Manual pCoOEM Bicircuit - Rhoss

Electronic board 

PCO-OEM twin circuit 

USER MANUAL 

Rhoss S.p.A. S.A.T. 

Rev. 1.0 20/01/05 1

Summary / Contents 

1 Introduction 6 

2 Inlet outlet list 7 

2.1 Digital outlets 7 

2.2 Analogic outlets 7 

2.3 Digital inlets 7 

2.4 Analogic inlets 7 

2.5 Considerations 8 

2.6 Inlets configurations and digital outlets 8 

2.7 B4 multyfunction analogic enter 8 

3 On – Off and Unit state 10 

3.1 On - Off 10 

3.1.1 Used inlets 10 

3.1.2 Used parameters 10 

3.1.3 Working descriptions 10 

3.2 Unit state 10 

4 Main circulation pump management 11 

4.1 On/Off Main/s pump/s 11 


4.1.2 Used outlets 11 

4.1.3 Working description 11 

4.2 Working forcing of the main circulation pump 12 

4.3 Second pump management 13 

4.4 Pump/s management in case of water flow alarm 13 




4.4.4 Working description with single pump 13 

4.4.5 Working description with double pump 13 

5 Thermoregolation 15 

5.1 Summer/winter commutation 15 





5.2 Setpoint set up 16 




Rev. 1.0 20/01/05 2

5.3 Control setpoint compensation 16 




5.4 Request calculation of air/water units 18 




5.5 Working description 18 

5.5.1 Temperature regolation in chiller modality 18 

6 Compressors 22 

6.1 Refrigerating circuit types 22 

6.2 Safety delay times 22 

6.2.1 Turn off minimum time 22 

6.2.2 Tme between starting times of the same compressor 22 

6.2.3 Working minimum time 22 

6.2.4 Time between starting times of different compressors / Time 

between turn offs of different compressors 22 

6.3 Rotation 23 

7 Condensation control/Evaporation 24 





7.2.1 Chiller working 25 

7.2.2 Pre-ventilation 25 

7.2.3 Post-ventilation 26 

7.2.4 Heat pump working 26 

7.2.5 Pre-alarm of high temperature/pressure 26 

8 Defrost 28 





8.3 defrost typology 30 

8.3.1 Contemporary 30 

8.3.2 Separated 30 

8.4 Compressors and dripping 31 

8.5 Fan and Condensation 32 

8.6 Low pressure alarm from pressure switch 32 


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9 Time bends 33 

10 Devices contactor 34 




11 Alarms 35 

11.1 Display - Reset 35 

11.2 Alarm log 35 

1.1 Alarm table 36 

11.3 Antifreezing management 40 





11.4 Flow alarm management 41 





11.5 Empty unit warnig signal 41 





11.6 Phase controller 42 





12 Users interface and parameters 44 

12.1 Autoconfiguration of the users interface 44 

12.2 PGD lay-out 44 

12.2.1 LED signalling 44 

12.2.2 Keys utilization 44 

12.3 Password definition of protected branches access 45 

12.4 Set up parameters list 45 

13 Supervisor 57 

13.1 Variables: Digital - Whole - Analogic 57 

13.2 Variables database for LonMark protocol 62 


Rev. 1.0 20/01/05 4

13.2.1 Digital variables 63 

13.2.2 Analogic variables 63 


Rev. 1.0 20/01/05 5

1 INTRODUCTION 

This software personalised for Rhoss S.p.A. will proceed at the control and regulation of 

single/twin/fourth-compressor chiller units, single/twin-circuit; with the possibility to work in chiller 

modality or heat pump, by a pCOEM for the management of Rhoss personalised double-circuit. 

The software will include the following characteristics: 

• Chiller + heat pump 

• Air/water 

• Single/twin/fourth-compressor 

• Single/twin-circuit 

• Pump/s control of main circulation 

• Pressure condensation control of 1 or 2 fan rows 

• Management of the contemporary and separated defrost in temperature/pressure 

• System and circuit alarm 

• Alarm log 

• Communication to the serial supervisor system 

We provide the use of a PGDO remote keyboard, with a Rhoss personalised keyboard. 


Rev. 1.0 20/01/05 6

2 INLET OUTLET LIST 

Is provided the management of different types of unit. 

The selection takes place for the combination of four parameters of set up: 

• number of installed compressors 1-2-4 

• number of refrigerating circuits 1-2 

• type of condensation Air/water 

• way of unit working Chiller – Heat Pump 

2.1 Digital outlets 

Device Code Reference for EasyTools 

Compressor 1 J3A/B Digital output 1 peg (like for single circuit) 

Compressor 2 J4A/B Digital output 2 peg (like for single circuit) 

Compressor 1 J5A/B Digital output 1 PECO address 0 

Compressor 2 J6A/B Digital output 2 PECO address 0 

Fan circ-1 J7 Digital output 3 peg (like for single circuit) 

Pump 1 J8 Digital output 4 peg (like for single circuit) 

Evaporator electrical heater J9 Digital output 5 peg (like for single circuit) 

Pump 2 / Recovery valve J10 Digital output 6 peg (like for single circuit) 

Cycle inversion valve circ-1 J11 Digital output 7 peg (like for single circuit) 

Fan circ-2 J12 Digital output 3 PECO address 0 

Cycle inversion valve circ-2 J13 Digital output 4 PECO address 0 

Alarm J14 Digital output 8 peg (like for single circuit) 

2.2 Analogue outlets 

Device Code reference for EasyTools 

Fan circ-1 Y1 Analogue output 1 pGE conf. 0/10V 

Fan circ-2 Y2 Analogue output 2 pGE conf. 0/10V 

2.3 Digital inlets 


High pressure switch circ-1 ID1 Digital outlet 8 pGE (like for single circuit) 

Thermal protector for compressor 1 ID2 Digital outlet 5 pGE (like for single circuit) 

Thermal protector for compressor 1 ID3 Digital outlet 1 pGE (like for single circuit) 

Fan thermal protector ID4 Digital outlet 2 pGE (like for single circuit) 

Low pressure switch circ-1 ID5 Digital outlet 3 pGE (like for single circuit) 

Differential pressure switch ID6 Digital outlet 4 pGE (like for single circuit) 

Summer/Winter selector ID7 Digital outlet 6 pGE (like for single circuit) 

Remote control selector ID8 Digital outlet 7 pGE (like for single circuit) 

High pressure switch circ-2 ID9 Digital outlet 1 pCOE address 0 

Thermal protector for compressor 3 ID10 Digital outlet 2 pCOE address 0 

Thermal protector for compressor 4 ID11 Digital outlet 3 pCOE address 0 

Low pressure switch circ-2 ID12 Digital outlet 4 pCOE address 0 

2.4 Analogues inlets 


Water inlet temperature B1 pGE B1 conf. NTC (like for single circuit) 

Water outlet temperature circ-1 B2 pGE B2 conf. NTC (like for single circuit) 


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Defrost temperature circ-1 B3 pGE B3 conf. NTC (like for single circuit) 

Recovery temperature 1 / Outside air B4 pGE B4 conf. NTC (like for single circuit) 

temperature 

Recovery temperature 2 B5 pGE B5 conf. NTC (like for single circuit) 

Condenser pressure circ-1 B6 pGE B6 conf. 0-5V (like for single circuit) 

Water outlet temperature circ-2 B7 pGE B7 conf. NTC 

Defrost temperature circ-2 B8 pGE B8 conf. NTC 

Condenser pressure circ-2 B9 PCOE address 0 B1 conf. 0-5V 

2.5 Considerations 

The way of working decided for the digital inlets (except the remote On/Off inlet) provides the high 

logic state (1) in case of opened contact, like already did for all the applications on any Carel 

hardware. 

At the qualification of the pressure transducer the software will automatically proceed at the 

following operations: 

• disqualification of the analogue inlet, related to the condensing coil temperature 

• control of the defrost process according to the pressure values of condensation instead of the 

temperature of the condensing coil. 

The disconnection of the pressure trasductor will involve the automatic return at working in 

temperature of all the interested functions and if qualified, at the exclusion of the proportional 

control of condensation. 

2.6 Digital inlets/outlets Configuration 

To allow the interface dialogue of the system with different nature devices, among the 

manufacturer parameters, protected by specific passwords, are provided with set up parameters of 

the working modality of the inlets and the digital outlets. 

They can be clearly set up, the working logic of each inlet or outlet, on the main card according to 

the following correspondences: 

Digital inlets 

N.C. during the normal working of the unit the contact is closed (logic state 0), the contact 

opening, involves an action from the program (logic state 1) 

N.O. during the normal working of the unit the contact is opened (logic state 0), the contact 

closing, involves an action from the program (logic state 1) 

Digital outlets 

N.C. the activation of a loading connected to the card pCO1OEM is caused from a closing of an 

associated contact (references to the inlet/outlet tables) 

N.O. the activation of a loading connected to the card pCO1OEM is caused from an opening of an 

associated contact (references to the inlet/outlet tables) 

2.7 B4 multifunction analogue inlet 

The management of the B4 analogue inlet provides distinct modalities if is qualified or no, the heat 

recovery function and the compensation of the adjusting setpoint based on the values of the 

outside temperature. 

The following table summarises the correspondences between the analogue inlet functionality and 

particular unit enabled functions. 


Rev. 1.0 20/01/05 8

Heat 

qualification 

X 

recovery 

Setpoint compensation 

qualification 

Water temperature 

probe of recovery coil 

inlet 

B4 

Outside 

temperature probe 

X 

B4 

X X Not provided unit configuration (in any case 

priority at the heat recovery) 

air 

As you see with disqualified recovery, the B4 analogue inlet can be used for read the temperature 

of the outdoor air, with the purpose of the setpoint compensation of the unit regulation. 

If the heat recovery function is qualified, having this more priority, will imply the use of the same 

inlet for the reading of the inlet water temperature at the recovery coil. 


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3 ON – OFF AND UNIT STATE 

3.1 On - Off 

3.1.1 Used inlets 

• Remote On/Off contact 

3.1.2 Used parameters 

• On/Off qualification from a remote supervisor 

• On/Off control from keyboard 

• Logic configuration of the 8 digital inlet working 

3.1.3 Working description 

The switch-on or switch-off of the unit is possible in three distinct ways, differentiated each other 

from a different priority grade: 

1. Keyboard 

2. Digital inlet 

3. Supervisor 

The keyboard has the main priority, only if switched on from keyboard; the unit can be afterwards 

switched-off/switched-on from a digital inlet or supervisor. 

The switch-on or switch-off of the keyboard unit will occur by pressing down the key [On/Off] for 2 

seconds in case of use of the PGD user interface terminal. 

Switch-on or switch-off from digital inlet has lower priority than the keyboard control, but higher 

than the supervisor. 

Switch-on or switch-off from supervisor is an actionable function. 

Each of the three interventions produces a specific message in the main menu mask that identifies 

the exact situation of the unit working. 

For what concern the working modality of the digital inlet will depend from the manufacturer 

parameter set-up of the working logic set-up of the digital specific inlet 

For what concern the supervisor, the expected working logic means: 

High logic state (1) unit on 

Low logic state (0) unit off 

3.2 Unit condition 

It’s provided the visualisation of the exact working state of the unit by an appropriate inscription 

reproduced in the main menu mask: 

On” 

“Off by alarm” 

“Off by supervisor” 

“Off by Digital inlet ” 

“Off by Keyboard ” 

The stand by status is the situation when ,with the unit in ‘’on’’,all the devices are off after the reach 

of the set point. 

If you’re using the PST user interface the unit in is signalled by the display of the regulation set 

point. 

The status of unit off ,but correctly supplied, is signalled by the led og the decimal point on,with all 

the display digit off;the alarm status will be signalled by the alarm red led lighting. 


