Carel uChiller UCHBD00001230, User Manual

Page: 7 / 108

7
ENG
μc0300053EN rel. 2.2 - 14.12.2021
Introduction
μChiller is the Carel solution for complete management of air/water and water/water chillers and heat pumps, and condensing
units. The solution also allows the fi eld replacement of μchiller2 and μchiller2 SE with the new product (hereinafter called the
Legacy model). The maximum confi guration manages 2 compressors per circuit (*), up to a maximum of 2 circuits (using an
expansion card for circuit 2). The distinctive element of μChiller is complete control of high- effi
ciency units through integrated
management of electronic expansion valves (ExV) and brushless BLDC compressors, thus ensuring greater compressor protec-
tion and reliability and a high-effi
ciency unit. The user terminal allows wireless connectivity with mobile devices and is built- in
on the panel mounted models, or sold separately on DIN rail mounted models. CAREL’s “APPLICA” app, available on Google Play
for the Android operating system, makes it easier to confi gure parameters and commission the unit in the fi eld.
(*): 2 On/Off compressors or 1 BLDC comp 1 On/Off compressor.
1.1 Main functions
Ref. Description
Main features Up to two circuits and 2 + 2 compressors
Compressors in tandem confi guration with possible BLDC compressor (*)
Air/water chiller or heat pump (A/W)
Water/water chiller or heat pump (W/W)
Cooling-only condensing unit
Reverse-cycle condensing unit
Air/air unit, cooling only (Legacy models only)
Air/air unit, reverse-cycle (Legacy models only)
1 evaporator per unit
Air-cooled condenser with separate/shared air circuit for A/W units
Water-cooled condenser with single circuit for W/W units
Hardware Panel mounted model: management of ON-OFF compressors
DIN rail mounted model: management of ON-OFF compressors
DIN rail mounted model, enhanced: management of ON-OFF compressors
DIN rail mounted model, high effi
ciency: management of BLDC compressors
User interface 7-segment, 2-row LED display, optional pGDx graphic display, communication via APPLICA
app (compatible with NFC and BTLE) for mobile devices
Temperature control PID at start-up
PID in operation
Set point compensation on outdoor temperature
C
ompressor rotation FIFO or timed
C
ompressor management Specifi c BLDC compressors (see list on KSA - μChiller section)
Generic scroll compressors
O
il management with
B
LD
C
Oil recovery function (extended operation at part load)
Oil equalisation (tandem with BLDC compressor)
C
ircuit destabilisation Forced compressor rotation (extended operation at part load)
ExV driver Built-in valve driver on enhanced and high effi ciency models
External driver management via FieldBus port (all versions)
Programming with time bands Unit ON-OFF or 2nd set point (1 time band per day)
"Noise reduction" function for condenser fans (1 time band per day)
User pumps 1/2 pumps (2 pumps only with 2 circuits)
Rotation by time or with pump overload alarm
Cyclical activation during standby
Water-cooled condenser 1 common pump for both circuits
Air-cooled condenser Independent fans on each circuit or common to both circuits
Fan modulation based on condensing temperature (On/Off fan control via CAREL CONVONOFF0 module)
Optimised start-up to quickly bring the compressor(s) to steady operation
Fan anti-block protection (harsh climate)
Defrost Simultaneous
Separate
Independent
Using only the fans
Defrost interval managed based on outside temperature ("sliding defrost")
Prevent Prevention of scroll compressor operating limits in relation to condensing and evaporation temperature
Evaporator frost prevention
Total management of the BLDC compressor envelope limits
Alarms Management of automatic and manual reset according to alarm severity (see the chapter on Alarms)
Alarm log (up to 20 events): alarm and reset date and time recorded
C
onnectivity/supervision RS485 serial port
Modbus RTU
Baud rate up to 115200 bit/s
Frame confi gurable by Parity (None, Even, Odd) and StopBits (1 or 2); Databits fi xed at 8 bits.
Tab. 1.a
(*) the confi guration envisaged requires the capacity of the ON/OFF compressor to be equal to 60% of the capacity of the BLDC compressor (at maxi-
mum speed).
1. INTRODUCTION