dIXEL IPC400D SERIES User manual

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USER MANUAL – Release 1.2 of 01/01/2010 Page 1 of 191
Version: 02/03/2010
PROGRAMMABLE CONTROLLERS
IPC400D SERIES
USER MANUAL
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Version: 02/03/2010
INDEX
1. GENERAL RECOMMENDATIONS 10
1.1 SAFETY PRECAUTIONS 10
2. GENERALITIES 11
2.1 MAIN FUNCTIONS 11
3. IPC400D SERIES FEATURES 13
4. ANALOGUE -DIGITAL INPUTS/OUTPUTS CONFIGURATIONS 14
4.1 ID1 –ID20 DIGITAL INPUTS CONFIGURATION 14
4.2 RL1-RL15 DIGITAL OUTPUTS CONFIGURATION 16
4.3 ANALOGUE INPUTS PB1 -PB10 CONFIGURATION 20
4.4 CONFIGURATION OF THE OUT1 / OUT4 PROPORTIONAL OUTPUTS 21
4.5 CONFIGURATION OF THE OUT5 / OUT6 PROPORTIONAL OUTPUTS 21
4.6 HOW TO CONFIGURE THE INPUTS AND OUTPUTS (FILE IO.CONF) 22
4.7 FURTHER CONNECTIONS 23
5. PARAMETERS IN TABLE FORM 23
6. IPRO.CHILL PROGRAMMABLE CONTROLLER 49
6.1 IPRO RANGE CONTROLLER LEDS MEANING/WORKING 49
7. IPRO.CHILL WIRING DIAGRAMS 50
7.1 IPC410D MODEL HARDWARE RESOURCES 50
7.2 IPC415D MODEL HARDWARE RESOURCES 51
7.3 NTC/PTC PROBES ANALOGUE INPUTS 52
7.4 DIGITAL INPUTS 52
7.5 4÷20MA PRESSURE TRANSDUCERS ANALOGUE INPUTS 52
7.6 0÷5V RATIOMETRIC PRESSURE TRANSDUCERS ANALOGUE INPUTS 53
7.7 OUTDOOR FAN SPEED CONTROL PWM OUTPUTS 53
7.8 OUTDOOR FAN SPEED 0÷10V / 4÷20mA OUTPUTS 53
7.9 SERVOMOTORS CONTROL 0÷10V / 4÷20MA PROPORTIONAL OUTPUTS 54
7.10 PROPORTIONAL OUTPUTS CONFIGURED FOR PILOTING AN EXTERNAL RELAY 55
7.11 VGIPC REMOTE TERMINAL COLLECTION 55
8. IPROEX60D EXPANSION MODULE 56
8.1 EXPANSION MODULE LEDS MEANING/WORKING 56
9. IPROEX60D EXPANSION MODULE WIRING DIAGRAMS 57
9.1 IPROEX60D EXPANSION MODEL HARDWARE RESOURCES 57
9.2 EXPANSION MODULE CONNECTION TO THE PROGRAMMABLE UNIT 58
10. ELECTRONIC THERMOSTATIC VALVE MANAGEMENT
DRIVER 59
10.1 DRIVER MODULE LEDS MEANING/WORKING 59

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10.2 UNIPOLAR/BIPOLAR VALVES DRIVER CONNECTION MODE 60
11. XEV20D ELECTRONIC THERMOSTATIC DRIVER WIRING
DIAGRAMS 61
11.1 XEV20D DRIVER MODEL HARDWARE RESOURCES 61
11.2 XEV20D DRIVER MODULE CONNECTION TO THE PROGRAMMABLE UNIT 62
11.3 NTC / PTC / PT1000 PROBE ANALOGUE INPUTS 63
11.4 0÷5V RATIOMETRIC PRESSURE TRANSDUCERS ANALOGUE INPUTS 63
11.5 4÷20MA PRESSURE TRANSDUCERS ANALOGUE INPUTS 63
12. RS485 SERIAL COMMUNICATION PERIPHERALS
CONNECTION 64
12.1 RS485 SERIAL LINE 64
12.2 RS485 MASTER SERIAL OUTPUT CONNECTION WITH MODBUS PROTOCOL 65
12.3 RS485 SLAVE SERIAL OUTPUT CONNECTION WITH MODBUS PROTOCOL 66
13. REMOTE CONNECTION VIA MODEM 67
13.1 PC CONNECTION FROM REMOTE VIA SERIAL OR EXTERNAL GSM MODEM 67
13.2 PC CONNECTION FROM REMOTE VIA INTERNAL SERIAL MODEM 68
14. CONNECTION TO THE IPRO.CHILL VIA THE NETWORK PORT 68
14.1 LOCAL CONNECTION TO THE PC 68
14.2 CONNECTION VIA INTRANET 69
14.3 CONNECTION VIA INTERNET 69
15. USING THE USB PORT 70
15.1 USB PORT (HOST) 70
16. USER INTERFACE 71
16.1 HOW TO MODIFY THE INFORMATION PRESENT IN THE MAIN SCREEN 72
16.2 UNIT SWITCH-ON IN CONDITIONING OR HEATING MODE 72
16.3 SET KEY 73
16.4 PROBES KEY 74
16.5 ALARM KEY 76
16.6 CIRC KEY 78
16.7 SERVICE KEY 80
16.7.1 Parameters programming ..........................................................................................................80
16.7.2 Time/Time bands.......................................................................................................................82
16.7.3 Compressors..............................................................................................................................83
16.7.4 Water pump ...............................................................................................................................83
16.7.5 Alarms display............................................................................................................................84
16.7.6 Historical alarms ........................................................................................................................84
16.7.7Defrost .......................................................................................................................................86
16.7.8 Heaters/Liquid line solenoid valve .............................................................................................86
16.7.9 I/O status....................................................................................................................................87
16.7.10 Thermostatic...........................................................................................................................87
16.7.11 Heat recovery .........................................................................................................................88
16.7.12 Auxiliary outputs .....................................................................................................................88
16.7.13 Free-cooling ...........................................................................................................................89
16.7.14 Screw compressor..................................................................................................................90
16.7.15 Control panel ..........................................................................................................................90
17. SELECTION –WORKING MODE –ENABLING –SWITCH-ON –
UNIT SWITCH OFF 91

