Clivet Carel Pco

8/12/2019 Clivet Carel Pco

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Carel PCO System

USERS GUIDE

Version October 2000


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PCO USER S GU IDE

Pco Carel Version October 2000 2/80


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3/80 Version October 2000 Pco Carel

CONTENTS:

1.0 INTERFACE CONTROL MODULE......................................................................................................... 51.1 INTERFACE MODULE MAIN MASK................................................................................................... 5

2.0 FUNCTIONS OF THE KEYS.................................................................................................................. 62.1 INFO, HEAT, COOL KEYS ................................................................................................................. 7

3.0 PROGRAMMING THE CONTROL SET-POINTS.................................................................................... 84.0 OPERATING STATUS OF THE VARIOUS UNIT COMPONENTS... ....... ....... ........ ....... ....... ....... ....... ..... 9

4.1 I/O MENU (INPUT/OUTPUT) .............................................................................................................. 95.0 MONITORING THE UNITS OPERATING STATUS.............................................................................. 106.0 SETTING THE TIME BANDS ............................................................................................................... 117.0 ALARM SIGNALS AND MANAGEMENT .............................................................................................. 12

7.1 ALARM KEY ..................................................................................................................................... 127.2 ALARM LIST..................................................................................................................................... 12

8.0 ACCESSING THE I/O MENU............................................................................................................... 159.0 ACCESSING THE MAINTENANCE MENU .......................................................................................... 1610.0 ACCESSING THE CLOCK MENU...................................................................................................... 18

10.1 CLOCK KEY ................................................................................................................................... 1811.0 ACCESSING THE USER MENU ........................................................................................................ 1912.0 ACCESSING THE MANUFACTURER MENU..................................................................................... 21

12.1 ACCESSING THE MANUFACTURER SUBMENUS........................................................................ 2112.2 FUNCTIONS AVAILABLE IN THE SUBMENUS.............................................................................. 21

13.0 INITIALISING THE CONTROL MODULES......................................................................................... 2414.0 GENERAL DESCRIPTION OF THE UNIT'S OPERATING PARAMETERS....... ....... ........ ....... ....... ..... 25

14.1 USER MENU (MEANING OF THE PARAMETERS) ........................................................................ 2515.0 MANUFACTURER MENU (MEANING OF THE PARAMETERS)... ....... ....... ........ ....... ....... ....... ....... ... 28

15.1 UNIT CONFIGURATION SUBMENU ............................................................................................ 2815.2 COMPRESSOR SUBMENU ......................................................................................................... 3015.3 CHANGE PASSWORD SUBMENU .............................................................................................. 3115.4 INITIALISE UNIT SUBMENU........................................................................................................ 31

16.0 DEFROST.......................................................................................................................................... 3216.1 TEMPERATURE DEFROST ONLY METHOD................................................................................. 3216.2 PRESSURE + TEMPERATURE DEFROSTING METHOD.............................................................. 3316.3 COMMON OR SINGLE DEFROSTING ........................................................................................... 33

17.0 WRAN UNITS + TOTAL RECOVERY................................................................................................. 3417.1 UNIT SELECTED AS HEAT PUMP. HEAT RECOVERY ENABLED. ....... ....... ........ ....... ....... ....... .... 3417.2 UNIT SELECTED AS WATER CHILLER. HEAT RECOVERY ENABLED. ........ ....... ....... ....... ....... ... 3417.3 OUTLINE OF THE REFRIGERATING CIRCUIT OF THE WRAN UNIT WITH HEAT RECOVERY... 35

18.0 HOW TO CONTROL A MULTI-UNIT LOCAL NETWORK (MASTER SLAVE CONFIGURATION) ....... 3618.1 GENERAL INDICATIONS FOR LOCAL NETWORK CONNECTIONS:........ ....... ....... ....... ........ ....... 3819.2 PROGRAMMING EXAMPLE:.......................................................................................................... 39

19.0 DAY/NIGHT OPERATION (Starting from the 3.502 software version)............................................... 4019.1 SETTING THE TIME BANDS.......................................................................................................... 41

20.0 PUMP DOWN MANAGEMENT (Starting from the 3.502 software version)......... ........ ....... ....... ....... .... 42IN THE REVERSIBLE UNITS..................................................................................................................... 4221.0 THERMOREGULATOR OPERATION ................................................................................................ 4322.0 SET-POINT COMPENSATION........................................................................................................... 45

22.1 SET-POINT COMPENSATION ACCORDING TO THE READING OF AN EXTERNALTEMPERATURE PROBE ....................................................................................................................... 45

22.1.1 CONFIGURATION OF THE OPERATING MODE...................................................................... 4522.1.2 CALCULATION OF THE SUMMER AND WINTER COMPENSATED SET-POINT........... ....... ... 4722.1.3 CONTROL FLOWCHART ......................................................................................................... 4722.1.4 ENABLING DIGITAL INPUT...................................................................................................... 48

22.2 SET-POINT COMPENSATION THROUGH A 4-20mA SIGNAL......... ....... ........ ....... ....... ....... ....... ... 4922.2.1.OPERATING MODE CONFIGURATION (HEATING AND/OR COOLING MODE)...... ....... ........ . 4922 22 ..22 ..22 CONNECTION OF THE GENERATOR OF THE 4-20 Ma SIGNAL ............................................ 51

23.0 FREE COOLING MANAGEMENT FOR CRT CRN UNITS ............................................................... 5223.1 OPERATING LOGIC FLOW CHART............................................................................................... 5323.2 FAN-ONLY OPERATION................................................................................................................ 5523.3 HEATING MANAGEMENT IN CRT COOLING-ONLY UNITS... ....... ....... ........ ....... ....... ....... ....... ... 55


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1.0 INTERFACE CONTROL MODULE

Clivet Code C5110910

The drawing on the left illustratesthe interface control module whichis the only part of the control sys-tem visible to the final user.This electronic module is providedwith a Liquid Crystal Display of 4rows by 20 columns and is con-nected to the local network of basemodules through a 6-way tele-phone-type lead. The terminal issupplied from the base modulethrough the same cable.

1.1 INTERFACE MO DULE MA IN MASK

On the second line, next to GRD, a variable number (from 2 to 8) of square marks, indicates the available ca-pacity steps installed in the unit. A full mark indicates an active step. On the contrary, an empty mark indicates aninactive step.

Again in the second line, an intermittent AL symbol indicates an alarm condition in at least one of the modulesconnected in the network. If no off-normal condition occurs, the AL symbol is invisible.

The evaporator water inlet/outlet temperatures are displayed in the third line. When the WRHH unit is switched tothe HEATING mode, these temperatures are referred to the condenser inlet/outlet.

In the 4th line, the on/off working status of the unit is displayed. The fourth row displays also the module currently connected with the operator interface (next to MOD).

WARNING!: In multimodule units the temperature probes could be connected to different base modules. If that isthe case, in the main window, a single temperature value (referred to the probe physically connected to the se-lected module) is displayed. In order to display the other value it is necessary (by pressing the INFO key) to jumpto the module which the probe is connected to.

WARNING!All the operations (programming of the parameters, displaying of the statuses and of the operation hours) are to

be referred to the module which is indicated there.

SOFTWARE VERSION


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11 - SET key

It allows the programming of the set points:- Summer temperature- Temperature with installed operating TIME BANDS.

12 - PROGRAMMING key

After the password has been inserted, all the operating parameters can be set.

2.1 INFO, HEAT, COOL KEYS

INFO, HEAT and COOL keys are also present on the panel.

In case of multimodule units, the INFO key allows the operator to move from one base module to another, to display

statuses and alarms, and for the programming of the parameters in the different modules.HEAT and COOL keys provide summer or winter operation in heat pump units.


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3.0 PROGRAMMING THE CONTROL SET-POINTS

Once the refrigeration unit has been installed, a series of operations must be performed in order to set the correct opera-tion of the unit according to the characteristics chosen by the user.

1 Press the SET button to enter the set-point pro-gramming screen: In this way the current value isdisplayed. As soon as the key is pressed, thegreen LED will light up.

2 Press the ENTER button to modify the value. Assoon as the key is pressed the blinking cursor will move to the programmable parameter whichis to be set.

3 The value can be increased or decreased by theUP and DOWN arrows.If the key is pressed once, the value will changeof one tenth of C. If the key is not released thevalue will change rapidly.

4 Press the ENTER key again in order to store thenew value.

Control Set-point TemperatureSummer




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4.0 OPERATING STATUS OF THE VARIOUS UNIT COMPONENTS

4.1 I/O MENU (INPUT/OUTPU T)

The windows of the I/O menu show the operating status of the various components of the unit. Follow these instructionsin order to access all the screens:

I/O

1 By pressing the I/O button the first page, showingthe evaporator chilled water inlet/outlet tem-peratures, is displayed.

2 Go through the other pages by pressing the UPand DOWN keys. When the last page is reached,a simple pressure on the DOWN key shows thefirst again.

Digital Input (1..12)Status

Evap. temperatureInlet Outlet


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5.0 MONITORING THE UNITS OPERATING STATUS

Press the MAINTENANCE key to access the maintenance menu, made up of two distinct parts:1. Directly accessible to the maintenance operator.2. Accessible via password (1234).

1 Press the MAINTENANCE button: the firstscreen concerning the unit operating status isdisplayed. It shows the total hours of operation of the unit and those of the single compressors.

