Carel MuChiller UCHBP00000090 User Manual
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Carel MuChiller UCHBP00000090 User Manual

Controller for chiller/heat pump
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USER MANUAL
µChiller
Controller for Chiller / Heat Pump
µChiller
+0300053EN - ENG
Up to date version available on
www.carel.com
ENG
LEGGI E CONSERVA
QUESTE ISTRUZIONI
READ AND SAVE
THESE INSTRUCTIONS

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Summary of Contents for Carel MuChiller UCHBP00000090

  • Page 1: User Manual

    µChiller Controller for Chiller / Heat Pump USER MANUAL LEGGI E CONSERVA QUESTE ISTRUZIONI READ AND SAVE THESE INSTRUCTIONS µChiller +0300053EN - ENG Up to date version available on www.carel.com...
  • Page 3 The technical specifications shown in the manual may be changed experience in HVAC/R, on continuous investments in technological without prior warning. The liability of CAREL in relation to its innovations to products, procedures and strict quality processes products is specified in the CAREL general contract conditions, with in-circuit and functional testing on 100% of its products, and available on the website www.carel.com and/or by specific...
  • Page 4 Before delivering the product, Carel has already completed the checks and tests required by the relevant European directives and harmonised standards, using a typical test setup, which however cannot be considered as representing all possible conditions of the final installation.

  • Page 5: Table Of Contents

    Index 5.16 Free cooling functions 5.17 Defrost 5.18 4-way valve management 1. INTRODUCTION 5.19 Manual device management 1.1 Main functions 1.2 Models 6. PARAMETER TABLE 1.3 Accessories 6.1 System 6.2 Compressor 2. INSTALLATION 6.3 BLDC and Inverter 2.1 Warnings 6.4 Valve 2.2 Panel version 6.5 Source 2.3 DIN rail version...

  • Page 7: Introduction

    1. Introduction μChiller is the Carel solution for complete management of air/water and water/water chillers and heat pumps. The maximum configuration manages 2 compressors per circuit (On/Off or BLDC), up to a maximum of 2 circuits (using an expansion card for circuit 2). The distinctive element of μChiller is...

  • Page 8: Models

    Connectivity - NFC or NFC + Bluetooth (BLE) based on the model - allows interaction with mobile devices and simplifies unit commissioning (after having installed the CAREL “Applica” APP for the Android operating system, see chapters "Commissioning" and "User interface"). For assembly, see the technical leaflet +0500146IE.

  • Page 9: Temperature Sensors

    The Enhanced and High Efficiency models have the driver built-into the controller, able to drive unipolar valves (up to Carel model E3V, with a cooling capacity less than 90-100kW); all versions can be connected to the external EVD Evolution driver to drive bipolar valves (with a higher cooling capacity).
  • Page 10 See the technical leaflets +050000488. Fig.1.d Type Application Range SPKT0*13P* 0-5V LP R407C, R290 -1 to 9.3 bars SPKT0*43P* 0-5V LP R410A, R32 0 to 17.3 bars SPKT0*33P* 0-5V HP R407C, R290 0 to 34.5 bars SPKT0*B6P* 0-5V HP R410A, R32 0 to 45 bars SPKT0011C* 4-20mA...
  • Page 11 Fig.1.f 1.3.7 USB/RS485 converter (CVSTDUMOR0) Electronic device used to interface an RS485 network to a personal computer via the USB port. See the technical leaflets +050000590. Fig.1.g 1. Introduction  |  11 µChiller +0300053EN rel. 1.0  – 23.07.2018...

  • Page 12: Installation

    2. Installation Important: avoid installing the controller in environments with the following characteristics: temperature and humidity that do not comply with the ambient operating conditions (see Warnings "Technical specifications"); strong vibrations or knocks; exposure to water sprays or condensate; exposure to aggressive and polluting atmospheres (e.g.: sulphur and ammonia gases, saline mist, smoke) which may cause corrosion and/or oxidation;...

  • Page 13: Din Rail Version

    2.2.3 Removal Fig.2.c Open the electrical panel from the rear and press the anchoring tabs and then the controller to remove 1. Gently press the side anchoring tabs on the controller; 2. Exert slight pressure on the controller until it is removed. Important: the operation does not require the use of a screwdriver or other tools.
  • Page 14 2.4.1 Description of the terminals Panel model G0 G S6 +V S1 S3 5V J5 FBus J4 BMS Fig.2.e DIN rail model G0 G G0 G C NO6 C NO6 S6 +V S1 S3 5V S6 +V S1 S3 5V J5 FBus J4 BMS J5 FBus...

  • Page 15: Probe Connection

    Vbat Emergency power supply from Ultracap module (future use) (not used) Common for relay 6 Digital output (relay) 6 J14(*) Carel ExV unipolar valve connector Tab.2.a (*) for DIN Enhanced / High Efficiency models only NTC probes 4-20 mA probes...

