Danfoss ADAP-KOOL AK-PC 572 User Manual page 25

Bitzer CRII
The pulse signal can also be used to control one of the CRII with 2 unloaders (4 cylinders version).
Compressor capacity can be controlled from 10 to 100% depending on the pulsation of the unloaders.
The unloaders are connected to DO5 and DO6.
Connect compressor relay to DO-MT1.
Unloader 2 follows unloader 1
but is offset a ½ period.
Separate Sd monitoring of CRII
If separate Sd monitoring is desired, the
temperature signal must be received from a
thermostat that subsequently issues an on/
off signal to the compressor safety circuit.
Injection off
The electronic expansion valves in the cooling appliances must be
closed when all the compressors are prevented from starting. As a
result, the evaporators will not be filled with fluid that can be led
to a compressor when the regulation process restarts.
This function can be achieved through data communication.
Alternatively, wiring must be created using the compressor relays.
When all compressors have been stopped, a signal must be is-
sued to the evaporator controls that will subsequently close the
expansion valves.
AK-PC 572 User Guide RS8KH202 © Danfoss 2019-03
Unload 1
Unload 2
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