v. 3.0
Reference guide
Compressor Control Module CM-RC-01
3.0
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4.1.2
Oil heater
The oil heater ensures lubricity of the oil even after long standstill periods. It prevents increased
refrigerant dilution in the oil and therefore a reduction of viscosity.
The oil heater is switched on during standstill and switched off during compressor operation.
4.1.3
Cylinder head and motor cooling
Under some conditions, additional cooling is needed as the sample diagram from the BITZER
Software below shows
Legend
Additional cooling & suction gas superheat ≤20K
Additional cooling & max. suction gas temperature <0°C
Additional cooling
M1: motor 1
M2: motor 2
Operating point
The CM-RC-01 has two independent functions to apply cooling to the compressor, an additional
fan and liquid injection cooling, CIC. The two functions are controlled by the CM-RC-01 module.
The additional fan cooling and/or CIC are automatically applied, if the compressor is in an
operating point where extra cooling is needed and the compressor is equipped with these
components.
BEST Software can configure the CM-RC-01 for the mounted options.
4.1.3.1
Additional fan
The CM-RC-01 will start and stop the additional fan according to the application limits for the
compressor and the selected refrigerant. The control algorithm in the CM-RC-01 starts the
additional fan if the discharge gas temperature gets too high.
It is for additional cooling of the compressor motor and cylinder heads.
When started, the fan will keep running for a certain minimum period, and until the temperature
drops to an acceptable level.
A warning message is displayed if the fan needs to be started too often.