  • Page 16: Positioning Inside The Panel

    Note: O = GND The position of the controller in the electrical cabinet must be chosen so as to guarantee correct physical separation from the power components (solenoids, contactors, actuators, inverters, ...) and the connected Positioning cables. Proximity to such devices/cables may create random malfunctions that are not immediately inside the panel evident.

  • Page 17: Connection To Power+ (For Bldc)

    Fig.2.k For the serial connection between the controller and the Power+ driver, see the specific manual. Also see the following diagram. Connection to Power+ (for BLDC) Fig.2.l Note: in the two-circuit version, the EVD Evolution driver, if used, must be connected to the FieldBus port (terminal J5) on the slave controller.

  • Page 18: Positioning Of Probes/Components

    2.10 Positioning probes/compon ents Fig.2.m: water-cooled unit (left) and air-cooled unit (right) Ref. Description Ref. Description Source User pump User Source pump Evaporator Evaporation pressure probe Filter-drier Discharge temperature probe Liquid receiver Suction temperature probe Compressor High pressure switch Condenser Return temperature sensor (from) source/outside Liquid sightglass User pump flow switch...

  • Page 19: Functional Diagrams

    2.11 2.11.1 Chillers, On/Off compressors and thermostatic expansion Functional valve diagrams Fig.2.n Ref. Description Ref. Description Ref. Description C1/C2 Condenser 1/2 SL1/2 Liquid sightglass 1/2 R1/2 Frost protection heater 1/2 E1/E2 Evaporator 1/2 F1/2 Filter-drier 1/2 Pressure probe/pressure switch V1_C1 Solenoid valve circuit 1 Flow switch Temperature probe/thermostat...
  • Page 20 Ref. Description Ref. Description Ref. Description valve circuit 1 PU1/2 User pump 1/2 AL1_C1/2 Remote alarm circuit 1/2 Thermostatic expansion V2_C2 L1/2 Liquid receiver 1/2 valve circuit 2 Tab.2.c Analogue inputs - Master circuit 1 Configuration Ref. Description Type parameters S1 Return temperature from user S2 Delivery temperature to user S3 Not present...
  • Page 21 Configuration Ref. Description parameters U062; U057; U061 Hc10; C035; U059; U058; ID5 Remote alarm U062; U057; U061 ID6 Not used Digital outputs - Master circuit 1 Configuration Ref. Description parameters C-NO1 Compressor 1 C036 C-NO2 Compressor 2 C036 C-NO3 User pump 1 U063 C-NO4 Frost protection heater (*) U066;...
  • Page 22 2.11.2 Chillers, On/Off compressors with free cooling and thermostatic expansion valve Fig.2.o Ref. Description Ref. Description Ref. Description C1/C2 Condenser 1/2 SL1/2 Liquid sightglass 1/2 Free cooling valve 22  |  2. Installation µChiller +0300053EN rel. 1.0  – 23.07.2018...
  • Page 23 Ref. Description E1/E2 Evaporator 1/2 Ref. Description Ref. Description F1/2 Filter-drier 1/2 Pressure probe/pressure switch V1_C1 Solenoid valve circuit 1 Flow switch Temperature probe/thermostat V1_C2 Solenoid valve circuit 2 CP1/2 Compressor 1/2 Alarm Thermostatic expansion V2_C1 valve circuit 1 PU1/2 User pump 1/2 AL1_C1/2 Remote alarm circuit 1/2...
  • Page 24 Digital inputs - Slave circuit 2 Configuration Ref. Description parameters ID1 Pump 2 overload U061 ID2 Compressor 1 overload C035 ID3 High pressure switch C034 Hc09; C035; U059; U058; ID4 Not present U062; U057; U061 Hc10; C035; U059; U058; ID5 Remote alarm U062;...
  • Page 25 2.11.3 Chillers/heat pumps, On/Off compressors and bipolar ExV expansion valve Fig.2.p Ref. Description Ref. Description Ref. Description C1/C2 Condenser 1/2 SL1/2 Liquid sightglass 1/2 Reversing valve E1/E2 Evaporator 1/2 F1/2 Filter-drier 1/2 Pressure probe/pressure switch 2. Installation  |  25 µChiller +0300053EN rel. 1.0  – 23.07.2018...
  • Page 26 Ref. Description V1_C1 Solenoid valve circuit 1 Ref. Description Ref. Description Flow switch Temperature probe/thermostat V1_C2 Solenoid valve circuit 2 CP1/2 Compressor 1/2 Alarm Thermostatic expansion V2_C1 valve circuit 1 PU1/2 User pump 1/2 AL1_C1/2 Remote alarm circuit 1/2 Thermostatic expansion L1/2 Liquid receiver 1/2 2_Set...
  • Page 27 Digital inputs - Slave circuit 2 Configuration Ref. Description parameters ID1 Pump 2 overload U061 ID2 Compressor 1 overload C035 ID3 High pressure switch C034 Hc09; C035; U059; U058; ID4 Not present U062; U057; U061 Hc10; C035; U059; U058; ID5 Remote alarm U062;...
  • Page 28 2.11.4 Chillers, On/Off compressors and unipolar ExV expansion valve Fig.2.q 28  |  2. Installation µChiller +0300053EN rel. 1.0  – 23.07.2018...
  • Page 29 Ref. Description C1/C2 Condenser 1/2 Ref. Description Ref. Description SL1/2 Liquid sightglass 1/2 R1/2 Frost protection heater E1/E2 Evaporator 1/2 F1/2 Filter-drier 1/2 Pressure probe/pressure switch V1_C1 Solenoid valve circuit 1 Flow switch Temperature probe/thermostat V1_C2 Solenoid valve circuit 2 CP1/2 Compressor 1/2 Alarm...
  • Page 30 Configuration Ref. Description parameters U061 Digital inputs - Slave circuit 2 Configuration Ref. Description parameters ID1 Pump 2 overload U061 ID2 Compressor 1 overload C035 ID3 High pressure switch C034 Hc09; C035; U059; U058; ID4 Not present U062; U057; U061 Hc10;...
  • Page 31 2.11.5 Chillers/heat pumps, BLDC+On/Off compressors and bipolar ExV expansion valve Fig.2.r Ref. Description Ref. Description Ref. Description Condenser Flow switch 4-way reversing valve Evaporator CP1/2 Compressor 1/2 Pressure probe/pressure switch Solenoid valve User pump Temperature probe/thermostat Thermostatic expansion Liquid receiver Alarm valve Oil equalisation valve...
  • Page 32 Analogue inputs Configuration Ref. Description Type parameters S1 Return temperature from user S2 Delivery temperature to user S3 Discharge temperature Hc00 Hc01; Hc02; S4 Condensing pressure 0-5V C040; 041; C042 Hc01; C037; C038; S5 Evaporation pressure 0-5V C039 Hc03; U025; S6 Not present U026;...
  • Page 33 2.11.6 Chillers/heat pumps, BLDC+On/Off compressors and bipolar ExV expansion valve Fig.2.s Ref. Description Ref. Description Ref. Description Condenser Flow switch 4-way reversing valve Evaporator CP1/2 Compressor 1/2 Pressure probe/pressure switch Solenoid valve User pump Temperature probe/thermostat Thermostatic expansion Liquid receiver Alarm valve Oil equalisation valve...
  • Page 34 Analogue inputs Configuration Ref. Description Type parameters S1 Return temperature from user S2 Delivery temperature to user S3 Discharge temperature Hc00 Hc01; Hc02; S4 Condensing pressure 0-5V C040; 041; C042 Hc01; C037; C038; S5 Evaporation pressure 0-5V C039 Hc03; U025; S6 Not present U026;...

