Carrier PRO-DIALOG 30GK User Manual

30GK Series PRO-DIALOG Control

Air-Cooled Liquid Chillers 50 Hz

Installation, operation and maintenance instructions

TABLE OF CONTENTS

1 - SAFETY CONSIDERATIONS..................................................................................................................................................4

1.1 - General .................................................................................................................................................................................4

1.2 - Avoiding electrocution.........................................................................................................................................................4

2 - GENERAL DESCRIPTION ......................................................................................................................................................5

2.1 - General .................................................................................................................................................................................5

2.2 - Abbreviations used ...............................................................................................................................................................5

3 - HARDWARE DESCRIPTION....................................................................................................... ...........................................6

3.1 - General .................................................................................................................................................................................6

3.2 - Electronic boards ..................................................................................................................................................................6

3.2.1 - The basic board ............................................................................................................................................................6

3.2.2 - Slave boards .................................................................................................................................................................6

3.2.3 - The user interface.........................................................................................................................................................7

3.2.4 - Connections between boards .......................................................................................................................................7

3.2.5 - Slave board addresses ..................................................................................................................................................7

3.2.6 - Power supply to the boards ..........................................................................................................................................7

3.2.7 - Light emitting diodes on boards ..................................................................................................................................7

3.3 - The controls ..........................................................................................................................................................................7

3.3.1 - Electronic expansion valve (EXV)..............................................................................................................................7

3.3.2 - The head pressure controls ..........................................................................................................................................7

3.3.3 - The evaporator pumps .................................................................................................................................................8

3.3.4 - The condenser pump....................................................................................................................................................8

3.3.5 - Pressure sensors ...........................................................................................................................................................8

3.3.6 - Thermistors ..................................................................................................................................................................8

3.4 - User connections ..................................................................................................................................................................9

4 - SETTING UP PRO-DIALOG PLUS CONTROL .................................................................................................................10

4.1 - Local interface general features..........................................................................................................................................10

4.2 - Unit start/stop control .........................................................................................................................................................11

4.2.1 - Description.................................................................................................................................................................11

4.2.2 - Stopping the unit in local mode ................................................................................................................................. 11

4.2.3 - Starting unit and selecting an operating type.............................................................................................................11

4.3 - Menus .................................................................................................................................................................................12

4.3.1 - Selecting a menu ........................................................................................................................................................12

4.3.2 - Selecting a menu item................................................................................................................................................12

4.3.3 - Modifying the value of a parameter/access to a sub-menu........................................................................................12

4.3.4 - Expand display...........................................................................................................................................................12

4.4 - General menu structure.......................................................................................................................................................13

4.5 - Menu tree structure.............................................................................................................................................................14

4.5.1 - Description of the Information menu.........................................................................................................................15

4.5.2 - Description of the Temperatures menu......................................................................................................................16

4.5.3 - Description of the Pressures menu.............................................................................................................................16

4.5.4 - Description of the Setpoints menu.............................................................................................................................17

4.5.5 - Description of the Inputs menu..................................................................................................................................18

4.5.6 - Description of the Outputs/Tests menu .....................................................................................................................18

4.5.7 - Description of the Configuration menu .....................................................................................................................20

4.5.8 - Description of the Alarms menu ................................................................................................................................25

4.5.9 - Description of the Alarms History menu ...................................................................................................................25

4.5.10 - Runtime menu description .......................................................................................................................................26

The cover photograph is solely for illustration, and forms no part of any offer for sale or any sale contract. The manufacturer reserves the right to change the design at any time without notice.

5 - PRO-DIALOG PLUS CONTROL OPERATION .................................................................................................................27

5.1 - Start/stop control ................................................................................................................................................................27

5.2 - Heating/cooling selection ...................................................................................................................................................27

5.3 - Evaporator water pump control ..........................................................................................................................................28

5.4 - Condenser water pump control...........................................................................................................................................28

5.5 - Control interlock contact ....................................................................................................................................................28

5.6 - Evaporator heater control ...................................................................................................................................................28

5.7 - Control point......................................................................................................................................................................28

5.7.1 - Active setpoint ...........................................................................................................................................................28

5.7.2 - Reset...........................................................................................................................................................................28

