Carel µC2 User Manual
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Carel µC2 User Manual

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Summary of Contents for Carel µC2

  • Page 1 µC electronic controller User manual...
  • Page 2 CAREL or its branch offices/affiliates have been warned of the possibility of damage.

  • Page 3: Table Of Contents

    Content 1. INTRODUCTION 1.1 General description ..........................7 1.2 User interface ............................7 2. CONNeCTIONS 2.1 General diagram ...........................9 2.2 Network layout .............................9 3. APPlICATIONS .1 Air/air unit ..............................10 .2 AIR/AIR heat pump ..........................11 . AIR/WATER chiller ..........................1 .4 AIR/WATER heat pump ........................14 .5 WATER/WATER chiller .........................16 .6 WATER/WATER heat pump with reversal on gas ................

  • Page 4: Introduction

    (air-air); • antifreeze heater; • alarm signal device. 1.1.3 Programming CAREL offers the possibility to configure all the unit parameters not only from the keypad on the front panel, but also using: • a hardware key; • a serial line.
  • Page 5 1.2.3 funzioni associate ai tasti tasto stato della macchina modalità pressione Loading default values press at power ON Go up a sub-group inside the programming area, until exiting (saving changes to EEPROM) press once In the event of alarms, mute the buzzer (if present) and deactivate the alarm relay press once Access the direct parameters press for 5 s...

  • Page 6: Connections

    µ expansion valve valve Optional board PSOPZKeY*: programming key CONVONOff*: PWM/digital converter CONV0/10A0*: PW/Modbus® RTU CAREL Supervisory PWM/analogic MCh200485*: converter NTC: temperature RS485 serial card MCh2*T*: probes terminal MChRTf**A0: PW/Modbus® RTU SPKT: trasduttori fan speed regulator MCh2*TSV*: CAREL Supervisory di pressione 0...5 V...

  • Page 7: Applications

    3. applICaTIONs 3.1 Air/air unit 3.1.1 Single circuit Key: condernser fan overload condenser probe supply probe electrical heater evaporator supply fan overload supply fan compressor 1 high pressure compressor overload low pressure ambient probe compressor 2 fig. 3.a.a 3.1.2 Two circuits Key: condernser fan overload 1 and 2 condenser probe...

  • Page 8: Air/Air Heat Pump

    3.1.2 Two circuits, 1 condenser fan circuit Key: condernser fan overload condenser probe 1 and 2 supply probe electrical heater 1 and 2 evaporator 1 and 2 supply fan ambient probe compressor 1 high pressure 1 and 2 compressor overload 1 and 2 low pressure 1and 2 compressor 2 compressor ...
  • Page 9 3.2.2 Two circuits Key: condenser fan overload 1 and 2 condernser probe supply probe electrical heater 1 e 2 evaporator 1 and 2 supply fan overload supply fan compressor 1 high pressure 1 e 2 compressor overload 1 and 2 low pressure 1and 2 ambient probe compressor 2...

  • Page 10: Air/Water Chiller

    3.3 AIR/WATER chiller 3.3.1 Single circuit Key: condernser fan overload condenser probe flow switch outlet evaporator probe antifreeze heater inlet evaporator probe compressor 1 high pressure compressor overload low pressure water pump compressor 2 fig. 3.c.a 3.3.2 two circuits, 2 condenser fan circuits and 2 evaporators Key: condenser fan overload 1 and 2 fan 1 and 2...

  • Page 11: Air/Water Heat Pump

    3.3.2 two circuits, 1 condenser fan circuit Key: condenser fan overload condenser probe 1 and 2 flow switch outlet temperature probe evaporator 1 and 2 outlet evaporator probe 1 and 2 antifreeze heater 1 and 2 compressor 1 high pressure 1 and 2 compressor overload 1 and 2 low pressure 1and 2 inlet evaporator probe...
  • Page 12 3.4.2 2 condenser fan circuits Key: condenser fan overload 1 and 2 fan 1 and 2 condenseer probe 1 and 2 flow switch outlet temperature probe evaporator 1 and 2 outlet evaporator probe 1 and 2 antifreeze heater 1 and 2 compressor 1 high pressure 1 and 2 compressor overload 1 and 2...

