AK-PC
560
Manual RS8GE202 © Danfoss 01-2016
23
3. P regulation with fixed setting
As ”1”, but an increasing deviation from the reference must be
accepted as the controller uses the difference 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
D
T 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 floating reference
As ”2”, but an increasing deviation from the reference must be
accepted as the controller uses the difference between the actual
condenser temperature and the actual outdoor temperature for
indicating the number of fans that has to be cut in. (The first "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
D
T 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).