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4 MAIN CIRCULATION PUMP MANAGEMENT 

4.1 Switch-on/Switch-off main/s pump/s 


• Selection of the working mode of the main circulation pump 

• Pump-compressors delay switch-on time 

• Pump-compressors delay switch-off time 

• Number of pumps 

• Rotation time among pumps 

• Pump rotation test 

• Rotation time among test pumps 

• Working mode 

4.1.2 Used outlets 

• Main circulation pump 1 

• Main circulation pump 2 


Everything will be said after, is worth for both pumps, if is not differently specified. 

The second pump can be activated instead of the recovery outlet. 

The pump can be configured to work in two different modes by the manufacturer’s parameter 

protected by a password: 

• continuous working 

• working after the electronic control call (compressor) 

4.1.3.1 Continuous working 

The pump is active during all the working time. 

There will be managed: a delay time at the activation of the devices from the unit switch-on 

(therefore the pump), and a delay time of the pump switch-off from the unit switch-off. 


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4.1.3.2 Working over electronic control’s call 

Normally, when the setpoint is reached, the pump is switched-off; as soon as a thermostatic 

request appears, the pump is immediately switched-on and only after the delay time at the 

activation of the devices the requested hot/cold capacity steps are activated. 

At the end of the thermostatic request the hot/cold devices are switched-off, and only after the 

delay time at the set up pump switching-off , is stopped. 

In case of defrost, during the stages when the compressor is switched-off by refrigerating cycle 

inversion, the pump remains switched-on. 

TERM 

ON 

OFF 

Time 

COMPR 

ON 

OFF 

Time 

WP 

ON 

OFF 

Pa P02 

Pa P03 

Time 

TERM Electronic control 

WP Main circulation pump 

P02 Compressors-pump switch-on delay 

COMPR Compressors conditions 

Time Time 

P03 Pump-compressors switch-off delay 

4.2 Main circulation pump working forcing 

Exist some working situations that forcing the switch-on main circulation pump is necessary: 

• After an antifreeze electrical heater intervention 

• After an antifreeze protection intervention 


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4.3 Second pump management 

The second pump can be enabled instead of the recovery outlet. 

The qualification comes by a special parameter given from the manufacturer menu. 

If the second pump is qualified, in the “Pump” menu you will find the parameters to manage the 

rotation and the pumps working mode: 

In fact is provided that after a certain number of settable hours (cumulative) happens the pumps 

rotation. During the passage from each other pump the compressors are stopped and before 

restart it must spend a certain “Compressors-pump switching-on delay time”. 

It’s possible qualify the rotation test among the pumps (in minutes). 

A further parameter fixes the working time of the pumps: 

o automatic (the time rotation is managed); 

o only pump 1 (the pump 1 will be always forced); 

o only pump 2 (the pump 2 will be always forced). 

As well as by time, the pumps will rotate even in case of relief of water flow lack. 

4.4 Pump/s management in case of water flow alarm 


• Digital inlet of the differential pressure switch of the evaporator water. 


• Number of maximum consecutive interventions per pump of the flow alarm. 


• Main 1 circulation pump 

• Main 2 circulation pump 

4.4.4 Working description with single pump 

In case of water flow alarm, relieved from the differential pressure switch fixed on the evaporator, 

the pump working will depend from the reset time of the alarm. 

It’s managed a maximum number of water flow alarm with consecutive manual reset, witch, over 

that the alarm works with manual reset. 

The counting is settable in “factory” menu->Alarm menu is reset every time the pump works 

continuously for at least a time of: 

Flow alarm delay at the start-up of the pump (def.10sec) + running flow alarm delay(def.3sec) + 5 

set seconds. 

With automatic reset alarm the pump keeps running in spite of the alarm condition, will be reset the 

by-pass time of the alarm repeating the cycle up to the reattachment of the maximum number of 

the repeating alarms. 

With the manual reset the pump will be switched-off until the reset of keyboard condition by a 

special key. 

4.4.5 Working description with double pump 

In case of water flow alarm, relived from the differential pressure switch fixed on the evaporator, 

the working of the pumps will depend from the alarm-reset type. 

It’s managed a maximum number of water flow alarm with consecutive automatic reset for each 

pump, witch, over that the alarm works with manual reset. 

The counting settable in “Factory” menu -> Alarm menu is reset every time the pump is 

continuously working for at least a time of: 

Flow alarm delay at the start-up of the pump (def.10sec) + running flow alarm delay (def.3sec) + 5 

set seconds. 

Every time a alarm starts, will be forced a rotation among the pumps, with following switching-off of 

the compressors (if switched-on), and reset of the alarm by-pass times repeating the cycle until 


Rev. 1.0 20/01/05 13

one of the two pumps won’t give the OK flow signal, or until the reaching of the maximum number 

of repetitive alarms per pump. 

With manual reset the pump/s will be switched-off until the reset of the keyboard condition by 

special key. 

So there are 2 distinct alarms: 

o pump alarm 1 damaged 

o pump alarm 2 damaged 


Rev. 1.0 20/01/05 14

5 THERMOREGULATION 

5.1 Summer/winter commutation 


• Digital inlets summer/winter commutation 


• Qualification at the summer/winter commutation from digital inlet. 

• Qualification at the summer/winter commutation from supervisor. 

• Summer/winter commutation from keyboard. 

• Logic configuration of the 7 digital inlet working (Summer/winter selection) 

• Logic configuration of the 9 digital outlet working (4way valve refrigerating cycle inversion) 


• Refrigerating cycle inversion valve 


As the control of the heat pump+chiller unit is provided, the commutation process of the 

summer/winter working will be managed. 

The selection can be done: 

o From keyboard: always active on the CH/HP units. From the main mask by a long pressing of 

the Mode/Enter key of the PGD. 

o From digital outlet: If the process is qualified (menu “Rem.Summer/Winter”), by the digital7 

inlet. The logic (N.C./N.O.) decided for the selection digital inlet of the chiller mode or heat 

pump will depend from the set up of the relative manufacturer parameter. 

Inlet logic State Meaning 

NO 

Open Winter 

Close Summer 

NC 

Open Summer 

Close Winter 

The working logic (N.C./N.O.) decided for the digital outlet, related at the inversion valves of 

the refrigerating cycle, will depend from the set up of the related manufacturer’s parameter. 

The real working state is sent to the supervision system by an opportune variable, while, on 

board unit by an opportune visualisation in the setpoint masks and in the main menu. 

o From remote to supervisor: If the process (”User” menu) is activated by the digital variable 

with address 1. 

At each condition is given a priority: the selection by keyboard and from supervisor has the same 

priority, while if is qualified the digital inlet control has priority on everything. In any case the 

supervisor will always report the correct working way of the unit. 

If the commutation of the working mode of the unit is requested, every device will be switched-off 

and after a set delay of 3 seconds from the switch-off, the refrigerating cycle inversion will be 

operated; 2 seconds after the refrigerating cycle inversion, the devices control will be reactivated, 

witch can be re-switched-on after the set up safety timings are satisfied. 

The working mode (N.C./N.O.) decided for the digital outlet, related at the inversion valves of the 

refrigerating cycle, will depend from the set-up of the related manufacturer’s parameter. 

The effective state of working is sent at the supervision system, while onboard unit by an 

opportune visualisation in the main mask. 


Rev. 1.0 20/01/05 15

5.2 Setpoint set-up 


• Summer regulation setpoint 

• Winter regulation setpoint 

• Lower limit of the summer setpoint set-up 

• Higher limit of the summer setpoint set-up 

• Lower limit of the winter setpoint set-up. 

• Higher limit of the winter setpoint set-up. 


The thermostatic regulation of the unit is based on two distinct regulation setpoint: 

o Summer regulation setpoint (chiller) 

o Winter regulation setpoint (heat pump). 

Those values will be settable in one of the setpoint masks. The limits of both setpoint will be 

adjustable from user mask, dedicated and protected from password. 

5.3 Compensation of the setpoint regulation 


• inlet of the outdoor air temperature 




• Qualification of the Setpoint compensation 

• Offset compensation of the summer setpoint 

• Offset compensation of the winter setpoint 

• Outdoor threshold temperature for summer setpoint compensation 

• Outdoor threshold temperature for winter setpoint compensation 

• Outdoor temperature delta for summer setpoint compensation 

• Outdoor temperature delta for winter setpoint compensation 


In order to an energetic conservation and the possibility of working of the unit with particular heavy 

temperatures is provided a chance to change the regulation setpoint automatically, according to 

the temperature conditions of the outdoor air. 

If qualified, the compensation function of the setpoint will work out the algebraic addition the set-up 

setpoint value and the calculated value in order of the outdoor air temperature according to the 

modality of unit working. 


Rev. 1.0 20/01/05 16

Positive offset 

OFFSETC 

HEAT PUMP 

WORKING 

STE 

CHILLER 

WORKING 

OFFSETHP 

DELTA_H0 

TE[°C] 

STE 

DELTA_H 

DELTA_C 

OFFSETC 

OFFSETHP 

TE 

Outdoor temperature setpoint (distinct for chiller working or heat pump) 

Temperature delta in heat pump mode 

Temperature delta in chiller mode 

Offset set point in chiller mode 

Offset setpoint in heat pump mode 

Outdoor air temperature 

Negative offset 

HEAT PUMP CHILLER 

WORKING 

STE 

WORKING 

TE[°C] 

OFFSETHP 

OFFSETC 

DELTA_H0 

STE 

DELTA_H 

DELTA_C 

OFFSETC 

OFFSETHP 

TE 

Outdoor temperature setpoint (distinct for chiller mode or heat pump) 

Temperature delta in heat pump mode 

Temperature delta in chiller mode 

Offset set point in chiller mode 

Offset setpoint in heat pump mode 

Outdoor air temperature 

The value of the temperature offset for the definition of the compensation of the regulation setpoint 

can be set up, clearly for winter or summer mode, with positive or negative values, producing then, 

the increase or decrease of the regulation setpoint, according to the particular requirements. 


Rev. 1.0 20/01/05 17

5.4 Calculation of the request in air/water units 


• Water temperature analogue inlet, evaporator-condenser inlet 

• Digital inlet of summer/winter commutation. 




• Temperature regulation band 

• Unit selection air/water type 


• All the outlets reserved at the compressors 

5.5 Working description 

The calculation of the thermostatic request of the unit is based on a control of proportional type 

with lateral band, based on the temperature measure of the inlet water to the evaporator/ 

condenser coil. If the unit is in chiller mode or heat pump the regulation band will be fixed at the 

right or left of the setpoint respectively. 

5.5.1 Temperature regulation in chiller mode 

Regulation example of the temperature in single-compressor units 

PWR 

STEP1 

STPM 

EIWT[°C] 

BND 

PWR Integrated power 

STEP1 Power step 1 

STPM Main regulation setpoint 

BND Regulation band 

EIWT[°C] Evaporator inlet water temperature 

There are 2 possible ways of compressor management: grouped and equalised. For default is 

equalised. 

The selection is done by the “En.layer device” parameter in the “configuration menu”. 

Example 

of grouped regulation (En.layer device=N) in twin-circuit four-compressor units: 


Rev. 1.0 20/01/05 18

RBM 

S1 C1 S2 C1 S1 C2 S2 C2 

STPM 

EIWT [ºC] 

STPM Regulation setpoint 

RBM Regulation band 


S1 C1 Step 1 circuit 1 




Example of equalised regulation (En.layer device=Y) in twin-circuit four-compressor units: 

RBM 

S1 C1 S1 C2 S2 C1 S2 C2 

STPM 

EIWT [ºC] 









Rev. 1.0 20/01/05 19

5.5.1.1 Temperature regulation in heat pump modality 

Regulation example of the temperature in single-compressors units. 

PWR 

STEP1 

STPM 

EIWT[°C] 

BND 

PWR Integrated power 

STEP1 Power step 1 

STPM Main regulation setpoint 

BND Regulation band 


There are 2 possible ways of compressor management: grouped and equalised. For default is 

equalised. 

The selection is done by the “En.layer device” parameter in the “configuration menu”. 

