Master control signal for starting a defrost. At adap-
tive defrost the defrost might be skipped if the de-
frost is not needed.
Read out the actual state of the defrost
Master control signal used for co-ordinated defrost
control to hold cabinets from returning to normal re-
frigeration after a defrost until all cabinets have termi-
nated defrost.
Master control signal used to prevent a defrost start in
a controller.
Master control signal for control of light via a data
communication signal from the system manager.
Master control signal sending the actual measured
dewpoint from the system manager to the controller
over the network.
Master control signal that will lock down all Bluetooth
data communication and optionally also the opera-
tion of the display keys (depend upon selection in
P89 Display keyboard lock).
Master control signal used to control the load balance
between multiple case controllers on the same suc-
tion line
Master control signal for starting condenser fan in
plug-in cabinets in order to reclaim heat in the store.
Fault message
In an error situation the alarm LED on the front will be on and the alarm relay will be activated (depending on
priority). If you push the alarm button for 3 seconds you can see the alarm report in the display. (Alarm priorities can
be changed. See the Alarm relay priorities.) Here are the messages that may appear:
Table 37: Fault message
The controller has a hardware failure
Clock has lost valid time
S3 Air ON evap. A - sensor error
Sensor signal is out of range. Please check the sensor for correct operation
S4 Air OFF evap. A - sensor error
Sensor signal is out of range. Please check the sensor for correct operation
S5 Evaporator A - sensor error
Sensor signal is out of range. Please check the sensor for correct operation
S7 Brine inlet temp. sensor error
Sensor signal is out of range. Please check the sensor for correct operation
S8 Brine outlet temp. sensor error
Sensor signal is out of range. Please check the sensor for correct operation
The alarm temperature has been above the max alarm limit for a longer time period than the set alarm de-
lay.
The alarm temperature has been below the min alarm limit for a longer time period than the set alarm de-
lay.
The door has been open for a too long time
Max defrost hold time exceeded
The controller has been waiting longer time than permitted after a co-ordinated defrost.
Alarm signal from digital input signal
Alarm signal from digital input signal
Alarm from digital input monitoring function
The controller manin switch has been set to either Stop or Manaual control. Alternatively a digital input set
up for "main switch" function, has stopped control
A case cleaning operation has been started on a case
Alarm from digital input monitoring function
Refrigerant leak detected
Refrigerant is leaking from the refrigeration system
The S7 brine temperature has exceeded the set maximum temperature alarm limit
Inputs and outputs have not been
congured correctly
Max defrost time exceeded A
The last defrost cycle has stopped on time instead of set temperature
NOTE:
Data communication
The importance of individual alarms can be dened with a setting. The setting must be carried out in the group
"Alarm destinations".
AK-CC55 Water Loop
© Danfoss | Climate Solutions | 2022.04 BC378540472015en-000101 | 60
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