  • Page 35: Commissioning

    Configuration procedure Once the Carel “Applica” app has been installed and opened (see the paragraph “Mobile device”, proceed as follows: 7. For NFC devices (A), move the mobile device near to the μChiller user terminal (the position of the NFC antenna on the mobile device must be identified in order to place it over the display): wait for the signal that the device has been read (B).
  • Page 36 S065 Type of source fan (0/1=Modulating/ON-OFF) S064 Type of source air circuit (0=Independent; 1=Common) E047 ExV driver (0=Disabled; 1=Built-in; 2=EVD Evolution) EVD Evolution: valve (1=CAREL ExV, ...) (*) E046 (*) see EVD Evolution manual for the complete list of selectable valves E020 MOP in cooling: threshold 30.0 -60.0 200.0...
  • Page 37 Par. Description Def. Min. Max. UOM ID5 configuration (0=Not used; 1=Comp. 2 circuit 1 overload; 2=Remote ON/OFF; Hc07 3=Cooling/Heating; 4=2nd Set point; 5=Remote alarm; 6=User pump 1 overload) S6 configuration S6 (0=Not used; 1=Remote set point; 2=Source temperature; Hc03 3=Reserved) ID4 configuration (Slave) (0=Not used;...

  • Page 38: Applica Desktop

    1: accesses the configurations saved by the user; 2: accesses the saved clones; 3: accesses the configurations prepared by Carel. Commissioning software (Applica Desktop) Applica Desktop is a program intended for manufacturers and installers of units fitted with the μChiller controller.
  • Page 39 3. For μChiller Standard and Enhanced models (with On/Off compressor), select the "Refrigerants" section and then the refrigerant charged on the unit. 4. (NOTE: the BLDC compressor configuration must be performed with the unit OFF and the "Crankcase heater" function disabled (par. P034 = 0). For High Efficiency models (HE, with BLDC compressor), first import the BLDC compressor configuration, selecting the "BLDC Compressors"...
  • Page 40 Fig.3.n 10. Applica Desktop will display a message when the parameters have been set, and if necessary indicating any values that have been applied that do not belong to the current user profile (some parameters may not be visible to the user). 11.

