Danfoss AK2-SC 255 Reference Manual page 133

Alarms for EKC, DCU
Degree Master,
and AKC 165 Subcooling
controllers
132
The embedded alarms and their meanings are as follows:
Low Superheat
Occurs when the difference between the inlet (liquid in) and outlet (gas out) tempera-
tures sensors is too low. This could be caused by the evaporator being overfilled with
liquid refrigerant. In response to this condition, the AKC 164 will tend to close the
AKV electronic expansion valve.
Defrost exceeded
Occurs if an evaporator is configured to terminate defrost at a set temperature if the
termination temperature was not reached before the specified time expired.
Fan start timeout
Occurs when the fan is configured to start at a specified temperature after termina-
tion of defrost, and the specified temperature is not reached before the time set for
fan delay expires.
Drip pan clogged
Occurs when a clogged drain is sensed due to standing water in the fixture drip pan.
Box door open
(a door switch must be installed and connected to the AKC 164 for this alarm)
Occurs when the box door is open past the specified delay time.
Power failure
Occurs when the AKC 164 resumes operation following interruption of power.
Hardware failure
Occurs upon detection of one or more internal AKC 164 hardware failures. Replace-
ment of the AKC 164 may be necessary.
Sensor fail alarms
Occur when the AKC 164 detects failure of one or more of its sensors.
Configuration of alarms for these controllers is not covered in this manual, but in the
separate literature for the individual controllers.
AK2-SC 255 Reference Manual RS.8D.M1.22