PROGRAMMABLE CONTROLLERS
FOR SINGLE OR TWIN-CIRCUIT
CHILLERS - HEAT PUMPS
WITH UP TO 6 COMPRESSORS
APPLICATION MANUAL
CODE 144CHILNUE03
C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Important Notice
This Instruction Manual should be read carefully before installation and before use, and all warnings relating to
installation and electrical connections should be observed; the Manual should then be kept for future reference.
All devices must be disposed of in accordance with local regulations governing the disposal of electrical and
electronic devices.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Table of Contents
1 General Information..................................................................................................................................................6
1.1 Description ......................................................................................................................................................6
2 Applications ..............................................................................................................................................................8
2.1 Air-to-air single-circuit chiller units and air-to-air single-circuit chiller units + heat pump..........................10
2.1.1 Air-to-air single-circuit chiller units ....................................................................................................10
2.1.2 Air-to-air single-circuit chiller units + heat pump................................................................................12
2.2 Air-to-water single-circuit chiller units and air-to-water single-circuit chiller units + heat pump ................14
2.2.1 Air-to-water single-circuit chiller units................................................................................................14
2.2.2 Air-to-water single-circuit chiller units + heat pump...........................................................................16
2.3 Water-to-water single-circuit chiller units and water-to-water single-circuit chiller units + heat pump .......18
2.3.1 Water-to-water single-circuit chiller units ...........................................................................................18
2.3.2 Water-to-water single-circuit chiller units + heat pump....................................................................... 20
2.4 Single-circuit motocondensing air-based units and single-circuit motocondensing air-based units with cycle
inversion.......................................................................................................................................................................22
2.4.1 Single-circuit motocondensing air-based units ....................................................................................22
2.4.2 Single-circuit motocondensing air-based units with cycle inversion ...................................................24
2.5 Single-circuit motocondensing water-based units and single-circuit motocondensing water-based units with
cycle inversion .............................................................................................................................................................26
2.5.1 Single-circuit motocondensing water-based units................................................................................ 26
2.5.2 Single-circuit motocondensing water-based units with cycle inversion...............................................28
2.6 Air-to-air twin-circuit chiller units and air-to-air twin-circuit chiller units + heat pump ..............................30
2.6.1 Air-to-air twin-circuit chiller units.......................................................................................................30
2.6.2 Air-to-air twin-circuit chiller units + heat pump..................................................................................32
2.7 Air-to-water twin-circuit chiller units and air-to-water twin-circuit chiller units + heat pump .....................34
2.7.1 Air-to-water twin-circuit chiller units .................................................................................................. 34
2.7.2 Air-to-water twin-circuit chiller units + heat pump .............................................................................36
2.8 Water-to-water twin-circuit chiller units and water-to-water twin-circuit chiller units + heat pump ............ 38
2.8.1 Water-to-water twin-circuit chiller units..............................................................................................38
2.8.2 Water-to-water twin-circuit chiller units + heat pump.........................................................................40
2.9 Twin-circuit motocondensing air-based units and twin-circuit motocondensing air-based units with cycle
inversion.......................................................................................................................................................................42
2.9.1 Twin-circuit motocondensing air-based units......................................................................................42
2.9.2 Twin-circuit motocondensing air-based units with cycle inversion.....................................................44
2.10 Twin-circuit motocondensing water-based units and twin-circuit motocondensing water-based units with
cycle inversion .............................................................................................................................................................46
2.10.1 Twin-circuit motocondensing water-based units..................................................................................46
2.10.2 Twin-circuit motocondensing water-based units with cycle inversion ................................................48
2.11 Connection Layout of C-PRO MICRO CHIL and C-PRO EXP MICRO .....................................................50
2.11.1 Connection layout of C-PRO NANO CHIL and C-PRO MICRO CHIL.............................................50
2.11.2 Connection layout of C-PRO EXP MICRO.........................................................................................53
3 Component Network and Accessories ....................................................................................................................55
3.1 Example of C-PRO NANO CHIL .................................................................................................................55
3.2 Example of C-PRO MICRO CHIL (built-in version)....................................................................................56
3.3 Example of C-PRO MICRO CHIL (blind version) .......................................................................................57
4 USER INTERFACE................................................................................................................................................58
4.1 Displays and Keyboards ................................................................................................................................58
4.2 List of Pages ..................................................................................................................................................62
5 Parameter List .........................................................................................................................................................68
5.1 List of Configuration Parameters...................................................................................................................69
6 REGULATIONS..................................................................................................................................................... 82
6.1 Machine Status ..............................................................................................................................................82
6.2 Unit Type....................................................................................................................................................... 83
6.2.1 Single-circuit air-to-air units ................................................................................................................83
6.2.2 Single-circuit air-to-water units ...........................................................................................................84
6.2.3 Single-circuit water-to-water units.......................................................................................................85
6.2.4 Single-circuit motocondensing air-based units ....................................................................................86
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6.2.5 Single-circuit motocondensing water-based units................................................................................ 87
6.2.6 Twin-circuit air-to-air units.................................................................................................................. 88
6.2.7 Twin-circuit air-to-water units ............................................................................................................. 90
6.2.8 Twin-circuit water-to-water units......................................................................................................... 92
6.2.9 Twin-circuit motocondensing air-based units......................................................................................94
6.2.10 Twin-circuit motocondensing water-based units..................................................................................96
6.3 Configuration of Circuits...............................................................................................................................98
6.4 Operating Mode Control................................................................................................................................99
6.4.1 Heat-pump-only mode ....................................................................................................................... 100
6.4.2 Geothermal heat pumps......................................................................................................................100