  • Page 41: User Interface

    Device status and operating mode icons Fig.4.a Note: the user terminal only allows access to certain parameters at the User and Service levels: to access all of the Service and Manufacturer parameters, use the Carel Applica app or the configuration and commissioning tool. 4.2.1 Keypad...

  • Page 42: Standard Display

    Icon Function Flashing System pump Active In manual operation Source device status Active In manual operation (pump/fan) Compressor status Active In manual operation (with ExV) Frost protection heater Active Heating Cooling High water temperature Operating mode Defrost Dripping after defrosting Free cooling Service request on exceeding Serious alarm, action required by...
  • Page 43 - "ESC" to exit the dashboard. Example Go to the standard Press DOWN: EuP1 Press DOWN: Cnd1 Press DOWN: CMP indicates display. indicates the evaporation indicates the condensing that compressor 1 is on (o) temperature in circuit 1 temperature in circuit 1 and compressor 2 is off (_).
  • Page 44 9. Press DOWN: the 10. Press DOWN: the unit 11. After having function to delete the of measure selection completed the settings, alarm log (ClrH) is shown (UoM) is shown to exit either: a) from the - Service level only. categories press ESC and then PRG;...
  • Page 45 Category Hst (Alarm log): access the alarm log. Each Category (Clock): event is described with the identified by code Haxx, Use Log- Out to exit the Use ESC to return to the date (in the format DD these are the parameter category.

  • Page 46: Functions

    5. Functions μChiller can control either the unit’s return or delivery water temperature. Regardless of how the cycle is reversed (water or refrigerant circuit), probes S1 and S2 are always the return (from user) and delivery (to Temperature user) water temperature probes. See the Installation chapter. control 5.1.1 PID control Two types of PID control are available:...
  • Page 47 4. once the compressor has started, after a set time, control switches from PID at start- up to PID in operation; 5. when the controller requests deactivation of the compressors, these are enabled to stop; 6. after the last compressor has been stopped, restart is managed using the PID at start-up. If the delay between PID at start-up/in operation is set to 0, PID control in operation will always be active.
  • Page 48 Compensation in cooling: Fig.5.a Ext. Temp. Outside temperature Std set Control set point Outside temperature to start compensation in cooling mode Outside temperature to end compensation in cooling mode Maximum compensation value in cooling mode Compensation in heating: Fig.5.b Ext. Temp. Outside temperature Std set Control set point...

  • Page 49: User Pumps

    Fig.5.c Set point Current set point Offset Delay at start-up Delay in steady operation Alarm μChiller can manage up to two user-side pumps (depending on the hardware used and the required configuration). User pumps A delay can be set between pump and compressor activation (= temperature control enabled). A delay can also be set between the deactivation of the last compressor and the pump.

  • Page 50: Frost Protection Control

    Unit ON NOT OK Thermoregulation Pump ON enable delay Flow alarm delay from pump start NOT OK Flow status check, pump status NOT OK Flow alarm Possible compressor start up Fig.5.e Temperature control is enabled only after the flow alarm delay from pump on, so as to prevent the compressors from starting if there is no fluid flow.
  • Page 51 The figure shows the action of the filter on the evaporation temperature, according to the exponential distribution formula. Fig.5.f Filtered evaporation temperature Filter with low delay Filter with high delay When the filtered evaporation temperature falls below the alarm threshold, a counter is activated, and the counter time- out is either increased or decreased based on the deviation of the evaporation temperature from the frost protection threshold, until reaching zero when the deviation from the threshold it is greater than the differential, following a hyperbolic trend.
  • Page 52 Fig.5.h t [s] Time [s] Thrsh Frost protection alarm threshold Frost protection alarm The value of the delay (at 1K) in the previous example refers to a plate evaporator; if a tube bundle evaporator is used, which has greater thermal inertia, the delay time (at 1K) can be increased to a suitable value.

  • Page 53: Compressor Rotation

    Tin (Pevap) Evaporator refrigerant inlet temperature Tout (Pevap) Saturated evaporation temperature “dew” Pcond Condensing pressure Pevap Evaporation pressure Note: as a consequence of the above, the suggested frost protection set point with pure water and R407C refrigerant is 4-4.5°C. 5.3.3 Frost prevention The frost protection threshold on the evaporation temperature is used as the minimum evaporation temperature threshold for frost prevention.

  • Page 54: Compressor Management

    To avoid simultaneous starts or stops of several compressors, there are two fixed minimum delays: one between starts (30 s) and the other (10 s) between stops. Compressor capacity distribution in steps Below is an example of capacity distribution with two circuits in the tandem configuration with two fixed-speed compressors (scroll), each with the same capacity, and FIFO rotation.
  • Page 55 5.5.1 Predefined BLDC compressors The type of BLDC compressor can be chosen from the list of compressors available on KSA (ksa.carel.com), μChiller section. When selecting a specific type of compressor, the following parameters are set based on the compressor manufacturer’s technical specifications:...