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17.1 UNIT SWITCH-ON/OFF FROM THE KEYBOARD 91
17.2 UNIT SWITCH-ON/OFF FROM DIGITAL INPUT 91
17.3 SELECTING THE WORKING MODE: COOLING –HEATING 91
17.4 CHANGE OVER FUNCTION 92
17.5 COOLING –HEATING MODE SELECTION FROM KEYBOARD 93
17.6 COOLING –HEATING WORKING MODE SELECTION FROM ANALOGUE INPUT 93
18. WORKING WITH RTC 93
18.1 WORKING WITH CLOCK DISABLING DIGITAL INPUT 93
18.2 WORKING WITH “VENTILATION ONLY” DIGITAL INPUT (AIR-AIR UNIT ONLY) 93
18.3 WORKING WITH UNIT IN OFF FROM RTC IF ON IS FORCED FROM KEY 93
19. CONDENSING UNIT WORKING MODE 93
19.1 WORKING WITH DIGITAL INPUT CONFIGURED AS TEMPERATURE CONTROL REQUEST 94
19.2 WORKING WITH DIGITAL INPUT CONFIGURED AS COOLING REQUEST 94
19.3 WORKING WITH DIGITAL INPUT CONFIGURED AS HEATING REQUEST 94
20. COMPRESSORS TEMPERATURE CONTROL 94
20.1 COMPRESSOR TEMPERATURE CONTROL IN COOLING MODE 94
20.2 COMPRESSOR TEMPERATURE CONTROL IN HEATING MODE 95
20.3 TEMPERATURE CONTROL ON TWO INDEPENDENT CIRCUITS 95
21. CHOICE OF THE TYPE OF TEMPERATURE CONTROL 95
21.1 COMPRESSORS PROPORTIONAL TEMPERATURE CONTROL GRAPHICS (UNIT) 96
21.2 CIRCUIT N° 2 COMPRESSORS PROPORTIONAL TEMPERATURE CONTROL GRAPHICS 97
21.3 COMPRESSORS NEUTRAL ZONE TEMPERATURE CONTROL GRAPHICS 98
21.4 WORKING DESCRIPTION 99
22. NOTES COMPRESSORS TEMPERATURE CONTROL
WORKING 99
23. DYNAMIC SET-POINT FUNCTION 99
23.1 DYNAMIC SET-POINT WORKING GRAPHICS 100
24. ENERGY SAVING FROM ID FUNCTION 100
25. ENERGY SAVING FUNCTION AND TIMED SWITCH-ON AND
SWITCH-OFF 100
25.1 ENABLES THE DAILY/WEEKLY WORKING IN ENERGY SAVING AND AUTOMATIC SWITCH-
ON/OFF MODE 100
26. COMPRESSORS TEMPERATURE CONTROL ROTATION
CONTROL 101
26.1 FIXED SEQUENCE IN SELECTION OF THE CIRCUITS 101
26.2 FIXED SEQUENCE INSIDE THE CIRCUIT 101
26.3 COMPRESSOR FIFO ROTATION 101
26.4 CIRCUIT FIFO ROTATION 101
26.5 SELECTION OF THE CIRCUIT FOR BALANCING 101
26.6 SELECTION OF THE COMPRESSOR FOR BALANCING 101
26.7 SELECTION OF THE CIRCUIT FOR SATURATION 102
26.8 SELECTION OF THE COMPRESSOR FOR SATURATION 102

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26.9 SELECTION OF COMPRESSORS IN THE CIRCUIT ON THE BASIS OF "COMPRESSOR
WEIGHT" 102
26.10 SELECTION OF THE CIRCUIT ON THE BASIS OF "COMPRESSOR WEIGHT" (NOT AVAILABLE
FUNCTION) 102
27. COMPRESSORS SWITCH-ON 103
27.1 DESCRIPTION OF DIRECT START-UP 103
27.2 DIRECT START-UP 103
27.3 DIRECT START-UP OF A PARTIALISED COMPRESSOR 103
27.4 DESCRIPTION OF PART WINDING START-UP 104
27.5 PART WINDING START-UP OF A COMPRESSOR 104
27.6 PART WINDING START-UP OF A COMPRESSOR/S WITH 1 OR MORE PARTIALISATIONS 104
27.7 DESCRIPTION OF STAR DELTA START-UP 104
27.8 STAR DELTA START-UP OF A COMPRESSOR 104
27.9 STAR DELTA START-UP OF A PARTIALISED COMPRESSOR 105
28. PARTIALISATIONS WORKING 105
28.1 START-UP WITH PARTIALISED COMPRESSOR / IDLE START-UP 107
28.2 GAS BY-PASS VALVE FUNCTION ON COMPRESSOR START-UP 107
28.3 INTERMITTENT VALVE FUNCTION FOR SCREW COMPRESSORS 107
29. COMPRESSOR LIQUID INJECTION SOLENOID VALVE
FUNCTION 108
29.1 WORKING 108
30. COMPRESSOR WITH INVERTER MANAGEMENT (FUNCTION
NOT AVAILABLE) 108
31. MANAGEMENT OF THE TEMPERATURE CONTROL OF
COMPRESSORS WITH DIFFERENT COOLING CAPACITY (
FUNCTION NOT AVAILABLE) 109
32. COMPRESSORS IN TANDEM 110
33. COMPRESSORS MAINTENANCE REQUEST FUNCTION 110
34. EVAPORATOR WATER PUMP WORKING 110
34.1 ONLY ONE RELAY CONFIGURED AS EVAPORATOR WATER PUMP 110
35. EVAPORATOR WATER PUMP ROTATION 111
35.1 2 RELAYS CONFIGURED AS EVAPORATOR WATER PUMP 111
35.2 ROTATION OF THE EVAPORATOR WATER PUMPS FROM DIGITAL INPUT 111
36. EVAPORATOR PUMP ANTI-FREEZE MANAGEMENT 111
37. WATER PUMP MAINTENANCE REQUEST FUNCTION 112
38. SUPPLY FAN WORKING 112