5.8 - Demand limit ......................................................................................................................................................................29

5.9 - Capacity control ................................................................................................................................................................29

5.10 - Determining the lead circuit............................................................................................................................................29

5.11 - Circuit loading sequence..................................................................................................................................................29

5.12 - Slave compressor start-up sequence ................................................................................................................................30

5.13 - Controlling the EXV ........................................................................................................................................................30

5.14 - Head pressure control on air-cooled units .......................................................................................................................30

5.15 - Head pressure control on water-cooled units...................................................................................................................30

5.16 - Active setpoint selection ..................................................................................................................................................30

5.17 - High pressure load shedding function..............................................................................................................................31

5.18 - Pumping down..................................................................................................................................................................31

5.19 - Master/slave assembly .....................................................................................................................................................31

5.20 - Controlling Pro-Dialog Plus units with a System Manager.............................................................................................31

5.21 - Optional heat reclaim module ..........................................................................................................................................32

6 - DIAGNOSTICS - TROUBLESHOOTING ............................................................................................................................32

6.1 - General ...............................................................................................................................................................................32

6.2 - Displaying alarms ...............................................................................................................................................................32

6.3 - Resetting alarms .................................................................................................................................................................32

6.4 - Alarm codes........................................................................................................................................................................33

1 - SAFETY CONSIDERATIONS

1.1 - General

Installation, start-up and servicing of equipment can be hazardous if factors particular to the installation are not considered: operating pressures, electrical components, voltages and the installation site itself (elevated plinths, rooftops and built-up structures).

IMPORTANT: Risk of electrocution: Even when the main power isolator or circuit breaker is off, it is still possible for certain components such as crankcase heaters and trace heaters to be energised, since they are connected to a separate power source.

Even when the unit is switched off, the power circuit remains energised, as long as the unit or circuit disconnect is not open. Refer to the wiring diagram for details.

Only highly trained and qualified installation engineers and technicians, who are fully trained on the product, are authorised to install and start up this equipment.

During all servicing operations, it is important to read, understand and follow all the recommendations and instructions given in the installation and service instructions for the product, including the tags and labels affixed to the equipment, components and any parts supplied separately, and to comply with all other relevant safety regulations.

• Apply all safety codes and practices.

• Wear safety glasses and gloves.

• Use the proper tools to move heavy objects. Move units carefully and set them down gently.

1.2 - Avoiding electrocution

Only personnel qualified in accordance with the recommendations of the IEC (International Electrotechnical Commission) may be permitted access to electrical components. It is particularly recommended that all sources of electricity to the unit be shut off before any work is begun. Shut off the main power supply at the main circuit breaker or isolator.

Attach appropriate safety labels.

Risk of burns: Electrical currents cause components to get hot either temporarily or permanently. Handle power cables, electrical cables and conduits, terminal box covers and motor frames with very great care.

IMPORTANT: This equipment uses and emits electromagnetic signals. The tests carried out on this product have shown that it complies with all applicable codes regarding electromagnetic compatibility.

IMPORTANT : If the boards need to be handled wear antistatic gloves to avoid exposing the electronic components to a destructive voltage. Only unpack the boards from their antistatic bag when they need to be installed.

2 - GENERAL DESCRIPTION

2.2 - Abbreviations used

2.1 - General

PRO-DIALOG Plus is a system for controlling units which use reciprocating compressors*:

• Single or dual circuit

• Air or water-cooled condensers

• Non-reversible heat pumps

• Split systems

* At present only air-cooled models are available.

PRO-DIALOG Plus controls compressor start-up and demand limits needed to maintain the desired entering or leaving temperature setpoint for water. It automatically sets the position of the electronic expansion valve (if used) to optimise the evaporator charge. It controls operation of the fans (on air-cooled units) or water valves (on water-cooled units) to maintain the correct head pressure in each circuit.

Safety circuits are constantly monitored by PRO-DIALOG Plus to ensure safe operation of the unit. PRO-DIALOG Plus also gives access to a Quick Test program covering all inputs and outputs.

All PRO-DIALOG Plus controls can work in accordance with three independent modes:

• Local mode: the machine is controlled by commands from the user interface.