  • Page 56: Bldc Compressor Protectors

    5.5.3 BLDC compressor start-up μChiller manages the start-up of BLDC compressors in accordance with the manufacturer’s specifications: on starting, the compressor is brought to start- up speed and kept at that speed, irrespective of the control request, for the entire minimum on time. At the end of this period, the speed is modulated by the controller, based on: request;...
  • Page 57 equivalent temperature (par. C017), frost protection alarm thresholds (par. U050 and S057) and MOP threshold (to control the maximum evaporation temperature, par. E020 and E022). User Code Description P000 Min evaporation temp.: custom limit -25.0 -99.9 999.9 °C/°F P001 Max condensing temp.: custom limit 70.0 -99.9 999.9...

  • Page 58: Bldc Comp. Alarm Prevention

    the nominal compressor threshold; the threshold modifiable by Service (par. P000); the frost protection limit, depending on the mode (par. U050 in cooling and par. S057 in heating with water/water units). In addition to the operating limits defined by the shape of the envelope, there is also (heat pump versions only) a "Maximum discharge temperature"...
  • Page 59 Below are details of the various actions to prevent the operating limits from being exceeded; action 1 refers to the control action (before exiting the envelope); action 2 to the limiting action (working point already outside of the envelope). Low evaporation pressure prevention (zone 2) The low evaporation pressure limit for the prevention action is determined by maximum between: the nominal compressor threshold (BLDC only);...
  • Page 60 High condensing pressure prevention (zone 5) Device Description 1. Decrease the rate of capacity increase. BLDC compressor 2. Limit capacity 1. - Tandem on-off compressors 2. Shutdown a compressor ExV valve High motor current prevention (zone 6) Device Description 1. Decrease the rate of capacity increase. BLDC compressor 2.

  • Page 61: Compressor Alarms

    The solution driver provided manages unipolar valves up to a certain cooling capacity (Carel E3V - cooling capacity up to 90- 100 kW) with the built-in driver (DIN model only) and bipolar valves with higher capacities, using the external EVD Evolution driver.

  • Page 62: Control Of The Expansion Valve

    On the μChiller panel version, analogue output Y1 is the only output available: consequently to control an on-off fan, a CONVONOFF module (Carel) is needed to convert the 0-10 V analogue output into a relay control. On the versions for DIN rail mounting, relay NO6 is available and can be configured as a fan output.
  • Page 63 User Code Description NO6 configuration Hc12 0=Frost protection 1=Source fan/pump Type of source fan S065 0/1=Modulating/ON-OFF S028 Source fan in cooling: set point 30.0 -999.9 999.9 °C S029 Source fan in heating: set point 10.0 99.9 °C S031 Source fan in cooling: set point at start-up 45.0 999.9 °C...
  • Page 64 Fig.5.p Max speed Modulating source fan: max speed value Min speed Modulating source fan: min speed value Control set point Control differential Tc max Maximum condensing temperature Condensing temperature In the graph, some offsets are expressed with a numerical value, indicating that they are not modifiable but rather are fixed parameters.
  • Page 65 User Code Description C017 Max high pressure threshold (HP) 65.0 999.9 °C S029 Source fan in heating: set point 10.0 99.9 °C S035 Source fan: differential in heating 99.9 S036 Modulating source fan: min speed value 20.0 100.0 S037 Modulating source fan: max speed value 80.0 100.0 The control diagram is shown below:...

  • Page 66: Free Cooling

    5.14 The free cooling (FC) function can be enabled only on chiller units. The type of free cooling is configured by parameter, and may be: Free cooling air free cooling, on air/water units equipped with air- water heat exchanger coils upstream of the condenser coils and with modulating fan control;...
  • Page 67 Outputs used: 0-10 V to manage the common fan between free cooling and condenser; Free cooling valve On-Off control. Fig.5.t Ref. Description Ref. Description FC_E Free cooling heat exchanger FC_V Free cooling valve Condenser User pump Evaporator User return probe Filter-drier User delivery probe Liquid receiver...
  • Page 68 Fig.5.u Ref. Description Ref. Description FC_E Free cooling heat exchanger FC_V Free cooling valve Condenser User pump Evaporator User return probe Filter-drier User delivery probe Liquid receiver Outside temperature probe Compressor Thermostatic expansion valve Liquid sightglass Solenoid valve Tab.5.e 5.15.3 Water-cooled condensing unit Free cooling is enabled based on the comparison between the user return water temperature and the source water temperature (Temp.

  • Page 69: Free Cooling Functions

    Fig.5.v Ref. Description Ref. Description FC_E Free cooling heat exchanger Solenoid valve Condenser FC_V Free cooling valve Evaporator User pump Filter-drier Source pump Liquid receiver User return probe Compressor User delivery probe FC_E Free cooling heat exchanger Source return probe Liquid sightglass Thermostatic expansion valve Tab.5.f...