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38.1 SUPPLY FAN DURING DEFROST 112
38.2 HOT START FUNCTION 113
39. FUNCTION OF SUPPLY FAN MAINTENANCE REQUEST 113
40. CONDENSER WATER PUMP WORKING 113
40.1 ONLY ONE RELAY CONFIGURED AS CONDENSER WATER PUMP 113
41. CONDENSER WATER PUMP ROTATION 114
41.1 2 RELAYS CONFIGURED AS CONDENSER WATER PUMP 114
41.2 ROTATION OF THE CONDENSER WATER PUMPS FROM DIGITAL INPUT 114
42. CONDENSER PUMP ANTI-FREEZE MANAGEMENT 114
43. WATER PUMP MAINTENANCE REQUEST FUNCTION 115
44. SWITCH-ON/OFF WORKING WITH PUMP-DOWN 115
44.1 PUMP-DOWN FUNCTION WITH CIRCUIT LOW PRESSURE PRESSURE SWITCH 116
44.2 PUMP-DOWN FUNCTION WITH DEDICATED PRESSURE SWITCH 116
44.3 PUMP-DOWN FUNCTION FROM ANALOGUE INPUT 116
44.4 PUMP-DOWN FUNCTION IN COOLING MODE ONLY (Configuration possible only for reversible
units with the enabling of the working of the compressors in heating mode). 116
44.5 LOW PRESSURE ALARM DURING THE PUMP-DOWN 116
44.6 WORKING EXAMPLES: 117
44.6.1 Pump-down active only in switch-off based on LP pressure switch.........................................117
44.6.2 Pump-down active in switch-off and re-start, based on dedicated pressure switch. Pump-down
pressure switch intervention threshold higher than the intervention threshold of the LP pressure switch.117
44.6.3 Pump-down active in switch-off and re-start, based on dedicated pressure switch. Pump-down
pressure switch intervention threshold lower than the intervention threshold of the LP pressure switch.117
44.6.4 Pump-down active in shut-down and in re-start, based on the analogue input relative to the
evaporation pressure..............................................................................................................................118
44.7 TIMED PUMP DOWN FUNCTION 118
44.8 PUMP DOWN ALARM IN START-UP AND STOPPING 118
45. CIRCUITS UNLOADING 119
45.1 UNLOADING FROM CONDENSATION HIGH TEMPERATURE PROBE 119
45.2 UNLOADING FROM CONDENSATION HIGH TEMPERATURE TRANSDUCER 120
45.3 UNLOADING BY LOW PRESSURE TRANSDUCER 121
45.4 UNLOADING DUE TO EVAPORATOR WATER INLET HIGH TEMPERATURE 121
45.5 EVAPORATOR WATER LOW TEMPERATURE UNLOADING (NO AIR-AIR) 121
45.6 WORKING IN UNLOADING MODE NOTES 122
46. CONDENSATION FANS REGULATOR 122
46.1 IF THE PWM/ 0÷10V SIGNAL TRIAC OUTPUT IS USED 123
46.2 IF THE STEP RELAY OUTPUTS ARE USED 123
46.3 UNIQUE OR SEPARATE CONDENSATION 124
46.4 PROPORTIONAL FAN REGULATOR GRAPHICS 125
46.5 CONDENSATION FAN REGULATOR ON / OFF IN COOLING MODE GRAPHICS 125
46.6 CONDENSATION FAN REGULATOR ON / OFF IN HEATING MODE GRAPHICS 125
47. ANTI-FREEZE/SUPPORT HEATERS REGULATOR 126
47.1 HEATER OUTPUT WORKING IN COOLING OR HEATING MODE 126
47.2 TEMPERATURE CONTROL IN COOLING MODE 126

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47.3 TEMPERATURE CONTROL IN HEATING MODE 126
47.4 TEMPERATURE CONTROL OF THE AIR/AIR UNIT HEATERS 126
47.5 SUPPORT/ANTI-FREEZE/BOILER HEATERS WORKING GRAPHICS 127
47.6 TEMPERATURE CONTROL OF THE EVAPORATOR ANTI-FREEZE HEATERS 127
47.7 TEMPERATURE CONTROL OF THE CONDENSER ANTI-FREEZE HEATERS 127
47.8 TEMPERATURE CONTROL OF THE BOILER HEATERS (ANTI-FREEZE) BOILER FUNCTION 128
48. ANTI-FREEZE HEATERS WORKING FROM DIGITAL INPUT 129
49. DEFROST FUNCTION 129
49.1 DESCRIPTION OF DEFROST PARAMETERS 132
49.2 DEFROST WITH CONDENSATION FANS 134
49.3 SUPPLY FAN DURING DEFROST 134
50. RECOVERY FUNCTION 134
51. HEAT RECOVERY WORKING FROM DIGITAL INPUT 135
51.1 UNIT WITH SEPARATE HYDRAULIC CIRCUITS 135
51.2 UNIT WITH TWO PARALLEL HYDRAULIC CIRCUITS 136
52. HEAT RECOVERY WORKING BY MEANS OF TEMPERATURE
PROBE 138
52.1 USER SIDE PRIORITY 138
52.2 HEAT RECOVERY SIDE PRIORITY 139
53. FUNCTION FOR PRODUCTION OF DOMESTIC HOT WATER 140
53.1 MANAGEMENT OF THE DOMESTIC HOT WATER PUMP 141
53.1.1 CONTINUOUS WORKING OF THE DOMESTIC HOT WATER PUMP ..................................142
53.2 ANTILEGIONELLA FUNCTION 142
53.3 MANAGEMENT OF THE PRIORITY BETWEEN THE PRODUCTION OF DOMESTIC HOT WATER
AND WATER CIRCUIT UTILITIES 142
53.4 SOLAR PANELS WATER PUMP 143
53.5 DOMESTIC HOT WATER FLOW SWITCH AND SOLAR PANELS MANAGEMENT 143
53.6 PRODUCTION OF DOMESTIC HOT WATER WITH AIR/WATER UNIT, WATER/WATER IN
HEATING AND COMMON RETURN MODE: CF01=1,2 - CF02=3 -FS01=1 143
53.6.1 DOMESTIC HOT WATER DURING WORKING IN WINTER MODE ......................................143
53.6.2 DOMESTIC HOT WATER IN SUMMER CYCLE (ONLY UNITS WITH CF02=3)....................143
53.6.3 DEFROST OF THE AIR-WATER UNITS (ONLY WITH CF02=2 O CF02=3)..........................144
53.7 PRODUCTION OF DOMESTIC HOT WATER WITH AIR/WATER UNIT, WATER/WATER IN
HEATING AND DEDICATED RETURN MODE: CF01=1,2 -CF02=3 - FS01=2 144
53.7.1 DOMESTIC HOT WATER DURING WORKING IN WINTER MODE ......................................144
53.7.2 DEFROST OF THE AIR-WATER UNITS (ONLY WITH CF02=2 O CF02=3)..........................144
53.7.3 PRODUCTION OF DOMESTIC HOT WATER DURING WORKING IN SUMMER CYCLE
(ONLY UNITS WITH CF02 =3) ..............................................................................................................145
53.7.4 MANAGEMENT OF THE REFRIGERANT LOAD IN THE CASE OF DOMESTIC HOT WATER
PRODUCTION IN THE SUMMER CYCLE ............................................................................................146
54. FREE COOLING 147
54.1 RESOURCES TO BE CONFIGURED 147
54.1.1 ANALOGUE INPUTS ...............................................................................................................147
54.1.2 DIGITAL OUTPUTS.................................................................................................................147
54.1.3 ANALOGUE OUTPUTS...........................................................................................................147
54.2 FREE-COOLING WITH INTERNAL FAN LAYOUT 147
54.3 FREE-COOLING WITH EXTERNAL VENTILATION LAYOUT 148