• Remote mode: the machine is controlled by remote contacts (volt-free contacts, analogue signals).

• CCN mode: the machine is controlled by commands from the Carrier Comfort Network (CCN). In this case a data communication cable is used to connect the unit to the CCN communication bus.

In this manual the circuits are called circuit A and circuit B. The compressors in circuit A are labelled A1, A2, A3 and A4. Those in circuit B are labelled B1, B2, B3 and B4. A1 and B1 are the lead compressors.

The following abbreviations are frequently used: AI - Analogue Input AO - Analogue Output CCn - Operating type: CCN CCN - Carrier Comfort Network.

This is the Carrier communication network DI - Discrete Input DO - Discrete Output EXV - Electronic Expansion Device LED - Light Emitting Diode LOFF - Operating type: Local off L-ON - Operating type: Local operation MASt - Master unit operating type (master/slave assembly) RCPM - Reciprocating Compressor Protection Module rEM - Operating type: by remote control contacts SCT - Saturated disCharge Temperature SIO - Standard Input/Output - internal communication bus

linking the basic board to the slave boards SST - Saturated Suction Temperature

The operating mode must be chosen with the Operating Type selection button described in section 4.2.1.

When the PRO-DIALOG Plus system operates autonomously (Local or Remote mode) it retains all of its own control capabilities but does not offer any of the features of the CCN network.

3 - HARDWARE DESCRIPTION

3.1 - General

Control board

Legend

1 CCN connector 2 Red LED, status of the board 3 Green LED, communication bus SIO 4 Orange LED, communication bus CCN 5 Remote master board customer control connection contacts 6 Remote master board customer control connection signal 7 Remote master board customer report connection contacts 8 Master PD4 basic board 9 CCN/clock board

The control system consists of at least a PD4 basic board, a user interface, a PD4-EXV slave board and, depending on the application, one or more RCPM compressor boards, 4xDO boards or 4xAI-2xAO boards and an NRCP-BASE slave board. Slave boards are connected to the basic board via an internal communication bus (SIO).

The CCN/clock board is connected and screwed to the master basic board. It permits communication with elements of the Carrier Comfort Network via the CCN bus.

The various control components are arranged in modules within the control cabinet:

• Control module: This comprises the basic board, the

user interface, the EXV control board and option boards, as well as the customer’s terminal block.

• Start-up module: This consists of the start-up boards,

compressor protection boards, as well as the compressor circuit breakers and contactors.

• Fan module (air-cooled unit): Consists of one or two

4xDO boards together with the fan circuit breakers and contactors.

3.2 - Electronic boards

3.2.1 - The basic board

It can be used alone or in conjunction with slave boards. It holds the program that controls the machine. It continuously manages the information coming in from the various pressure and temperature sensors, and communicates with the slave boards via the SIO bus. It can also communicate with elements of the Carrier Comfort Network via the CCN bus.

NOTE: After a power cut the unit restarts in the same operating mode as before the power cut.

3.2.2 - Slave boards

• Compressor board RCPM: This board is used to control

a compressor. Up to eight RCPM boards can be connected to the basic board.

• 4xDO board: This board can be used to control fan stages.

• PD4-EXV board: This board can control two EXV valves

and two suction temperature sensors.

• 4xAI-2xAO board: This optional board can be used to

read sensors (oil pressure), or to control variable speed fans (air-cooled units) or the condenser valve (water-cooled units).

• NRCP-BASE board: This optional board is used to control

the inputs and outputs of the heat reclaim option.

Legend

1 Power supply disconnect switch 2 Fan start-up module

Control box

3 Compressor start-up module 4 Control system 5 User interface

3.2.3 - The user interface

The user interface is in two parts:

• The main interface: This gives access to all of the

control parameters for the unit. It consists of a 2-digit primary display block and a secondary 4-digit display block with 10 LEDs and 5 buttons.

• The summary interface: This gives quick access to just

the main control parameters for the unit. It comprises 12 buttons and 16 LEDs, and includes a schematic diagram of the unit.

3.2.4 - Connections between boards

The basic board and slave boards communicate with each other over an internal three-wire RS485 communication bus (SIO bus). These three wires link all the boards in parallel.

