Danfoss AK-CC55 - Thermostat Control Parameters; Thermostat State, Timing, and Limits; Thermostat Sensor S4% and Night Offset

Thermostat control
Table 29: Thermostat control
Function
Description
Values
Code
Short name
Control state A
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
u00
u00 Ctrl. state
Thermostat air
temp. A
Thermostat temperature
u17
u17 Ther. air
Food temperature A
Readout of food temperature
U72
U72 Food temp.
S3 Air ON evap. A
Actual sensor value
u12
u12 S3 air temp.
S3 Air ON evap. B
Actual sensor value
u76
u76 S3 airtemp B
S4 Air OFF evap. A
Actual sensor value
u16
u16 S4 air temp.
Night condition
Status of the day/night operation (night operation:
on/o)
0=OFF, 1=ON
u13
u13 Night Cond.
Thermostat cut-in
temp.
Readout of the actual cut-in value for the thermostat
u90
u90 Cutin temp.
Thermostat cut-out
temp.
Readout of the actual cut-out value for the thermo-
stat
u91
u91 Cutout temp.
Thermostat run time
A
Read the ongoing cut-in time for the thermostat or
the duration of the last completed cut-in
u18
u18 Ther runtime
Thermostat band
Readout of which thermostat is used for regula-
tion:1= Thermostat band 12= Thermostat band 2
1=Band 1, 2=Band 2
u86
u86 Ther. band
Air heater
Actual status of output function
0=OFF, 1=ON
u84
u84 Heat relay
Thermostat mode
Here it is dened how the thermostat is to be operat-
ed. Either as an ordinary ON/OFF thermostat or as a
modulating thermostat.When operation is ”modulat-
ing” the valve will limit the ow of refrigerant so that
the temperature variation will be less than for the
ON/OFF thermostat.The thermostat dierential (r01)
must not be set lower than 2K for ""modulating"".In a
decentralised plant you must select the ON/OFF ther-
mostat setting."
1=ON/OFF, 2=Modulating
r14
r14 Therm. mode
Cut-out 1
Setpoint. The thermostat’s cut-out value when the
given thermostat band is in use
r00
r00 Cutout
Cut-out 2
Setpoint. The thermostat’s cut-out value when the
given thermostat band is in use
r21
r21 Cutout 2
Dierential
When the temperature is higher than the set cut-out
+ the set dierential, the compressor relay will be cut-
in. It will cut-out again when the temperature comes
down to the set cut-out limit
r01
r01 Dierential
Max cut-out limit
Setpoint limitation - The controller’s setting range for
the thermostat setpoint may be narrowed down, so
that too high or too low values are not set accidental-
ly - with resulting damages.To avoid a too high set-
ting of the setpoint, the max. allowable reference val-
ue may be lowered
r02
r02 Max cutout
Min cut-out limit
Setpoint limitation - The controller’s setting range for
the thermostat setpoint may be narrowed down, so
that too high or too low values are not set accidental-
ly - with resulting damages.To avoid a too low setting
of the setpoint, the min. allowable reference value
may be increased
r03
r03 Min cutout
Thermostat sensor
S4 %
Selection of thermostat sensor. Here you dene the
sensor that the thermostat is to use for its control
function. S3, S4, or a combination of them. With the
setting 0%, only S3 is used. With 100%, only S4.
r15
r15 Ther. S4 %
Thermostat sensor
S4 % night
Selection of thermostat sensor S4% during night op-
eration with night blinds. Here you dene the sensor
that the thermostat is to use for its control function.
S3, S4, or a combination of them. With the setting 0%,
only S3 is used. With 100%, only S4.
r61
r61 Ther.S4% Ngt
Night oset
Night setback value.The thermostat’s reference will
be the setpoint plus this value when the controller
changes over to night operation.
r13
r13 Night oset
AK-CC55 Single Coil and Single Coil UI
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