  • Page 70: Defrost

    Design free cooling delta T Temp. User return temp. - source temp. The diagram shows the ideal behaviour of free cooling control (FC) in relation proportionally to its capacity; "Design free cooling delta T" is the temperature difference (water inlet - source) needed to cover the rated unit capacity using the free cooling coil only.
  • Page 71 User Code Description S046 Defrost: min duration S047 Defrost: max duration Example of defrost activation: Fig.5.y Temperature End Thrs End defrost temperature Res Thrs Reset start defrost delay threshold Set Thrs Start defrost temperature Defrost start delay Start Start defrost End defrost T_Cond Condensing temperature...
  • Page 72 Fig.5.z Defrost Defrost request Cycle reversal (4-way valve) Compressor capacity Enable fans Electronic expansion valve The control phases are described below. Synchronisation (1) Once the defrost start condition is true, there is a fixed delay of 10 s to check whether the other circuit requires defrosting, so as to carry out a simultaneous defrost if needed.
  • Page 73 valve tends to close, due to low superheat. As a result it is forced to the maximum opening so as to guarantee a constant flow of refrigerant and maximum defrost capacity. Defrosting (5) The actual defrosting procedure starts: the compressor delivers full capacity so as to defrost the outdoor coil.
  • Page 74 User Code Description Dripping: duration S048 0=Dripping not performed Post-dripping phase (case with comp. OFF) (10) During this phase, the fans are started at 100% speed to completely expel any water still on the coil. The duration of the post- dripping phase can be set. At the end of the post- dripping phase, the circuit is reactivated in normal heat pump operation.
  • Page 75 Fig.5.aa Delay Calculated defrost start delay Defrost start delay D1 x 5 Maximum defrost delay (5 x D1) Temp Outside air temperature 5.17.3 Defrost synchronisation On two-circuit units, the defrosting procedures can be synchronised. User Code Description Defrost synchronisation 0=Independent S053 1=Separate 2=Simultaneous...

  • Page 76: Way Valve Management

    5.18 A special function has been included to ensure correct control of the 4- way valve that reverses the refrigerating cycle. When there is a request to reverse the valve, the controller checks whether the 4-way valve pressure difference is higher than a threshold before activating the valve: if the difference is lower, the management application waits until the compressor starts and then activates the valve when the pressure difference is reached.

  • Page 77: Parameter Table

    6. Parameter table Note: Levels: U=User; S=Service; M=Manufacturer; Display: the x indicates that the parameter can be accessed from the display terminal. 6.1 System User Display Code Description Def. Min. Max. UOM Modbus Plt = System U000 User pump 1: maintenance hour threshold (x100) HR002 U001 User pump 1: reset hour counter...
  • Page 78 User Display Code Description Def. Min. Max. UOM Modbus Operating mode changeover U034 0=Keypad CS005 1=Digital input U035 Cooling/heating changeover: delay HR053 Control probe at start-up U036 0=Return CS006 1=Delivery U037 PID control delay at start-up/operation HR054 Control probe in operation U038 0=Return CS007...

  • Page 79: Compressor

    User Display Code Description Def. Min. Max. UOM Modbus 0/1=no/yes U069 Free cooling: activation differential 99.9 HR08 (2R) U070 Free cooling: hysteresis 99.9 HR08 (2R) U071 Design free cooling delta T 99.9 HR08 (2R) U072 Water free cooling: valve closing threshold -999.9 999.9°C °C...
  • Page 80 User Display Code Description Def. Modbus C014 Min time between consecutive compressor starts HR163 C017 Max high pressure threshold (HP) 65.0 999.9 °C HR324 (2R) C018 Min low pressure threshold (LP) -99.9 99.9 HR326 (2R) C020 Maximum circuit destabilisation time HR168 C022 Circuit 1: discharge temp.

  • Page 81: Bldc And Inverter

    6.3 BLDC and Inverter User Display Code Description Def. Modbus P000 Min evaporation temp: custom limit -25.0 -99.9 999.9 °C/°F HR335 (2R) P001 Max condensing temp: custom limit 70.0 -99.9 999.9 °C/°F HR337 (2R) P003 Out of envelope alarm delay HR340 P004 Low pressure differential alarm delay...

  • Page 82: Source

    E034 Control delay after pre-positioning 18000 HR146 E046 EVD Evolution: valve (1=CAREL EXV, ...) (*) HR048 E047 ExV driver (0=Disabled, 1=Built-in, 2=EVD Evolution) HR328 Tab.6.d Note: (*) see the EVD Evolution manual for the complete list of selectable valves.
  • Page 83 User Display Code Description Def. Modbus 1=0% 2=1%, .. 101=100% Source fan 1 circuit 2: maintenance hour threshold S012 HR217 (X100) S013 Source fan 1 circuit 2: reset hour counter CS034 Source ON/OFF fan 1 circuit 2: operating mode 0=AUTO S014 HR218 1=OFF...