Terminals 1, 2 and 3 on connector J9 (A, B, C are connected internally) of the basic board are connected to terminals 1, 2 and 3 of terminal J9 of the NRCP-BASE board, terminal J4 of the PD4-EXV board respectively, except for terminal J3 of the 4xDO and 4xAI-2xAO boards where terminals 2 and 3 are reversed.

Incorrect connection will render the system inoperative.

3.2.5 - Slave board addresses

Every slave board (except the NRCP-BASE board) has a unique address controlled by 8 DIP switches. The switch is disabled when it is in the open position (OPEN or OFF). On RCPM boards SIO address switch is labelled 'ADDR'.

3.2.7 - Light emitting diodes on boards

All boards continuously check and indicate the proper operation of their electronic circuits. A light emitting diode (LED) lights on each board when it is operating properly.

Red LED

• The MAIN red LED flashes at about 2 second intervals to show that the module is working properly.

• Irregular flashing or no flashing is a sign of a defective board.

Green LED

(item SIO on the board)

• This LED flashes continuously to show that the board is communicating correctly over its internal bus.

• If this LED is not flashing, check the wiring of the SIO bus and the address of the board (slave board only). If the basic board is not linked to any slave boards, this LED should not flash.

• If all slave boards indicate a communication fault, check the SIO bus connection on the basic board. If this connection is correct and the fault persists, replace the basic board.

Orange LED - CCN/clock board

• This LED flashes to show that the basic board is communicating via the CCN bus.

NOTE: Any incorrect address will prevent the unit from starting. Turn off the power before amending the address of any auxiliary board.

Board addresses

Board Address switch

87654321

PD4-EXV 0 0 011101 4xDO Fan board # 1 0 0 100111 4xDO Fan board # 2 0 0 101011 4xAI-2xAO board # 1 0 0 101111 4xAI-2xAO board # 2 0 1 111000 RCPM # 1 (compressor A1) 1 1 010100 RCPM # 2 (compressor A2) 1 1 011111 RCPM # 2 (compressor A3) 1 1 011001 RCPM # 2 (compressor A4) 1 1 100100 RCPM # 3 (compressor B1) 1 1 101010 RCPM # 4 (compressor B2) 1 1 110101 RCPM # 4 (compressor B3) 1 1 101111 RCPM # 4 (compressor B4) 1 1 110010

3.2.6 - Power supply to the boards

All boards are supplied by a 24 V source, ref erred to earth. In the event of a power supply interrupt, the unit restarts automatically without the need for an external command. However, any faults active when the supply is interrupted are saved and may in certain cases prevent a circuit or unit from restarting.

NOTE: When connecting the power supply for the boards, maintain polarity.

3.3 - The controls

3.3.1 - Electronic expansion valve (EXV)

The EXV is used to adjust the refrigerant flow to changes in the operating conditions of the machine. For this purpose, a series of calibrated orifices are machined into the wall of the refrigerant inlet port. As the refrigerant passes through these orifices, it expands and becomes a bi-phase mixture (liquid and gas).

T o adjust the refriger ant flow to changes in operating conditions, a piston moves constantly up or down to vary the cross-section of the refrigerant path. This piston is driven by an electronically controlled linear stepper motor. The high degree of accuracy with which the piston is positioned ensures that the flow of refrigerant is precisely controlled.

NOTE: The external connector of the EXV must be cleaned and coated with silicone grease (Part No. 397 EE) to keep out condensation and prevent corrosion.

3.3.2 - The head pressure controls

The controller can deal with the following:

• in the case of air-cooled units, for each circuit, fan stages together with, if necessary, a variable speed fan (controlled by an optional 4xAI-2xAO board)

• in the case of water-cooled units, a water valve. This valve is controlled by an optional 4xAI-2xAO board which can deliver a 0-10 V d.c. or 4-20 mA signal, depending on the configuration.

3.3.3 - The evaporator pumps

The controller can regulate one or two evaporator pumps, with automatic changeover between the two pumps.

3.3.4 - The condenser pump

In appropriate cases the controller can regulate a condenser pump (for water-cooled units or air-cooled units with heat reclaim option). This control does not require an additional board.