2 Press the DOWN key to go to the next page. Itdisplays the number of the start-ups for eachcompressor.

3 If the DOWN key is pressed again, themaintenance password is requested.The following pages are accessible only by anauthorised service Agency.

Unit operating hoursCompressor 1Compressor 2

Total startsCompressor 1Compressor 2

Enter the maintenance password


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6.0 SETTING THE TIME BANDS

The presence of the operating time bands involves the programming of some parameters. They are accessible by per-forming the following operations:

1 Press the CLOCK button: the first page is dis-played showing current time and date.

2 Press the ENTER key to modify the current time.When the key is pressed, the blinking cursor isshifted under the value which is to be modified.

3 Increase or decrease the value by pressing the UP and DOWN keys. If the key is pressed once, thevalue will change of one hour, if it is not released the value will change rapidly.

4 Press the ENTER key again to confirm the new value.The cursor shifts under the next value. Follow the procedure explained on the previous point. Eachtime the ENTER key is pressed, the cursor will move to the next value which can be modified untilthe cursor reaches the top of the page again. The pages can be paged forward and backward bypressing the UP/DOWN keys. The screens which can be displayed are shown below with a shortdescription.

Set Clock TimeDate

Set Clock TimeDate


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7.0 ALARM SIGNALS AND MANAGEMENT

7.1 ALA RM KEY

When an anomalous working condition occurs the electronic control starts buzzing, the ALARM key is lit-up and the codeof the alarm is shown on the LCD display.

A list of the alarms with the description of the relevant component can be found below.In case of alarm, by striking the ALARM key, the buzzer is silenced. When the cause of alarm is eliminated, the secondstriking of the key makes the unit start again at the usual operating conditions. The display will show NO ALARM.

7.2 ALA RM LIST

GENERAL ALARMS

Alarm Description Relevan t com ponent Disp lay indicat io ns EEE Electronic card internal fault Faulty ROM.

Substitute the Pco.EEE

E00 Evaporator water flow alarm Diff. pressure switch, flow-switchCheck the water flow, the contact of the pr. Switch, the wiring and the wir-ing diagram. If the alarm persists, thePco is to be changed.

FLUSS.EV.

E01 Evaporator antifreeze alarm Evaporator water OUT probeCheck the water flow and the proberesistance by disconnecting it to itsterminals.

GELO

E03 Evaporator inlet faulty probe BT1 probe.Check the water flow and the proberesistance by disconnecting it to itsterminals. Id the value is correct thePco is to be substituted.

SG.B1

E04 Evaporator outlet faulty probe BT2 probe.Check the water flow and the proberesistance by disconnecting it to itsterminals. Id the value is correct thePco is to be substituted..

SG.B2

E05 Maintenance period threshold Call the service centre. ORE.ME06 Faulty master module Possible bad entering of the con-

figuration parameters blocking theunit as a result.Check the parameters

E07 Phase monitor alarm Phase monitor Check with a tester that all elementsare phased with the supply line.

M.FASE

E08 Pump thermal alarm Pump protector Check the pump thermal contact asclosed and that the wiring is properlymade. If the alarm condition persiststhe Pco is to be substituted.

T.POMPA

ALARMS FOR CIRCUIT 1

Alarm Description Relevan t com ponent Disp lay indicat io ns E11 Compressor protector HP fan pro-

tector alarmCompressor KriwanCompressor thermal relayFan thermostatFan thermal relay

HP switchesIf all contacts are closed, the wiringproperly made and the alarm persistseven after the reset the Pco is to bereplaced.

HP.TC.TV.1


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E12 LP Alarm LP switch.If the LP switch contact is closed, thewiring properly made and the alarmpersists the Pco is to be replaced.

LP1

E13 Compressor oil differential pressurealarm

Oil differential pr. switch.Check the oil pr. switch contact, thewiring and the wiring diagram. If eve-rything is OK and the alarm persiststhe Pco is to be replaced.

OLIO1

E14 Compressor maintenance threshold Call the nearest service centre ORE.C1E15 Faulty probe BT3 BT3 probe.

Check the probe resistance by discon-necting it to its terminals. Id the valueis correct the Pco is to be substituted.

SG.B3

E16 Faulty probe BT5 BT5 probe.Check the probe resistance by discon-necting it to its terminals. Id the valueis correct the Pco is to be substituted.

SG.B5

E17 Faulty pressure transducer Pressure transducer.Check that the analogue inputs areable for accepting 420 mA signals. Check with a tester the correctness of the conversion current/pressure.If the transducer is operating, the Pcois to be replaced.

T.HP1

ALARMS FOR CIRCUIT 2

Alarm Description Relevan t com ponent Disp lay indicat io ns E21 Compressor protector HP fan pro-

tector alarmCompressor KriwanCompressor thermal relayFan thermostatFan thermal relayHP switches

If all contacts are closed, the wiringproperly made and the alarm persistseven after the reset the Pco is to bereplaced.

HP.TC.TV.2

E22 LP Alarm LP switchIf the LP switch contact is closed, thewiring properly made and the alarmpersists the Pco is to be replaced.

LP2

E23 Compressor oil differential pressurealarm

Oil differential pr. SwitchCheck the oil pr. switch contact, thewiring and the wiring diagram. If eve-rything is OK and the alarm persiststhe Pco is to be replaced.

OLIO2

E24 Compressor maintenance threshold Call the nearest service centre ORE.C2

E25 Faulty probe BT4 BT4 probeCheck the probe resistance by discon-necting it to its terminals. Id the valueis correct the Pco is to be substituted.

SG.B4

E26 Faulty probe BT6 BT6 probeCheck the probe resistance by discon-necting it to its terminals. Id the valueis correct the Pco is to be substituted.

SG.B6

E27 Faulty pressure transducer Pressure transducer Check that the analogue inputs areable for accepting 420 mA signals.Check with a tester the correctness of the conversion current/pressure.If the transducer is operating, the Pcois to be replaced.

T.HP2


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8.0 ACCESSING THE I/O MENU

Press the I/O button

Press the DOWN arrow to display the other screens

The table below shows all the unit control windows:

I/O MENUScreen Value

1 Evaporator temperatureIN: COUT: C

2 TemperatureBT3 probe (the actual name depends on the unit): C

BT4 probe (the actual name depends on the unit): C3 Recovery temperature (BT5) if the recovery is enabled,

otherwise :C

Suction 1: (BT5) / Recovery CSuction 2: (BT6) / External temperature C

4 Ambient relative humidity %5 High pressure

Circuit 1:Circuit 2: bar

6 Digital input status bar 12 characters, linked to a specific pCO digital inputC= the contact connected to the input is closedO= the contact connected to the input is open

Refer to DIGITAL INPUTtable

7 Digital output status13 characters, linked to a specific pCO digital outputC= the relay contact is closed (output active)O= the relay contact is open (output inactive)

Refer to DIGITAL OUTPUTtable

8 Compressor 1: ON/OFFLiquid solenoid 1 / Reverse cycle valve 1: ON/OFFCompressor 2: ON/OFFLiquid solenoid 2 / Reverse cycle valve 2:: ON/OFF

9 Capacity control step num. 1 ON/OFFCapacity control step num. 2 ON/OFFFan num. 1 / Condenser pump (WRH) ON/OFFFan num. 2 / Water side reversal (WRHH) ON/OFF

10 Part-winding 1: ON/OFFPart-winding 2: ON/OFF

Electric pump: ON/OFF Antifreeze heater: ON/OFF11 CLIVET srl

Unit serial number:Software version:

12 CLIVET network module: numberI/O 1..4 - I/O 6..9 I/O 11..14

A box indicates the presenceof the module in the network.

A point indicates the oppo-site.

13 Networked compressorsNetwork diagnostics screen:


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9.0 ACCESSING THE MAINTENANCE MENU

Press the MAINTENANCE key

The second screen will be displayed after the DOWN arrow is pressed.

If the DOWN arrow is pressed again the system will ask for the password toenter the protected part of the MAINTENANCE menu.

Move the blinking cursor to the numerical password field by pressing theENTER key

Use the UP and DOWN arrows to enter the correct number.

Press ENTER and, if the password is correct, the display will show CORRECTPASSWORD.WARNING: if the message WRONG PASSWORD is displayed, the cursor must be moved back to the numeric field and the password must be enteredagain.

Press the DOWN key to enter the hidden part of the MAINTENANCE menu.

The table below lists the signals and parameters for programming the unit.

MAINTENANCE MENUDirectly accessible level Value

1 Operating hoursUnit: 00000Compressor 1: 00000Compressor 2: 00000

2 Total startsCompressor 1: 00000Compressor 2: 00000

MAINTENANCE MENUPassword protected level Value

3 Enter maintenance password 099994 Maintenance threshold hours

Unit hoursCompressors hours

5 Reset working hoursUnit YES/NOCompressor 1 YES/NOCompressor 2 YES/NO

6 Reset starting counter Compressor 1 YES/NOCompressor 2 YES/NO

7 ExclusionCompressor 1 YES/NOCompressor 2 YES/NO

8 Offset hour counter

Unit hoursCompressor 1 hoursCompressor 2 hours


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9 Probe calibration( B1 ) Water IN C( B2 ) Water OUT C

10 Probe calibrationPressure 1 bar Pressure 2 bar

11 Probe calibration

Probe B3 CProbe B4 C12 Probe antidisturbance filter YES/NO1323 Alarm log

10 screens where the last 22 occurred alarm are stored inchronological order. The alarm n1 is the most recent.