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54.4 WORKING 148
54.5 FREE-COOLING WORKING IN HEATING MODE 149
54.6 ANTI-FREEZE ALARM PREVENTION 149
54.7 FREE COOLING VENTILATION WORKING MODE 150
54.8 FRACTIONED BATTERY 150
55. AUXILIARY RELAY FUNCTION 151
55.1 DIRECT ACTION WORKING ENABLED 151
55.2 REVERSE ACTION WORKING ENABLED 151
56. WORKING OF THE AUXILIARY ANALOGUE OUTPUTS (0÷10
VOLT) 152
57. ALARMS 153
57.1 COMPRESSORS BLOCK ALARMS 153
57.2 PROBE BREAKDOWN 154
57.3 HIGH PRESSURE PRESSURE SWITCH ALARM 154
57.4 COMPRESSOR FLOW HIGH TEMPERATURE ALARM FROM DIGITAL INPUT 155
57.5 LOW PRESSURE PRESSURE SWITCH ALARM 156
57.6 OIL FLOAT/PRESSURE SWITCH ALARM 157
57.7 CONDENSATION TEMPERATURE/HIGH PRESSURE ALARM 158
57.8 LOW CONDENSATION TEMPERATURE/PRESSURE (IF THE LOW PRESSURE
TRANSDUCERS ARE NOT USED) 159
57.9 LOW EVAPORATION PRESSURE IF THE LOW PRESSURE TRANSDUCERS ARE USED 160
57.10 AIR/AIR UNIT EVAPORATOR/CONDENSER AIR OUTLET LOW TEMPERATURE IN COOLING
WORKING MODE ANTI-FREEZE ALARM 161
57.11 AIR/AIR UNIT EVAPORATOR/CONDENSER AIR OUTLET LOW TEMPERATURE IN HEATING
WORKING MODE ANTI-FREEZE ALARM 162
57.12 COLD SIDE FLOW SWITCH ALARM (DIFFERENTIAL PRESSURE SWITCH) 163
57.13 HOT SIDE FLOW SWITCH ALARM (DIFFERENTIAL PRESSURE SWITCH) 164
57.14 SUPPLY FAN CIRCUIT BREAKER ALARM 166
57.15 DOMESTIC HOT WATER PUMP FLOW SWITCH ALARM 167
57.16 DOMESTIC SOLAR PANELS WATER PUMP FLOW SWITCH ALARM 167
57.17 CIRCUIT BREAKER ALARM 168
57.18 DISCHARGE COMPRESSORS HIGH TEMPERATURE ALARM FROM ANALOGUE INPUT 169
57.19 EVAPORATOR WATER INLET HIGH TEMPERATURE ALARM 169
57.20 CONDENSATION FAN CIRCUIT BREAKER ALARM 170
57.21 DEFROST ALARM 171
57.22 UNLOADING SIGNAL DUE TO HIGH CONDENSATION TEMPERATURE/PRESSURE IN
COOLING WORKING MODE 172
57.23 HEAT RECOVERY DISABLING SIGNAL DUE TO HIGH CONDENSATION
TEMPERATURE/PRESSURE IN COOLING WORKING MODE 173
57.24 UNLOADING SIGNAL DUE TO LOW EVAPORATION PRESSURE IN HEATING WORKING MODE174
57.25 UNLOADING SIGNAL DUE TO EVAPORATOR WATER INLET HIGH TEMPERATURE 175
57.26 PUMP DOWN ALARM WITH LOW PRESSURE PRESSURE SWITCH/TRANSDUCER IN
STOPPING 176
57.27 PUMP DOWN ALARM WITH LOW PRESSURE TRANSDUCER IN START-UP 177
57.28 EVAPORATOR WATER PUMPING UNIT CIRCUIT BREAKER ALARM 178
57.29 HEAT RECOVERY CONDENSER WATER PUMPING UNIT CIRCUIT BREAKER ALARM 179
57.30 UNIT N. 1 BLOCK GENERAL ALARM 179
57.31 UNIT N. 2 BLOCK GENERAL ALARM 180
57.32 COMPRESSORS MAINTENANCE ALARM 181
57.33 FLOW FAN PUMPS MAINTENANCE ALARM 181
57.34 CONDENSER PUMPS MAINTENANCE ALARM 181
57.35 RTC ALARM 182
57.36 RTF ALARM 182
57.37 EEPROM ALARM 182
57.38 NETWORK FREQUENCY ALARM 183

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UNIT CONFIGURATION 184
57.39 184
57.40 REMOTE TERMINAL ALARM 187
57.41 NOTE: ALARM RELAY AND BUZZER 187
58. NO VOLTAGE 187
59. AUTOMATIC TO MANUAL RESRT ALARMS DIAGNOSTICS 187
60. OUTPUTS BLOCK TABLE 188
60.1 CIRCUIT “A” OUTPUTS ALARM BLOCK TABLE 188
60.2 CIRCUIT “B” OUTPUTS ALARM BLOCK TABLE 189
60.3 COMPRESSOR "C" ALARMS OUTPUTS BLOCK TABLE 190

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1. GENERAL RECOMMENDATIONS
To be read before further use of the unit.
•This manual constitutes an integral part of the product and must be kept near to the appliance for easy
and quick consultation.
•The regulator must not be used with functions different to those described below. In particular, it cannot
be used as a safety device.
•Before proceeding, check the limits of application.
1.1 SAFETY PRECAUTIONS
•Check the power supply voltage is correct before connecting the device.
•Only expose the front panel of the device to atmospheric agents: front protection with IP65 rating with rear
gasket. Only use the regulator within its working limits.
•Warning: Disconnect any electric connections before performing any type of maintenance.
•The device must never be opened.
•In the case of malworking or fault, send the device back to "DIXELL s.r.l. (see address) with a precise
description of the problem.
•Consider the maximum current applicable to each relay (see Technical Data).
•Make sure that the probe cables, the regulator power supply cables and the load cables remain separate
and sufficiently distant from each other, without crossing each other or forming coils.
•Install the probes in a way that they are not accessible to any users.
•In the case of applications in particularly critical industrial environments, it may be useful to also use
network filters (our mod. FT-PW network filter), (our mod. FT-IL filter to be connected in parallel to the
inductive loads).

