AKC 25H1 Function description RC.1J.Z4.02 © Danfoss 09/1999 3
Introduction AKC 25H1 is a complete control unit for capacity regulation of compressors and condensers
in commercial refrigeration.
The controller can be used in combination with other controllers in the Danfoss ADAP-KOOL
®
refrigeration control system.
In addition to capacity regulation the controller can transmit signals to other controllers about
operating conditions, e.g. forced closing of expansion valves, alarm signals and alarm
messages.
The controller’s main function is to control the compressors and condensers, so that they will
constantly operate at the optimum pressure conditions from an energy point of view. Both
suction pressure and condensing pressure will be controlled by signals from pressure
transmitters type AKS 32.
Among the various functions can briefly be mentioned:
- It can control a total of nine capacity steps distributed on compressor steps and condenser
steps, as required.
- There are nine digital imputs for monitoring the various automatic controls. The inputs can
be defined to monitor compressors, condensers or other ON/OFF signals, at your option. If
failure of a compressor is registered, the controller will control the capacity with the
remaining compressors.
- When the compressors stop, signals may be transmitted to the electronic expansion valves,
so that they close.
- LED’s on the front plate show the status of outputs and inputs.
- Alarm signals can be generated directly from the controller and via DANBUSS Data
Communication.
- Alarms are displayed with texts, so that it is easy to see the cause of the alarm.
The monitoring of a compressor’s safety
circuit may be extended from being a simple
type of monitoring to a more differentiated
monitoring of several parts of the safety
circuit. To achieve this, the controller must
be linked up with an alarm module type AKC
22H. This alarm module will then receive
signals from the different parts of the safety
circuit and will subsequently give an exact
report on the exact location of the problems
in the circuit.
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