Danfoss AK-PC 772A User Manual page 101

Forced operation of condenser capacity
Forced operation of the capacity can be arranged where the nor-
mal regulation is ignored.
The safety functions are cancelled during forced operation.
Forced operation via setting
The regulation is set to Manual.
The capacity is set in percent of the regulated capacity.
Forced operation of relays
If the forced operation is carried out with the switches at the
front of an extension module, the safety function will register
any exceeding of values and transmit alarms, if required, but the
controller cannot cut the relays in or out in this situation.
Info
In normal operating conditions, the temperature at Sd will be be-
tween 60 and 70°C - depending on whether it is winter or summer.
If the "Heat reclaim" function is to raise the condensing pressure,
the temperature may increase to 90° or higher.
The Sc3 sensor should be positioned so that it measures the air
intake temperature for the gas cooler. If it measures a temperature
that is too high, the system's COP will become impaired.
The Sgc signal must be stable. If this cannot be done using a sys-
tem sensor, it may be necessary to use an immersion tube sensor.
If the power supply to AK-PC 772A or the high pressure valve Vhp
fails, the system cannot be controlled. We recommend installing
an emergency supply (UPS) for both the controller and the valve
to avoid faults. A relay in the UPS should be incorporated into the
controllers safety circuit so that it can restart safely.
AK-PC 772A Capacity controller RS8HF102 © Danfoss 2017-07 101