Condenser Monitoring And Control - Danfoss AK-CC55 Water Loop User Manual

AK-CC55 Water Loop

Condenser monitoring and control

Selection of condenser sensors
The selection of condenser sensors is done via the parameter "P99 Condenser sensors" with the following options:
0= None
1= S7
2= S7 and S8
The S7 brine inlet temperature is used to monitor the temperature of the brine entering the condenser. Optionally, a
second S8 brine outlet temperature can be defined to monitor the brine outlet temperature of the condenser. The
S8 sensor will be connected on the AI5/DI1 input of the controller, meaning that the DI input will be omitted.
Figure 22: Selection of condenser sensors
S
8
S
7
High S7 Brine inlet temperature
The temperature at the brine inlet is monitored by the S7 temperature sensor. If the temperature gets higher than
the set value, an alarm will be generated and the controller will reduce the cooling capacity, so that the load on the
heat exchanger is reduced. Once the S7 temperature has dropped with the set alarm differential, normal capacity
control is resumed.
With variable speed control the compressor speed will be reduced to the value defined by parameter "c93 Speed
emergency".
For two-compressor operation, one compressor will be taken out of operation.
For single step compressor, only the alarm will be generated as the compressor capacity cannot be reduced, without
full loss of cooling.
The high S7 temperature monitoring is not enabled for the brine pump applications as there is no condenser
present.
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