Carel MuChiller UCHBD00001130, Руководство пользователя

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ENG
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.
Fig.5.j
Key
Request Capacity request (temperature control)
C.1 Compressor 1
C.2 Compressor 2
Capacity distribution with BLDC compressors
If the circuit is equipped with a BLDC compressor, this will always be the first to start and the last to stop.
Circuit operation is modulated so as to meet the capacity request, adjusting BLDC compressor speed and
controlling the activation of ON-OFF compressors.
5.4.3 Rotation due to alarm
In the event of a compressor alarm, the next compressor available will be switched on as a replacement if
the temperature control request is sufficiently high as to warrant starting another compressor.
5.4.4 Force rotation (destabilisation)
Some compressor manufacturers specify that on units with multiple compressors, the compressors need
to be rotated after a certain period of inactivity, even if control is stable.
The destabilisation function, which meets this requirement:
l
can be enabled by parameter;
l
avoids refrigerant migration during long periods of inactivity;
l
can also be used to keep all the compressors at operating temperature.
User Code Description Def Min Max UOM
M C020 Maximum circuit destabilisation time 240 5 999 min
M C044
Enable destabilisation
0/1=No/Yes
1 0 1 -
5.5
Compressor
management
μChiller manages scroll compressors with direct starting or modulating BLDC compressors (scroll and
rotary). A maximum of 4 scroll compressors is available in tandem configuration on two circuits; in the HE
configuration (high efficiency with BLDC): maximum 1 BLDC + 1 On-Off in just one circuit. The flow chart
below shows the process for calculating the request to the compressors:
54 | 5. Functions
µC0300053EN rel. 1.0 – 23.07.2018