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2. GENERALITIES
iPro.CHILL is a programmable controller for application on Air Conditioning units up to 4 circuits and 4
compressors per circuit.
It is possible to manage the following units:
•Air/air
•Air/water
•Water/water
•Condensing Units
All types with:
•Heating with gas reversibility
•Free cooling function
•Recovery function
•Domestic hot water function
2.1 MAIN FUNCTIONS
Management of the cooling unit with:
•Single-circuit up to four compressors
•Four circuits with odd number of compressors among the circuits
•Four circuits up to 16 compressors
•Screw compressors
Start-up of configurable compressors:
•Direct
•Part winding
•Star delta
Compressor management with inverter (Not Available):
•1 compressor per circuit
Configurable soft start-ups:
•Start-up with unloading valve
•Idle running valve
•Gas by-pass valve outside the compressor
Unloaders management:
•continuous working
•step working
•modulating working (screw compressors)
Compressors rotation and temperature control configurable from parameter:
•by n° of running hours
•by n° start-up hour
Compressors liquid injection function
•Control with dedicated PTC probe
Compressors discharge high temperature alarm function
•Control with dedicated PTC probe
Complete management of two water side pumping units:
•2 pumps evaporator side
•2 pumps condenser side
Customised default display of all variables
•Temperatures
•Pressures
Other displays available
•Status of the digital inputs
•Compressor running hours
•N° compressor start-ups
•Evaporator/condenser water pump running hours
•Time remaining before defrost
•Percentage of the proportional outputs
•Compressors discharge temperature
Reset alarms using customised password
•Historical alarms
•Compressor thermal overload alarms
Possibility of enabling/disabling the individual circuit

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•Allows maintenance of the circuit
•Allows "partialised" working of the unit
Possibility of enabling/disabling the individual compressor
•Maintenance of the individual compressor
•Malfunction
Complete management of pump down function:
•With dedicated pressure switch
•Timed
•Via the low pressure switch
•Via the low pressure transducer
Circuit unloading function:
•From evaporator inlet high water temperature
•From condenser inlet high water temperature (unit with heat recovery) – Not Available
•From high condensing pressure
•From low evaporating pressure
Controlled loads maintenance signal function:
•Compressors
•Evaporator pumps
•Condenser pump
Circuit auxiliary relay function:
•Four completely configurable relay outputs, also released from normal working of the unit controlled,
managed by means of NTC or PTC temperature probes or with 4÷20mA –0.5 Volt pressure transducer
Weekly working in energy saving mode:
•Up to three daily time bands (devices with RTC option)
•From digital input
Weekly working with automatic switch on and switch off:
•Up to three daily time bands (devices with RTC option)
Dynamic set-point function:
•Managed by NTC or 4÷20mA input
Changeover function:
•Automatic changeover between cooling and heating by NTC input
Remote OFF function:
•From configurable digital input
Remote heating cooling function:
•From digital input with configurable logic
Hot start function:
•Air/air unit
Defrost management:
•In temperature in pressure or with both (combined control)
•Forced defrost for start-up with low external air temperatures
•From digital input or timed
•Manual using the relevant key
Boiler function:
•With integration heaters
N° 2 outputs for the proportional control of the condensing fan speeds via external module (inverter
or single/three phase phase cut) with configurable signal:
•PWM
•0÷10 Volt
•4÷20 mA
N° 6 outputs for 0÷10V proportional or ON/OFF control
•To control the servomotors working in free cooling or heat recovery mode
•For driving an external relay
Complete alarms management
•With internal data logger alarms (up to 100 events)
Up to n° 2 programmable remote LCD terminals with customisable values display
•with NTC probe on board for room temperature display and temperature control (Not Available).
Supervision/tele-assistance/remote monitoring for complete control and supervision from local and
remote
•By means of network output with ModBus TCP / IP protocol (INTERNET / INTRANET)
•Directly by telephone line (MODEL WITH INTERNAL MODEM)
•Indirectly by means of GSM modem or XWEB serial modem (MODEL WITH RS232 OUTPUT
PREPARATION)

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•Via RS485 slave output with ModBus protocol to Dixell XWEB300D / XWEB500D supervision systems
3. IPC400D SERIES FEATURES
FEATURES
IPC410D
IPC415D
POWER SUPPLY
24 VAC/DC (± 10%)
n
n
RELAY OUTPUTS
10
n
15
n
DIGITAL INPUTS
20 Configurable
20 Configurable
PROBE INPUTS
10 Configurable
10 Configurable
PROPORTIONAL OUTPUTS
outputs for condensing fan modules (PWM signal)
2 Configurable
2 Configurable
0÷10V analogue outputs for free-cooling management
and heat recovery or ON/OFF for driving external relay
4
4
FURTHER CONNECTIONS
1/ RS485 Master with Modbus Rtu protocol
1
1
1/ RS485 Slave with Modbus Rtu protocol
1
1
VGIPC keyboard output (up to 2 remote terminals with
probe on board)
Up to 2
Up to 2
Network outputs (Internet / intranet)
Opt. (enabling)
Opt. (enabling)
CANbus output
n
n
USB port (host)
n
n
OTHER
Buzzer
n
n
Internal real time clock RTC
n
n
!Config. = configurable from parameter
!Opt = optional
!n= standard