3.3.5 - Pressure sensors

These are used to measure the following pressures in each circuit:

• Discharge gas pressure (high pressure type)

• Suction pressure (low pressure type)

• Oil pressure (option)

These electronic sensors deliver 0 to 5 V d.c. to the main board or to a 4xAI-2xAO slave board. Two sensor versions are used; one is calibrated for high pressure and the other for low pressure and oil pressure.

Discharge pressure sensors

These are on the high pressure side of the lead compressor in each circuit. They replace the usual discharge gas pressure gauges and can be used to control head pressure or by the high pressure load shedding option.

Oil pressure sensors

If installed, these sensors are used to measure the compressor oil pressure on the oil pressure discharge side. The suction pressure is subtracted from the oil pressure value to arrive at the differential oil pressure.

Suction pressure sensors

They are located in the low-pressure side of the unit on the lead compressor of each circuit. The suction pressure sensor reading is used to control the electronic expansion devices EXV. They permit replacement of the low-pressure switches, low-pressure gauges and possibly of the oil pressure safety switch.

3.3.6 - Thermistors

These all have similar characteristics.

Evaporator entering water temperature sensor

The evaporator entering water temperature sensor is installed in the evaporator wall in the free space at the side of the tube bundle.

Evaporator leaving water temperature sensor

The evaporator leaving water temperature sensor is installed in evaporator leaving water piping: The sensor bulb is directly immersed in the water.

Compressor suction sensor

This is located in the lead compressor of each circuit in the suction gas line situated between the motor and the cylinders above the oil pump.

Condenser entering and leaving water temperature sensors

These are used to control the heating capacity on heat pumps. In cooling only units they have no control function. They are installed in the common condenser entering and leaving line.

Heat reclaim condenser entering/leaving water temperatures

These sensors measure the entering and leaving water temperatures of heat reclaim condensers and are used on air-cooled units equipped with the heat reclaim option. If not, they may be fitted as options. In this case they only have informative character.

Temperature setpoint reset sensor

This is an optional 0-10 V sensor which can be installed remotely from the unit. It is used to reset the cooling and heating setpoint on the unit as a function of either the outdoor air temperature or ambient room temperature. The sensor is not supplied by Carrier, and must be configured by the User Menu.

Outdoor temperature sensor

Mounted on the control box. It is used for start-up, setpoint temperature reset and frost protection control.

Master/slave assembly temperature control

The optional water temperature sensor can be used for master/ slave assembly control.

3.4 - User connections

The connections below are available at the customer’s terminal block. Some of them can only be used in special operating modes. For further details see the sections that describe the functions (section 5) and the configurations (section 4.2.1).

NOTE: The bridge between terminals 32, 63 and 65 on the customer’s terminal block must not be removed.

CONNECTION BLOCK

DESCRIPTION

Alarm relay output, circuit A Alarm relay output, circuit B

User safety loop and chilled water pump interlock

Remote start/stop

Remote cooling setpoint selection

Remote heating/cooling control or

remote heat reclaim control

Demand limit command

0-10 V d.c. setpoint reset or demand limit entry

Connection to CCN

CONNECTOR/CHANNEL

J3 / CH24 J3 / CH25

J4 / CH15a

J4 / CH11

J4 / CH12

J4 / CH13

J4 / CH14

J8 / CH10

J12

TERMINAL

30A - 31A 30B - 31B

34 - 35

32 - 33

65 - 66

63 - 64

73 - 74

71 - 72

1 - 2 - 3

DESCRIPTION

Indicates alarms in circuit A Indicates alarms in circuit B

This contact is mounted in series with the water flow control contact. It can be used for any user safety loop that requires that the unit is shut down, if it is open. The chilled water pump operation auxiliary contact is connected between these two terminals.

The remote start/stop command is only used if the unit is under remote operation control (rEM). See section 4.2.1.

The remote cooling setpoint selection command is only used if the unit is under remote operation control (rEM). See section 4.2.1.

The remote heating/cooling control command is only used if the unit is under remote operation control (rEM). See section 4.2.1.