Example of grouped regulation (En.layer device=N) in twin-circuit four-compressors units: 

RBM 

S2 C2 S1 C2 S2 C1 S1 C1 

STPM Setpoint regulation 


EIWT[°C] 

Evaporator inlet water temperature 





STPM 

EIWT [ºC] 

Example of equalised regulation (En.layer device=Y) in twin-circuit four-compressor units 


Rev. 1.0 20/01/05 20

RBM 

S2 C2 S2 C1 S1 C2 S1 C1 


RBM Regulation Band 






STPM 

EIWT [ºC] 


Rev. 1.0 20/01/05 21

6 COMPRESSORS 

6.1 Refrigerating circuit types 

The software can manage the following types of unit, all with the chance of working in chiller mode 

or heat pump: 

single-circuit – single-compressor 

single-circuit – twin-compressor 

twin-circuit – twin-compressor 

twin-circuit – four-compressor 

Tandem compressors configuration 

Tandem compressors configuration 

The compressors will be of hermetic type, without any chance of power modulation by choking 

steps. 

6.2 Safety delay times 

For each compressor will be managed some safety delay times with the purpose to protect the 

working of the device restricting the working to particular conditions given from the manufacturer of 

the same compressor. 

The managed times will be: 

1. switch-off minimum time 

2. minimum time among following switch-on of the same compressor 

3. minimum time of working 

4. time among switch-on of different compressors 

5. time among switch-off of different compressors 

6.2.1 Switch-off minimum time 

Between a switch-off and a switch-on of the same compressor a safety time must be respected. 

That time will be applied even at the return from blackout deactivating the thermostatic control, 

protecting the compressor from switch-off of not exact last. 

6.2.2 Time between starting times of the same compressor 

From a switch-on to the next must be respected a safety time with the purpose of guarantee the 

minimum number of starting times per hour of the compressor. 

Working minimum time 

After the switch-on a compressor must work for a minimum time same at the indicated time 

independently from the thermostatic request. 

The switch-off can be immediate after an alarm, delayed for a decrease of request with active time. 

6.2.3 Time among switch-on of different compressors / Time among 

switch-off off different compressors 

In twin/four-compressor units are applied two different safety times between the switch-on and 

switch-off of following compressors. 

The applied time among the switches-on avoids the electric circuit overloud caused by the 

possible contemporary switch-on of two devices (for example after an alarm). 

The applied time among the switches-off makes gradual the power decrease in the circuit, 

avoiding then swinging of the requests between switch-on and switch-off. 


Rev. 1.0 20/01/05 22

6.3 Rotation 

The compressor’s and time circuits are managed. 

First of all will be controlled the priority among the 2 circuits, then the priority among the 2 

compressors of that circuit. 

As previously said, in twin-circuit/four-compressor unit, are possible two kinds of compressor’s 

management: grouped and equalised. For default is equalised. 

The selection comes by the “En.layer device” parameter, in the “configuration menu”. 

Grouped: It always tries to bring a circuit at 100% before starting to switch-on the compressors 

from the other circuit. 

Equalised: the power is uniformly delivered among the 2 circuits. 


Rev. 1.0 20/01/05 23

7 CONDENSATION/EVAPORATION CONTROL 


• Circuit 1 condensation pressure analogue inlet 

• Circuit 2 condensation pressure analogue inlet 

• Fan thermal digital inlet 


• Kind of ventilation control 

• Number of ventilation groups 

• Condensation pressure setpoint 

• Minimum fan speed 

• Maximum fan speed 

• Speed-up time 

• Cut-off step hysteresis 

• Prevention threshold of high condensation pressure of “normal” working 

• Prevention hysteresis of high condensation pressure of “normal” working 

• Prevention threshold of high condensation temperature of “normal” working 

• Prevention hysteresis of high condensation temperature of “normal” working 

• Prevention threshold of high condensation pressure during defrost 

• Prevention hysteresis of high condensation pressure during defrost 

• Prevention threshold of high condensation temperature during defrost 

• Prevention hysteresis of high condensation temperature during defrost 

• Pre-ventilation qualification 

• Compressors activation delay for pre-ventilation 

• Post-ventilation activation after high pressure alarm by trasductor and pressure switch 

• Post-ventilation maximum time 


• Condensation fan control digital outlet of circuit 1 

• Condensation fan control digital outlet of circuit 2 

• Fan speed regulator 0-10V analogue outlet of circuit 1 

• Fan speed regulator 0-10V analogue outlet of circuit 2 


The condense control is based on a compressor working state or on a condense pressure 

trasductor writing, according to the pressure probe and the kind of set control: 

• On/Off fan directly driven by the digital outlet of the card 

• Speed variation fan driven by the PWM signal present at the analogue outlet of the card, 

proportional to the pressure 

It will decide if the device workings are whether or not bound at the Compressors State: 

• Bound working at the compressor state: independently from the thermostatic request of 

condensation: With switched-off compressor/s the fan/s will keep off. 

• Not bound working of the compressors state: independently from the working state of the 

compressor/s: the fan follows the pressure value of condensation. 

Without the pressure trasductor the software will drive On/Off fans, bound at the working conditions 

of the compressor: 

Switched-on compressor/s switched-on fan 

Switched-off compressor/s switched-off fan 


Rev. 1.0 20/01/05 24

If the 0÷5 Volt pressure trasductor is installed, will be possible choose the kind of On/Off ventilation 

control or proportional, according to the relieved pressure values. In the second case the On/Off 

digital outlet will be anyway driven in parallel. 

- If the unit has 1 ventilation group and both the pressure probe are qualified: 

So 

The highest pressure for the fan activation in summer working will be controlled 

The lowest pressure for the fan activation in winter working will be controlled 

- If the unit has 2 ventilation groups and just 1 qualified pressure probe (case possible only on 

contemporary defrost units) 

So 

Both ventilation groups will be controlled according to that pressure 

- If the unit has 2 ventilation groups and 2 qualified pressure probes 

Then, each group will work with his pressure probe 

The On/Off regulation is the same described before. 

The proportional regulation is lateral banded. A setpoint and a regulation band will be set-up, 

according to witch the power modulation will be driven. 

When the presence of the pressure trasductor is qualified, The condensation control will remain 

On/Off type. 

The qualification of the pressure probe and control type from terminal will be present in the same 

mask under the “Condensing control” menu. 

7.2.1 Chiller working 

CPRS Condensation pressure 

STPC Condensation setpoint 

RBC Condensation regulation band 

HCOFF Cut-off hysteresis steps 

MINV Minimum speed of the condensation fans 

MAXV Maximum speed of the condensation fans 

CFONOFF Condensation fan control from On-Off digital outlet 

CFPWM Condensation fan control from PWM analogic outlet 

7.2.2 Pre-ventilation 

THRICH 

CFS 

CMPS 

PVT 

T [s] 

THRICH Thermostatic request 

CFS Condensation fans state 

CMPS Compressors state 

PVT Pre-ventilation time 

T [s] Time 

The pre-ventilation function it’s possible activate it only in chiller working (parameter protected from 

manufacturer’s password), according to, after a thermostatic request, the condensation fans are 

switched-on sooner than the compressors. 


Rev. 1.0 20/01/05 25

The delay time at the activation of the pre-ventilation compressors is a settable parameter 

protected from specific user’s password. 

7.2.3 Post-ventilation 

The post-ventilation function it’s possible activate it only in chiller working (parameter protected 

from manufacturer’s password), according to, after a high pressure alarm (by pressure switch or 

trasductor), the fan of the related circuit will be activated at maximum capacity for a time settable 

from maintenance parameter , protected from specific password. 

7.2.4 Heat pump working 

RBC 

MAXV 

CFPWM 

MINV 

HCOFF 

CFONOFF 

STPC 

CPRS[bar] 

CPRS Condensation pressure 

STPC Condensation setpoint 


HCOFF Cut-off steps hysteresis 

MINV Condensation fans minimum speed 

MAXV Condensation fans maximum speed 

CFONOFF Condensation fan control from On-Off digital outlet 

CFPWM Condensation fan control from PWM analogue outlet 

The activation of a defrost cycle will cause the switch-off of the related fan group in heat pump 

mode. 

7.2.5 High temperature/pressure pre-alarm 

RBC 

HYST_P 

HYSTA_HP 

CPRS[bar] / TC[°C] 

STPC 

THR_P 

THRA_H 

STPC Condensation regulation setpoint 


THR_P High condensation prevention threshold 

HYST_P High condensation prevention hysteresis 

THRA_HP High condensation alarm threshold 

HYSTA_HP High condensation alarm hysteresis 

CPRS / TC Condensation Pressure/Temperature 

It’s possible activate a prevention function of high pressure/temperature of condensation, 

according to, after a threshold and an hysteresis are set-up, a fan activation step is checked, that 

will bring them at the maximum speed, with the purpose to prevent the intervention of the high 

condensation alarm, with following compressor’s switch-off. 


Rev. 1.0 20/01/05 26

Among the manufacturer’s parameters, protected from password, there is a configuration 

parameter of prevention 

control of high condensation according to, is possible activate the control 

of the unit only in “normal” working (management of the loads after the evaporator thermostatic 

request), in the only defrost phase or in both working situations. 

If the high condensing pressure prevention control during the defrost phase is activated, it can be 

done in temperature and in pressure according to the hardware configuration of the system (The 

presence of the pressure transducer excludes the temperature control). 

That process will be active even with switched-off unit; The pre-alarm fan switch-on in installations 

with particular environment conditions that can bring high pressure conditions with the unit off, 

preventively reducing the pressure, can permit the starting of the compressors in difficult 

circumstances. 


Rev. 1.0 20/01/05 27

8 DEFROST 


• Condenser temperature analogic inlet 

• Condensation pressure analogic inlet 


• Defrost type 

• Defrost starting temperature threshold 

• Defrost ending temperature threshold 

• Defrost starting pressure threshold 

• Defrost ending pressure threshold 

• Delay among following defrosts 

• Defrost activation delay 

• Defrost maximum last 

• Delay between compressor and valve at the defrost start 

• Delay between compressor and valve at the end of the defrost 

• Fan forcing activation in dripping phase 

• Fan speed set-up in dripping phase 


• Digital outlet of the refrigerating cycle inversion 

• All the digital outlets related to the compressors 

• All the digital/analogue outlets related to the condensation fans 


C PT [bar/ ºC] 

DefrOffTHR 

DefrOnTHR 

t [s] 

∆t1 ∆t2 ∆t3 DefrAct 

DefrOffTHR 

DefrOnTHR 

CPT 

∆t 1…3 

DefrAct 

T 

Defrost end threshold 

Defrost start threshold 

Condensation pressure/temperature 

Pressure/temperature permanence partial time in the defrost 

activation zone 

Active defrost 

Time 

Only in heat pump mode we can have the defrost activation. 


Rev. 1.0 20/01/05 28

If it’s whether or not the presence of the pressure transducer, the defrost will be done in 

temperature or in pressure, the temperature and pressure threshold for the enabling and disabling 

will be set-up. 

To start a defrost cycle the temperature/pressure must remain under the defrost start threshold, 

with compressor on, for a cumulative time same at the set-up activation delay time; If the 

temperature/pressure increases over the defrost end threshold that time must be reset, if the 

working way of the unit is changed (heat pump = > chiller), and if a feeding missing of the control 

electronic card occurs. 

The end of a defrost cycle can happen by temperature/pressure, if this last passes the threshold of 

the set-up defrost en d, or if the last passes the set-up time overtaking the ma 

ximum time. 


Rev. 1.0 20/01/05 29

8.3 Defrost mode 

It’s possible to have two defrost ways: 

- Contemporary 

- Separated (not possible for the single-circuit) 

According to the type of unit and the type of defrost the following table will be respected 

Contemporary 

defrost 

Unique 

ventilating 

section 

Separated 

ventilating 

section 

Single-circuit 

Twin-circuit 

Activated 

Activated 

Activated 

Activated 

Activated press. 

