12
Function description
RC.1J.Z4.02
©
Danfoss
09/1999
AKC 25H1
Monitoring of maximum discharge gas temperature
This function gradually cuts out compressor steps, if the discharge gas temperature becomes
higher than the permitted value. The cut out limit can be defined in the range between 0 and
+150
°
C.
The discharge gas temperature is measured with the temperature sensor on the Sd input (this
sensor should always be mounted).
The function starts with a value that is 10 K below the set value. At this point the entire
condenser capacity is cut in at the same time as half of the compressor capacity is cut out.
The alarm function is activated.
If the temperature rises to the set limit value, all compressor steps are immediately cut out,
and the function “AKC ON” is interrupted.
The alarm ceases when the temperature has dropped to the 10 K below the limit value for 60
seconds
Renewed cut in of the compressor step is allowed when the following conditions are
complied with:
- the temperature has dropped to the 10 K below the limit value
Safety functions
Limits with 1.Priority
Sd Max
°
C ___
Monitoring of maximum discharge pressure
The function cuts in all condenser steps and gradually cuts out compressor steps, if the
condensing pressure exceeds the permitted value. The cut out limit can be defined in the
range between -30 and +70
°
C.
The condensing pressure is measured with the pressure transmitter on the Pc input.
The function starts at a value that is 3 K below the set value. At this point the entire condenser
capacity is cut in at the same time as half of the compressor capacity is cut out. The alarm
function is activated.
If the temperature (pressure) rises to the set limit value, the following happens:
- all compressor steps are immediately cut out
- the condenser capacity remains cut in
- the function “AKC ON” is interrupted.
The alarm ceases again when the temperature (pressure) has dropped to the 3 K below the
limit value for 60 seconds.
Renewed cut in of compressor steps is allowed when the following conditions are complied
with:
- the temperature (pressure) has dropped to the 3 K below the limit value
Safety functions
Limits with 1.Priority
Pc Max
°
C ___
Monitoring