24 New MAINTENANCE password 09999


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11.0 ACCESSING THE USER MENU

Press the PROG. Key

Move the blinking cursor under the numerical field by pressing theENTER key

With the arrow UP and DOWN write the number 1234

Press ENTER and, if the password is correct, the display will showCORRECT PASSWORD.WARNING: if the message is WRONG PASSWORD, the cursor must bemoved again to the numeric field and the password must be insertedagain.

Press the DOWN key to enter the 1st

screen of the USER menu.

NB: If more than one Pco module is installed in the unit, the information displayed is referred to the module actually ad-dressed. The operator can switch to the different modules by pressing the INFO key. Moreover, at any time, by pressingthe PRINT key, it is possible to check which module is actually connected.

USERMENU PARAMETER SELECTIONUSER 1 Winter temperature set point limit

Min.: CMax: C

2 Summer temperature set point limitMin.: CMax: C

3 Temperature regulation bandSummer: CWinter: CNight*: C

4 Offset local master modulesN2: CN3: C

5 Temperature regulation dead zone: CProbe used for control: IN/OUT

6 Recovery managementSet Point recovery enabling: C

Operation band: C7 Remote ON/OFF enabling: YES/NO

Remote Summer/Winter enabling: YES/NO8 Low temperature threshold water at condenser inlet: C9 High temperature threshold at the evaporator inlet: C10 Evaporator outlet low temperature alarm (WRHH units)

Set-point: CTime: sec

11 Antifreeze alarm Alarm set point: CDifferential: C

12 Antifreeze heater Switch on set-point: CDifferential: C


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MENU PARAMETER SELECTIONUSER (continue) 13 Defrost, temperature controlled

Set start: CSet end: C

14 Pressure controlled defrost cycleSet start: bar Set end: bar

15 Defrost cycle time settingsCumulative time interval SecMaximum time: sec

16 Max. LP switch interventions per hour Unit17 Unit address in the supervisory network Unit18 Compressor start-up delay: sec

Pump switch-off delay: sec19 LP alarm signalisation delay: sec

Delay in the signalisation of the oil differential alarm: sec20 Delay in the takeover of the flow switch alarm

In operation: secDuring start-up Sec

21 High pressure alarmSet-point: bar Differential: bar

22 Type of temperature control: P/P+IIntegration time for P+I control: sec

23 Part-WindingTime: (100 = 1 sec) sec*100

24 Outside temp. limit summer compensationMinimum: CMaximum: C

25 Set-point limit summer compensationMinimum: CMaximum: C

26 Outside temp. limit winter compensationMinimum: C

Maximum: C27 Set-point limit winter compensation

Minimum: CMaximum: C

28 Free-cooling managementStart Offset: CEnd Offset: CDelta: C

29 Enthalpic Free-cooling managementLimit rH%: %Delta rH%: %

30 Set-point ResetMinimum current mAMaximum current mAMaximum reset C

31 Condensation pump (WRH-WRHH), 17/09/99-5200Comp. ON delay secElectric pump off delay sec

32 Set new user password: number

The parameters marked with this symbol are displayed only if they are pertinent with the unit configuration.


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12.0 ACCESSING THE MANUFACTURER MENU

Press the keys PROG. and MENU together.Keep them pressed until the MANUFACTURER password is requested.NB: It could be necessary to try more than once

Move the blinking cursor to the password field by pressing the ENTERkey.

Press the UP and DOWN keys until the value 1234 is shown.

Press ENTER and, if the password is correct, the display will showCORRECT PASSWORD.WARNING: if the message is WRONG PASSWORD, the cursor must bemoved again to the numeric field and the password must be insertedagain.

Press the DOWN key to enter the 1 st screen of the MANUFACTURERmenu.

The main screen of the MANUFACTURER menu shows its four submenus.

12.1 ACC ESSING THE MANUFA CTURER SUBMENUS

Press once or more than once the UP-DOWN keys (each time the key ispressed the cursor will move to the next line) until the cursor is under theselected submenu.When the cursor is under the selected menu, press the ENTER key.

12.2 FUNCTIONS AVAILA BL E IN THE SUBMENUS

When the blinking cursor is in the top right of the display:- The UP and DOWN keys allow the paging of the screens..- The ENTER key allow the user to enter the value field of the parameters.

When the cursor is in the value field of a parameter:- The UP and DOWN keys allow the new setting of one parameter - With the ENTER the operator can shift to another parameter or exit the modify mode.

Press the MENU key to return to the previous level.

The following table lists all the parameters in the MANUFACTURER menu. The parameters marked with this symbol only appear if featured in the units configuration.

MANUFACTURER MENUSUBMENU PARAMETER SELECTIONUNIT CONFIGURATION 1 Clock card: YES/NO

Printer connected: YES/NOSupervisory system: YES/NOCapacity step function logic: DWM-COP/

FEDDERS2 Cycle inversion valve operation logic: NORMAL /

REVERSCompressor rotation inhibition: YES/NOExternal recovery: YES/NO


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3 Global parametersUnit type: WRAT-WRAN

MCAT-MCANWRHH-WRHCRT-CRN

Compressors: 1,2,3,4Number of modules 1,2,3,4

4 Local parametersNumber of compressors: 1,2Tandem compressors: YES/NOCapacity control steps per compressor: 0,1,2,3

5 Number of local MASTER modules: 1,2,3Recovery: ENABLED. /

DISABLED.Day/Night control installed YES/NO

6 Configuration Y1: Standard / spe-cial

Freecooling: YES/NOCRT heating YES/NOB7 as humidity: YES/NO

7 Probes enable:

Probe B1: YES/NOProbe B2: YES/NOProbe B3: YES/NOProbe B4: YES/NOProbe B5: YES/NOProbe B6: YES/NO

8 Pressure transducersCircuit 1: YES/NOCircuit 2: YES/NOStart scale -1050End scale -1050

9 Presence of compensationSummer: YES/NOWinter: YES/NO

10 Enable compensation with: External probe /4-20 mA signal

11 Unit identificationC1 (Unit type) WRAT-WRAN

WRH-WRHH-MEMCAT-MCANWRA-WRNWSH-WSHHWSA-WSNWSAT-WSANCRT-CRN-MSEMSAT-MSAN

C4 (Configuration) LN (low noise)EN (extra LN)ST (standard)

C7 (revision) AZ - 09C2 (Version) AZ - 09C5 (Application) AZ - 09C3 (Size) 09 - 0999C6(approval) AZ - 09

12 Unit serial number: AZ - 0913 Communication speed with supervisor: bps


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COMPRESSORS 1 Minimum off time compressor SecMinimum running time compressor Sec

2 Time between start same compressor: secTime between start different compressors: sec

3 Capacity step function delay secCompressor start by pass from DAY/NIGHT switching sec

4 Type of local defrost Simultaneous

Non simultane-ous Type of global defrost Simultaneous

Non simultane-ous

5 Pump Down enable YES/NO Maximum Pump-Down time* Sec

6 Force tandem compressors YES/NOForcing time sec

7 Request manual activation of the capacity step YES/NOC: (compressors)P: (capacity steps)

SUBMENU PARAMETER SELECTIONCHANGE PASSWORD 1 Set new manufacturer password 09999

INITIALISE UNIT 1 Initialise unit (install default values) YES/NO


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13.0 INITIALISING THE CONTROL MODULES

At the first start-up of the control modules, the module addressing is the first operation to carry out.

NOTE: the unit leaves the factory with the electronic modules already configured.Use the Dip-Switches to assign a physical address to the pCO modules and the interface terminals. Power the unit andnote that after a few seconds the terminal will read NO LINK, and the ENTER key will light up.This is normal, as even though the address of the modules has been set on dip-switches, this still needs to be done bysoftware.

With the modules powered press the MENU , MAINTENANCE and PRINT keys at the same time, and hold them until thedisplay comes on (around 5 seconds).

The display now shows:

Terminal Adr: 5I/O Board Adr: *

* this can be either 1 in case of master module or 2 (in case of slave module

The address of the Terminal (5) cannot be modified and must remain unchanged. On the contrary, the I/O Board ad-dress must be adjusted with the UP/DOWN keys. The appropriate value corresponds to that of the module which is beinginitialized ( 1 if only one module is installed)Once the operation has been performed press ENTER.WARNING! This screen will disappear automatically in 15 seconds since the last key is pressed. Once the ENTER key ispressed, this message will appear in a few seconds:

Terminal Config.Press ENTERto continue

Press ENTER. The display will show:

P:01 Adr Priv/SharedTrm1: 05 SHTrm2 NoneTrm3 None OK? Y

WARNING! The correct values are different from those shown in the screen. The correct ones are shown above. Bypressing ENTER, the blinking cursor will move to the different fields. Values can be modified with the arrow keys.The UNIT INITIALIZATION operation is achieved as soon as the ENTER key is pressed in the last field. It is now possi-ble to set the parameters.