6.5 Compressor Regulation ...............................................................................................................................101
6.5.1 Lateral-band (LB) regulation ............................................................................................................101
6.5.2 Neutral-zone (NZ) regulation.............................................................................................................102
6.5.3 Compressor activation from digital input...........................................................................................103
6.6 Compressor Management ............................................................................................................................104
6.6.1 Compressor statuses...........................................................................................................................104
6.6.2 Rotation of compressors.....................................................................................................................104
6.6.3 Pump-down switch-OFF procedure ...................................................................................................105
6.6.4 Relative-threshold pump-down.......................................................................................................... 105
6.6.5 Protection timings ..............................................................................................................................106
6.6.6 Thermal protection inputs .................................................................................................................. 107
6.7 Condensation Regulation.............................................................................................................................108
6.7.1 Fan linear regulation .......................................................................................................................... 108
6.7.2 Condensing valve regulation.............................................................................................................. 110
6.7.3 Condensing fan pre-start at high external temperatures.....................................................................110
6.7.4 Single condensation ........................................................................................................................... 110
6.8 Fan Management .........................................................................................................................................111
6.8.1 Fan status ...........................................................................................................................................111
6.8.2 Fan timings......................................................................................................................................... 111
6.8.3 Thermal Protection Inputs.................................................................................................................. 111
6.9 Circulating Pump Management ...................................................................................................................112
6.9.1 Pump Status........................................................................................................................................113
6.10 Internal Fan Management............................................................................................................................113
6.10.1 Hot-start function...............................................................................................................................113
6.10.2 Recirculating fan status...................................................................................................................... 114
6.11 Flow Meter Management.............................................................................................................................114
6.12 Defrosting Management ..............................................................................................................................116
6.12.1 Defrosting management via external contact .....................................................................................117
6.12.2 Defrosting cycle compensation.......................................................................................................... 117
6.12.3 Defrosting heating coil.......................................................................................................................118
6.13 Anti-frost management / Chilling-support heating coils..............................................................................118
6.14 Free-Cooling Management..........................................................................................................................119
6.14.1 Free-Cooling Enable .......................................................................................................................... 119
6.14.2 Free-cooling regulation......................................................................................................................119
6.14.3 Free-cooling control valves................................................................................................................121
6.15 Temperature Alarm Control ........................................................................................................................122
6.15.1 Low and high temperature alarm management ..................................................................................122
6.15.2 Management of primary exchanger efficiency alarm.........................................................................122
6.16 Pressure Alarm Control ...............................................................................................................................123
6.16.1 Management of high-pressure pressure-switch alarm........................................................................123
6.16.2 Management of high-pressure transducer alarm ................................................................................123
6.16.3 Management of low-pressure pressure-switch alarm (chiller mode) .................................................123
6.16.4 Management of low-pressure transducer alarm (heat pump mode) ...................................................123
6.16.5 Low start-up pressure alarm...............................................................................................................124
6.17 Miscellaneous Management ........................................................................................................................125
6.17.1 Set point variation..............................................................................................................................125
6.17.2 External probe configuration (AI04 / AI05).......................................................................................125
6.17.3 Evaporation-probe configuration .......................................................................................................126
6.17.4 Dynamic set point ..............................................................................................................................126
6.17.5 Forced shutdown................................................................................................................................127
6.17.6 Power limiting....................................................................................................................................128
6.17.7 High-pressure partialisation at high temperatures (chiller) ................................................................128
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
6.17.8 Low-pressure partialisation at low temperatures (heat pump) ...........................................................129
6.17.9 Operating limit management (heat pump)..........................................................................................131
6.17.10 Function for chilling/heating on demand.......................................................................................131
6.17.11 Manual operation...........................................................................................................................132
6.17.12 Resetting of default parameters..................................................................................................... 133
6.17.13 Programming key .......................................................................................................................... 133
7 DIAGNOSTICS.................................................................................................................................................... 134
7.1 Manual and Automatic Alarms....................................................................................................................134
7.1.1 Manual-reset alarms...........................................................................................................................134
7.1.2 Automatic-reset alarms ......................................................................................................................134
7.2 Alarm Table................................................................................................................................................. 135
7.3 Alarm Relay.................................................................................................................................................136
8 List of Modbus® Variables....................................................................................................................................137
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
1 General Information
1.1 Description
C-PRO NANO CHIL and C-PRO MICRO CHIL are two new families of innovative programmable
controllers, which are both flexible and modular, as well as being capable satisfying all application,
technical and cost requirements of modern single and twin-circuit chillers, with capacity from 4 to