Activated 

condenser temp. 

condenser1 

condenser 2 

pressure probe 

1 probe 

pressure 2 probe 

Probe 

temp. Probe 

temp. Probe 

The temperature The defrost is The defrost in The defrost is 

The defrost in 

defrost its always possible. temperature it’s always possible. 

temperature is 

possible only if In the second possible only if On the first circuit 

possible only if theDefrost 

always both pressure 1 circuit it’s allowed both press.2 and it’s allowed that 

pressure probe ofpossible 

and 2 probe are that the pressure 1 are not the pressure 

the circuit it’s not 

not activated. In probe it’s not activated. On the probe is not 

activated 

the second circuit activated. If first circuit it’s activated. If 

is allowed that the press2 is allowed that the press1 is 

temperature activated, the temp.probe is not activated the 

probe it’s not defrost is done on activated. If defrost is done on 

activated. The the lowest of the temp1 is activated the lowest of the 

defrost is done on pressures. The the defrost is temperatures. 

the lowest of the defrost will always done on the The defrost will 

temperatures, if be contemporary lowest of the always be 

Not possible defrost Not possible the temp2 is in both circuits. temperatures. contemporary in 

defrost 

activated. The 

The defrost will both circuits. 

defrost will 

always be 

always be 

contemporary in 

contemporary in 

both circuits. 

both circuits. 

Separated 

defrost 

Unique 

ventilating 

section 

Separated 

ventilating 

section 

Not possible defrost Not 

defrost 

Not possible defrost Not 

defrost 

possible Not 

defrost 

possible 


temperature It’s 

possible only if 

the pressure 1 is 

not activated. 

Even the temp.2 

probe will be 

automatically 

activated. Each 

circuit defrosts 

according to his 

own probe. 

possible Not 

defrost 

It’s always 

possible. Even 

the press2 probe 

will be 

automatically 




own probe. 

possible Not 

defrost 

possible Not 

defrost 


temperature It’s 

possible only if 

the press.2 probe 

is not activated. 

Even the temp.1 

probe will be 

automatically 




own probe. 

possible 

It’s always 

possible. Even 

the press1 probe 

will be 

automatically 




own probe. 

8.3.1 Contemporary 

In the single-circuit case the defrost will be done according to the only temperature/pressure probe. 

In the twin-circuit case, if only one probe is present, the defrost of both circuits will be done on that 

probe, otherwise, with two probes, the lowest temperature/pressure among the two will always be 

controlled. 

To start a defrost cycle, the temperature/pressure must keep under the defrost start threshold, with 

at least one switch-on compressor in the whole unit, for a cumulative time same at the delay time 

of the set-up activation. In both circuits the defrost will always be contemporary activated. 

8.3.2 Separated 

Each circuit must have his own temperature/pressure probe. Each circuit will do the defrost 

separately from each other according to the value of his own temperature/pressure probe. To start 

a defrost cycle in a circuit the temperature/pressure must keep under the defrost start threshold, 

with at least one switched-on compressor of that circuit, for a cumulative time same at the set-up 

activation delay time. 


Rev. 1.0 20/01/05 30

8.4 Compressors and dripping 

The start and the end of a circuit defrost cycle starts with a switch-off of the compressor/s allowing 

the refrigerating cycle inversion of still gas. It’s possible set-up a delay time between compressor 

and cycle inversion valve for the start phase, and a delay time for the defrost end phase. 

Defrost start 

DS 

CMPS 

RV 

CMPS 

RV 

DS 

CVDS 

T[S] 

CVDS CVDS 

T[s] 

Compressors state 

Refrigerating cycle inversion valve 

Defrost start process 

Defrost start valve compressors delay 

Time 

During the inversion process of the refrigerating cycle, as was a forcing, the safety timings of the 

compressors are ignored. 

Defrost end 

CMPS 

DRIP 

DE 

RV 

CMPS 

RV 

DE 

CVDE 

DRIP 

T[S] 

CVDE CVDE 

T[s] 

Compressors state 

Refrigerating cycle inversion valve 

Defrost end process 

End defrost valve compressors delay 

Dripping process 

Time 

During the inversion process of the refrigerating cycle, as was a forcing, the safety timings of the 

compressors are ignored. 

The switch-off period of the compressor after a defrost, is known as dripping process, during this 

process the fans can be activated to remove the condensate of the exchanger. 


Rev. 1.0 20/01/05 31

8.5 Condensing fan 

During a defrost cycle the condensation fan/s will be switched-off. 

It will be activated during the dripping process, if the process from manufacturer’s opportune 

parameter protected from specific password is activated. The switch-off period of a compressor 

after a defrost, is known as dripping process. 

8.6 Low pressure alarm from pressure 

In the whole defrost process, the circuit’s low-pressure alarm 

be ignored. 

switch 

Only at the end of the dripping process (DE point of the previous graphic) the 

according to the set-up by-pass times will be activated. 

from pressure switch (digital inlet) will 

control of the alarm 


Rev. 1.0 20/01/05 32

9 TIME BENDS 

Two types of time bends are possible: setpoint variation and on/off. 

It’s possible separately activate 4 daily time bends. For each one there is a mask where the start 

hour and the summer and winter setpoint is set up (obviously the end hour is represented by the 

start hour of the next time bend) 

The o n/off time bend, instead, provides the set-up of: 

hour, minutes, of time bend start 

hour, minutes, of time bend start 

Beg in and end day witch inside of those, for each day, the time bend is done. 

The parameters are accessible only by PGD terminal where you can find them in the “clock” menu. 

REMARK: If the on-off time bend is activated, the setpoint time bends will be exclusively done if 

the unit is on by time bend. 

Obviously the time bends will be available only if there is a clock card. 

Example: 

Setpoint time zone1 

Enable:Y Start 8.00 

Summer set 12.0°C 

Winter 

set 40,0°C 




Winter set 42,0°C 









ON/OFF time zone:Y 

Switch ON 7.00 

Switch OFF 18.00 

From Mon to Fri 

With this set-up, the unit will switch-on everyday from Monday to Friday from 7:00 to 18:00 o’clock. 

From 8:00 to 10:00 o’clock the summer set of 12.0°C will be used, from 10:00 to 12:00 o’clock set 

= 11.0°C, from 12:00 to 18:00 o’clock (instead of 19:00) set = 15.0°C, after 18:00 switched-off unit 

and set = unit set. 


Rev. 1.0 20/01/05 33

10 HOUR METER 


• Compressor 1 working hours threshold 




• Working hour threshold of the main circulation pump 1 

• Working hour threshold of the main circulation pump 2 

• Compressor 1 hour meter zero setting 




• Main circulation pump 1 hour meter zero setting 

• Main circulation pump 2 hour meter zero setting 


• Relay digital outlet of cumulative alarm 


The counting function of the working hours number of compressors and pumps is provided; that 

function will provide at the visualisation of working hours number of each configured device and at 

the signalling of an alarm of working reached limit according to a threshold set by maintenance 

parameter, protected from specific password, that alarm will be only for visualisation mode and will 

not change nothing on the unit working. 

The visualisation will be done with the minimum resolution of 1 hour with 0÷999999 limits. 

The set-up of the “maintenance alarm” threshold, after reached the hours limit, will have minimum 

resolution of 1000 hours with 1000÷999000 limits. 

The memorisation of the working hours will happen every hour, so if a black-out after 1h59’59” of 

working of the device happens, at the restart of the system the number of visualised working hours 

will be 1. 


Rev. 1.0 20/01/05 34

11 ALARMS 

11.1 Reset - Visualisation 

The program is able to do a complete check-up of the unit signalling an alarm series, divided in 

circuit and system alarms. 

The intervention of one of these conditions provides the display visualisation of a specific message 

and the activation of a digital outlet. 

For some alarms the counting of the interventions in a specific time interval is provided, if that setup 

threshold is overtaken, is automatically modified the reset type from automatic to manual. 

The reset of the alarms with automatic reset of the alarms involves the cancellation of the display 

visualisation and the signalling by digital outlet at the end of the alarm condition. 

The reset of the manual reset alarms happens by pressing and releasing the [Alarm] key, after this 

operation the display visualisation and the signalling by a digital outlet will be cancelled. 

The manual reset involves the block of the related users and requests the intervention of qualified 

staff onboard unit for a safe reset of the special condition. 

11.2 Alarm log 

Being provided alarms with two ways of reset: automatic-manual, a log function that memorises the 

interventions of all the happened alarms will be provided, leaving a working track of the unit even 

for those automatic reset alarms witch visualisation disappears at the end of the condition. 

The log function provides, in the maximum configuration, the use of the date and hour values 

calculated by the optional clock card, activated by a manufacturer’s specific parameter, protected 

from dedicated password. 

At each alarm will be memorised: 

• intervention date and hour (if the optional clock is activated and installed) 

• total number of memorised events 

• code and description of the special event 

• the values of the water temperature relieved at the inlet and outlet from the evaporator 

• the values of the water temperature relieved at the inlet and outlet from the heat recovery coil 

(if the function is enabled) 

• working timer with at least a switched-on compressor (expressed in hours and minutes). At the 

compressor switch-on of the circuit a minutes timer will be started, that will indicate the 

intervention delay of alarm intervention of a device, at the complete switch-off of the 

compressors the contactor will be set at zero, waiting next switch-on. 

• condensation temperature/pressure of the circuit/ (if the 0÷5 Volt transducer is whether or not 

present) 

• state of the compressor/s and condensation fan/s right before the alarm event; the 

compressors state and the driving 0-100% value of the 0-10V (Comp:XXXX Fan:050%X) 

analogic outlet will be visualised 

The log of a maximum number of 100 events will be guaranteed (Carel reserves itself to verify 

possible memory limits), using a circular list of dates, witch, when a maximum number of 

memorisation is reached, the oldest date will be overwritten. 


Rev. 1.0 20/01/05 35

11.3 Alarms table 

Rhoss S. p.A. S.A.T. 

Rev. 1.0 20/01/05 

36

Code Alarm Compressor Fans OFF 

Pump Unit OFF Re-set Delay Notes 

description s OFF 

OFF 

012 High pressu re Circ.1 See notes No No Manual 0 s After an alarm in chiller mode, if activated, the post-ventilation function will 

by circuit 1 compressor/s 

be active. In the other cases the fan switch-off of the circuit 1 depends if his 

pressure 

switch 

working is whether or not connected at the compressor’s state (parameter 

in “Fan” menu) 

013 High pressure Circ. 2 See notes No No Manual 0 s 

After an alarm in chiller mode, if activated, the post-ventilation function will 

by circuit 2 compressors 


pressure 

switch 



023 High pressure 

Circ.1 See notes No No Manual 0 s 




transducer 



024 High pressure Circ.2 See notes 

No No Manual 0 s 


by circuit 2 compressors 


transducer 



010 Low pressure Circ.1 If the fans are No No Automatic – Manual Settable at the start Must be disabled during all defrost cycle and reactivated according to the 


connected at the 

(bound by the of the unit at running delays at the outlet of the same one 

pressure 

compressor’s state, 

number of set-up condition 

switch 

then, circuit 1 fans 

interventions) 

off 

011 Low pressure Circ.2 If the fans are No No Automatic – Manual Settable at the start Must be disabled during all defrost cycle and reactivated according to the 

from circuit 2 compressors connected at the 

(bound by 

the of the unit at running delays at the outlet of the same one 

pressure 

compressor’ s state, 

number of set-up condition 

switch 

then, circuit 2 fans 


off 

016 Circuit 1 Compressor If the fans are No No Automatic – Manual Settable at the start The switch-off of the unit caused by the compressor’s thermal alarm it’s 

compressor 1 1 circuit 1 connected at the 

(bound by the of the compressor bound at the set up of the working mode of the main circulation pump 

thermal 


number of set-up 

(continuous/bound at the thermal request) 

protector 

then, circ.1 fans off, 


With switched-off compressor the state of the alarm is ignored(Kriwan) 

only if both circ.1 

compressors in off 

017 Circuit 1 Circuit 1 If the fans are No No Automatic – Manual Settable at the start The switch-off of the unit caused by the compressor’s thermal alarm it’s 

compressor 2 compressor 2 connected at the 

(bound by the of the compressor bound at the set up of the working mode of the main circulation pump 

thermal 




protector 






018 Circuit 2 Circuit 2 If the fans are No No Automatic – Manual Settable at the start The switch-off of the unit caused by the compressor’s thermal alarm it’s 

compressor 1 

thermal 

protector 

019 Circuit 2 

compressor 2 

thermal 

compressor 1 

Circuit 2 

compressor 2 






If the fans are 



(bound by 

number of 


the 

set-up 

No No Automatic – Manual 

(bound by the 


of the compressor 

Settable at the start 

of the compressor 

bound at the set up of the working mode of the main circulation pump 



The switch-off of the unit caused by the compressor’s thermal alarm it’s 

bound at the set up of the working mode of the main circulation pump 



Rev. 1.0 20/01/05 37




OFF 

protector 






020 Condensation Yes Yes 1 and 2 circuit No No Automatic – Manual 0 s 

fan thermal 

(bound by the 

protection 



002 Evaporator Yes Yes Only ON Automatic – Manual Settable at t he start 

antifreeze 

pump (bound by 

the of the unit 

alarm 



030 Faulted probe Yes Yes Yes Yes Automatic 60 s 

B1 

031 Faulted probe Circ.1 

Only if connected Only if Only if Automatic 

60 s 

B2 

compressor/s 

with 1 circuit connect connecte 

ed with d with 1 

1 circuit circuit 

032 Faulted probe Circ.1 

Only if connected Only if Only if Automatic 

60 s 

B3 

compressor/s 



1 circuit circuit 

033 Faulted probe Circ. 1 Only if connected Only if Only if Automatic 60 s 

B4 

compressor/s 



1 circuit 

circuit 

034 Faulted probe Circ.2 If the fans are No No Automatic 

60 s 

B5 

compressor/s 

connected to the 

compres. 