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USER MANUAL – Release 1.2 of 01/01/2010 Page 14 of 191
Version: 02/03/2010
4. ANALOGUE - DIGITAL INPUTS/OUTPUTS CONFIGURATIONS
4.1 ID1 –ID20 DIGITAL INPUTS CONFIGURATION
0. Disabled
1. Remote ON/OFF
2. Remote cooling/heating
3. Evaporator flow switch
4. Condenser flow switch
5. Sanitary water flow switch
6. Antifreeze alarm circuit 1
7. Antifreeze alarm circuit 2
8. Antifreeze alarm circuit 3
9. Antifreeze alarm circuit 4
10. High pressure switch circuit 1
11. High pressure switch circuit 2
12. High pressure switch circuit 3
13. High pressure switch circuit 4
14. Low pressure switch circuit 1
15. Low pressure switch circuit 2
16. Low pressure switch circuit 3
17. Low pressure switch circuit 4
18. Compressor 1 discharge thermostat
19. Compressor 2 discharge thermostat
20. Compressor 3 discharge thermostat
21. Compressor 4 discharge thermostat
22. Compressor 5 discharge thermostat
23. Compressor 6 discharge thermostat
24. Compressor 7 discharge thermostat
25. Compressor 8 discharge thermostat
26. Compressor 9 discharge thermostat
27. Compressor 10 discharge thermostat
28. Compressor 11 discharge thermostat
29. Compressor 12 discharge thermostat
30. Compressor 13 discharge thermostat
31. Compressor 14 discharge thermostat
32. Compressor 15 discharge thermostat
33. Compressor 16 discharge thermostat
34. Compressor 1 thermal overload
35. Compressor 2 thermal overload
36. Compressor 3 thermal overload
37. Compressor 4 thermal overload
38. Compressor 5 thermal overload
39. Compressor 6 thermal overload
40. Compressor 7 thermal overload
41. Compressor 8 thermal overload
42. Compressor 9 thermal overload
43. Compressor 10 thermal overload
44. Compressor 11 thermal overload
45. Compressor 12 thermal overload
46. Compressor 13 thermal overload
47. Compressor 14 thermal overload
48. Compressor 15 thermal overload
49. Compressor 16 thermal overload
50. Fan Overload Circuit 1
51. Fan Overload Circuit 2
52. Fan Overload Circuit 3
53. Fan Overload Circuit 4
54. Fan Overload Circuit 1/2
55. Fan Overload Circuit 3/4
56. Evaporator main pump / Supply fan Overload

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USER MANUAL – Release 1.2 of 01/01/2010 Page 15 of 191
Version: 02/03/2010
57. Evaporator support pump Overload
58. Condenser main pump Overload
59. Condenser support pump Overload
60. Circuit 1 heat recovery request
61. Circuit 2 heat recovery request
62. Circuit 3 heat recovery request
63. Circuit 4 heat recovery request
64. End of circuit 1 defrost
65. End of circuit 2 defrost
66. End of circuit 3 defrost
67. End of circuit 4 defrost
68. Energy Saving
69. Oil pressure/level switch compressor 1
70. Oil pressure/level switch compressor 2
71. Oil pressure/level switch compressor 3
72. Oil pressure/level switch compressor 4
73. Oil pressure/level switch compressor 5
74. Oil pressure/level switch compressor 6
75. Oil pressure/level switch compressor 7
76. Oil pressure/level switch compressor 8
77. Oil pressure/level switch compressor 9
78. Oil pressure/level switch compressor 10
79. Oil pressure/level switch compressor 11
80. Oil pressure/level switch compressor 12
81. Oil pressure/level switch compressor 13
82. Oil pressure/level switch compressor 14
83. Oil pressure/level switch compressor 15
84. Oil pressure/level switch compressor 16
85. Circuit 1 pump down pressure switch
86. Circuit 2 pump down pressure switch
87. Circuit 3 pump down pressure switch
88. Circuit 4 pump down pressure switch
89. Generic alarm 1 digital input
90. Generic alarm 2 digital input
91. Digital input working in RTC automatic enabling (time band)/manual (keyboard) mode
92. Digital input working with supply fan only
93. Cooling/Heating demand digital input (condensing unit)
94. Cooling demand digital input (condensing unit)
95. Heating demand digital input (condensing unit)
96. Capacity step 1 demand digital input (condensing unit)
97. Capacity step 2 demand digital input (condensing unit)
98. Capacity step 3 demand digital input (condensing unit)
99. Capacity step 4 demand digital input (condensing unit)
100. Capacity step 5 demand digital input (condensing unit)
101. Capacity step 6 demand digital input (condensing unit)
102. Capacity step 7 demand digital input (condensing unit)
103. Capacity step 8 demand digital input (condensing unit)
104. Capacity step 9 demand digital input (condensing unit)
105. Capacity step 10 demand digital input (condensing unit)
106. Capacity step 11 demand digital input (condensing unit)
107. Capacity step 12 demand digital input (condensing unit)
108. Capacity step 13 demand digital input (condensing unit)
109. Capacity step 14 demand digital input (condensing unit)
110. Capacity step 15 demand digital input (condensing unit)
111. Capacity step 16 demand digital input (condensing unit)
112. Solar panels flow switch
113. Phase sequence relay

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USER MANUAL – Release 1.2 of 01/01/2010 Page 16 of 191
Version: 02/03/2010
4.2 RL1-RL15 DIGITAL OUTPUTS CONFIGURATION
0. Disabled
1. Alarm
2. Evaporator main pump/supply fan
3. Evaporator support pump
4. Antifreeze heaters / support / boiler 1st step
5. Antifreeze heaters / support / boiler 2nd step
6. Antifreeze heaters / support / boiler 3rd step
7. Antifreeze heaters / support / boiler 4th step
8. Heat recovery condenser main pump
9. Heat recovery condenser support water pump
10. Cycle inversion valve circuit 1
11. Cycle inversion valve circuit 2
12. Cycle inversion valve circuit 3
13. Cycle inversion valve circuit 4
14. Circuit 1 ON/OFF Fan 1st step
15. Circuit 1 ON/OFF Fan 2nd step
16. Circuit 1 ON/OFF Fan 3rdstep
17. Circuit 1 ON/OFF Fan 4th step
18. Circuit 2ON/OFF Fan 1st step
19. Circuit 2ON/OFF Fan 2nd step
20. Circuit 2ON/OFF Fan 3rdstep
21. Circuit 2ON/OFF Fan 4th step
22. Circuit 3ON/OFF Fan 1st step
23. Circuit 3ON/OFF Fan 2nd step
24. Circuit 3ON/OFF Fan 3rdstep
25. Circuit 3ON/OFF Fan 4th step
26. Circuit 4ON/OFF Fan 1st step
27. Circuit 4ON/OFF Fan 2nd step
28. Circuit 4ON/OFF Fan 3rdstep
29. Circuit 4ON/OFF Fan 4th step
30. Circuit 1 pump down solenoid valve
31. Circuit 2 pump down solenoid valve
32. Circuit 3 pump down solenoid valve
33. Circuit 4 pump down solenoid valve
34. Circuit 1 heat recovery valve
35. Circuit 2 heat recovery valve
36. Circuit 3 heat recovery valve
37. Circuit 4 heat recovery valve
38. Free-cooling ON/OFF valve
39. Free-cooling ON/OFF fan
40. Circuit 1 1st step split coil
41. Circuit 1 2ndstep split coil
42. Circuit 21st step split coil
43. Circuit 22ndstep split coil
44. Circuit 31st step split coil
45. Circuit 32ndstep split coil
46. Circuit 41st step split coil
47. Circuit 52ndstep split coil
48. Auxiliary output n° 1
49. Auxiliary output n° 2
50. Auxiliary output n° 3
51. Auxiliary output n° 4
52. (Screw) Compressor 1 intermittent valve
53. (Screw) Compressor 2intermittent valve
54. (Screw) Compressor 3intermittent valve
55. (Screw) Compressor 4intermittent valve
56. (Screw) Compressor 5intermittent valve
57. (Screw) Compressor 6intermittent valve
58. (Screw) Compressor 7intermittent valve
59. (Screw) Compressor 8intermittent valve

