20 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Melt function
Only for control of refrigeration (-5 to +10°C). The function ensures that the
evaporator will not be blocked by frost. Here you set how often the function is
to stop the refrigeration and hence transform the frost to water (or ice if there is
too much frost).
r16 MeltInterval
Melt period
Here you set how long an on-going melt function is to last.
r17 Melt period
Set point 2
The thermostat’s cutout value when the thermostat band 2 is activated via a digital
input.
r21 Cutout2 temp
Correction of signal from S6
Compensation possibility due to long sensor cable
r59 Adjust S6
Correction of signal from S6B
Compensation possibility due to long sensor cable
r60 Adjust S6B
Selection of thermostat sensor S4% during night operation or night blinds down
Here you dene the sensor the thermostat is to use for its control function. S3, S4, or
a combination of them. With the setting 0%, only S3 is used (Sin). With 100%, only S4.
r61 Ther.S4% Ngt
Heat function
Set the size of the Neutral Zone for changeover from cooling to heating
r62 Heat NZ
Time delay on transition from refrigeration phase to heating phase.
(there is not time delay on transition from heating phase to refrigeration phase).
The heating function is not active when the delay time is set to the max. value
(240 min.).
r63 HeatStartDel
Product type
This function sets the temperature reference and associated alarm limits.
1=Vegetables, 8°C. 2=Milk, 0°C. 3=Meat/sh, -2°C. 4=Freeze, -20°C. 5=Ice, -24°C.
See overview on page 33.
r89
Night setbck
(start of night signal. 0=Day, 1=Night)
Alarm Alarm settings
The controller can give alarm in dierent situations. When there is an alarm all the
light-emitting diodes (LED) will ash on the controller front panel, and the alarm
relay will cut in.
With data communication the impor-
tance of the individual alarms can be
dened. Setting is carried out in the
“Alarm destinations” menu via AKM.
Alarm delay (short alarm delay on air temperature)
If the upper or the lower alarm limit values are exceeded, a timer function will
commence. The alarm will not become active until the set time delay has been
passed. The time delay is set in minutes.
A03 Alarm delay
Time delay for door alarm
The time delay is set in minutes.
The function is dened for a DI function, see o02, o37 or other DI.
A04 DoorOpen del
Time delay for cooling (long alarm delay)
This time delay is used during start-up, during defrost, immediately after a defrost.
There will be change-over to the normal time delay (A03) when the temperature
has dropped below the set upper alarm limit.
The time delay is set in minutes.
A12 Pulldown del
Upper alarm limit
Here you set when the alarm for high temperature is to start. The limit value is set
in °C (absolute value).
The limit value will be raised during night operation. The value is the same as the one
set for night setback, but will only be raised if the value is positive.
In application 3 and 6, the setting is the same for S3 and S3B.
A13 HighLim Air
Lower alarm limit
Here you set when the alarm for low temperature is to start. The limit value is set in °C
(absolute value).
In application 3 and 6, the setting is the same for S3 and S3B.
A14 LowLim Air
Upper alarm limit for thermostat 2 (Thermostat band 2)
(Same function as for thermostat 1)
A20 HighLim2 Air
Lower alarm limit for thermostat 2 (Thermostat band 2)
(Same function as for thermostat 1)
A21 LowLim2 Air
Upper alarm limit for S6 temperature at thermostat 1 A22 HighLim1 S6
Lower alarm limit for S6 temperature at thermostat 1 A23 LowLim1 S6
Upper alarm limit for S6 temperature at thermostat 2 (Thermostat band 2) A24 HighLim2 S6
Lower alarm limit for S6 temperature at thermostat 2 (Thermostat band 2) A25 LowLim2 S6
S6 temperature alarm delay
The alarm is activated if one of the relevant alarm limits A22, A23, A24 or A25 is
exceeded. The time delay is set in minutes.
(Alarms will not activate when the setting is set to the maximum value. 240 min.)
A26 Al. Delay S6
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