  • Page 84: I/O Settings

    User Display Code Description Def. Modbus 1=Separate 2=Simultaneous S054 4-way valve: pressure differential for reversing 999.9 HR274 (2R) Compressor after defrost S055 CS038 0/1=On/Off S056 BLDC smart start: duration (*) HR278 S057 Source frost protection: alarm threshold -0.8 -999.9 999.9 HR279 (2R) S058 Source frost protection: alarm differential...
  • Page 85 User Display Code Description Def. Max UOM Modbus 1=Remote set point ID4 configuration 0=Not used 1=Comp 2 circuit 1 overload 2=Remote ON/OFF Hc06 HR291 3=Cooling/Heating 4=2nd set point 5=Remote alarm 6=User pump 1 overload ID5 configuration 0=Not used 1=Comp. 2 circuit 1 overload 2=Remote ON/OFF Hc07 HR292...

  • Page 86: Bms Port

    6.7 BMS port User Display Code Description Def. Modbus Hd00 BMS: serial address BMS: baud rate 3=9600; 4=19200; Hd01 5=38400; 6=57600; 7=115200; 8=375000 BMS: settings 0=8-NONE-1 1=8-NONE-2 Hd02 2=8-EVEN-1 3=8-EVEN-2 4=8-ODD-1 5=8-ODD-2 Tab.6.g 6.8 Password User Display Code Description Def. Modbus He00 User password...
  • Page 87 User Display Code Description Def. Modbus ScP1 Circuit 1: suction pressure -999.9 999.9 IR022 (2R) ScP2 Circuit 2: suction pressure -999.9 999.9 IR030 (2R) Sct1 Circuit 1: suction temperature -999.9 999.9 °C IR014 (2R) Sct2 Circuit 2: suction temperature -999.9 999.9 °C IR018 (2R)

  • Page 88: Settings

    6.10 Settings User Display Code Description Def. Modbus SEtC Cooling set point U006 U007 °C/°F HR307 (2R) SEtH Heating set point 40.0 U008 U009 °C/°F HR309 (2R) Unit On-Off from keypad 0=OFF CS54 1=ON Cooling/heating from keypad ModE 0=Cooling CS55 1=Heating Reset alarms from BMS CS56...

  • Page 89: Supervisor Table

    6. Supervisor table μChiller provides a database of supervisor variables via Modbus RTU protocol over RS485 (BMS port on the μChiller controller). The BMS port has the following default settings: baud rate 115,200; data bits 8; no parity; stop bits 1. See "Parameter table: BMS port"...

  • Page 90: Input Status

    Index Size Ref. Type Min/Max R/W UoM Description S062 BOOL S062 - Source pump output logic (0=N.O., 1=N.C.) S063 BOOL S063 - Reverse valve output logic (0=N.O., 1=N.C.) S064 BOOL S064 - Source flow type (0=Independent, 1=Common) S065 BOOL S065 - Source fan type (0=Inverter, 1=ON/OFF) S068 BOOL S068 - Unit type (0=Air/Water, 1=Water/Water)
  • Page 91 Index Size Ref. Type Min/Max R/W UoM Description BOOL Circuit 1 - Overload compressor 2 BOOL Circuit 1 - Compressor 1 maintenance BOOL Circuit 1 - Compressor 2 maintenance BOOL Circuit 1 - Source fan 1maintenance BOOL Circuit 1 EVD - Low superheating (SH) BOOL Circuit 1 EVD - Low evaporation pressure (LOP) BOOL...

  • Page 92: Holding Register

    Index Size Ref. Type Min/Max R/W UoM Description BOOL Comp1Circ2_On - Compr.1 circ.1 status (0=OFF, 1=ON) BOOL Comp2Circ2_On - Compr.2 circ.2 status (0=OFF, 1=ON) BOOL RelayAlrm - Global alarm relay BOOL CoolHeat - Unit in heating mode (0=Cooling, 1=Heating) BOOL FC_Status - Free cooling valve status (0=OFF, 1=ON) BOOL Antifreeze heater status...
  • Page 93 Type Min/Max R/W UoM Description U028 REAL -99.9..99.9 R/W U028 - Remote setpoint offset E046 1..24 E046 - ExV valve type for EVD EVO (1=CAREL EXV, ...) U031 REAL 0..99.9 U031 - High water temp. setpoint offset U032 0..99 U032 - High water temp. startup delay U033 0..999...
  • Page 94 Index Size Ref. Type Min/Max R/W UoM Description E021 REAL 0..800 E021 - ExV MOP regulation Ti in cool E022 REAL -60..200 °C/°F E022 - ExV MOP regulation threshold in heat E023 REAL 0..800 E023 - ExV MOP regulation Ti in heat E024 0..18000 E024 - ExV low SH alarm delay time...
  • Page 95 Index Size Ref. Type Min/Max R/W UoM Description S025 REAL 0..999.9 °C/°F S025 - Low noise source fan setpoint in cooling S026 0..999 S026 - Compr. delay ON since the source pump ON S027 0..999 S027 - Source pump delay OFF since the compr. OFF S028 REAL -99.9..999.9 R/W °C/°F S028 - Source fan cool setpoint...

