AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 23
3. P regulation with xed setting
As ”1”, but an increasing deviation from the reference must be
accepted as the controller uses the dierence between the actual
condenser temperature and the set reference for indicating the
number of fans that has to be cut in.
The number of fan steps is divided up based on the Xp value.
Recommended setting for Xp is the DT of the condenser, typically
10 to 15 K.
The cutin and cutout of fans are shown in the drawing.
If the entire condenser capacity is controlled by speed regulation,
the capacity will be indicated on the broken line.
4. P regulation with oating reference
As ”2”, but an increasing deviation from the reference must be
accepted as the controller uses the dierence between the actual
condenser temperature and the actual outdoor temperature for
indicating the number of fans that has to be cut in. (The rst "r56-
degrees" are left out, as there must be a possibility of cooling via
the condenser).
The number of fan steps is divided up based on the Xp value.
Recommended setting for Xp is the DT of the condenser, typically
10 to 15 K.
The cutin and cutout of fans are shown in the drawing.
If the entire condenser capacity is controlled by speed regulation,
the capacity will be indicated on the broken line.
Ref
Ref
Important settings for avoiding unwanted alarms
When r33 = 1 or 2:
Set Pc ref max. to at least 5 K under Pc max. (A30).
When r33 = 3 or 4:
Set Pc ref max. to at least (Xp value +5) K under Pc max. (A30).
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