N.B.: THE OPERATION IN THE FRAME MUST BE REPEATED FOR EVERY BASE MODULE WHICH ISCONNECTED IN THE LOCAL NETWORK


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14.0 GENERAL DESCRIPTION OF THE UNIT'S OPERATING PARAMETERS

14.1 USER MENU (MEANING OF THE PA RAMETERS)

WINTER TEMPERATURE SET POINT LIMITSets the minimum and maximum limit for setting the Winter set-point

SUMMER TEMPERATURE SET POINT LIMITSets the minimum and maximum limit for setting the Summer set-point

TEMPERATURE CONTROL BANDConsidering the temperature control dead zone set to zero, the following are valid:Summer control band: Once the Summer set-point and summer control band values have been set, the thermoregula-tor automatically defines the activation points of the various capacity control steps available. In this way, when the tem-perature of BT1 rises above the temperature set by the Summer set-point parameter, the thermoregulator activates allthe capacity control steps so as to force the unit to decrease the temperature at the evaporator inlet.Winter control band: Once the Winter set-point and winter control band values have been set the thermoregulator automatically defines the activation points of the various capacity control steps available. In this way, when the tempera-ture of BT1 falls below the temperature set by Winter set-point parameter, the thermoregulator activates all the capacitycontrol steps so as to force the unit to increase the temperature at the evaporator inlet.Night-time control band: A contact can be used to enable two separate unit operating modes, that is day/night. Innight-time mode, a new Set-point and a new night-time control band are set. For this purpose, the electronic control hasbeen fitted with a clock card, which manages the change-over of the working set point of the refrigeration unit.

LOCAL MASTER OFFSETEach Local master defines a unit, and can have up to three Slave modules connected and a local interface terminal. TheLocal masters communicate with each other and can be connected to a single terminal, with address 01 (called the Gen-eral Master), which can access each of the Master or Slave modules connected to the network. The General Master canbe used to set the local master n2 and local master N3 offset.

TEMPERATURE CONTROL DEAD ZONESets the temperature value over the set point that the unit must attend before activating the first power step. This is al-ways set to zero .

PROBE USED FOR THE CONTROL:Sets whether the temperature control probe used is at the evaporator inlet or outlet.

HEAT RECOVERY MANAGEMENTInvolves the heat recovery from the heat pumps only, and is managed directly by the pCO to allow the possibility of do-mestic hot water production. The activation of the heat recovery feature is managed by the Set-point heat recovery andworking band parameters (user menu), enable/disable heat recovery (manufacturer menu, unit configuration sub-menu).

ENABLE REMOTE ON/OFFEnables or disables the digital input ID1 (J4-1) corresponding to the Remote on/off.

ENABLE REMOTE WINTER/SUMMER

Enables or disables the digital input ID5 (J4-5) corresponding to the remote summer/winter selection.

CONDENSER INLET WATER LOW TEMPERATURE THRESHOLDDetermines the temperature below which the compressors are capacity-controlled. Corresponds to the heat pumps.

EVAPORATOR INLET WATER HIGH TEMPERATURE THRESHOLDDetermines the temperature above which the compressors are capacity-controlled. Corresponds to the chillers.

EVAPORATOR OUTLET LOW TEMPERATURE ALARM FOR WRHHSet-point: Represents the water temperature at the evaporator outlet below which the low temperature alarm is acti-vated.Time: Defines the time which elapses between the moment when the temperature of the probe rises above the Set-point, and the moment when the alarm is automatically reset by the pCO.

ANTIFREEZE ALARMSet-point: Represents the water temperature at the evaporator outlet below which the antifreeze alarm is activated.Differential: Determines the activation differential for the antifreeze alarm; the alarm condition remains until the tem-perature rises above the Set-point + Differential.


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ANTIFREEZE HEATERActivation set-point: Determines the threshold below which the antifreeze heaters are on.Differential: Represents the differential for the activation and deactivation of the antifreeze heaters.

PRESSURE CONTROLLED DEFROSTINGStart set-point: Sets the pressure below which the defrost cycle starts.End set-point: Sets the pressure above which the defrost cycle ends.

TEMPERATURE CONTROLLED DEFROSTINGStart set-point: Sets the temperature below which the defrost cycle starts.End set-point: Sets the temperature above which the defrost cycle ends.

TIMED DEFROSTINGCumulative time: Sets the time during which the temperature/pressure must remain below the Start set-point threshold,with the compressor on, before a defrost cycle is activated.Maximum time: Represents the maximum duration of a defrost cycle.

MAX NUMBER OF LOW PRESSURE SWITCH ACTIVATIONS PER TIMEDetermines the maximum number of times the low pressure switch can be activated over a set time, to bring about itsautomatic reset, in the event of operating anomalies. Activations which are by-passed or occur during Pump-Down arenot counted.

UNIT ADDRESS FOR SUPERVISOR NETWORKS

Sets the address of the unit for serial connection to a supervisory or telemaintenance computer

COMPRESSOR ACTIVATION DELAYSets the time which elapses from when the electric pump starts on the evaporator, to when the first compressor starts(once the relative time settings have been attended).

ELECTRIC PUMP SHUT-DOWN DELAYSets the time which elapses from when the unit is switched off (OFF), to when the electric pump on the evaporator shutsdown.

LOW PRESSURE ALARM DELAYSets a delay in recognising the low pressure alarm upon the start-up of the compressor, to allow the standard operatingconditions to be reached. This delay is also attended on reversal of the 4-way valve.

OIL DIFFERENTIAL ALARM ACQUISITION DELAYDetection of the oil differential pressure alarm is active only when the compressor is on. The compressor must only shut-down if the contact on the digital input corresponding to the oil differential pressure switch stays open for a cumulativetime greater than the value in seconds set by the parameter "Oil differential alarm acquisition delay". (function availableas from 17/09/99, EPROM 5200)

FLOW-SWITCH ALARM ACQUISITION DELAYIn operating conditions: Sets the delay in recognising the flow-switch alarm, to filter momentary variations in flow rateor pockets of air present in the water circuit.Upon start-up: To wait for the flow rate to reach standard conditions, sets a delay in recognising the flow-switch alarmafter the start-up of the water pump.

HIGH PRESSURE ALARMSet-point : Corresponds to units fitted with pressure transducers. Represents the value of pressure above which the"high pressure" alarm is activatedDifferential : Defines how much the pressure must decrease from the Set-point for the high pressure alarm to be reset.

TYPE OF TEMPERATURE CONTROLDetermines the type of temperature control:P = proportionalP+I = proportional + integral

PART-WINDINGTime: For motors with two windings, sets the delay which elapses between the activation of the first winding and the ac-tivation of the second.

OUTSIDE TEMP. LIMIT FOR SUMMER COMPENSATIONMinimum: Determines the assumed minimum outside temperature in the location of the system during the summer sea-son.

Maximum: Determines the assumed maximum outside temperature in the location of the system during the summer season.


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SET POINT LIMIT WITH SUMMER COMPENSATIONMinimum: Determines the value of temperature to set to the unit's Summer Set-point, corresponding to the maximumoutside summer temperature.Maximum: Determines the value of temperature to set to the unit's Summer Set-point, corresponding to theminimum outside summer temperature.

OUTSIDE TEMP. LIMIT FOR WINTER COMPENSATIONMinimum: Determines the assumed minimum outside temperature in the location of the system during the winter sea-son.Maximum: Determines the assumed maximum outside temperature in the location of the system during the winter sea-son.

SET POINT LIMIT WITH WINTER COMPENSATIONMinimum: Determines the value of temperature to set to the unit's Winter Set-point, corresponding to the maximum out-side winter temperature.Maximum: Determines the value of temperature to set to the unit's Winter Set-point, corresponding to the minimum out-side winter temperature.

FREECOOLING MANAGEMENTStart Offset: Determines the value in C of the outside temperature read by the active probe B6 which mustbe reached to enable Free-cooling. This value is calculated by adding the numeric value of this parameter (Start Offset) to the cooling Set-point.End Offset: Determines the value in C of the outside temperature read by the active probe B6 which must be reachedto disable Free-cooling. This value is calculated by adding the numeric value of this parameter (End Offset) to the coolingSet-point.Free-cooling Delta: When the conditions dictated by the above parameters are such as to allow Free-coolingoperation, it is essential to determine, starting from the cooling Set-point (Max Free-cooling) the T Delta inwhich the signal at the output Y1 is controlled. In these conditions, the Free-cooling Delta represents thetemperature value (B1), which added to the value of the cooling Set-point, determines the minimum Free-cooling point (Y1= 6.5V).

ENTHALPIC FREECOOLING MANAGEMENTEnthalpic Free-cooling requires the presence of an ambient humidity probe, essential for optimising the conditions of "ambient comfort" according to the temperature and the relative humidity of the outside air.Relative humidity limit:Sets the optimal value of the relative humidity of the outside air at the unit's temperature Set-point.

The regulator calculates, based on this parameter and the delta between the outside temperature and unit's Set-point,the maximum outside rH% limit for disabling Free-cooling.Relative humidity delta: After Free-cooling has been inhibited due to maximum rH%, it can be reactivated when theRelative humidity falls below this value, in respect to the maximum calculated limit.