  • Page 13: Water/Water Chiller

    3.5 WATER/WATER chiller 3.5.1 Single circuit Key: water condensing temperature probe condensator flow switch outlet evaporator probe evaporator antifreeze heater inlet evaporator probe compressor 1 high pressure compressor overload low pressure water pump compressor 2 fig. 3.e.a 3.5.2 Two circuits Key: water condensing temperature probe 1 and 2 condensator 1 and 2...

  • Page 14: Water/Water Heat Pump With Reversal On Gas Circuit

    3.5.3 Ttwo circuits, 2 evaporators Key: water condensing temperature probe 1 and 2 condensator 1 and 2 flow switch outlet temperature probe outlet evaporator probe 1 and 2 antifreeze heater 1 and 2 evaporator water pump compressor 1 high pressure 1 and 2 compressor overload 1 and 2 low pressure 1 and 2 compressor ...
  • Page 15 3.6.2 Two circuits Key: water condensing temperature probe 1 and 2 condensator 1 and 2 flow switch outlet evaporator probe outlet evaporator probe 1 and 2 evaporator 1 and 2 antifreeze heater 1 and 2 water pump compressor 1 high pressure 1 and 2 compressor overload 1 and 2 low pressure 1 and 2 inlet evaporator probe...

  • Page 16: Water/Water Heat Pump With Reversal On Water Circuit

    3.7 WATER/WATER heat pump with reversal on water circuit 3.7.1 Single circuit Key: external internal reversing valve flow switch outlet evaporator probe antifreeze heater evaporator condenser condenser probe compressor 1 high pressure compressor overload low pressure water pump compressor 2 12 13 fig.

  • Page 17: Air-Cooled Condensing Unit Without Reverse Cycle

    3.7.3 Two circuits, 1 evaporator h02= 1 e h21= 4 Key: external internal reversing valve 1 and 2 condenser probe flow switch outlet evaporator probe condenser probe 1 and 2 condenser 1 and 2 outlet evaporator probe 1 and 2 antifreeze heater 1 and 2 evaporator 1 and 2 compressor 1...

  • Page 18: Reverse-Cycle Air-Cooled Condensing Unit

    3.8.2 Two circuits Key: condenser fan overload condenser probe compressor 1 high pressure 1 and 2 compressor overload 1 and 2 low pressure 1 and 2 compressor 2 compressor  compressor 4 fig. 3.h.b 3.9 Reverse-cycle air-cooled condensing unit 3.9.1 Single circuit Key: condenser fan overload condenser probe...

  • Page 19: Water-Cooled Condensing Unit Without Reverse Cycle

    3.9.2 Two circuits with one condenser fan circuit Key: condenser fan overload condenser probe compressor 1 high pressure 1 and 2 compressor overload 1 and 2 low pressure 1 and 2 compressor 2 compressor  compressor 4 reversing valve fig. 3.i.b 3.10 Water-cooled condensing unit without reverse cycle 3.10.1 Single circuit Key:...

  • Page 20: Reverse-Cycle Water-Cooled Condensing Unit

    3.10.2 Two circuits Key: flow switch water cond. temperature probe condenser compressor 1 high pressure compressor overload lw pressure compressor 2 compressor  compressor 4 water pump fig. 3.j.b 3.11 Reverse-cycle water-cooled condensing unit 3.11.1 Single circuit Key: condenser probe condenser antifreeze heater compressor 1...
  • Page 21 3.11.2 Two circuits Key: condenser probe condenser 1 and 2 antifreeze heater 1 and 2 reversing valve compressor 1 high pressure 1 and 2 compressor overload 1 and 2 low pressure 1 and 2 compressor  compressor 2 compressor 4 water pump fig.

  • Page 22: Parameters

    4. paRameTeRs 4.1 General parameters The parameters are divided into 4 different types, according to their level of access by the user (pas- sword) and their function. For each level, only the access to the parameters of the same or lower level can be set. This means that through “factory”...

