUMIDITY TOO HIGH

The parameter settings on the control panel are not correct. See control panel instruction manual.

The latent load is higher then expected. Check the latent load, fresh air conditions and volume; external air infiltration.

The compressor does not function during dehumidification.


The chilled water is not sufficiently cold for the dehumidification function (in energy saving and twin cool units).

Lower the chilled water temperature until condensate is present on the surface of the coil.

ROOM HUMIDITY TOO LOW

The parameter settings on the control panel are not correct.

Check the room humidity settings (see control panel instruction manual).

The latent load is lower than expected. Check the quantity of latent heat.

The humidifier doesn’t work.

1. Check the water supply pressure.2. Check the function of the manual control

system and of the steam production group (see panel instruction manual).

The control system does not work.See the control panel instruction manual; check that the control panel and/or sensors work properly.


ABSENT OR LOW AIR FLOW

There is no power to the fans. Check the power supply to the fans.

The air filters are clogged (dirty filter alarm enabled).

1. Shake the dust out of the cartridge and clean with a vacuum cleaner. Replace the filter if it is completely blocked.

2. Check the correct setting of the dirty filter pressure switch PFS.

The air flow is obstructed. Check that the air flow is not obstructed, not even partially.

The fans’ thermal protection intervenes.

Check the resistance of the fan motor windings. Reset then measure the voltage and absorption.

(In TD*R, TU*R units with backward curved blade fans). The power supply to the fans is insufficient.

Change the power supply voltage to the fans. See “Software settings” on page 31.

The air distribution output pressure is too high.

Check the air pressure distribution (ducts, ceiling or floor plenum, grilles).


CompressorsProblem Possible Cause Check/corrective Action

HIGH COMPRESSOR DISCHARGE PRESSURE

Loss of control voltage to input contact

Check voltage and to input and high head pressure switch

There is non-condensable air or gas in the refrigerant circuit, with bubbles in the flow sight glass; excessive sub-cooling.

Evacuate the refrigerant circuit and recharge.

The air flow to the remote heat exchanger is insufficient or too warm.

1. Check the fan operation and rotation direction in the remote heat exchanger.

2. Check to see if the exchanger is dirty and if necessary remove any obstructing material (leaves, paper, seeds, dust, etc.) with a blast of compressed air or a brush;

3. In the external unit check for obstructions in the air flow and in the recirculation of the cool-ing air.

4. Check that the temperature of the cooling air is within the planned limits.

The water flow to the condenser is insufficient or too warm.

1. Check the condenser water flow, pressure and temperature in the closed circuit water sys-tem.

2. Check the setting and function of the pressostatic regulation valve.Check the setting and function of the pressostatic reg-ulation valve.

There is too much refrigerant in the circuit; the condenser is partially flooded. The refrigerant subcooling is too high at the condenser outlet.

Remove some refrigerant from the circuit.

The discharge valves are partially closed. Check the opening of the valves.

AP HIGH PRESSURESWITCHINTERVENES (high compressordischarge pressure)

The condensing pressure control system is not functioning efficiently.

1. Check the fan function of the condenser and of the relative protection; re-set or replace the faulty fans.

2. Check the setting and function of the fan speed regulator of the remote condenser.

The system discharge pressure is too high.



LOW COMPRESSOR DISCHARGE PRESSURE

The condensing pressure control system is not functioning efficiently (see control panel manual).

Check the setting and function of the condenser fan pressure switch or speed regulator.

The water flow to the condenser is too high or too cold.

1. Check the condenser water flow and temperature

2. Check the setting and function of the pressure regulating valve (if fitted).

3. Fit a pressure regulating valve to control the water pressure according to the condensing pressure.

The suction pressure is too low.

See “LOW COMPRESSOR SUCTION PRESSURE (and possible freezing of the coil)” on page 82.

HIGH COMPRESSOR SUCTION PRESSURE

The thermal load is too high.

Check the room’s thermal load; check in case of over dehumidification, check the air flow and conditions of external air, check the external air infiltration.

The discharge pressure is too high.See “HIGH COMPRESSOR SUCTION PRESSURE” on page 82.

There is an overcharge of refrigerant in the circuit. Remove some refrigerant from the circuit.

Remove some refrigerant from the circuit.

There is a return of liquid refrigerant to the compressor intake

Check that the super heat setting of the thermostatic valve is correct.

LOW COMPRESSOR SUCTION PRESSURE(and possible freezingof the coil)

The room temperature is too low. See “ROOM TEMPERATURE TOO LOW” on page 79.

The air flow is too low or is absent. See “ABSENT OR LOW AIR FLOW” on page 80.

The liquid line solenoid valve is not completely open. Check the valve opening.

The refrigerant filter is obstructed. Check the refrigerant filter.

The thermostatic valve is incorrectly calibrated or defective.

Check the super heat setting of the thermostatic valve; check that the sensor bulb has not lost its charge and is well positioned, fixed and insulated.

There is an insufficient refrigerant charge.

Check the sub-cooling of the refrigerant liquid at the condenser outlet; check to see if there are any leaks and re-charge the unit.



THE COMPRESSOR(S) DOESN'T/DON'T WORK

The short circuit protection has intervened.

Re-set the automatic switch and check the cause of the short circuit.Before re-starting the compressor, check the resistance and continuity of the compressor motor windings.

The contactor is not working. Check the contacts and the contactor coil.

THE COMPRESSOR'S INTERNAL PROTECTION INTERVENES

A loss or drop in of phase voltage is present.

Check the resistance of the compressor motor windings. After re-setting, measure the voltage and current absorption of the three phases.

The motor is overloaded.The motor is overloaded.

Check that the unit pressure operates within the planned limits.

The power supply voltage is too high or too low.

Check that the voltage iswithin -10% and +10% of the nominal value.

The rotor is blocked or seized. Replace the compressor.



4/2012990-4480A-001

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