  • Page 96: Input Register

    Index Size Ref. Type Min/Max R/W UoM Description P007 REAL 0..999.9 P007 - Oil recovery min compr. speed for activation P008 UINT 0..999 P008 - Oil recovery time before activation in which the compr. can run at min speed P009 UINT 0..999 P009 - Oil recovery duration in which the compr.
  • Page 97 Index Size Ref. Type Min/Max R/W UoM Description SEtA REAL °C/°F SEtA - Actual setpoint used by thermoregulation SSH1 REAL SSH1 - Suction Superheat of circ.1 Opn1 Opn1 - EEV position of circ.1 SSH2 REAL SSH2 - Suction Superheat of circ.2 Opn2 Opn2 - EEV position of circ.2 rUSr...

  • Page 98: Alarms And Signals

    7. Alarms and signals 7.1 Types of The controller manages three types of alarms, depending on the reset mode: A - automatic: the alarm is reset and the device restarts automatically when the alarm condition is no alarms longer present; R - semi-automatic: if the alarm occurs several times, reset becomes manual and an operator needs to physically restart the device.

  • Page 99: Alarm List

    7.2 Alarm list No. of Evaluation Code Description Reset Effect Buzzer LED Priority Delay attempts period (s) Unit: no. of permanent memory Fault writes A02 Unit: permanent memory writes Fault A03 Unit: remote alarm from digital input Unit shutdown Serious, unit A04 Unit: remote set point probe Use standard set point Fault...
  • Page 100 No. of Evaluation Code Description Reset Effect Buzzer LED Priority Delay attempts period (s) Serious, circuit A37 EVD circuit 1: MOP Circuit 1 shutdown Par. E026 Serious, circuit A38 EVD circuit 1: motor error Circuit 1 shutdown A39 EVD circuit 1: emergency closing Fault, circuit 1 EVD circuit 1: incomplete valve Fault, circuit 1...
  • Page 101 No. of Evaluation Code Description Reset Effect Buzzer LED Priority Delay attempts period (s) Serious, circuit A71 EVD circuit 2: motor error Circuit 2 shutdown Serious, circuit A72 EVD circuit 2: emergency closing Circuit 2 shutdown - / X 3600 EVD circuit 2: incomplete valve Serious, circuit Circuit 2 shutdown...

  • Page 102: Technical Specifications

    8. Technical specifications Model UCHBP* (panel models) UCHBD* (DIN rail models) Physical specifications Dimensions See figures Case Polycarbonate Mounting panel DIN rail Ball pressure test temperature 125°C Ingress protection IP20 (rear) - IP65 (front) IP00 Use soft, non-abrasive cloth and Front cleaning neutral detergent or water Environmental conditions...

  • Page 103: Connector/Cable Table

    UCHBP* (panel models) UCHBD* (DIN rail models) Valve output Available only on DIN version CAREL E*V unipolar valve power supply: 13 Vdc, min winding resistance 40 Ω Analogue outputs (Lmax=10m) Y1, Y2 0-10 Vdc: 10 mA max Digital outputs (Lmax=10m) NOTE: the sum of current draw on NO1, NO2, NO3 and NO4 must not exceed 8 A NO1(5A), NO2(5A), NO3(5A), NO4(5A);...
  • Page 104 4-pin Microfit crimp connector 0.05-0.52 J10 Ultracap 3-pin JST connector 0.13 J11 Output NO6 3-pin Microfit crimp connector 0.5-1.31 J14 Unipolar ExV valve CAREL ExV unipolar valve connector, pre-wired 2, 6 with shielded cable Tab.8.a 104  |  8. Technical specifications µChiller +0300053EN rel. 1.0  – 23.07.2018...

  • Page 105: Release Notes

    9. Release notes Software version Manual version Description 1.9.0 First release 08/03/2018 16/03/2018 Tab.9.a 9. Release notes  |  105 µChiller +0300053EN rel. 1.0  – 23.07.2018...
  • Page 106 106  |   µChiller +0300053EN rel. 1.0  – 23.07.2018...
  • Page 107   |  107 µChiller +0300053EN rel. 1.0  – 23.07.2018...
  • Page 108 Delete this text and replace it with your own content. CAREL INDUSTRIES S.p.A. - Headquarters Via dell'Industria, 11 35020 Brugine - Padova (Italy) CAREL can accept no responsibility for possible errors in this manual. CAREL reserves the right to modify its products without notice. Tel. (+39) 049.9716611 Fax (+39) 049.9716600...

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