Specifications
RK0YG302 © Danfoss 04/2007 27
Additional information!
Manual: RS8ER
AK-CH 650
Example
Compressors
Compressor capacity is controlled by charge temperature S4 and
by suction pressure P0 as frost protection.
Three compressors are used with speed control on the rst com-
pressor. Pc is used for high pressure monitoring.
Pumps
Two twin pumps controlled by time-based rotation. The pumps
are monitored by a pressure dierence pressure switch. If pump
errors occur, automatic switch to the other pump takes place.
Defrosting
For defrosting the compressors are stopped and the connected
refrigeration areas are defrosted by circulation of brine. Defrost-
ing is stopped at S3 temperature with subsequent drip o delay
before the compressors are restarted.
Condenser/dry cooler
AK-PC 420 is used for:
• Fan speed control
• Three-way valve control
• Pump control
• Heat recovery control
• Capacity control from signal from condensing pressure Pc.
Injection
EKC 316A is used for optimum control of superheat.
The valve is an expansion valve with a step motor.