state, 

then, circ.2 fan off 

035 Faulted probe Circ. 1 Only if connected Only if Only if Automatic 

60 s 

B6 

compressor/s with 1 circuit, connect connecte 

otherwise if the fans ed with 

d with 1 

are connected at the 1 circuit circuit 

comp ressor state, 


036 Faulted probe Circ. 2 If t he fans are No No Automatic 60 s 

B7 

compressor/s connected to the 

comp ressors state, 


037 Faulted probe Circ. 2 If t he fans are No No Automatic 60 s 

B8 


compressors state, 


038 B9 faulted Circ.2 If the fans are No No Automatic 60 s 

probe 


compressors state, 



Rev. 1.0 20/01/05 38




OFF 

005 Water flow Yes Yes Yes Automatic – Manual 

Settable at the start The alarm re-set 

is bound by a continuous minimum time without 

the alarm 

( bound 

by the of the unit at running 

conditions, settable by the mask. 



045 Discharged No No No No Manual Settable 

from 

the 

Must be disabled during all the defrost cycle or the heat recovery if active 

unit 

start 

of 

the 

compressor 

041 Compressor 1 No No No No Automatic 0 s Signalling of maximum reached limit of working hours 

maintenance 


maintenance 


maintenance 


maintenance 

040 Pump 1 No No No No Automatic 0 s Signalling of maximum reached limit of working hours 

maintenance 

046 Pump 2 No No No No Automatic 0 s Signalling of maximum reached limit of working hours 

maintenance 

055 Broken clock No No No No Automatic 0 s Broken or not connected clo ck card. The time bends if actives are disabled 

card 

056 Processes Yes Yes Yes Yes Manual 

0 s 

wrong 

sequence 

L1 Low Yes Yes Yes Yes Automatic 0 s The alarm re-set is bound by a 5,0 Volt set hysteresis 

feeding voltage 




057 


L1 Low Yes Yes Yes Yes Automatic 

0 s The alarm re-set is bound by a 5,0 Volt set hysteresis 








021 Faulted pump Yes Yes pompa Yes Manual 

0 s It switches-on after a settable number of followings interventions of the 005 

1 

1 

alarm that means water flow lack 

022 Faulted pump Yes Yes pompa Yes Manual 

0 s It switches-on after a settable number of followings interventions of the 005 

2 

1 

alarm that means water flow lack 


Rev. 1.0 20/01/05 39

11.4 Antifreeze management 


• Analogic inlet of the evaporator outlet water temperature 


• Antifreeze alarm threshold 

• Antifreeze alarm hysteresis 

• Offset of the working antifreeze electrical heater 

• Antifreeze electrical heater hysteresis 

• Antifreeze alarm by-pass time at the unit start 

11.4. 3 Used outlets 

• Relay digital outlet of the circuit 1 cumulative alarm 

• Digital outlet of the evaporator’s antifreeze electrical heater 


FA 

AFH 

HYSTA_F 

OFFS_AFH 

HYST_AFH 

EOWT [ºC] 

THRA_F 

THRA_F Antifreeze alarm threshold 

HYSTA_F Antifreeze alarm hysteresis 

FA Antifreeze alarm 

OFFS_AFH Antifreeze electrical heater threshold 

HYST_AFH Antifreeze electrical heater hysteresis 

AFH Antifreeze electrical heater 

EOWT Evaporator water outlet temperature 

The control of the antifreeze alarm is based on the temperature of the evaporator’s outlet water; a 

working hysteresis and a threshold are set-up: with lower temperature than the set-up threshold, alarm 

and switched-off devices will be signalled, turned-off the whole unit, with only the main circulation pump 

left on. 

The control of the antifreeze electrical heater provides the set-up of a temperature offset instead of a 

threshold of antifreeze alarm; that offset can be positive or negative and after added at the threshold of 

the antifreeze alarm will set the electrical heater before or after the alarm. 

The activation of the electrical heater will be possible only with switched-off unit or after the 

temperature’s regulation setpoint is reached; after his reaching the main circulation pump will be 

switched-on. 


Rev. 1.0 20/01/05 40

11.5 Flow alarm management 


• Digital inlet of the evaporator’s differential pressure switch 

11.5. 2 Used parameters 

• Number of maximum following alarms with automatic reset 

• By-pass time at the start of the main circulation pump 

• By-pass time at running 

• Requested time for the reset of the alarm since the pressure switch signals OK flow 

11.5. 3 Used outlets 

• Relay digital outlet of circuit 1 cumulative alarm 

• Digital outlet of the main circulation pump 1 

• Digital outlet of the main circulation pump 2 

11.5. 4 Working description 

From the evaporator side the pressure switch is single. There are provided some settable alarm’s byrun 

working. After this the signal of flow lack must be 

pass times at the start of the system and in the 

always present for a set period, before to put in alarm mode the unit with only one pump, or forcing a 

rotation among the pumps on double pump units. 

A maximum number of following alarms will be set (for each pump), over those the alarm changes from 

automatic to manual reset. 

When the unit has just one pump, in case of automatic reset alarm, the main circulation pump keeps 

running, if there are two pumps will be forced if possible a rotation among these, and in this case, the 

flow alarm will be signalled only after both pumps are damaged. With manual reset of the flow alarm the 

unit is completely switched-off. 

11.6 Signalling of discharged unit 


• Evaporator’s inlet water temperature analogic inlet 

• Evaporator’s outlet water temperature analogic inlet 


• E vaporator’s inlet-outlet water temperature delta 

• Alarm’s by-pass time 

• Discharged unit ala rm control activation 


• Relay digital outlet of circuit 1 cumulative alarm 


Necessary conditions to activate the alarm: 

- If the manufacturer parameter control, protected from specific password is activated; 

- If the evaporator’s inlet and outlet temperature probes are activated; 

- If a recovery or defrost cycle is running; 

- If the unit is ON; 

- If the pump is working; 

- If all the compressors are switched-on and at maximum power (unit at 100% of the refrigerating 

power) 

The water temperature values relieved from the probes fixed in the evaporator’s inlet and outlet are 

monitored; in the case when the difference (in absolute value) between 

the two temperatures is lower 


Rev. 1.0 20/01/05 41

than the set delta, if the control by opportune manufacturer’s parameter protected from specific 

password is activated, after the set delay, the alarm will be signalled. 

11.7 Phases control management 


• Three-phase card for phase sequence control and voltage measure 


• Feed nominal voltage 

• Type of feed 

• Phase monitor alarm activation (both tension min/max alarms and wrong phase sequence) 

• Network frequency 

• Minimum voltage treshold 

• Maximum voltage threshold 


• Relay digital outlet of cumulative alarm 


The pCO1OEM onboard card installation of a phase monitor card and phase wideness measure is 

provided, according to that the direct verify of the right link of the unit and the probable anomaly 

absorption of the phases is possible. 

The pCO OEM controller will be able to monitor the exact phases system in the three-phase systems, 

and if this is not correct, it will signal it by a manual reset alarm with following switch-off of all the linked 

loads. 

That alarm can be disabled by a special parameter protected from specific password, visible/adjustable 

from PGD interface. 

Ass well as the correct sequence control of the phases it provides at the control of the wideness 

according to two set minimum and maximum thresholds. 

According to the type of used feed system, the program will be able to decide if it’s whether or not the 

case to feed the measured F-N o F-F voltage (neutral-phase or phase-phase), the following table reports 

the provided correspondences: 

Type of Voltage Type of voltage 

distribution 

measurement 

1 F + N 230 V F-N 

3 F + N 400 V F-F 

3 F 230 V F-F 

From the table results that in three-phase systems the indications of phase-phase voltage will be always 

supplied. 

To indicate the type of used distributions, a set-up parameter that indicates the provided phases number 

and if it’s whether or not present the neutral will be introduced; that parameter will be protected from 

specific manufacturer’s password and visible/adjustable by PGD user’s interface. 

From the installed unit values is possible to determine the working voltage threshold over those the unit 

working is not guaranteed; will be then introduced a set-up parameter of the system’s nominal voltage. 

That value protected from manufacturer’s password is visible by PGD user’s interface will allow the 

preventive definition of the thresholds of minimum and maximum working voltage. 

Normally the tolerance is + 10%, on the basis of that values, as soon as the voltage value of nominal 

feed is set-up, the program will do a rapid calculation, automatically setting the thresholds of the width’s 

maximum and minimum alarm of the phases. 

If adjust those values for particular unit requirements is necessary, will be possible enter at the 

opportune parameters, protected from manufacturer’s password. 


Rev. 1.0 20/01/05 42

The overtaking of the width’s minimum and maximum thresholds of the phases will imply a distinct alarm 

signalling, but single code (A57 alarm), with following switch-off of the unit and all the connected loads. 

That alarm will be an automatic reset type with automatic reset of the working as soon as the normal 

working conditions are restarted. 

To guarantee a certain stability to the system will be introduced a 5,0 Volt fixed hysteresis to the alarm’s 

reset of minimum and maximum voltage, in that way not correct working due to oscillations of the value 

within very narrow range. 

At the card’s switch-on, to allow the correct update of the values, read from the phase monitoring card, is 

introduced a set delay of 60 seconds. In this gap the visualised values must not be considered reliable 

and the alarms of minimum and maximum voltage are disabled, while the alarm of wrong phase 

sequence is always active. 


Rev. 1.0 20/01/05 43

12 TERMINAL AND PARAMETERS 

12.1 Self-configuration of the terminals 

It’s provided a self-configuration of the terminals. At each switch-on the pCO-OEM will be configured to 

communicate with the terminal set out at 32. 

12.2 PGD Layout 

In the following drawing a layout of the PGD terminal used for the Rhoss’s remote user interface. 

ALARM 

PRG 

GREEN 

BACKLIGHTED 4x20 

DISPLAY 

MODE 

ON 

OFF 

12.2.1 LED signalling 

• Alarm Led (red alarm key 

backlighting) 

If switched-on indicates the presence of at least one active alarm 

• Prg 

Led (orange PRG 

key backlighting) 

If switched-on indicates that you are browsing in the parameter’s set-up masks 

• On-Off Led (Green On-Off key backlighting) 

Switched-on if the display backlighting is active, as soon as any key is pressed 

• Up Led (Green up key 

backlighting) 


• Down 

Led (Green down key backlighting) 


• Mode-Enter Led (Green Mode-Enter key backlighting) 


The display backlighting will be managed, driving the automatic switch-off of it, after about 30 seconds 

with the keyboard not working. 

