Defrost control
Table 33: Defrost control
Readout of the actual control state of the controller
0=Normal ctrl., 1=Hold after defrost, 2=Min ON timer,
3=Min OFF timer, 4=Drip o, 10=Main switch OFF,
11=Thermostat cut-out, 12=Frost protection S4,
13=Not_used, 14=Defrost, 15=Fan delay, 17=Door
open, 18=Melt period, 19=Modulating temp. control,
20=Emergency control, 23=Adaptive superheat con-
trol, 24=Start injection, 25=Manual control, 26=No re-
frigerant selected, 16=Forced closing, 29=Case clean-
ing, 30=Forced cooling, 31=Door open, 32=Power-up
delay, 33=Air heating, 45=Shut down controller,
48=Adaptive liquid control
Defrost sensor tem-
perature A
Actual temperature of selected defrost stop sensor
Actual status of output function
Actual status of output function
Read the duration of the ongoing defrost or the dura-
tion of the last completed defrost.
Actual state of the adaptive defrost function
0=OFF, 1=Error, 2=Tuning, 3=OK, 4=Little ice, 5=Medi-
um ice, 6=Heavy ice
Number of defrosts carried out since the initial pow-
er-up or since the resetting of the function
Accumulated skip-
ped defrosts
Number of defrosts skipped since the initial power-up
or since the resetting of the function
Average value of the condensing temperature signal
distributed via the system manager to the case con-
trollers that are using adaptive defrost. At transcritical
CO2 sites the receiver pressure is distributed to the
case controllers. The function needs to be set up in
the system manager.
Command for starting a defrost
Command for stopping an ongoing defrost cycle
0=None, 1=Electrical, 2=Hot gas, 4=Air/Ocycle
Here you dene whether a defrost cycle is to be stop-
ped by time or by a temperature sensor
0=Time, 1=S5 sensor, 2=S4 sensor, 3=S5A and S5B
When the selected defrost stop sensor reaches the set
limit, the defrost cycle is terminated
Max duration of a defrost cycle. The setting is also
used as a safety time if the defrost is stopped on tem-
perature. If the selected defrost stop sensor does not
reach the set defrost stop temperature limit within
the set time, the defrost will be stopped anyway.
The function is zeroset and will start the timer func-
tion at each defrost start. When the time has expired
the function will start a defrost. The function is used
as a simple defrost start, or it may be used as a safe-
guard if the normal signal fails to appear. If master/
slave defrost without clock function or without data
communication is used, the interval time will be used
as max. time between defrosts. If a defrost start via
data communcation does not take place, the interval
time will be used as max. time between de-
frosts.When there is defrost with clock function or da-
ta communication, the interval time must be set for a
somewhat longer period of time than the planned
one. In connection with power failure the interval
time will be maintained, and when the power returns
the interval time will continue from the maintained
value. he interval time is not active when set to 0
AK-CC55 Single Coil and Single Coil UI
© Danfoss | Climate Solutions | 2021.02 BC364229688105en-000101 | 54
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