AK-PC 572 User Guide RS8KH202 © Danfoss 2019-03 5
Receiver control
The receiver pressure can be controlled so that it is kept at the
desired reference point. This reference point is fixed at 6 bar above
the reference point for Po-MT. This control requires the installa-
tion of an receiver valve Vrec and a pressure transmitter.
Hot gas dump
This function is possible only if there is an available DO output
This function allows for hot gas to be passed to the receiver if the
pressure approaches Po-MT.
Hot gas will be shut off again when the pressure returns above the
desired level.
Pgc ref
DI
Heat recovery
A digital input can be received.
When the signal is received, the reference for the gas cooler will
be raised to the configured value.
When the temperature of the heat recovery has been reached
and the DI signal disappears, the reference will drop once again,
though it will do so over the course of a few minutes to prevent
abrupt changes in the reference.
A potential relay outlet can be connected to heat recovery. The
potential relay is activated when the controller allows for heat
recovery.
Cooling will always have a higher priority than heat recovery. If
this higher priority occurs, the potential relay will be deactivated
and the reference for heat recovery will be removed from the
controller.
The cooling reference is now used for regulation until the tempe-
ratures and pressure allow for heat recovery to resume.
During heat recovery, regulation can be carried out in accordance
with:
• Max. COP - Most energy-optimal.
• Max. HR - The highest achievable temperature.
Warning
Remember that the controller controls the gas pressure. If the
regulation is stopped by the internal or external main switch, this
control will stop as well.
Risk of loss of charge.
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