The command allows selection of the second condensing setpoint or of the heat reclaim mode. It is only used if the unit is under remote operation control (rEM). See section

4.2.1. This contact permits activating the unit demand limit

function. See section 5.8. This contact is active, whate v er the operating type.

This 0-10 V d.c. input is used for setpoint reset or unit demand limit. It is active, whatev er the unit operating type . This 0-10 V signal can be supplied by a user command or a 0-10 V temperature sensor.

A RS-485 bus is used for connection to the CCN. The CCN connector is located on the CCN/clock board (inserted on the PD4 Basic Board)

- Pin 1: signal +

- Pin 2: ground

- Pin 3: signal -

REMARKS

Volt-free contacts 24 V a.c. 48 V d.c. max, 20 V a.c. or V d.c., 3 A max, 80 mA min, external power supply .

Connector: 6 pin WA GO 231-306/026000 pitch 5.08.

24 V a.c., 20 mA Connector: 10 pin WAGO

734-110, pitch 3.5

Connector: 2 pin WAGO 231302/026000 pitch 5.08

Use of a shielded cable (max. length: 1000 m) Shielding: braiding on 95% 100% of the cable surface. Shielding connection at the two cable ends.

AVAILABLE TERMINALS

Description

Condenser water flow switch input

Evaporator 1 and 2 pump operation input

Evaporator 1 control Evaporator 2 control Condenser pump control

Legend

* Associated functions, if selected: automatic changeover, pump 1 and 2; manual or CCN selection; periodical; by default.

Connector/ channel

J5/CH17

J5/CH18

J2/CH19 J2/CH20 J2/CH21

Terminal Description

This contact is used to detect lack of condenser water flow and shuts down the unit.

This contact is used to detect an evaporator pump operation fault and switches over to the other evaporator pump*.

This contact permits control of evaporator 1 pump by the unit*. This contact permits control of evaporator 2 pump by the unit*. This contact permits control of condenser pump by the unit*.

Remarks

24 V a.c - 20mA

24 V a.c. internal supply. Max. consumption

- each output: 20 VA/10W

- for all 3: 40 VA/20 W if all are used

4 - SETTING UP PRO-DIALOG PLUS CONTROL

4.1 - Local interface general features

MAIN INTERFACE SUMMARY INTERFACE

DUAL-CIRCUIT AIR-COOLED

MENU BLOCK

CHILLER INTERFACE

The local interface enables a number of operating parameters to be displayed and modified.

The interface consists of two distinct parts: the main interface (left hand section) and the summary interface (right hand section).

MAIN INTERFACE SUMMARY INTERFACE

DUAL-CIRCUIT WATER-COOLED

MENU BLOCK

CHILLER INTERFACE

Main interface

It gives access to all PRO-DIALOG PLUS data and operating functions. It consists of:

• A two-digit display showing the number of the item selected.

• A four-digit display showing the contents of the item selected.

• LEDs and buttons for unit start/stop, menu selection, menu item selection and value adjustment.

MAIN INTERFACE BUTTON NAME DESCRIPTION

Menu Permits the selection of a main menu. Each main menu is represented by an icon. The icon is lit if active.

Up arrow Permits scrolling through the menu items (in the two-digit display). If the modification mode is active this button authorises

Down arrow Permits scrolling through the menu items (in the two-digit display). If the modification mode is active this button authorises

Enter Gives access to the modification mode, validates a modification or displays expanded item description.

Start/stop Authorises start or stop of the chiller in local mode or modification of its operating type.

MAIN INTERFACE MENU LEDS LED NAME DESCRIPTION

INFORMA TIONS men u Displays the general operating parameters for the unit.

TEMPERATURES menu Displays the unit operating temperatures.

kPa

PRESSURES menu Displays the unit operating pressures.

SETPOINTS menu Displays the unit setpoints and enables them to be modified.

INPUTS menu Displays the status of the unit digital and analogue inputs.

OUTPUTS/TESTS menu Displays the status of the unit outputs and enables them to be tested.

increase of the value of any parameter.

decrease of the value of any parameter.

CONFIGURATIONS menu Displays the unit configuration and enables it to be modified.

ALARMS menu Displays active alarms.

ALARMS HISTORY menu Displays the history of the alarms.

OPERATING LOG menu Displays the operating times and number of starts for the unit and the compressors.

