Eliwell EWCM 4120, Manual, Page: 32 / 75

One or more digital inputs can be configured as compressor block inputs:

Digital inputs DI1…DI7.
 Analogue inputs AI3 …AI4 if configured as digital inputs.
It is also possible to configure a relay as compressor INVERTER enabling output.
Inverter compressor control
The operating mode depends on parameter ST02 . Cold mode St02=1. Hot mode St02=0.
The inverter compressor control is proportional as a function of the inlet probe value. The following diagram
indicates the compressor speed as a function of the regulation probe in the case of regulation with lateral set point
(St01=1). In the case of central set point (St01=0), the proportional band is centred in the set point:
CP06 CP04 CP03
CP00
CP20
CP19
CP18
OFF
CP07 CP05
A
B
CP06 CP04
CP03
CP00
CP07 CP05
A
B
Cooling (St02 = 1) Heating (St02 = 0)
Speed
%
(°C/°F/Bar/Psi)
Keys
A Minimum cut-off
B Saturation cut-off
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