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USER MANUAL – Release 1.2 of 01/01/2010 Page 17 of 191
Version: 02/03/2010
60. Compressor 1 liquid injection solenoid valve
61. Compressor 2 liquid injection solenoid valve
62. Compressor 3 liquid injection solenoid valve
63. Compressor 4 liquid injection solenoid valve
64. Compressor 5 liquid injection solenoid valve
65. Compressor 6 liquid injection solenoid valve
66. Compressor 7 liquid injection solenoid valve
67. Compressor 8 liquid injection solenoid valve
68. Domestic hot water valve 1
69. Domestic hot water valve 2
70. Domestic hot water heater (1st step)
71. Domestic hot water heater (2nd step)
72. Domestic hot water heater (3rd step)
73. Solar panels pump
74. Solar coil enabling/exclusion ON/OFF valve
75. Domestic hot water pump
76. Compressor 1 Direct start-up
Compressor 1 Winding 1 Part Winding start-up
Compressor 1 Line 1 Star Delta start-up
77. Compressor 1 Winding 2 Part Winding start-up
Compressor 1 Line 2 Star Delta start-up
78. Compressor 1 Star Delta start-up: Star centre
79. Compressor 1 Unloader 1
80. Compressor 1 Unloader 2
81. Compressor 1 Unloader 3
82. Compressor 1 Unloader 4
83. Compressor 1 gas by-pass valve during start-up
84. Compressor 2 Direct start-up
Compressor 2 Winding 1 Part Winding start-up
Compressor 2 Line 1 Star Delta start-up
85. Compressor 2 Winding 2 Part Winding start-up
Compressor 2 Line 2 Star Delta start-up
86. Compressor 2Star Delta start-up: Star centre
87. Compressor 2 Unloader 1
88. Compressor 2 Unloader 2
89. Compressor 2 Unloader 3
90. Compressor 2 Unloader 4
91. Compressor 2gas by-pass valve during start-up
92. Compressor 3 Direct start-up
Compressor 3 Winding 1 Part Winding start-up
Compressor 3 Line 1 Star Delta start-up
93. Compressor 3 Winding 2 Part Winding start-up
Compressor 3 Line 2 Star Delta start-up
94. Compressor 3 Star Delta start-up: Star centre
95. Compressor 3 Unloader 1
96. Compressor 3 Unloader 2
97. Compressor 3 Unloader 3
98. Compressor 3 Unloader 4
99. Compressor 3gas by-pass valve during start-up
100. Compressor 4 Direct start-up
Compressor 4 Winding 1 Part Winding start-up
Compressor 4 Line 1 Star Delta start-up
101. Compressor 4 Winding 2 Part Winding start-up
Compressor 4 Line 2 Star Delta start-up
102. Compressor 4 Star Delta start-up: Star centre
103. Compressor 4 Unloader 1
104. Compressor 4 Unloader 2
105. Compressor 4 Unloader 3
106. Compressor 4 Unloader 4
107. Compressor 4gas by-pass valve during start-up

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USER MANUAL – Release 1.2 of 01/01/2010 Page 18 of 191
Version: 02/03/2010
108. Compressor 5 Direct start-up
Compressor 5 Winding 1 Part Winding start-up
Compressor 5 Line 1 Star Delta start-up
109. Compressor 5 Winding 2 Part Winding start-up
Compressor 5 Line 2 Star Delta start-up
110. Compressor 5 Star Delta start-up: Star centre
111. Compressor 5 Unloader 1
112. Compressor 5 Unloader 2
113. Compressor 5 Unloader 3
114. Compressor 5 Unloader 4
115. Compressor 5gas by-pass valve during start-up
116. Compressor 6 Direct start-up
Compressor 6 Winding 1 Part Winding start-up
Compressor 6 Line 1 Star Delta start-up
117. Compressor 6 Winding 2 Part Winding start-up
Compressor 6 Line 2 Star Delta start-up
118. Compressor 6 Star Delta start-up: Star centre
119. Compressor 6 Unloader 1
120. Compressor 6 Unloader 2
121. Compressor 6 Unloader 3
122. Compressor 6 Unloader 4
123. Compressor 6gas by-pass valve during start-up
124. Compressor 7 Direct start-up
Compressor 7 Winding 1 Part Winding start-up
Compressor 7 Line 1 Star Delta start-up
125. Compressor 7 Winding 2 Part Winding start-up
Compressor 7 Line 2 Star Delta start-up
126. Compressor 7 Star Delta start-up: Star centre
127. Compressor 7 Unloader 1
128. Compressor 7 Unloader 2
129. Compressor 7 Unloader 3
130. Compressor 7 Unloader 4
131. Compressor 7gas by-pass valve during start-up
132. Compressor 8 Direct start-up
Compressor 8 Winding 1 Part Winding start-up
Compressor 8 Line 1 Star Delta start-up
133. Compressor 8 Winding 2 Part Winding start-up
Compressor 8 Line 2 Star Delta start-up
134. Compressor 8 Star Delta start-up: Star centre
135. Compressor 8 Unloader 1
136. Compressor 8 Unloader 2
137. Compressor 8 Unloader 3
138. Compressor 8 Unloader 4
139. Compressor 8gas by-pass valve during start-up
140. Compressor 9 Direct start-up
141. Compressor 10 Direct start-up
142. Compressor 11 Direct start-up
143. Compressor 12 Direct start-up
144. Compressor 13 Direct start-up
145. Compressor 14 Direct start-up
146. Compressor 15 Direct start-up
147. Compressor 16 Direct start-up
148. Charge modulating valve circuit 1
149. Charge modulating valve circuit 2
150. Charge modulating valve circuit 3
151. Charge modulating valve circuit 4
152. Unit enabled
153. APS Alarm (Phase sequence)
154. HP1 Alarm (High pressure circuit 1)
155. HP2 Alarm (High pressure circuit 2)
156. HP3 Alarm (High pressure circuit 3)
157. HP4 Alarm (High pressure circuit 4)