12.2.2 Use of the keys 

[Alarm] key 

If at least one alarm condition is present allows the access to the alarm’s masks group. 

The second pressing from a mask alarm allows the reset of every active alarm and the visualisation of 

message deleting. 

[Prg] key 

If pressed for 5 following seconds from the main mask of the software allows the access to the sliding 

menus for the selection of the parameter’s class to change. 

[On / Off] key 

If the unit is switched-off it allows to switch it on s tarting up the start processes of the main circulation 

pump and the activation 

of the thermostatic regulation. 

If the unit is switched-on it allows to switch it off starting up every switch-off processes of the controlled 

devices and the main circulation pump. 

[Up] key 

Allows the scrolling among the masks of the sam e group. 


Rev. 1.0 20/01/05 44

If the slider is positioned in the high left corner of a configuration mask allows the passage to the 

previous mask. 

If the mask related to a particular active alarm is visualised, allows the passage of the eventual previous 

code of active alarm. 

If the slider is positioned on a set-up range of a parameter allows the increasing of the visualised value. 

[Mode - Enter ] key 

If the main mask of the software is visualised, where 

the unit sta te and readings of the main probes are 

indicated, allows the cyclic selection of the unit working mode, c hanging from summer mod e (cold water 

production) to winter mode (hot water production) and vice versa. 

In the visualisation and adjusting masks of the parameters does the function of moving among the set 

fields and confirmation of the selectioned values. 

[Down] key 

Allows the scrolling among the masks of the same group. 

If the slider is positioned in the high left corner of a configuration mask allows the passage to the 

previous mask. 

If the mask related to a particular active alarm is visualised, allows the passage of the eventual previous 

code of active alarm. 

If the slider is positioned on a set-up range of a parameter allows the increasing of the visualised value. 

12.3 Definition of the access password 

to the pr otected branches 

Each set-up parameter is integrated in an appropriate group of masks (depending from the safety level 

attributed to the self-parameter) protected from password. 

The passwords will be different according to the following correspondences: 

Masks group 

Password 

Manufacturer 0228 

User 0077 

Manufacturer: approaches to the hardware configuration masks of the system and of set-up of basic 

parameters for the working like safety delay times, alarm thresholds and activation delays. 

User: approaches to the visualisation’s masks of the dates useful to the user, like regulation band, 

antifreeze offset et… 

12.4 Set-up parameters list 

PGD description 

Parameter 

description 

Configuration Menu 

Config.unit Unit type CH+HP 

Default Limits Unit of 

measur 

ement 

CH 

--- 

CH+HP 

Total comps nr. Number of total 4 1-2-4 --- 

installed compressors 

Circuit nr. Number of circuits 2 1-2 --- 

Fans group nr. Number of ventilation 1 1-2 --- 

groups 

En. second pump Activation of second N Y/N --- 

pump circulation 

En.compr.rotat. Activation of Y Y/N --- 

compressors rotation 

En.layer device Activation of Y 

Y/N 

compressor’s 

equalised switch-on 

Phases nr. cfg Set-up of feed type 3ph+N 3ph+N --- 


Rev. 1.0 20/01/05 45

PGD description Parameter 

description 


measur 

ement 

1ph+N 

3ph 

En phases alarm Activation of 

alarms 

phases Y Y/N --- 

Voltage Set-up of nominal feed 400 0-450 V 

voltage 

Frequency Feed nominal 50 50-60 Hz 

frequency selection 

Supply voltage alarm Set-up of minimum 360 0-[Voltage] V 

min threshold voltage alarm 

threshold 

Supply voltage alarm Set-up of maximum 440 [Voltage]-450 V 

max threshold voltage alarm 

threshold 

Voltage Offset L1 Line 1 voltage 0 -99 / 99 V 

adjustment 


adjustment 


adjustment 

Setpoint 

Setpoint 

N Y/N --- 

compensation enable compensation 

summer 

activation in summer 

working 

Setpoint 

Setpoint 

N Y/N --- 

compensation enable compensation 

winter 

activation in winter 

working 

Input probe enable B1 Analogic inlet reading Y Y/N --- 

activation 1 

Input probe enable B2 Analogic inlet reading Y Y/N --- 

activation 2 

Input probe enable B3 Analogic inlet reading N Y/N --- 

activation 3 


activation 4 


activation 5 


activation 6 


activation 7 

Inputs probes offset Analogic inlet 0.0 -9.9-9.9 --- 

B1 

calibration 1 


B2 

calibration 2 


B3 

calibration 3 


B4 

calibration 4 

Inputs probes offset Analogic 

inlet 0.0 -9.9-9.9 --- 


Rev. 1.0 20/01/05 46


Parameter 

description 


measur 

ement 

B5 calibration 5 


B6 

calibration 6 


B7 

calibration 7 


B8 

calibration 8 


B9 

calibration 9 

Pressure probe range Set-up of the 0-5 volt 0.0 -50.0-50.0 bar 

0V 

inlet full scale 

minimum limit 

Pressure probe range Set-up of the 0-5 volt 34.0 -50.0-50.0 

bar 

5V 

inlet full scale 

maximum limit 

Digital inputs logic Digital inlet logic setup 

NC NC/NO --- 

pCO1OEM 2 

2 


NC NC/NO --- 

pCO1OEM 3 

3 


NC NC/ NO 

--- 

pCO1OEM 4 

4 


NC NC/NO --- 

pCO1OEM 5 

5 


NC 

NC/NO 

--- 

pCO1OEM 6 

6 


NO 

NC/NO --- 

pCO1OEM 7 

7 


NC NC/NO 

--- 

pCO1OEM 8 

8 

Digital inputs logic Digital inlet logic set- NC NC/NO --- 

pCO1OEM 10 up 10 


NC 

NC/NO --- 

pCO1OEM 11 

11 

Digital inputs logic Digital inlet logic set- NC NC/NO --- 


Digital output logic Digital outlet logic set- NO NO/NC --- 

pCO1OEM 1 

up 1 

Digital output logic Digital outlet logic setup 

NO NO/NC --- 

pCO1OEM 2 

2 


NO NO/NC --- 

pCO1OEM 3 

3 


NO NO/NC --- 

pCO1OEM 4 

4 


NO NO/NC 

--- 

pCO1OEM 5 

5 


NO NO/NC --- 

pCO1OEM 6 

6 

Digital output logic Digital outlet logic set- NC NO/NC --- 





Rev. 1.0 20/01/05 47


description 


measur 

ement 


pCO1OEM 9 

up 9 


NO 

NO/NC 

--- 

pCO1OEM 10 

10 


NO NO/NC --- 

pCO1OEM 11 

11 


NC NO/NC --- 

pCO1OEM 12 

12 

Supervisory system Serial communication RS485 

RS485 --- 

protocol type 

protocol selection 

RS232 

Modbus 

LonMark 

Supervisory system Communication speed 19200(RS485) 1200 

bps 

speed set-up to supervisor 2400 

4800 

9600(RS485) 

19200(RS485) 

Supervisory system Serial identification 1 1-200 --- 

identificat.Nr. address set-up 

FLRHSMCHIO V. Software version --- 

--- --- 

visualisation 

Please insert unlock Beta versions unlock 0 -32767/32767 --- 

code 

code 

Reset all parameters Start of the memory --- Y/N --- 

to default values delete process and 

default installation 

values 

Erase log Start of the alarm log --- Y/N --- 

memory delete 

process 

Insert another Adjust of the 228 0-9999 --- 

manufacturer parameters access 

password 

password 

Pump menu 

Main pump ON if Main pump working Unit ON Unit ON 

mode set-up 

Compressor ON 

Main pump switching Delay set-up at the 15 0-999 s 

off delay time main pump switch-off 

Time between main Devices activation 15 

0-999 s 

pump and delay set-up from the 

compressors start start of the main pump 

Pumps rotation time Rotation time among 999 0-999 H 

the pumps 

Test rotation 

Activation at the pump N N-Y --- 

rotation 

Test rotat.time Test 

times 

pumps rotation 1 0-999 m 

Pumps mode Pumps working mode Auto Auto – Only P1 – Only --- 

P2 

Compressor menu 

Minimum compressor Compressor working 60 0-9999 s 


Rev. 1.0 20/01/05 48


power-on time 

Minimum compressor 

power-off time 

Min time betw. diff. 

comp start 

Min time betw. same 

comp. start 

Fan menu 

Enable condenser fan 

pre-ventilation 

Enable force cond. fan 

by HP alarm 

Condenser fan lag 

compressor 

Local condensation 

summer setpoint 


summer diff. 


winter setpoint 


winter diff. 

Parameter 

description 


measur 

ement 

minimum time 

Set-up of the 180 0-9999 s 

compressor switch-off 

minimum time 

Set-up of the minimum 0 0-9999 s 

time among different 

compressors starting 

times 

Set-up of the minimum 360 0-9999 s 

time among starting 

times of the same 

compressor 

Condenser preventilation 

activation 

Condensation fans 

forcing activation for 

high pressure alarm 

Fan working activation 

connected to the 

compressor working 

state 

Set-up of the summer 

condensation 

regulation setpoint 

Set-up of the summer 

condensation 

regulation band 

Set-up of the winter 

condensation 


Set-up of the winter 

condensation 

regulation band 

Condenser fan max Set up of the 

speed condensation fan 

maximum speed 

Condenser fan min Set up of the 

speed 

condensation fan 

minimum speed 

Condenser fan cut off Set-up of the 

condensation fan cutoff 

hysteresis 

Condenser fan speedup 

time 

Working time set-up at 

maximum speed at the 

start 

Y Y/N --- 

Y Y/N --- 

Y Y/N --- 

14.0 -999.9-999.9 

bar 

6.0 0.0-999.9 bar 

7.0 -999.9-999.9 bar 

3.0 0.0-999.9 bar 

10.0 0.0-10.0 V 

3.0 0.0-10.0 

V 

0.5 0.0-10.0 bar 

1 0-999 s 

Condenser fan in Fan working activation N Y/N --- 

dripping mode enable in dripping mode 

Condenser fan in Fan speed in dripping 100 0-100 % 

dripping mode speed mode 

Enable high press. High pressure pre- N Y/N --- 


Rev. 1.0 20/01/05 49


Parameter 

description 

prevent in normal alarm activation in 

normal working 

Setpoint Set-up of high 

condensation pressure 

pre-alarm setpoint 

Diff. Set-up of high 


pre-alarm hysteresis 


measur 

ement 

26.0 -99.9-99.9 bar 

6.0 0.0-99. 9 bar 

Setpoint Set-ucondensation pressure 

of high 60.0 -999.9-999.9 °C 

pre-alarm setpoint 

Diff. Set-up of high 10.0 

0.0-999.9 °C 

condensation 

temperature pre-alarm 

hysteresis 

Enable high High pressure pre- N Y/N --- 

press.prevent in alarm activation in 

defrost 

defrost mode 

Setpoint 

Set-up of high 25.0 

-99.9-99.9 bar 


pre-alarm setpoint in 

defrost mode 

Diff. 