RESET SET POINTMin curr.: In units configured for variation of the set-point according to the 4-20 mA signal, is the current (mA) corre-sponding to the minimum variation of the unit set-point.Max curr.: In units configured for variation of the set-point according to the 4-20 mA signal, is the current (mA) corre-sponding to the maximum variation of the unit set-point.Max Reset: In units configured for variation of the set-point according to the 4-20 mA signal, determines, starting fromthe unit set-point, the variation (C) of the compensated Set-point, from the minimum Reset point to the maximum Resetpoint.

CONDENSATION PUMP (WRH-WRHH)Comp. ON delay: If the thermoregulator requests power, the condenser pump is activated, and after the time in secondsset by parameter "Comp. ON delay", starts the compressor. (feature available as from 17/09/99, EPROM 5200)Electric pump shut-down delay: If the last active compressor is shut-down, (following an alarm or because the thermo-regulator is satisfied), and no capacity control steps are activated within the time set by the parameter "Electric pumpshut-down delay", the condenser pump is deactivated. (feature available as from 17/09/99, EPROM 5200)

SET NEW USER PASSWORDOffers the operator the possibility to set a new password to access the user parameters.


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15.0 MANUFACTURER MENU (MEANING OF THE PARAMETERS)

15.1 UNIT CONFIGURATION SUB MENU

CLOCK CARDIt is at times useful to be able to modify the units Set-point based on the thermal requests of the various devices con-

nected to the system, especially at night. This parameter enables or disables a clock card, which is physically mountedon the main electronic control, and which manages the changes in the working point of the refrigeration unit.

PRINTER PRESENCEEnables or disables the presence of a printer.

SUPERVISOREnables or disables the connection of a control supervisor to the unit.

CAPACITY CONTROL STEP LOGICThis parameter allows the type of capacity control to be selected, DWM-COP or FEDDERS. Normally, DWM-COP isused: digital output active, relay energised .

REVERSE CYCLE VALVE LOGICNormal: Relay energised for chiller, de-energised for heat pump.Reverse: Relay de-energised for chiller, energised for heat pump.

DISABLE ROTATIONDisable rotation = YES First compressor 1 is started, then 2, 3 and so on. For shut-down, on the other hand, the laston is shut-down first, then the second-to-last, until finally the first on is shut down.Disable rotation = NO To ensure an equal distribution of the operating hours of the compressors, the thermoregulator acts as follows:Compressor start-up: Starts the compressor off the longest time first.Compressor shut-down: Shuts-down the compressor on the longest first.These conditions are valid only for the first stage of the compressors; the capacity control steps are excluded.

EXTERNAL HEAT RECOVERYEnabling external heat recovery for the chiller units, the pCO control unit continues to function normally without beingaware of any variation in operation. An external contact, on the other hand, pilots the valves which, rather than make hotair evaporate on the coils, allow the gas to be condensed in a tube bundle exchanger, which heats the domestic hot wa-ter.

GLOBAL PARAMETERSType of unit: Allows the model of unit being configured to be set.Compressors: Determines the number of compressors in the entire unit.Number of modules: Determines the number of control modules in the entire unit.

LOCAL PARAMETERSNumber of compressors: Determines the number of compressors controlled by an individual moduleTandem Compressors: Selects or deselects tandem type compressors:Setting YES activates the function of forcing the compressor, with Pump-Down managed separately.Capacity control steps per compressor: Determines the number of capacity control steps per compressor.

NUMBER OF LOCAL MASTERSFunction linked to "Units connected in local network"Sets the number of local masters. Each local master can have up to three Slave modules connected.LOCAL MASTER means the master module of each individual unit connected.

HEAT RECOVERYThis parameter enables or disable heat recovery for heat pump units, and is managed, using the parameters Heat re-covery activation set-point and working band (user menu), directly by the pCO control.


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UNIT IDENTIFICATIONC1= type of unit configured.C2= version: S standard R total heat recovery D partial heat recovery B low temperature.C3= size.C4= equipment: ST , standard

SC , compressor acoustical enclosure LN, low noise EN, super low noise.C5= application: T, temperate climate H, high air temperature.C6= approval: C CLIVET internal I ISPESL - Italy D TUV - Germany A TUV - Austria S S.A. - Sweden F SDM - France E MIE - Spain T TTK - Finland U UDT - Poland.

C7= revision.

UNIT SERIAL NUMBERCorresponds to the unit serial number.

COMMUNICATION SPEED WITH SUPERVISORBased on the type of converter used to communicate between the pCO module and the supervisor, after having estab-lished the unit address for supervisor networks (user parameters), this screen can be used to choose between differentcommunication speeds with the supervisor.

15.2 COMPRESSOR SUB MENU

MINIMUM COMPRESSOR OFF TIMEDetermines the time which the compressor must stay off after being shut-down, even if its restart is requested.

MINIMUM COMPRESSOR ON TIMEDetermines the time which the compressor must stay off after being started, even if the effective request no longer ex-ists.

TIME BETWEEN STARTS OF SAME COMPRESSORSets the minimum time which must elapse between two successive starts of the same compressor, to limit the maximumnumber of compressor start-hours.

TIME BETWEEN STARTS OF DIFFERENT COMPRESSORSTo reduce current absorption at start-up, sets a time which delays the start-up between different compressors.

CAPACITY CONTROL STEP START DELAYSets the start delay for the capacity control steps, from the moment when requested to the moment when activated.

COMPRESSOR DELAY FROM DAY/NIGHT CHANGE-OVERWhen changing from day to night operation, the compressors are shut-down and enabled to start again after the delayset by this parameter.

TYPE OF LOCAL DEFROSTSimultaneous: The first compressor to reach the defrost conditions also forces the defrost of the other compressor. Thisoccurs if the second compressor is not shut-down or the temperature on its coil is not greater than the SET STOP (tem-perature). In this case, only the first compressor is defrosted. In the case where the second compressor is being con-trolled by timer settings, its defrosting is delayed to when both compressors can be activated.Non-simultaneous: The first compressor to reach the defrost conditions forces the other to operate in heating cycle atfull power (it is activated if shut-down or forced to full power if capacity-controlled). This occurs if the second compressor is not shut-down. In this case, only the first compressor is defrosted.In the case where the second compressor is being controlled by timer settings, its defrosting is delayed to when bothcompressors can be activated.

TYPE OF GLOBAL DEFROSTThis parameter allows simultaneous or non-simultaneous to be selected at a multi-module level for all the circuits in theunit.


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16.0 DEFROST

The defrosting option is available on WRAN,WRN and MCAN units.The parameters of the defrost algorithm are:

MANUFACTURER Menu:

Local defrost type SimultaneousNon simultaneous

4

Global defrost type SimultaneousNon simultaneous

USER Menu

Defrost temperature controlSet start C

13

Set end CDefrost pressure controlSet start Bar

14

Set end Bar

Defrost TimingDelay time Seconds

15

Maximum time Seconds

The necessity of defrost can be determined with two different ways, depending on the probes which are installed. Thestandard mode unit resorts to a temperature probes only. The advanced mode resorts both to the temperature probesand to pressure transducers.

16.1 TEMPERATUR E DEFROST ONLY METHOD

As soon as the condenser coil temperature (measured with BT3 or BT4) falls below the SET START value (USERSMENU) the defrosting cycle will start.However, the cycle will actually start after a CUMULATIVE DELAY TIME (fixed in the USERS menu) which is controlledby a TIMER.The TIMER starts only if:

The compressor is running, The temperature is equal or lower than the SET START value.

The TIMER will stop if: The compressor is not running, The temperature referred to the condenser coil is higher than the SET START value.

The TIMER is zeroed if: The temperature referred to the coil rises over the SET END value.

As soon as the TIMER reaches the fixed CUMULATIVE DELAY TIME, the defrosting cycle will actually start. Conse-quently:

the unit working cycle is reversed without stopping the compressor, the compressor is switched to its full capacity, the LP alarm bypass timer starts counting, fans are stopped.

The defrosting cycle can stop because: the SET END temperature is reached, the defrosting max. time is reached (USERS MENU)


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16.2 PRESSURE + TEMPERATUR E DEFROSTING METHOD

The defrosting cycle starts as soon as the pressure (BP1 or BP3) falls under the SET START value (USERS MENU).From this moment onward, a CUMULATIVE DELAY TIMER starts counting (USERS menu)

The TIMER starts only if: The compressor is operating,

The pressure is equal or lower than the SET START value.The TIMER will stop if: The compressor is not running, The pressure is higher than the SET START value.

The TIMER will reset if: The pressure rises over the SET START + DIFFERENTIAL value.

As soon as the TIMER reaches the fixed CUMULATIVE DELAY TIME, the temperature (BT3 or BT4) is measured. If this temperature is higher than the SET START temperature the defrosting cycle will pause. If the temperature is higher than the SET END temperature the defrosting cycle timing will be canceled. If the temperature is the same or lower thanSET START, the actual defrosting cycle will start. Consequently:

The unit working cycle is reversed without stopping the compressor The compressor is switched to its full capacity The LP alarm bypass timer starts counting

Fans are stopped.

The defrosting cycle can stop because: The SET END temperature is reached

The defrost max. time is reached (USERS MENU)

16.3 COMMON OR SINGLE DEFROSTING

Each base module can decide its own defrosting cycle. If each compressor has its own condenser coil the cycle will beEXCLUSIVE, while, in case of one condenser coil for the two compressors, the cycle will be COMMON.