  • Page 23: Parameter Tables

    4.3 Parameter tables The following tables show of the parameters divided by type/family (e. g. compressor, probes, fans etc.). • Key to the parameter tables level (default) S= super user F= factory D= direct Visibility: The visibility of some groups depends on the type of controller and the value of the parameters. D= defrost (if D01=1) F= fan (if F01=1) N= NTC probe (if /04-/08=2)
  • Page 24 4.3.2 Antifreeze/auxiliary heater setting parameters (A*) display parameter and description default min. max. U.O.M. variat. default visibility supervis. Modbus variabile indicat. level variable type Antifreeze/low ambient temp. (air/air) alarm set point °C/°F 11 (R/W) Analog Differential for antifreeze/low ambient temperature alarm 122.0 °C °F 12 (R/W)
  • Page 25 4.3.5 Defrost setting parameters (d*) display parameter and description default min. max. U.O.M. variat. def. visibility supervis. Modbus variabile indicat. level variable type Defrosting cycle/Condenser antifreeze Flag 7 (R/W) Digital 0= no; 1= sì, con sbrinamento unificato yes, with shared defrosting Time or temp.- press.
  • Page 26 4.3.7 Unit setting parameters (h*) display parameter and description default min. max. U.O.M. variat. def. visibility supervis. Modbus variabile indicat. level variable type Unit model Flag 54 (R/W) Integer 0= air_air unit 1= air_air heat pump 2= air_water chiller = air_water heat pump 4= water_water chiller 5= water_water heat pump with reversal on gas circuit 6= water_water heat pump with reversal on water circuit...
  • Page 27 4.3.8 Alarm setting parameters (P*) display parameter and description default min. max. U.O.M. variat. def. visibility supervis. Modbus variabile indicat. level variable type Flow switch alarm delay when starting the pump 6 (R/W) Integer Flow switch alarm delay during steady operation 64 (R/W) Integer Low pressure alarm delay at start-up...
  • Page 28 Cooling compensation constant -5.0 +5.0 51 (R/W) 51 Analog Maximum distance from the set point 20.0 °C/°F 52 (R/W) 52 Analog Start compensation temperature in cooling mode 176.0 °C/°F 0.0 5 (R/W) 5 Analog Start compensation temperature in heating mode 176.0 °C/°F 54 (R/W) 54...