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USER MANUAL – Release 1.2 of 01/01/2010 Page 19 of 191
Version: 02/03/2010
158. LP1 Alarm (Low pressure circuit 1)
159. LP2 Alarm (Low pressure circuit 2)
160. LP3 Alarm (Low pressure circuit 3)
161. LP4 Alarm (Low pressure circuit 4)
162. AEFL Alarm (Evaporator Flow)
163. ACFL Alarm (Condenser Flow)
164. AHFL Alarm (Domestic Water Flow)
165. APFL Alarm (Solar Panels Flow)
166. ALC1 Alarm (Unit Block #1)
167. ALC2 Alarm (Unit Block #1)
168. C1tr Alarm (Overload Compressor 1)
169. C2tr Alarm (Overload Compressor 2)
170. C3tr Alarm (Overload Compressor 3)
171. C4tr Alarm (Overload Compressor 4)
172. C5tr Alarm (Overload Compressor 5)
173. C6tr Alarm (Overload Compressor 6)
174. C7tr Alarm (Overload Compressor 7)
175. C8tr Alarm (Overload Compressor 8)
176. C9tr Alarm (Overload Compressor 9)
177. C10tr Alarm (Overload Compressor 10)
178. C11tr Alarm (Overload Compressor 11)
179. C12tr Alarm (Overload Compressor 12)
180. C13tr Alarm (Overload Compressor 13)
181. C14tr Alarm (Overload Compressor 14)
182. C15tr Alarm (Overload Compressor 15)
183. C16tr Alarm (Overload Compressor 16)
184. B1A Alarm (Anti-freeze Circuit 1)
185. B2A Alarm (Anti-freeze Circuit 2)
186. B3A Alarm (Anti-freeze Circuit 3)
187. B4A Alarm (Anti-freeze Circuit 4)

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USER MANUAL – Release 1.2 of 01/01/2010 Page 20 of 191
Version: 02/03/2010
4.3 ANALOGUE INPUTS PB1 -PB10 CONFIGURATION
0. Disabled
1. Compressor 1 PTC discharge temperature probe
2. Compressor 2 PTC discharge temperature probe
3. Compressor 3 PTC discharge temperature probe
4. Compressor 4 PTC discharge temperature probe
5. Compressor 5 PTC discharge temperature probe
6. Compressor 6 PTC discharge temperature probe
7. Compressor 7 PTC discharge temperature probe
8. Compressor 8 PTC discharge temperature probe
9. Compressor 9 PTC discharge temperature probe
10. Compressor 10 PTC discharge temperature probe
11. Compressor 11 PTC discharge temperature probe
12. Compressor 12 PTC discharge temperature probe
13. Compressor 13 PTC discharge temperature probe
14. Compressor 14 PTC discharge temperature probe
15. Compressor 15 PTC discharge temperature probe
16. Compressor 16 PTC discharge temperature probe
17. Evaporator common input NTC temperature probe
18. Evaporator 1 outputNTC temperature probe
19. Evaporator 2 output NTC temperature probe
20. Evaporator 3 output NTC temperature probe
21. Evaporator 4 output NTC temperature probe
22. Evaporator common outlet NTC temperature probe
23. Condenser hot water common input NTC temperature probe
24. Circuit 1 condenser hot water input NTC temperature probe
25. Circuit 2 condenser hot water input NTC temperature probe
26. Circuit 3 condenser hot water input NTC temperature probe
27. Circuit 4 condenser hot water input NTC temperature probe
28. Circuit 1 condenser hot water output NTC temperature probe
29. Circuit 2 condenser hot water output NTC temperature probe
30. Circuit 3 condenser hot water output NTC temperature probe
31. Circuit 4 condenser hot water output NTC temperature probe
32. Condenser hot water common output NTC temperature probe
33. System water inlet NTC temperature probe (free-cooling)
34. External air temperature NTC temperature probe (free-cooling)
35. Dynamic/boiler function/change over set-point external air temperature NTC temperature probe
36. Circuit n° 1 combined defrost NTC temperature probe
37. Circuit n° 2 combined defrost NTC temperature probe
38. Circuit n° 3 combined defrost NTC temperature probe
39. Circuit n° 4 combined defrost NTC temperature probe
40. Circuit n° 1 auxiliary outlet NTC temperature probe
41. Circuit n° 2 auxiliary outlet NTC temperature probe
42. Circuit n° 3 auxiliary outlet NTC temperature probe
43. Circuit n° 4 auxiliary outlet NTC temperature probe
44. Domestic hot water temperature control NTC temperature probe
45. Domestic hot water temperature safety NTC temperature probe
46. Discharge NTC temperature probe
47. Solar panel NTC temperature probe
48. Circuit 1 condensing temperature NTC probe
49. Circuit 2 condensing temperature NTC probe
50. Circuit 3 condensing temperature NTC probe
51. Circuit 4 condensing temperature NTC probe
52. Circuit n° 1 condensing pressure probe (4÷20 mA / 0÷ 5 Volt)
53. Circuit n° 2 condensing pressure probe (4÷20 mA / 0÷ 5 Volt)
54. Circuit n° 3 condensing pressure probe (4÷20 mA / 0÷ 5 Volt)
55. Circuit n° 4 condensing pressure probe (4÷20 mA / 0÷ 5 Volt)
56. Circuit n° 1 evaporating pressure probe (4÷20 mA / 0÷ 5 Volt)
57. Circuit n° 2 evaporating pressure probe (4÷20 mA / 0÷ 5 Volt)
58. Circuit n° 3 evaporating pressure probe (4÷20 mA / 0÷ 5 Volt)
59. Circuit n° 4 evaporating pressure probe (4÷20 mA / 0÷ 5 Volt)