Defrost Control - Danfoss AK-CC55 Water Loop User Manual

AK-CC55 Water Loop
Function Description
Door restart inj. de- Start of refrigeration when the door is open. If the
lay door has been left open, refrigeration will be started
after the set time.
Alarm delay DI 1 Time delay for digital input alarm
Alarm delay DI 2 Time delay for digital input alarm

Defrost control

Table 23: Defrost control
Function Description
Control state A Readout of the actual control state of the controller
Defrost sensor tem- Actual temperature of selected defrost stop sensor
perature A
S5 Evaporator A Actual sensor value
Defrost A Actual status of output function
Defrost time A Read the duration of the ongoing defrost or the dura-
tion of the last completed defrost.
Start defrost Command for starting a defrost
Stop defrost Command for stopping an ongoing defrost cycle
Defrost method Select method of defrost
Defrost stop meth- Here you define whether a defrost cycle is to be stop-
od ped by time or by a temperature sensor
Defrost stop limit 1 When the selected defrost stop sensor reaches the set
limit, the defrost cycle is terminated
Defrost stop limit 2 Defrost stop temperature limit when thermostat band
2 is in operation.When the selected defrost stop sen-
sor reaches the set limit, the defrost cycle is termina-
ted
Min. defrost time Min. duration of a defrost cycle. The defrost cycle will
as a minimum run for the set minimum defrost time
once it is started
Max. defrost time 1 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.
Max. defrost time 2 Max duration of a defrost cycle when thermostat
band 2 is in operation. The setting is also used as a
safety time if the defrost is stopped on temperature. 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.
Defrost start interval 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
© Danfoss | Climate Solutions | 2022.04
Values
Values
0=Normal ctrl., 1=Hold after defrost, 2=Min ON timer,
3=Min OFF timer, 4=Drip off, 10=Main switch OFF,
11=Thermostat cut-out, 12=Frost protection S4,
14=Defrost, 15=Fan delay, 17=Door open, 18=Melt
period, 19=Modulating temp. control, 20=Emergency
control, 25=Manual control, 29=Case cleaning,
30=Forced cooling, 32=Power-up delay, 33=Air heat-
ing, 34=Comp. safety cut-out, 45=Shut down control-
ler, 50=High S7 Brine inlet
0=OFF, 1=ON
0=OFF, 1=ON
0=OFF, 1=ON
0=None, 1=Electrical, 2=Hot gas, 4=Air/Offcycle
0=Time, 1=S5 sensor, 2=S4 sensor
Code Short name
o89 o89 DoorInjStart
A27 A27 Al.Delay DI1
A28 A28 Al.Delay DI2
Code Short name
u00 u00 Ctrl. state
U73 U73 Def.StopTemp
u09 u09 S5 temp.
u60 u60 Def. relay
u11 u11 Defrost time
x09 --- Def. Start
x10 --- Def. Stop
d01 d01 Def. method
d10 d10 DefStopSens.
d02 d02 Def.StopTemp
d28 d28 DefStopTemp2
d24 d24 Min Def Time
d04 d04 Max Def.time
d29 d29 MaxDefTime2
d03 d03 Def.Interval
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