Set-up of high 5.0 

0.0-99.9 bar 


pre-alarm hysteresis in 

defrost mode 

Setpoint 

Set-up of high 55.0 -999.9-999.9 °C 

condensation 

temperature prealarm 

setpoint in 

defrost mode 

Diff Set-up of the high 10.0 0.0-999.9 °C 

condensation 

temperature pre-alarm 

hysteresis in defrost 

mode 

Alarm menu 

Enable high press. 

probe alarm 

High pressure alarm N Y/N --- 

activation by 

transducer 

Setpoint Set-up of the high 27.0 -.0-99.9 bar 

pressure alarm 

setpoint by transducer 

Diff. High pressure alarm 7.0 0.0-99.9 bar 

hysteresis set-up by 

transducer 

Time by-pass freeze Antifreeze alarm delay 15 0-999 s 

alarm from start pump time from the main 

pump start-up 

Evaporat.flow alarm Evaporator flow alarm 15 0-999 s 

start-up delay delay time at the pump 

start-up 


Rev. 1.0 20/01/05 50


Parameter 

description 


measur 

ement 

15 0-999 s 

Evaporat.flow alarm Evaporator flow alarm 

run delay 

delay time at running 

Evaporat.flow alarm Evaporator flow alarm 15 0-999 s 

reset delay 

automatic reset delay 

time 

Delay overload Compressor thermal 5 0-999 s 

comp.alarm from start 

alarm delay time from 

compressor 

the compressor startup 

Num.retry 

Set-up of the 3 0-9 --- 

evap.flow/pump evaporator damaged 

damage alarm flow/pump alarm 

repeating number 

Num.alarm per hour Set-up of the 0 0-9 --- 

freeze 

antifreeze alarm 



overload comp. compressor thermal 

alarm repeating 

number 


overl.cond.fan condensation fan 

thermal alarm 


Num.alarm per hour Set-up of the low 3 0-9 

--- 

low pressure pressure alarm 


Defrost menu 

Defrost type Type of defrost Simultaneous Simultaneous/Separated --- 

Defrost parameters by Set-up of the defrost 2.9 -99.9 -99.9 

bar 

pressure start activation threshold by 

pressure 

Defrost parameters by Set-up of defrost end 18.0 

-99.9-99.9 bar 

pressure stop threshold by pressure 

Defrost parameters by Set-up of defrost -2.0 

-99.9-99.9 °C 

temperature start activation threshold by 

temperature 

Defrost parameters by Set-up of defrost end 21.0 -99.9-99.9 °C 

temperature stop threshold 

by 

temperature 

Defrost parameters Delay time at the 2400 0-32000 s 

delay time 

defrost activation 

Defrost parameters Defrost last maximum 600 0-32000 s 

maximum time time 

Time between two Delay time between 0 0-500 m 

defrost 

two following defrost 

cycles 

Defrost parameters Compressors switchoff 

5 0-999 s 

forcing time at the 

force compressor off 

when defrost begin inlet of a defrost 

Defrost parameters Compressors switch- 5 0-999 s 


Rev. 1.0 20/01/05 51


Parameter 

description 


measur 

ement 

force off compressor off forcing time at the 

when defrost end outlet of a defrost 

Defrost config. Activation at the Y Y/N --- 

comp.timing reset compressors timings 

during defrost reset during a defrost 

Hours menu 

Hour meter Pump1 Main pump work hours --- ---- h 

visualisation 

Hour meter Pump2 Main pump work hours --- ---- h 

visualisation 

Hour meters circuit 1 Compres.1 circulat.1 --- ---- h 

compressor 1 work 

hours 

visualisation 

Hour meters circuit 1 Compres.2 circulat.1 --- ---- h 

compressor 2 work 

visualisation 

hours 

Hour meters circuit 2 Comp.1 circ.2 work --- ---- h 

compressor 1 hours visualisation 

Hour meters circuit 2 Comp.2 circ.2 work --- ---- h 

compressor 2 hours visualisation 

Main pump 1 hour Set-up of the main 5 0-999 h x1000 

meter threshold pump 1 maintenance 

alarm threshold 

Main pump 1 hour Reset of the main 

--- Y/N --- 

meter req. reset pump 1 working hour 

meter 

Main pump 2 hour Set-up of the main 5 0-999 h x1000 

meter threshold pump 2 maintenance 

alarm threshold 

Main pump 2 hour Reset of the main --- Y/N --- 

meter req. reset pump 2 working hour 

meter 

Compressor1 circuit1 Set-up of the 3 0-999 h x1000 

hour meter threshold compressor 1 circuit 1 

maintenance alarm 

threshold 

Compressor1 circuit1 Reset of the --- Y/N --- 

hour meter req. reset compressor 1 circuit 1 

working hour meter 




threshold 







threshold 



Rev. 1.0 20/01/05 52


Parameter 

description 



Compressor2 circuit2 Set-up of the 



threshold 

Compressor2 circuit2 Reset of the 



Compressors enable Compressor 1 

Circuito1 C1 

activation 

Compressors enable Compressor 2 

Circuito1 C2 

activation 

Compr 


measur 

ement 

3 0-999 h x1000 

--- Y/N --- 

Y Y/N --- 

Y Y/N --- 

Compressors enable essor 1 Y Y/N --- 

Circuito2 C1 

activation 

Compressors enable Compressor 2 Y 

Y/N --- 

Circuito2 C2 

activation 

Setpoints menu 

Summer setpoint Set-up of the summer 12.0 

Summer temperature °C 


setpoint limits low / 

Summer temperature 

setpoint limits high 

Winter setpoint Set-up of the winter 40.0 Winter temperature °C 


setpoint limits low / 

Winter temperature 

setpoint limits high 

User menu 

Temperature band Set-up of the 2.0 0.0-99.9 °C 

temperature regulation 

band 

Winter temperature Set-up of the winter 25. 0 -99.9 -99.9 

°C 

setpoint limits low setpoint lower limit 

Winter temperature Set-up of the winter 48.0 -99.9-99.9 °C 

setpoint limits high setpoint higher limit 

Summer temperature Set-up of the summer -5.0 -99.9-99.9 °C 

setpoint limits low setpoint lower limit 

Summer temperature Set-up of the summer 25.0 -99.9-99.9 °C 

setpoint limits high setpoint higher limit 

Summer setpoint Set-up of the setpoint 0.0 

-99.9-99.9 °C 

compensation setpoint for summer regulation 

setpoint compensation 

Summer setpoint Set-up of the summer 0.0 0.0-99.9 

°C 

compensation delta setpoint compensation 

Summer setpoint Set-up of the summer 0.0 0.0-99.9 °C 

compensation offset setpoint compensation 

offset 

Winter setpoint Set-up of the setpoint 0.0 

-99.9-99.9 °C 

compensation setpoint for winter regulation 

setpoint compensation 

Winter setpoint Set-up of the winter 0.0 0.0-99.9 °C 

compensation delta setpoint compensation 


Rev. 1.0 20/01/05 53


Parameter 

description 


measur 

ement 

delta 

Winter setpoint Set-up of the winter 0.0 0.0-99.9 

°C 

compensation offset setpoint compensation 

offset 

Enable remote on-off On-Off activation by N Y/N --- 

by supervisory supervisory 

Enable summer/winter Summer/winter 

N Y/N --- 

by supervisory 

activation by 

supervisory 

Time condenser fan Pre-ventilation time 30 0-999 s 

pre-ventilation 

Time post-ventila. Post-ventilation alarm 60 0-999 s 

after HP alarm after high pressure 

alarm 

Antifreeze heater Set-up of the 1.0 0.0-99 .9 

°C 

offset 

antifreeze heater 

offset set-up 

Antifreeze heater hyst. Set-up of the 1.0 0.0-99 .9 

°C 

antifreeze heater 

hysteresis 

Antifreeze alarm Set-up of the 3.0 -99.9-99.9 °C 

setpoint 


setpoint 

Antifreeze alarm hyst. Set-up of the 2.0 0.0-99.9 °C 


hysteresis 

Low pressure alarm Low pressure alarm 120 0-999 s 

start-up delay start-up delay time 

Low pressure alarm Low pressure alarm 15 0-999 s 

run delay 

run delay time 

Enable discharge unit Discharged unit alarm N Y/N --- 

alarm 

activation 

Delta In/Out Set-up of the 10.0 0.0-50.0 °C 

temperature delta for 

discharged unit alarm 

Delay alarm 

Insert another 

maintenance 

password 

Rem.Summer/Winter 

Enable summer/winter 

remote control 

Condensing control 

Enable press. Probe 

Circuit 1 

Discharged unit alarm 

delay time 

Adjust of the 

parameters access 

password 

It enables the 

summer/winter remote 

inlet 

180 0-9999 

s 

77 0-9999 

--- 

N N/Y --- 

Activation of the 0-5 N Y/N --- 

Volt pressure 

transducer control for 

circuit 1 condensation 

control 

Enable press. Probe Activation of the 0-5 N Y/N --- 


Rev. 1.0 20/01/05 54


Parameter 

description 

Circuit 2 Volt pressure 

transducer control for 

circuit 2 condensation 

control 

Ventil.type Set-up of the 

ventilation type 


measur 

ement 

Proport. 

On-Off / Proport. --- 

Clock 

Enable 32KB clock Enabling of the clock N N/Y --- 

board 

card management 

Clock config. time Hour set-up --- 0-23 --- 

Clock config. time Minutes set-up --- 0-59 --- 

Clock config. date Day set-up --- 1-31 --- 

Clock config. date Month set-up --- 1-12 --- 

Clock config. date Year set-up --- 0-99 --- 

Enable time bend 1 Enabling of the N N/Y --- 

setpoint 

setpoint time bends 1 

Setpoint time bend 1 Setpoint time bend 1 0 0-23 Hours 

start 

start hour 

Setpoint time bend 1 Setpoint time bend 1 0 0-59 Minutes 

start 

start minutes 

Setpoint time bend 1 Time bend 1 summer 0 0 - 999 °C 

summer set 

setpoint 

Setpoint time bend 1 Time bend 1 winter 0 0 – 999 °C 

winter set 

setpoint 

Enable time bend 2 Setpoint time bend 2 N N/Y --- 

setpoint 

enabling 


start 

start hour 


start 

start minutes 


summer set 

setpoint 


winter set 

setpoint 

Enable time bend 3 Setpoint time bend 3 N N/Y --- 

setpoint 

enabling 


start 

start hour 


start 

start minutes 


summer set 

setpoint 


winter set 

setpoint 

Enable time bend 4 Setpoint time bends 4 N N/Y --- 

setpoint 

enabling 


start 

Setpoint time bend 4 

start 

start hour 

Setpoint time bend 4 

start minutes 

0 0-59 Minutes 


Rev. 1.0 20/01/05 55


description 


measur 

ement 


summer set 

setpoint 


winter set 

setpoint 

Enable time bend On- On-off time bends N N/Y --- 

Off 

enabling 

ON/OFF time bend On-off time bend 0 

0-23 Hours 

switch ON 

switch ON hour 

ON/OFF 

time bend On-off time bend 0 0-59 Minutes 

switch ON 

switch ON minutes 

ON/OFF time bend On-off time bend 

0 0-23 

Hours 

switch OFF 

switch OFF hour 

ON/OFF time bend On-off time bend 0 0-59 

Minutes 

switch OFF 

switch OFF minutes 

ON/OFF time bend On-off time bend *** Mon-Tue-Wed-Thu-Fri- 

--- 

From 

switch-ON day 

Sat-Sun 

ON/OFF time bend to On-off time bend end *** Mon-Tue-Wed-Thu-Fri- 

--- 

day 

Sat-Sun 


Rev. 1.0 20/01/05 56

13 SUPERVISORY 

The transmission of the values through RS485, RS232 Carel prot ocol, Modbus, is possible. 

A communication database that includes all the most important variables of the program is provided, 

from the read values of the probe to the set parameters on the masks. The following table reports the 

database, split in digital integer and analogics variables, reporting the description, the address and 

the type (only reading ”R” or reading/w riting “R/W”) for every one. 