  • Page 29: Description Of The Parameters

    5. DesCRIpTION Of The paRameTeRs To modify the parameters, see chapter 4 “Parameters.” • Probe settings: parameters (/*) (see Table 4.a) - Type of probe: from /01 to /08: enables the reading of the corresponding analogue input or sets the function •...
  • Page 30 - Antifreeze heater/auxiliary heater differential A05: Differential for the activation and deactivation of the antifreeze heaters (auxiliary heaters in air/air CARel NTC probes (mode h1= 2, 3, 4, 5 e 6) units). Operating diagram of the antifreeze alarm and the antifreeze heaters for air/water and water/water chillers and heat pumps.
  • Page 31 • Probe readings: parameters (b*) - Select probe to be shown on display. b00: Sets the probe reading to be displayed. 0= probe B1 1= probe B2 2= probe B = probe B4 4= probe B5 5= probe B6 6= probe B7 7= probe B8 8= set point without compensation 9= dynamic set point with possible compensation...
  • Page 32 - Delay on power-up (reset power supply) c06: At power ON (when the controller is physically switched ON) the activation of all the outputs is delayed so as to distribute the power input and protect the compressor against repeated starts in the event of frequent power failures.
  • Page 33 - Minimum Off time before the next pump start c17: The diagram below shows an example of the operation of the pump and with burst (active when H05=, see parameter H05). The dashed areas on the compressor line indicate the pump-compressor and compressor-pump delay times.
  • Page 34 - Minimum defrost duration d06: Represents the minimum duration of the defrost cycle (the defrost continues even if the value read by the condenser probe exceeds the end temperature/pressure). If set to 0, the minimum defrost time function is disabled. d06=0: control disabled.
  • Page 35 - Start defrost with 2 circuits d15: This parameter is used to select whether to defrost the two circuits together or separately. d15 = 0 (default): the two circuits start defrosting independently (each according to their own temperatu- re or pressure probe reading), only if H2=1; d15 = 1: the two circuits start defrosting when both have reached the start defrost conditions;...
  • Page 36 F02=: ON when the corresponding compressor is ON, with speed control. When the compressors are stopped the corresponding fans are also stopped, irrespective of the condensing temperature/pressure. With F02= and an NTC condenser probe, when the compressor starts the fans are started at maximum speed for the time F11, irrespective of the temperature measured.
  • Page 37 - Triac impulse duration f12: This represents the duration in milliseconds for the impulse applied to the triac. For induction mo- tors, set the parameter to 2 (default). On the other hand, when using the CONVONOFF0, CONV0/10A0 modules or FCS controllers, set the parameter to 0. Cooling + compressor ON Cooling + compressor ON + NTC cond.
  • Page 38 - fan on time when starting in high condensing temp. f14: establishes the time the fans are operated at maximum speed if starting with a high condensing temperature. F14 = 0: function disabled. F14 > 0: fan on time (in seconds). The function is operational only in chiller mode, if the probe on the condenser is a temperature sensor and only for air-cooled units.
  • Page 39 - µC network configuration h08: Establishes the layout of the tLan network. 0= µC only 1= µC + valve 2= µC + exp. = µC + exp. + valve - enable keypad h09: Used to disable the modification of the DIRECT and USER parameters from the keypad. The value of the parameters can always be displayed.
  • Page 40 PRG button at power ON. - select supervisor protocol h23: establishes the protocol used for the connection to the supervisor from the serial board RS485 H2 = 0: CAREL protocol (baud rate 19200,…) H2 = 1: Modbus protocol • Alarm settings: parameters (P*)
  • Page 41 - Select digital input ID1 P08= 0: none; P08= 1: flow switch with manual reset (normally closed); P08= 2: flow switch with automatic reset (N.C.); P08= : general thermal overload with manual reset (N.C.); P08= 4: general thermal overload with automatic reset (N.C.); P08= 5: thermal overload circuit 1 with manual reset (N.C.);...
  • Page 42 • Control settings: parameters (r*) - Cooling set point r01: between r1 and r14 r02: cooling differential - heating set point (heat pump) r03: between r15 and r16 r04: heating differential - Compressor rotation r05: The rotation of the compressors allows the operating hours to be balanced either statistically, using FIFO logic, or absolutely, by counting the effective operating hours.
  • Page 43 - Dead zone differential r07: (see dead zone) - Activation delay at lower limit of r07 (if r06 = 4) r08: The value set is used in the control algorithm (see timed outlet temperature control) as the maxi- mum time (at the start of the differential) for the activation of the compressors. - Activation delay at upper limit of r07 (if r06 = 4) r09: The value set is used in the control algorithm (see timed outlet temperature control) as the mini- mum time (at the end of the differential) for the activation of the compressors.
  • Page 44 - Minimum Cooling set point r13: Establishes the minimum limit for setting the Cooling set point. - Maximum Cooling set point r14: Establishes the maximum limit for setting the Cooling set point. - Minimum heating set point r15: Establishes the minimum limit for setting the heating set point. - Maximum heating set point r16: Establishes the maximum limit for setting the heating set point.
  • Page 45 - buffer tank suppression (low load) r27: The low load condition is determined when only one compressor is started and then is stopped after operating for less than the time set for parameter r28. The settings are: r27=0: the function is disabled; r27=1: enabled only in chiller mode;...

  • Page 46: Table Of Alarms

    6. Table Of alaRms Key to the table of alarms: *: if the probe is set for the compensation function, in the event of probe faults, the unit continues to operate. ON*: if the expansion card is not present. EVD 1= EVD400 connected to µC (1st circ.) EVD 2= EVD400 connected to the expansion (2nd circ.) alarm...
  • Page 47 hP1: high pressure circuit 1 The alarm is detected irrespective of the status of the pump and the compressors. The compressors corresponding to circuit 1 are immediately stopped (ignoring the set protection times), the buzzer and alarm relay are activated, and the display starts flashing. The fans corresponding to the condenser in circuit 1 are activated at maximum speed for 60 s, so as to oppose the alarm situation, after which they are switched OFF.
  • Page 48 hc1 to hc4: compressor operating hour limit exceeded warning When the number of operating hours for the compressor exceeds the maintenance threshold (as default equal to zero, and consequently the function is disabled), the maintenance request signal is activated. The buzzer and the alarm relay are not activated, however the warning relay is activated (with the expan- sion card fitted).
  • Page 49 l: low load warning The warning does not activate the relay and displays the message “ L ”; reset is automatic. D1: defrost signal circuit 1 When the defrost is on circuit 1, the display shows the message D1. D2: defrost signal circuit 2 When the defrost is on circuit 2, the display shows the message D2.

  • Page 50: Connections,Accessories And Options

    7. CONNeCTIONs,aCCessORIes aND OpTIONs 7.1 Connection diagram The following figure shows the connection diagram for the µC2, in the panel and DIN rail versions. Panel version EV driver EV driver Line Expansion EV Driver board EV Driver tLAN No1 C1/2 C1/2 C3/4 x N02 No3 No4 C3/4 x No5 Tx/Rx GND GND B4 V+...