450 KW and up to 6 compressors.
The features of the C-PRO NANO and MICRO CHIL controllers – contained size, I/O availability,
price, etc. – enable, for the very first time, the use of programmable devices even in low-complexity
machines such as chillers - heat pumps with a single circuit, capacity from 4 to 80 KW and up to 3
compressors, where until recently it had only been possible to utilise rigid parameter-based
controllers. By connecting to a C-PRO NANO and MICRO CHIL the C-PRO EXP MICRO I/O
expansion, the advantages in control and price offered by the use of these programmable devices
are also extended to twin-circuit units up to 450 KW and 6 compressors.
The display on these products consists of a 4-digit LED display, with function icons, available in
both product families.
The C-PRO NANO and MICRO CHIL controllers feature:
• 9 inputs, three of which are analogue inputs (2 for NTC temperature probes and 1 for
pressure transducers
0-20 / 4-20 mA or for ratiometric transducers, 0-5 V), 5 are digital and 1 is analogue/digital
(i.e. configurable);
• 9 outputs, of which 3 are analogue (one PWM and two 4-20 mA or 0-10 V) and 6 are digital
(electromechanical relays); analogue outputs enable control of inverters for compressors and for
phase-cut speed regulators for fans.
Using the C-PRO EXP MICRO I/O expansion, I/O is doubled.
Thanks to their design and installation features, these controllers are easily installed – the C-PRO
NANO is panel-mounted, while the C-PRO MICRO is DIN-rail-mounted on an electrical board.
Using the EVKEY programming key, it is possible to upload/download parameters; in addition,
these controllers can be connected to RICS monitoring and supervisory systems.
The application software is created with UNI-PRO and is capable of managing air-to-air, air-towater, water-to-water and motocondensing units.
The following are only some of the numerous control functions available:
• free-cooling management
• pump-down management
• dynamic set point compensation
• double set-point that can be enabled from external contact
• possibility of managing up to 3 scroll compressors for each circuit
• possibility of managing compressors with inverter and fans with phase-cut module
• control of condensing pressure / linear or stepped evaporation
• operation as heat pump only
• activation of compressors from motocondensing machine input
• operation as heat pump with low external temperature
• version with one, two or no circulating pumps.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
C-PRO NANO CHIL
C-PRO MICRO CHIL
Built-in version
C-PRO MICRO CHIL
Blind version
C-PRO MICRO CHIL
Open-frame version
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2 Applications
Management of the following unit types is possible:
1) Air-to-air single-circuit chiller units and air-to-air single-circuit chiller units +
heat pump, using C-PRO NANO CHIL (or C-PRO MICRO CHIL).
Total number of analogue inputs: 4.
Total number of digital inputs: 5 (*).
Total number of analogue outputs: 1 + 2 optional.
Total number of digital outputs: 6.
2) Air-to-water single-circuit chiller units and air-to-water single-circuit chiller
units + heat pump, using C-PRO NANO CHIL (or C-PRO MICRO CHIL).
Total number of analogue inputs: 4.
Total number of digital inputs: 5 (*).
Total number of analogue outputs: 1 + 2 optional.
Total number of digital outputs: 6.
3) Water-to-water single-circuit chiller units and water-to-water single-circuit
chiller units + heat pump, using C-PRO NANO CHIL (or C-PRO MICRO CHIL).
Total number of analogue inputs: 4.
Total number of digital inputs: 5 (*).
Total number of analogue outputs: 1 + 2 optional.