The summary interface (right hand section) includes a mimic diagram of the unit, together with push-buttons and LEDs. It gives quick access to the main operating parameters of the unit.

SUMMARY INTERFACE LEDS LED INDICATION WHEN LIT

Green LED:

The unit is authorised to start or is already running

Red LED:

- Lit: circuit A or unit shut down by alarm

- Flashing: circuit A or unit running with alarm present

Red LED:

- Lit: circuit B or unit shut down by alarm

- Flashing: circuit B or unit running with alarm present

Red LED:

Water flow switch default or user safety lock open.

Green LED:

The evaporator pump is running.

Yellow LEDs:

From top to bottom - start/stop status of compressors A1, A2, A3 and A4 or B1, B2, B3 and B4. Flashing LED indicates that the circuit is in the protection or defrost mode (A or B).

Green LED:

The unit operates in heating mode.

Green LED:

The unit operates in cooling mode.

The following operating types can be selected using the Start/Stop button:

OPERATING TYPES 4-DIGIT DISPLA Y DESCRIPTION

LOFF Local Off. The unit is halted in local mode. L-On Local On. The unit is in local control mode and is authorised

to start.

L-Sc* Local On - timer control. The unit is in local control mode. It

is authorised to start if the period is occupied. If the timer program for unit operation is unoccupied, the unit remains

shut down until the period next becomes occupied. CCN* CCN. The unit is controlled by CCN commands. rEM* Remote. The unit is controlled by remote control contacts. MAST* Master Unit. The unit runs as a master in a two unit lead/lag

arrangement. This is displayed if the unit is configured for

master/slave control. See section 5.19.

Legend

* Displayed if the configuration requires it.

Section 5.1 gives a more detailed description of the commands to start/stop the unit, analysed by operating type.

4.2.2 - Stopping the unit in local mode

The unit can be stopped in local mode at any time by pressing the Start/Stop button.

SUMMARY INTERF A CE PUSH BUTTONS BUTTON DISPLAY

Blue button: evaporator leaving or entering water temperature in °C Gray button: outdoor air temperature in °C

Control point (setpoint + reset) in °C

kPa

Press 1: circuit A/B discharge pressure in kPa Press 2: circuit A/B saturated condensing temperature in °C

kPa

Press 1: circuit A/B suction pressure in kPa Press 2: circuit A/B saturated suction temperature in °C

Press 1: compressor A1/B1 operating hours in h/10 or h/100 Press 2: compressor A2/B2 operating hours in h/10 or h/100

4.2 - Unit start/stop control

4.2.1 - Description

The unit start/stop can be controlled by one of the following methods:

• Locally on the actual unit (Local control type)

• By remote control with the aid of user contacts (remote control type)

• By CCN control with the aid of the CCN (CCN control type)

The main interface includes a Start/Stop button which can be used to stop or start the unit in the local operating type or to select the remote or CCN operating type.

The available operating types are described in the following table.

TO STOP THE UNIT BUTTON ACTION 2-DIGIT DISPLAY 4-DIGIT DISPLAY

Press the Start/Stop C LOFF button for less than 4 seconds (one short press is enough).

If the button is t LOFF released, the unit stops without the need for further action.

4.2.3 - Starting unit and selecting an operating type

The unit can be started in local mode, or unit operating type can be changed at any time using the Start/Stop button. In the example that follows, the unit is stopped (LOFF) and the user wants to start the unit in local mode.

CHANGING THE OPERATING TYPE BUTTON ACTION

Continually press the operating type selection button for more than 4 seconds.

Hold down the Start/Stop button. The available operating types are displayed one by one until the button is released.

Release the Start/Stop button if the operating type you want is displayed (in this example LOn). "C" flashes in the 2-digit display to show that the controller is awaiting confirmation.

Press the Enter button to confirm the operating type selected (in this example: LOn). "t" is displayed in the 2-digit display to indicate the operating type selected. If the Enter button is not pressed soon enough, the controller will cancel the change and continue to use the previous operating type.

2-DIGIT 4-DIGIT DISPLAY DISPLAY

C LOFF

L-On L-Sc

rEM

L-On

t L-On

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