COMMON defrosting cycle:The first compressor which reaches the defrost conditions compels the other compressor to defrost as well. This is validonly if the second compressor is not in safety cut-out or if its coil temperature is higher than the SET END value. If that is

the case, the first compressor defrosts by itself.If the second compressor is subject to a time setting process, the defrosting cycle is postponed until both compressorscan be activated.

EXCLUSIVE defrosting cycle:The first compressor which reaches the defrosting conditions compels the other compressor to work to its full power inthe heating cycle (i.e. the second compressor is switched on or forced to its full power if it was working at a lower capac-ity step). This is the case if the second compressor is not in safety cut-out. If that is the case, the first compressor de-frosts by itself.If the second compressor is subject to a timing process, the defrosting cycle is postponed until both compressors can beactivated.

In the same way, the defrosting cycle can be decided between exclusive or common in the unit (multimodular)

using the GLOBAL DEFROST parameter

NOTE: When the defrost is activated ( switched valve ), the low pressure alarm is bypassed for an interval of time equal to the value set on the LOW PRESSURE ALARM BY PASS parameter of the USERS menu.Each compressor has its own bypass time.


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17.0 WRAN UNITS + TOTAL RECOVERYThe 8 solenoid valves of each refrigerating circuit are controlled with relay logic. The Pco indicates the required operationwith 3 digital signals.

Status table of the valves in the different operation conditions (single circuit).Operation Fans SV 1 SV 2 SV 3 SV 4 SV 5 SV 6 SV 7 SV 8Heat pump ON E E D D E D D E

HEAT Total recovery ON D E D D E D E DDefrost OFF D D E E D D E E

Water chiller ON D D E E D D E ECOOL Total recovery ON D E D D E D E D

Chiller + recovery OFF D E E E D E D DE=ENERGIZED valve, D= NOT ENERGIZED valve

Also available:- One parameter enables the RECOVERY version (submenu Configuration in MANUFACTURER menu)- Another parameter sets the RECOVERY SET-POINT (USER menu)- Another parameter sets the RECOVERY OPERATION BAND (USER menu)

The probe for the recovery thermoregulator will be connected at the analogue input B5 . The sensor is placed at the inletof the recovery heat exchanger. It is an active probe with a 1V+1V output.The outputs: NO2-C4, NO4-C4, NO8-C8 change their meaning (see the tables below).The output Fan 1 C7(J24-4-J24-5) keeps the same meaning (ventilation control). This output is enabled if one compres-sor is operating at least.The digital input ID6 (J3-1) will be used as RECOVERY ENABLE .

IMPORTANT If the Phase monitor input (ID6) is kept OPEN, the unit will operate permanently as WATER CHILLER or

HEAT PUMP according to the choice made from the keypad or remote contact. The recovery thermo-regulator is inhibited.

If the Phase monitor input (ID6) is kept CLOSED, the recovery function of the unit is enabled both inHEAT and in COOL operation depending on the choice made with the keypad or by the remote contact.

17.1 UNIT SELECTED AS HEAT PUMP. HEAT RECOVERY ENAB LED.

Both thermoregulators are continuously tested (recovery + winter control) If both thermoregulators require unit operation , the unit is in HEAT PUMP operation and the current number of

activated capacity steps depends on the WINTER thermoregulator. If the WINTER thermoregulator doesnt require unit operation while the RECOVERY one does, the unit is in

TOTAL RECOVERY operation and the current number of activated capacity steps depends on the recovery ther-moregulator.

If the WINTER thermoregulator requires unit operation while the RECOVERY thermoregulator doesnt, the unit isin HEAT PUMP operation. The current number of activated capacity steps depends on the WINTER thermoregu-lator.

If both thermoregulators dont require unit operation the compressors are switched off. If one or both circuits require defrost the unit is in DEFROST operation (common to the 2 circuits).

The following digital outputs will be necessary in order to control the relay logic for the control of the solenoid valvesOperation Output C2 (J5-1-J5-2) Output C4 (J6-7-J6-8) Output C8 (J24-2-J24-2)

TOTAL RECOVERY OFF ON OFFHEAT PUMP OFF OFF OFFDEFROST OFF OFF ON

17.2 UNIT SELECTED AS WATER CHILL ER. HEAT RECOVERY ENABL ED.

Both thermoregulators are continuously tested (recovery + summer control). If both thermoregulators require unit operation , the unit is in RECOVERY+WATER CHILLER operation and the

current number of activated capacity steps depends on the SUMMER thermoregulator request. If the SUMMER thermoregulator doesnt require unit operation while the RECOVERY one does the unit is in

TOTAL RECOVERY operation and the current number of activated capacity steps depends on the RECOVERYthermoregulator.

If the SUMMER thermoregulator requires unit operation and the RECOVERY thermoregulator doesnt, the unit isin WATER CHILLER operation and the current number of activated capacity steps depends on the SUMMER-thermoregulator.

.If both thermoregulators doesnt require unit operation the compressors are switched off.

The following digital outputs are necessary in order to control the relay logic for the control of the solenoid valves


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Operation Output C2 (J5-1-J5-2) Output C4 (J6-7-J6-8) Output C8 (J24-2-J24-2)TOTAL RECOVERY ON ON OFFWATER CHILLER ON OFF OFFCHILLER+RECOVERY ON OFF ON

17.3 OUTLINE OF THE REFRIGERATING CIRCUIT OF THE WRAN UNIT WITH HEAT RECOVERY

EV6

EV7

EV2EV1

EV8

EV3

EV4 EV5

RECUPERO / RECOVER

EVAPORATORE / EVAPORATOR

NOTE: in the outline all the valves are at rest (NOT ENERGIZED)


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18.0 HOW TO CONTROL A MULTI-UNIT LOCAL NETWORK (MASTER SLAVECONFIGURATION)

This configuration allows a group of units, everyone equipped with its own temperature probes at the inlet and outlet of the shell-and tube exchanger, to work as if it were one single unit.

The physical connection between units is made up by a six-wires screened cable connecting all the control modules of the units.

The group of units is constituted by:- One GENERAL MASTER. It is the MASTER local module of the first unit of the group.The address of the

GENERAL MASTER, set in the clock-addressing card, must be set at the value 1.- As many LOCAL MASTERS as the group units, up to a maximum of 3 (including the General Master).A variable

number of SLAVE module if presents.

Figure 1:Minimum extension of a local network.

GENERAL MASTERMODULE

Address = 1

unit 1

Interface module Address = 5

Local MASTERMODULE 2

Address = 6

unit 2Interface module

Address = 10



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Figure 2: Maximum extension of a local network.

GENERAL MASTER MODULE

Address = 1

Slave Module Address= 2

Slave Module Address = 3


unit 1

Modulo di interfacciaIndirizzo = 5


Address = 6

Slave Module Address= 7



unit 2

Interface Module Address = 10


Address = 11

Slave Module Address =12



unit 3


Interface Module Address = 16


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18.1 GENERA L INDICATIONS FOR LOCA L NETWORK C ONNECTIONS:

- In a local network the units must be of the same type, than must have the same number of compressorsand the same number of capacity steps.

- In the LOCAL MASTER modules, at the Modules Number parameter of the Manufacturer menu, the num-ber of modules (Pco) managed by the single unit must be set. This parameter must be set to the value 1in the SLAVE modules (if presents).

- The number of Local Masters must be set in Manufacturer menu, at the Local Master Number parameter of the GENERAL MASTER module.

- In case of reversible units (WRN, WRAN) the management of the Summer/Winter operation has the fol-lowing particularities:

a) Selection made by the interface terminal: The appropriate operation can be decided from any of the terminals of the group. All the connected units will be automatically set to the selected opera-tion.

b) Selection made by Heat/Cool remote terminals: Only the GENERAL MASTER module is enabledto control the remote Heat/Cool inputs. The selection made by this input is valid for all the groupof connected units.

FUNCTIONS:- The local network connection allows to control the group of units by one single Set Point.- In the GENERAL MASTER module the regulation Set Point must be set.- A regulation Set Point value must be set in LOCAL MASTERS.It must be equal to the GENERAL

MASTER one.- Offset values (related to the Set Point) of the connected LOCAL MASTERS, they must be set inGENERAL MASTER.

- The ON/OFF selection, the management of the external validation inputs and the evaporator inlet andoutlet temperature of the single unit are managed on each unit.

- There isnt an ON/OFF general function for the group.

Example of activation of units connected in a local network.

U n

i t a c t

i v a t i o n

Set Point

Offset number 2

Offset number 3

Unit number 1 Unit number 2 Unit number 3

Evaporator inlettemperature

At 23.59 the control system manages also the daily rotation. To obtain this function the addressing +clock optional cardmust be installed.Unit daily rotation is managed according to the table below which anyway doesnt consider the single unit compressor rotation managed by each unit itself.

Operating point Operating point Operating pointday Unit 1 Unit 2 Unit 31 SetPoint SetPoint + offset number 2 SetPoint + offset number 32 SetPoint + offset number 3 SetPoint SetPoint + offset number 23 SetPoint + offset number 2 SetPoint + offset number 3 SetPoint


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19.2 PROGRA MMING EXAMPLE:

Concerning the figure 1 system.

GENERAL MASTER module ( Address 1 )In MANUFACTURER MENU , unit configuration.