Total number of digital outputs: 6.
4) Single-circuit motocondensing air-based units and single-circuit
motocondensing air-based units with cycle inversion, using C-PRO NANO CHIL (or C-PRO
MICRO CHIL).
Total number of analogue inputs: 4.
Total number of digital inputs: 5 (*).
Total number of analogue outputs: 1 + 2 optional.
Total number of digital outputs: 6.
5) Single-circuit motocondensing water-based units and single-circuit
motocondensing water-based units with cycle inversion, using C-PRO NANO CHIL (or C-PRO
MICRO CHIL).
Total number of analogue inputs: 4.
Total number of digital inputs: 5.
Total number of analogue outputs: 1 + 2 optional.
Total number of digital outputs: 6.
(*) Note: The total number of digital inputs is 6, if analogue input AI04 is used as additional digital
input (parameter PH44).
6) Air-to-air single-circuit chiller units and air-to-air single-circuit chiller units +
heat pump, using C-PRO NANO CHIL (or C-PRO MICRO CHIL) and C-PRO EXP
MICRO.
Total number of analogue inputs: 8.
Total number of digital inputs: 10 (*).
Total number of analogue outputs: 2 + 2 optional.
Total number of digital outputs: 12.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
7) Air-to-water twin-circuit chiller units and air-to-water twin-circuit chiller units
+ heat pump, using C-PRO NANO CHIL (or C-PRO MICRO CHIL) and C-PRO EXP MICRO.
Total number of analogue inputs: 8.
Total number of digital inputs: 10 (*).
Total number of analogue outputs: 2 + 2 optional.
Total number of digital outputs: 12.
8) Water-to-water twin-circuit chiller units and water-to-water twin-circuit chiller
units + heat pump, using C-PRO NANO CHIL (or C-PRO MICRO CHIL) and C-PRO EXP
MICRO.
Total number of analogue inputs: 8.
Total number of digital inputs: 10 (*).
Total number of analogue outputs: 2 + 2 optional.
Total number of digital outputs: 12.
9) Twin-circuit motocondensing air-based units and twin-circuit motocondensing
air-based units with cycle inversion, using C-PRO NANO CHIL (or C-PRO MICRO CHIL) and
C-PRO EXP MICRO.
Total number of analogue inputs: 8.
Total number of digital inputs: 10 (*).
Total number of analogue outputs: 2 + 2 optional.
Total number of digital outputs: 12.
10) Twin-circuit motocondensing water-based units and twin-circuit
motocondensing water-based units with cycle inversion, using C-PRO NANO CHIL (or C-PRO
MICRO CHIL) and C-PRO EXP MICRO.
Total number of analogue inputs: 8.
Total number of digital inputs: 10 (*).
Total number of analogue outputs: 2 + 2 optional.
Total number of digital outputs: 12.
(*) Note: The total number of digital inputs is 12, if analogue inputs AI04 and AI08 are used as
additional digital inputs (parameters PH44, PH45).
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.1 Air-to-air single-circuit chiller units and air-to-air single-
circuit chiller units + heat pump
2.1.1 Air-to-air single-circuit chiller units
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.1.2 Air-to-air single-circuit chiller units + heat pump
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.2 Air-to-water single-circuit chiller units and air-to-water
single-circuit chiller units + heat pump
2.2.1 Air-to-water single-circuit chiller units
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.2.2 Air-to-water single-circuit chiller units + heat pump
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.3 Water-to-water single-circuit chiller units and water-to-
water single-circuit chiller units + heat pump
2.3.1 Water-to-water single-circuit chiller units
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.3.2 Water-to-water single-circuit chiller units + heat pump
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.4 Single-circuit motocondensing air-based units and single-
circuit motocondensing air-based units with cycle inversion
2.4.1 Single-circuit motocondensing air-based units
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.4.2 Single-circuit motocondensing air-based units with cycle inversion
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.5 Single-circuit motocondensing water-based units and single-
circuit motocondensing water-based units with cycle
inversion
2.5.1 Single-circuit motocondensing water-based units
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.5.2 Single-circuit motocondensing water-based units with cycle inversion
Using C-PRO NANO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Using C-PRO MICRO CHIL.
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C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
2.6 Air-to-air twin-circuit chiller units and air-to-air twin-circuit
chiller units + heat pump
2.6.1 Air-to-air twin-circuit chiller units
Using C-PRO NANO CHIL and C-PRO EXP MICRO.
The power supplies of C-PRO NANO CHIL and C-PRO EXP MICRO must be galvanically isolated from each
other.
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