  • Page 51: Expansion Card

    7.2 Expansion card This device allows the µC to manage the second refrigerant circuit on chillers, heat pumps and conden- sing units with up to 4 hermetic compressors. The following figure shows the connection diagram for the µC expansion card, code MCH200002*. EV Driver Line EV driver...

  • Page 52: Fan Speed Control Board (Code Mchrtf*)

    7.4 Fan speed control board (code MCHRTF*) The phase cutting boards (code MCHRTF****) are used to control the speed of the condenser fans. IMPORTANT: The power supply to the µC (G and G0) and the MCHRTF**** board must be in phase.

  • Page 53: Programming Key (Code Psopzkeya0)

    Warning: the copying of the parameters is allowed only between instruments with the same code. Data loading operation to the key is always allowed. To make identification of the key easier CAREL has inserted a label on which you can describe the loaded programming or the machine to which you are fig.

  • Page 54: Rs485 Serial Options

    7.9 RS485 serial options RS485 serial option for µC panel version (code MCh2004850) The MCH2004850 serial option is used to connect the µC controller to a supervisor network via a standard RS485 serial line. This option uses the input normally associated with the programming key, which has the dual function of key connector/serial communication port.
  • Page 55 Panel installation (code MCh200TP00) This version has been designed for panel installation, with the drilling template measuring 127 x 69 mm with 2 circular holes, diameter 4 mm, as shown in Fig. 7.m. For installation proceed as follows (Fig. 7.n.a): •...
  • Page 56 Connection diagram (remote power supply) Key: 1. alternative: MCH200000*+MCH2004850 (see Fig. 7.o.a); MCH20000 1 * 2. Insert 120 ohm terminal resistor between Tx/Rx+ and Tx/Rx- FCSER00000 for lines longer than 20 m; MCH200TW* MCH200TP* . length max.= 250 m (min. cross-sect. 1,5 mm /AWG16);...
  • Page 57 User interface symbol meaning refrigerant circuit flashing involved Compressor 1 and/or 2 ON Start request Compressor  and/or 4 ON Start request At least one compressor ON 1 e/o 2 Pump/air outlet fan ON Start request 1 e/o 2 Condenser fan ON 1 e/o 2 Defrost active Defrost request...

  • Page 58: Dimensions

    8. DImeNsIONs The following are the mechanical dimensions of each component in the µC controller; all the values are expressed in millimetres. Note: the dimensions include the free connectors inserted. MCh200000* µC panel mounting version MCh200001* µC din-rail mounting version drilling template 71x29 mm com p...
  • Page 59 Condenser fan control modules The four holes for fastening the speed control board have a diameter of 4 mm, and the centre is positio- ned .5 mm from the edges of the board. The boards are supplied with 4 fasteners (H015 mm). code MCHRTF20A0 MCHRTF40A0...

  • Page 60: Codes

    9. CODes Description Code µC single circuit, 2 compressors, panel mounting MCH2000000 µC single circuit, 2 compressors, panel mounting (20 pcs. multiple package) MCH2000001 µC single circuit, 2 compressors, DIN rail version MCH2000010 µC single circuit, 2 compressors, DIN rail version (10 pcs. multiple package) MCH2000011 µC expansion board for 2nd.

  • Page 61: Technical Specifications And Software Updates

    B1, B2, B, B4: NTC CAREL temperature probes (10 kW at 25 °C) fig. 10.a The response time depends on the component used, typical value 90 s B4: NTC temp. probes (10 kW at 25 °C) or CAREL 0 to 5 V ratiometric pressure probes SPKT00**R* Fan output...

  • Page 62: Software Updates

    WARNINGS • If one transform. is used to supply both the µC2 and the accessories, all the G0 terminals on the va- rious controllers or the various boards must be connected to the same terminal on the secondary, and all the G terminals to the other terminal on the secondary, so as to avoid damaging the instrument; •...
  • Page 63 Note __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________________...
  • Page 64 Agenzia / Agency: CAREL S.p.A. Via dell’Industria, 11 - 35020 brugine - Padova (Italy) Tel. (+39) 049.9716611 - fax (+39) 049.9716600 e-mail: carel@carel.com - www.carel.com...

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