8
Manual RS8DZ702 © Danfoss 03-2012 EKC 202 / 302
Functions
Here is a description of the individual functions.
A controller only contains this part of the functions. Cf. the menu survey.
Function
Para-
meter
Parameter by operation via data com-
munication
Normal display
Normally the temperature value from thermostat sensor Sair is displayed.
Display air (u69)
Thermostat
Thermostat control
Set point
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 ”u28 Temp. ref”
Cutout °C
Differential
When the temperature is higher than the ref the set differential, the compressor relay
will be cut in. It will cut out again when the temperature comes down to the set reference.
r01
Differential
Set point limitation
The controller’s setting range for the set point 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 set point, the max. allowable reference value must be lowered.
r02
Max cutout °C
To avoid a too low setting of the set point, the min. allowable reference value must be increased.
r03
Min cutout °C
Correction of the display’s temperature showing
If the temperature at the products and the temperature received by the controller are not identi
-
cal, an offset adjustment of the shown display temperature can be carried out.
r04
Disp. Adj. K
Temperature unit
Set here if the controller is to show temperature values in °C or in °F.
r05
Temp. unit
°C=0. / °F=1
(Only °C on AKM, whatever the setting)
Correction of signal from Sair
Compensation possibility through long sensor cable
r09
Adjust Sair
Start / stop of refrigeration
With this setting refrigeration can be started, stopped or a manual override of the outputs can
be allowed.
Start / stop of refrigeration can also be accomplished with the external switch function con
-
nected to the DI input.
Stopped refrigeration will give a ”Standby alarm”.
r12
Main Switch
1: Start
0: Stop
-1: Manual control of outputs allowed
Night setback value
The thermostat’s reference will be the set point plus this value when the controller changes over
to night operation. (Select a negative value if there is to be cold accumulation.)
r13
Night offset
Activation of reference displacement
When the function is changed to ON the thermostat differential will be increased by the value in
r40. Activation can also take place via input DI (defined in o02).
r39
Th. offset
Value of reference displacement
The thermostat reference and the alarm values are shifted the following number of degrees
when the displacement is activated. Activation can take place via r39 or input DI
r40
Th. offset K
Night setbck
(start of night signal)
Ref.
Dif.