13.1 Variables: Digitals – Inte ger – Analogic 

s 

Description Type Address R/W Notes 

Digitals 

Working mode DIG 1 RW 0:Cooling 1:Heating 

On/Off unit by supervisory DIG 2 RW 0:Off 1:On 

Unit state DIG 3 R 0:Off 1:On 

Number 1 digital inlet DIG 4 R 0:C 1:O 












Number 1 digital outlet DIG 16 R 0:O 1:C 












Antifreeze alarm DIG 28 R 0:OK 1:Alarm 

Circ.1 comp.1 thermal alarm DIG 29 R 0:OK 1:Alarm 




Evaporator flow alarm DIG 33 R 0:OK 1:Alarm 

Circuit 1 low pressure alarm DIG 35 R 0:OK 1:Alarm 

Circuit 2 low pressure alarm DIG 36 R 0:OK 1:Alarm 

Condenser fan thermal alarm DIG 37 R 0:OK 1:Alarm 

Pump 1 working hours alarm DIG 38 R 0:OK 1:Alarm 


Circ.1 comp.1 working hours alarm DIG 40 R 0:OK 1:Alarm 




Rev. 1.0 20/01/05 57


Circ.2 comp.2 working hour alarm DIG 43 R 0:OK 1:Alarm 



Circ.1 transducer high pressure 

alarm DIG 46 R 0:OK 1:Alarm 

Circ.1 transducer high pressure 

alarm DIG 47 R 0:OK 1:Alarm 

Damaged B1 probe alarm DIG 48 R 0:OK 1:Alarm 









Damaged clock card alarm DIG 57 R 0:OK 1:Alarm 

Sink refrigerating circuits alarm DIG 58 R 0:OK 1:Alarm 

Wrong sequence phases alarm DIG 59 R 0:OK 1:Alarm 

Line 1 high voltage alarm DIG 60 R 0:OK 1:Alarm 

Line 1 low voltage alarm DIG 61 R 0:OK 1:Alarm 





Damaged pump 1 alarm DIG 66 R 0:OK 1:Alarm 

Damaged pump 2 alarm DIG 67 R 0:OK 1:Alarm 

Unit type DIG 68 RW 0:CH 1:CH+HP 

Second pump enabling DIG 69 RW 0:NO 1:YES 

Three-phase alarms enabling DIG 70 RW 0:NO 1:YES 

Summer compensation enabling DIG 71 RW 0: NO 1:YES 

Winter compensation enabling DIG 72 RW 0: NO 1:YES 

Probe 1 enabling DIG 73 RW 0: NO 1:YES 


Probe 3 enabling 

DIG 75 RW 0: NO 1:YES 










Ventilation control type DIG 82 RW 0: On-Off 1:Proporzionale 

Pump/s working type DIG 83 RW 0:Unit ON 1:Compressor ON 

Pre-ventilation enabling DIG 84 RW 0:NO 1:YES 

Fan forcing enabling for HP DIG 85 RW 0:NO 1:YES 

Fan working mode DIG 86 RW 0:NO LAG 1:LAG COMPRESSOR 

Ventilation enabling in dripping 

mode DIG 87 RW 0:NO 1:YES 

HP prevention enabling in normal 

function DIG 88 RW 0:NO 1:YES 

Defrost type DIG 89 RW 0:NO 1:YES 

HP prevention enabling in defrost 



Rev. 1.0 20/01/05 58


HP alarm enabling by transducer DIG 91 RW 0:NO 1:YES 

Time bends reset enabling in defrost 


Summer/winter swap enabling by 

DIN DIG 93 RW 0:NO 1:YES 

Discharged unit alarm enabling DIG 94 RW 0: NO 1:YES 

Setpoint time bend 1 enabling DIG 95 RW 0:NO 1:YES 

Setpoint time bend 2 enabling DIG 96 RW 0:NO 1:YES 

Setpoint time bend 3 enabling DIG 97 RW 0: NO 1:YES 

Setpoint time bend 4 enabling DIG 98 RW 0: NO 1:YES 

Setpoint on-off time bend enabling DIG 99 RW 0:NO 1:YES 

Integer 

0: ON 1:OFF BY ALARM 2:OFF BY 

SUPERV. 3:OFF BY T. ZONE 4:OFF 

BY DIG.IN. 5:OFF BY KEYB. 

Unit state INT 1 R 6: MANUAL 

0:SUMMER 1:WINTER 2:WINTER / 

Working mode INT 2 R DEFROST 

Circ.1 comp.1 state INT 3 R 0: CAN START-UP 1:ON 2:ON BY 

Circ.1 comp.2 state INT 4 R TIMING 3:OFF BY TIMING 4:OFF BY 

Circ.2 comp.1 state INT 5 R PREVENT 

5:OFF BY DEFROST 

6: TIME FROM PUMP 7:UNIT OFF 

Circ.2 comp.2 state INT 6 R 8: OFF BY ALARM 9:DISABLE 

Circ.1 fan state INT 7 R 0:NORMAL MODE 1:HP PREVENT 

2: TIME FROM PUMP 3:UNIT OFF 

4: OFF BY DEFROST 5:PRE- 

VENTILATION 

6:FORCE IN DROPP. 

7: POST-VENT BY HP 8:ON (by 

dig.out) 9:OFF(by dig.out) 

Circ.2 fan state INT 8 R 10:OVERLOAD FAN AL. 

Circ.1 comp. switch-on hours INT 9 R 

Circ.1 comp. switch-on minutes INT 10 R 

Circ.2 comp. switch-on hours INT 11 R 

Circ.2 comp. switch-on minutes INT 12 R 

Line 1 voltage INT 13 R 



Higher part of the software’s version INT 16 R 

Lower part of the software’s version INT 17 R 

Unit compressors number INT 18 R 

Circuits number INT 19 R 

Ventilation groups number INT 20 R 

Minimum threshold of line voltage INT 21 RW 

Maximum threshold of line voltage INT 22 RW 

Pump/s switch-off delay INT 23 RW 

Compressor switch-on delay by 

pump switch-on INT 24 RW 

Pump rotation time INT 25 RW 

Test pumps rotation time INT 26 RW 

Pumps working mode 

INT 27 RW 0: Auto 1:Only P1 2:Only P2 

Compressor on minimum time INT 28 RW 

Compressor off minimum time INT 29 RW 


Rev. 1.0 20/01/05 59


Min time among ON of different 

compressors INT 30 RW 

Min time among ON of the same 

compres. INT 31 RW 

Fan Speed-up time INT 32 RW 

Fan speed in dripping mode INT 33 RW 

Antifreeze delay by pump ON INT 34 RW 

Flow alarm delay by pump ON INT 35 RW 

Flow alarm delay at running INT 36 RW 

Flow alarm reset delay INT 37 RW 

Thermal alarm delay by compressor 

ON INT 38 RW 

Faulted flow/pump alarm number INT 39 RW 

Automatic antifreeze alarm number INT 40 RW 

Automatic compressor thermal 

alarm number INT 41 RW 

Automatic fan thermal alarm number INT 42 RW 

Automatic LP alarm number INT 43 RW 

Defrost delay INT 44 RW 

Defrost maximum last INT 45 RW 

Minimum time between 2 following 

defrosts 

INT 46 RW 

T.off comp. at the defrost ON INT 47 RW 

Compressor off time to the OFF of 

the defrost INT 48 RW 

Pre-ventilation time INT 49 RW 

Post-ventilation time for HP INT 50 RW 

LP alarm delay by compressor ON INT 51 RW 

LP alarm delay at running INT 52 RW 

Discharged unit alarm delay INT 53 RW 

Setpoint time bend 1 start hour INT 54 RW 

Setpoint time bend 1 start minutes INT 55 RW 







On-off time bend start hour INT 62 RW 

On-off time bend start minutes INT 63 RW 

On-off time bend end hour INT 64 RW 

On-off time bend end minutes INT 65 RW 

On-off time bend start day INT 66 RW 

On-off time bend end day INT 67 RW 

Pump 1 work hours (High part 

example..99…) INT 71 R 

Pump 1 work hours (Low part 

ex.:..999) INT 72 R 

Pump 2 work hours (high part 

es.:99…) INT 

73 R 

Pump 2 work hours (low part 

ex.:..999) INT 74 R 


Rev. 1.0 20/01/05 60


Comp. 1 work hours (high part 

ex.:99…) 

INT 75 R 

Comp. 1 work hours (low part 

ex.:..999) INT 76 R 


ex.:99…) INT 77 R 


ex.:..999) INT 78 R 


ex.:99…) 

INT 79 R 


es.:..999) 

INT 80 R 


ex.:99…) INT 81 R 


ex.:..999) INT 82 R 

Analogics 

inlet 1 ANA 1 RW 

Analogic inlet 2 ANA 2 R 








Circ.1 fan analogic outlet ANA 10 R 

Circ.2 fan analogic outlet ANA 11 R 

Summer Setpoint ANA 12 R 

Winter Setpoint ANA 13 RW 

Work Band ANA 14 RW 

Winter setpoint lower limit ANA 15 RW 

Winter setpoint higher limit ANA 16 RW 

Summer setpoint lower limit ANA 17 RW 

Summer setpoint higher limit ANA 18 RW 

Summer condensation setpoint ANA 19 RW 

Summer condensation differential ANA 20 RW 

Winter condensation differential ANA 21 RW 

Winter condensation differential ANA 22 RW 

Fan maximum speed ANA 23 RW 

Fan minimum speed ANA 24 RW 

Fan cut-off hysteresis ANA 25 RW 

HP prevention setpoint in pressure ANA 26 RW 

HP prevention differential in 

pressure ANA 27 RW 

HP prevention setpoint in 

temperature ANA 28 RW 

HP prevention differential in 


HP prevention setpoint in pressure 

and defrost ANA 30 RW 

HP prevention differential in ANA 31 RW 


Rev. 1.0 20/01/05 61


pressure and defrost 

HP prevention setpoint in 

temperature and defrost ANA 32 RW 

HP prevention different. In temp. 

and defro st 

ANA 33 

RW 

High pressure alarm setpoint ANA 34 

RW 

High pressure alarm differential ANA 35 RW 

Defrost start threshold in pressure ANA 36 RW 

Defrost sop threshold in pressure 

ANA 37 RW 

Defrost start threshold in 


Defrost stop threshold 

in 

temperature 

ANA 39 RW 

Summer compensation setpoint ANA 40 RW 

Summer compensat ion setpoint ANA 41 RW 

Maximum summer compensation ANA 42 RW 

Winter compensation setpoint ANA 43 RW 

Winter compensation differential ANA 44 RW 

Maximum winter compensation ANA 45 RW 

Electrical heaters offset ANA 46 RW 

Electrical heaters hysteresis ANA 47 RW 

Antifreeze alarm setpoint ANA 48 RW 

Antifreeze differential ANA 49 RW 

Temperature difference in the 

discharged unit outlet terminal ANA 50 RW 

Time bend 1 summer setpoint ANA 51 RW 

Time bend 1 winter setpoint ANA 52 RW 







13.2 Variables database for LonMark protocol 

The software is provided of a database for the interfacement with a LonWork system and is conformable 

at the LonMark ® 8040_10 – Chiller profile. 

It’s necessary to set the special mask in Factory menu -> Configuration menu the LonMark protocol. 

Carel has already got the LonWorks® programmed cards in the factory, giving then the following sell 

code: 

PCO10001F0 

PCO1 SER. LON FTT10 STD CHILLER PROFILE 

The software is available even by request like NXE file, witch, the LonWorks® system integrator, can 

program the (PCO*0000F0) empty cards right there. 


Rev. 1.0 20/01/05 62

13.2.1 Digital variables 

Carel 

Nome LonMark LonMark SNVT 

Description address Type 

type 

Notes 

On/Off unit by 

nviChillerEnable SNVT_switch 

supervisory 1 RW 

0:Off 1:On 

Unit state 2 R nvoOnOff SNVT_switch 0:Off 1:On 

13.2.2 Analogic variables 

Carel LonMark name LonMark SNVT 

Description address Type 

type 

Notes 

Unit summer setpoint 1 RW nviCoolSetpt SNVT_temp_p °C 

Setpoint in use by the 

nvoActiveSetpoint SNVT_temp_p 

unit 2 R 

°C 

Chiller inlet 

nvoEntChwTemp SNVT_temp_p 

temperature 4 R 

°C 

Unit winter setpoint 5 RW nviHeatSetpt SNVT_temp_p °C 

Chiller outlet 

nvoLvgChwtemp SNVT_temp_p 

temperature 6 R 

°C 


Rev. 1.0 20/01/05 63

Manual pCoOEM Bicircuit - Rhoss

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