Overriding - Danfoss AKC 25H1 Description

Overriding

AKC 25H1
Forced closing signal to AKC 114, 115 and 116 controllers.
The electronic expansion valves must close, when all compressors are stopped. This is to
avoid the evaporators filling with liquid which is then passed on to a compressor when it starts
up again.
Either use the signal input "ON" on the AKC controllers.
When this signal is cut out, the controller will close the connected AKV valves.
During normal operation a 230 V signal must be transmitted to the AKC 114-116 controllers.
This signal must be supplied via the "AKC ON" relay switches. This relay is operated during
normal operation.
The "AKC ON" relay cuts out when all compressor steps are stopped.
E.g. when:
- the function switch "Main Sw." on AKC 25H1 has been put in position 0
- the "Main Switch" input is broken.
- or during normal regulation when one of the monitoring functions has cut out the regulation.
Or the "ON" signal can be transmitted via the data communication.
The override signal can be obtained in another way than through the wirings shown, but only
if a gateway type AKA 243/244 has also been fitted in the system.
The "ON" signal is here sent via DANBUSS to the gateway which will then retransmit the
message about closing to the relevant controllers. Cf. the gateway manual and AKM's
override function.
Function description RC.1J.Z4.02 © Danfoss 09/1999 11