Unit type WRATCompressors 2+part.No. Modules 1- -

Local MastersNumber: 2- -- -

In USER MENU :Offset Masters localNumber 2 1.5CNumber 3 0 C

LOCAL MASTERS Module ( Address 6 )In MANUFACTURER MENU , unit configuration.

Unit type WRATCompressors 2+part.No. Modues 1- -


PROGRAMMING EXAMPLE (as shown in figure 2 ):

GENERAL MASTERS module ( Address 1 )In MANUFACTURER MENU , unit configuration.

Unit type WRATCompressors 2+part.No. Modues 4- -


In USER MENU :Offset Masters localNumber 2 1.5CNumber 3 3.0 C

LOCAL MASTERS Module ( Address 6 and 11)In MANUFACTURER MENU , unit configuration.

Unit type WRATCompressors 2+part.No. Modules 1- -



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19.0 DAY/NIGHT OPERATION (Starting from the 3.502 software version)The unit is provided with two separate evaporators. These ones will not work simultaneously.Each evaporator is provided with a water-inlet probe and an outlet one.There are two Set Points named DAY Set Point and NIGHT Set Point. Every one of them is related to its own evaporator.The choice between the two Set Points is made by a digital input ( ID1 of module 2 ).If the clock card is installed, the NIGHT Set Point selection is possible only during the night time interval.

The antifreeze alarm activation is submitted to two separated Set Point parameters. One of them is for day-time opera-tion and the other one for night-time. The DAY-TIME antifreezing Set Point is available on the MASTER control modulewhile the NIGHT-TIME one is available on the the SLAVE 2 module.

HARDWARE:

A digital input of the Pco Slave address 2 (ID1) enables the operation of the unit in Night-Time Set Point. By connecting aselector, or another device provided with a voltage-free contact to the ID1 input, the following possibilities are available:- Open contact, DAY-TIME Set Point operation- Closed contact, NIGHT-TIME Set Point operation

When the contact switches off the NIGHT-TIME/DAY-TIME transition in operation is immediate (except for safetytimings).

If the clock card is installed the DAY/NIGHT transition is postponed until the night time zone. On the contrary, if theclock card is not installed the transition is immediate ( except for safety timings ).The following operation ways can be obtained:

1. Without clock card: there is a contact of a device, that activates and inhibits the NIGHT-TIME operation at certainhours, connected to the ID1 input (module 2 ).

2. With clock card: the ID1 input (module 2) is permanently closed. The clock card activates and inhibits the NIGHT-TIME operation at certain day-times according to what has been set in the CLOCK MENU at the NIGHT-TIMEINTERVAL parameter.

Two digital outputs of the Pco Slave permit to commutate the valves on the refrigerant side towards one of the evapora-tors.- NO12 closed e NO13 open = Day-time operation- NO12 open e NO13 closed =Night-time operation- NO12 closed e NO13 closed = NOT permitted- NO12 open e NO13 open = Unit OFF

- Night-time operation- Compressors by pass from switch on- Activation time of Night-time Set Point- Disactivation time of Night-time Set Point

PROGRAMMING OPERATIONS:

General rules:If the Clock card is installed, the Night-time Set Point is enabled if the enable contact is closed ( Night-time zone ). With-out the Clock card, the Night-time Set Point is enabled as soon as the enable contact is closed..

The change of state of the Night-time Set Point enable contact must remain stable at least for 10 seconds before startingthe commutation sequence.

At the moment of the Day-time/Night-time commutation:1. The compressors are turned off 2. The NO12 outlet ( Slave address 2 ) is deactivated3. The NO13 outlet ( Slave address 2 ) is activated4. After the delay set by the compressors by pass switch on the compressors are enabled to restart, if requested.

At the moment of the Night-time/ Day-time commutation:1. Compressors are turned off 2. The NO13 outlet ( Slave address 2 ) is deactivated3. The NO12 outlet ( Slave address 2 ) is activated4. After the delay dictated by the Compressors by pass switch on the compressors are enabled to restart, if re-

quested.

During the Night-time operation the capacity step functions must not be managed ( Except at the compressors start), if

these capacity step functions are set as present, in Night-time operation are declared absent by the system.

WARNING: If the PUMP DOWN is enabled, the parameter compressor switch on by pass must be set to a value atleast double than the Pump down maximum time parameter.


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19.1 SETTING THE TIME BA NDS

For example, assuming time bands with the following values:

TIME SETP RESULT

06:00 13C From 06:00 to 09:00 the set point = 13C09:00 12C From 09:00 to 17:00 the set point = 12C17:00 13C From 17:00 to 21:00 the set point = 13C21:00 14C From 21:00 to 06:00 the set point = 14C

1112131415

6.00 9.00 17.00 21.00Four time bands can be set, and if one or more of these is not used, it is important to attribute them the same value as

the set-point of the previous time band. It is also possible to set timed or daily on and off times, for example: on at 06:00 and off at 20:00 on Monday and off Saturday.


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20.0 PUMP DOWN MANAGEMENT (Starting from the 3.502 software version)

In order to activate the pump down function, the following screen of the Manufacturer menu compressors submenu,must be correctly set. NB: The value of the Maximum Pump-Down Time parameter depends on the compressor typeand/or the operation parameters of the unit: Call Clivet technical department for supplementary information.

Manufacturer menu5 Pump Down Enable YES

Maximum Pump-Down Time Seconds

The pump down function is active both at the starting and at the stop of the compressor. The pump down controlis obtained with the same pressure switch controlling the low pressure.

Pump Down at the compressor starting :- When the compressor start is requested, the Low Pressure alarm delay timer is activated by the thermoregula-

tor,- the solenoid valve on the liquid line is activated, the system waits that the low pressure switch closes the contact.

(if a Low Pressure status persists over the time set on the Low Pressure alarm delay parameter the Low Pres-sure alarm is tripped).

- As soon as the pressure switch contact closes, the compressor is started, the Pump-Down Maximum Time is acti-vated and the valve on the liquid line is closed.

- As soon as the contact of the Low Pressure switch opens, the valve opens again. ( if more time than the value setin Pump-Down Maximum Time parameter will pass unless that the pressure switch opens, the valve on the liq-uid line corresponding to the compressor is in any case immediately energised ).

- After this stage the low pressure alarm is instantaneous.

Pump Down at the stop:- When the compressor stop is requested, the Maximum Pump-Down Time timer starts its countdown and the

valve on the liquid line is closed. As soon as the pressure switch opens the contact, the compressor is turned off. (if more time than the Pump-Down Maximum Time passes unless the pressure switch opens, the compressor isin any case turned off.

WARNING:

THE PUMP DOWN FUNCTION MUST NOT BE ACTIVATED INTHE REVERSIBLE UNITS


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21.0 THERMOREGULATOR OPERATION

In Clivet units, the regulator must be set as proportional only , and the control probe must be the water tem-perature probe at the evaporator inlet. The dead zone of temperature regulation must normally be set at the 0Cvalue.

User Menu5 Temperature regulation dead zone: 0.0C

Control probe: Inlet21 Type of temperature control P

Integration time for P+I control 600 seconds

When the Set Point, the Operation band, the number of compressors and capacity steps are correctly set, the thermo-regulator automatically sets the intervention points of the available power steps. See the following diagrams:THERMOREGULATOR IN SUMMER OPERATION CYCLEThe example is related to a 4 power steps unit .

Return water temperature

Working bandControl dead zone

step 3step 2 step 4step 1

+

SUMMER Set Point

THERMOREGULATOR IN WINTER OPERATION CYCLEThe example is related to a 4 power steps unit .

Return water temperature

Working band Control dead zone

step 2step 3step 4 step 1

WINTER Set Point

+

Once fixed the thermoregulator operation, the Set Point ( summer or winter ) must be set at the wanted water temperature. In the following page there are two exemplifying diagrams.


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Example 1 : 4 capacity step unit in cooling operationSummer Set Point = 7C

Proportional band = 2CRegulation dead zone= 0C

EXAMPLE OF THERMOREGULATOR SUMMER OPERATION

0

1

2

3

4

5

6

7

8

9

10

11

Time

Included stepsInlet temperatureOutlet temperature

8,5C

8,0C7,5C

7,0C

8,5C8,0C

7,5C8,0C

8,5C9,0C

T e m p e r a

t u r e

/ s t e p s

Example 2 : 4 capacity step unit in heating operationWinter Set Point = 40CProportional band= 2CRegulation dead zone= 0C

EXAMPLE OF THERMOREGULATOR WINTER OPERATION.

02468

10121416182022242628303234363840424446

Time

Active stepsInlet temperatureOutlet temperature

3 8,5 C 39 ,0C 39,5C 40,0C 39,5C 39,0C 38,5C 38,0C 38,5C

T e m p e r a

t u r e

/ s t e p s


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22.0 SET-POINT COMPENSATION

This function is available starting from the version 50- of the software. There are two possibilities:

1) Set-point compensation according to the reading of an external temperature probe connected to the Pco.2) Set-point compensation according to an analogue signal of 4/20mA.

