Survey Of Functions; Normal Display; Thermostat Function - Danfoss AK-CC55 User Manual

User Guide | Controller for appliance control, AK-CC55

Survey of functions

Function

Normal display

Normally the temperature value from one of the two thermostat sensors S3 or S4 or a
mixture of the two measurements is displayed.
In o17 the ratio is determined.
Thermostat
Setpoint
Regulation is based on the set value plus a displacement, if applicable. The value is set
via a push on the centre button.
The set value can be locked or limited to a range with the settings in r02 and r03.
The reference at any time can be seen in "u91 Cut-out temp".
Differential
When the temperature is higher than the reference + the set differential, the
compressor relay will be cut in. It will cut out again when the temperature comes
down to the set reference.
Setpoint limitation
The controller's setting range for the setpoint may be narrowed down, so that much
too high or much too low values are not set accidentally - with resulting damages.
To avoid a too high setting of the setpoint, the max. allowable reference value may be
lowered.
To avoid a too low setting of the setpoint, the min. allowable reference value may be
increased.
Temperature unit
Set here if the controller is to show temperature values in °C or in °F.
Correction of signal from S4
Compensation possibility due to long sensor cable
Correction of signal from S3
Compensation possibility due to long sensor cable
Start / stop of refrigeration
With this setting, refrigeration can be started, stopped or a manual override of the
outputs can be allowed. (For manual control the value is set at -1.)
Start / stop of refrigeration can also be accomplished with the external switch
function connected to a DI input.
Stopped refrigeration will give a "Standby alarm".
Night setback value
The thermostat's reference will be the setpoint plus this value when the controller
changes over to night operation. (Select a negative value if there is to be cold
accumulation.)

Thermostat function

Here it is defined how the thermostat is to operate. Either as an ordinary ON/OFF
thermostat or as a modulating thermostat.
1: ON/OFF thermostat
2: Modulating
3: (Multi Coil only) = shared on/off thermostat for all sections. See also r99
When operation is "modulating", the AKV valve will limit the flow of refrigerant so that
the temperature variation will be less than for the ON/OFF thermostat.
The differential (r01) must not be set lower than 2K for "modulating" when controlled
using S3 sensors. For S4 sensors it must be even higher, e.g. 4 K.
In systems with 1 compressor and 1 evaporator you must select the ON/OFF
thermostat setting.
Selection of thermostat sensor during day operation
Here you define the thermostat sensor for day operation - S3, S4, or a combination of
them. With the setting 0%, only S3 is used (Sin). With 100%, only S4.
© Danfoss | DCS (vt) | 2019.09
Ref. Dif.
Para- Parameter by operation via data
meter communication
Display air (u56)
Thermostat control
r00 Cutout °C
r01 Differential
r02 Max. cut-out °C
r03 Min. cut-out °C
r05 Temp. unit
°C=0. / °F=1
(Only °C on AKM, whatever the
setting)
r09 Adjust S4
r10 Adjust S3
r12 Main Switch
1: Start
0: Stop
-1: Manual control of outputs allowed
r13 Night offset
r14 Therm. mode
r15 Ther. S4 %
BC308437742037en-000101 | 47