In the first case, the microprocessor software is already prearranged with all configuration parameters needed to drawthe set-point variation diagram according to the outdoor temperature. Moreover, there is a digital input (which can beconnected to a remote controller) for enabling this function. There is the possibility to enable this compensation in coolingand heating, or cooling only and heating only. As a matter of fact the parameters are duplicated in order to have separatecontrols.In the second case, the compensation is made on the basis of an analogue signal produced by an external generator tobe provided by the customer. There are three configuration parameters to assign the max. set-point offset, and the inputsignal correct values to assign the minimum and maximum re-set. These parameters are common both to cooling andheating operation. Besides, also in this case it is possible to enable or inhibit this function separately in cooling and inheating.

22.1 SET-POINT COMPENSATION ACCORDING TO THE READING OF AN EXTERNALTEMPERATURE PROBE

The function CLIMATIC CONTROL allows the automatic temperature control of the handled media (water or air) accord-ing to the outdoor temperature.The user can therefore optimise the set point compensation diagram by modifying some special parameters.

22.1.1 CONFIGURATION OF THE OPERATING MODE

HEATING MODEThe following procedure represents the correct sequence to set the relevant parameters:- What is the maximum winter supposed outdoor temperature in the installation zone? Enter this value as Maxi-

mum outdoor w inter temperature - What is the minimum winter supposed outdoor temperature in the installation zone? Enter this value as Minimum

outdoor winter temperature - What is the required set-point when the outdoor temperature is at its maximum? Enter this value as Minimum off-

set winter set-point

- What is the required set-point when the outdoor temperature is at its minimum? Enter this value as Maximum offset winter set-point

In this way the thermoregulator will calculate the correct unit set-point according to the outdoor temperature.The diagram below sums up the thermoregulator operation:

Set-point compensation during winter operation

37,00

39,00

41,00

43,00

45,00

47,00

49,00

- 3 2 - 3 0 - 2 8 - 2 6 - 2 4 - 2 2 - 2 0 - 1 8 - 1 6 - 1 4 - 1 2 - 1 0 - 8 - 6 - 4 - 2 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 2 0 2 2

Outdoor temperature

Min. outdoor winter temperature = -30C



Min. outdoor winter temperature = 0C

Minimum off-set winter set-point = 38CMaximum off-set winter set-point = 48CMaximum outdoor winter temperature = 20C

PARAMETERS:

C a

l c u

l a t e d s e

t p o

i n t


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COOLING MODEThe following procedure represents the correct sequence to set the relevant parameters:- What is the maximum summer outdoor temperature supposed in the installation zone? Enter this value as Maxi-

mum outdoor summ er temperature - What is the minimum summer outdoor temperature supposed in the installation zone? Enter this value as Mini-

mum outdoor summ er temperature - What is the required set-point when the outdoor temperature is at its maximum? Enter this value as Minimum off-

set summ er set -point - What is the required set-point when the outdoor temperature is at its minimum? Enter this value as Maximum off-

set summ er set -point In this way the thermoregulator will calculate the correct unit set-point according to the outdoor temperature.The diagram below synthesises the thermoregulator operation:

25 24 23 22 21 20

Set-point compensation during summer operation

5,00

6,00

7,00

8,00

9,00

10,00

11,00

52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26

Outdoor temperature

C a

l c u

l a t e d s e

t - p o

i n t

Minimum off-set summer set-point = 6CMaximum off-set summer set-point = 10CMinimum outdoor temperature in = 20Csummer

PARAMETERS:

Max outdoor summer temp. = 25C

Max outdoor summer temp. = 30C

Max outdoor summer temp. = 40CMax outdoor summer temp. = 50C

USED PARAMETERS

MMEE NNUU SUB-MENU PARAMETER limits default MANUFACTURER

UNIT CONFIGURATIONCompensation enablingSUMMER:WINTER:

YES / NOYES / NO

NONO

Compensation by - external probe- signal 4-20mA

External probe

USERS MENUlimits default

Outdoor temperature limits for summer compensationMinimum:Maximum:

10C / +40C10C / +60C

20C40C

Summer compensation set-point limitsMinimum:Maximum:

-20C / +10C10C / +21C

6C10C

Outdoor temperature limits for winter compensationMinimum:Maximum:

-40C / +10C10C / +30C

20C40C

Winter compensation set-point limitsMinimum:Maximum:

22C / +45C22C / +51C

35C45C


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22.1.2 CALCULATION OF THE SUMMER AND WINTER COMPENSATED SET-POINT

Equations:

mp.outdoor temin.W.-mp.outdoor temax.W. p.-setW.Min.- p.-setW.Max.*mp.)outdoor te-temp.max.outdoor(W. p.-setW.Min. point-setdcompensateW. +=

In detail:Winter compensated set-p. is the resultWinter min. set-p. is the new parameter Winter min. compensated set-p.Winter max. set-p. is the new parameter Winter max. compensated set-p.Winter. max. outdoor temp. is the new parameter Max. winter outdoor temperatureWinter. min. outdoor temp. is the new parameter Min. winter outdoor temperatureOutdoor temperature is the outdoor temperature read by B6

( )mp.outdoor te-minS.mp.outdoor temax.S.

p.-setS.Min. p.-setS.Max.*mpoutdoor tetempmax.outdoorS. p.-setS.Min. point-setdcompensateS.

+=

In detail:Summer compensated set-p. is the resultSummer min. set-p. is the new parameter Summer min. compensated set-p.Summer max. set-p. is the new parameter Summer max. compensated set-p.Summer. max. outdoor temp. is the new parameter Max. summer outdoor temperatureSummer. min. outdoor temp. is the new parameter Min. summer outdoor temperatureOutdoor temperature is the outdoor temperature read by B6

Obviously, the max. calculated set-point cannot exceed the fixed limits set on Summer (or Winter) max. compensated set-point , according to the actual operating mode. Similarly, it cannot be minor than Summer (or Winter) min. compen-sated set-point , according to the actual operating mode.

IMPORTANT:DURING THE PROGRAMMING, IF ONLY THE WINTER COMPENSATION IS REQUIRED, IT IS INDISPENSABLE ,TO SET THE UNIT INTO HEATING MODE BY PRESSING THE RELEVANT KEY FOR FEW SECONDS UNTIL THEHEATING LED IS LIT ON. THIS OPERATION MUST BE PERFORMED ONCE CARRIED OUT THE UNIT

INITIALISATION AND BEFORE STARTING ANY PARAMETER MODIFICATIONS.

22.1.3 CONTROL FLOWCHART

Operatingmode

Enabled summer compensation

SUMMER

Yes

ExternalTemperature

Reading

BT6 probeavailable

Noalarm signal

Yes

No

Compensated set-point

Calculation

Unit set-point =Summer set-point

Unit set-point =Summer compensated

Set.point

Enabled winter compensation

WINTER

BT6 probe Available

alarm signal

ExternalTemperature

Reading

Yes

Yes

No

No

Unit set-point =Winter compensated

set-poino

Unit set-point =Winter set-point

Display unit set-point Display unit set-point

Enabled input B8

Yes

No Enabled input B8

Yes

No


Calculation


Calculation


Calculation


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22.1.4 ENABLING DIGITAL INPUT

The CLIMATIC CONTROL can be inhibited through a digital input (B8) found on the microprocessor MASTER printedboard besides the relevant parameters found on the MANUFACTURER \ UNIT CONFIGURATION menu.

When the contact in series to the digital input is open, the function is inhibited while it is enabled when the contact isclosed. When the function is inhibited, the standard set-points are enabled.

J1

B8 + 2 4 V d c

B7 B6 B5 A V S S J7 SERIAL

J2

J15

123

R14,7K

SA1

PCO MASTER

BT6

+ T M

J293 2 1

TO BE MADE BY THE CUSTOMER

Active probe for outdoor temperature code C511090 7

Optional compensationenabling switch. If notinstalled, the terminalsmust be short-circuited


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22.2 SET-POINT COMPENSATION THROUG H A 4-20mA SIGNAL

The set-point reset function is made on the basis of an external signal (4-20mA) on the analogue input B8. The objectiveis to adapt the handled media (air or water) set-point to the installation need through an external controller to be suppliedby the customer.

22.2.1.OPERATING MODE CONFIGURATION (HEATING AND/OR COOLING MODE)

1) The signal variation is directly proportional to the reset:

Lets suppose that the signal generated by the controller by the customer requires an increasing of the reset of 0,0C at 4,0mA and 10C at 20mA.

If the parameters have been set in the following way:Unit summer set-point = 7CUnit winter set-point = 40C,

by entering:Set-point reset, min. corr. = 4mASet-point reset, max. corr. = 20mASet-point reset, max. reset = 10C

we will obtain the following diagrams:

COOLING modeReset directly proportional to the signal

Curve of the compensated set-point in heating mode

0

5

10

15

20

25

30

35

40

45

1 , 5 2 , 5 3 , 5 4 , 5 5 , 5 6 , 5 7 , 5 8 , 5 9 , 5 1 0 , 5

1 1 , 5

1 2 , 5

1 3 , 5

1 4 , 5

1 5 , 5

1 6 , 5

1 7 , 5

1 8 , 5

1 9 , 5

2 0 , 5

2 1 , 5

2 2 , 5

Segnale 4-20mA

Reset MINIMO

Reset MASSIMO

Curva di variazione del Set Point Macchina

Reset directly proportional to the signalCurve of the compensated set-point in cooling mode

0

2

4

6

8

10

12

14

16

18

1 , 5 2 , 5 3 , 5 4 , 5 5 , 5 6 , 5 7 , 5 8 ,

Clivet Carel Pco

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