Survey Of Functions - Hussmann RDI-27 Installation & Operation Manual

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
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 r 03.
The reference at any time can be seen in "u28 Temp. ref"
Di erential
When the temperature is higher than the reference + the set di erential, the com-
pressor 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 must
be lowered.
To avoid a too low setting of the setpoint, the min. allowable reference value must be
increased.
Correction of the display's temperature showing
If the temperature at the products and the temperature received by the controller are
not identical, an o set adjustment of the shown display temperature can be carried
out.
Temperature unit
Set here if the controller is to show temperature values in °C or in °F.
Correction of signal from S4
Compensation possibility through long sensor cable
Correction of signal from S3
Compensation possibility through 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.
Start / stop of refrigeration can also be accomplished with the external switch func-
tion 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 ac-
cumulation.)
Selection of thermostat sensor
Here you de ne 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.
(For application 9 an S3 sensor must be used)
Heating function
The function uses the defrost function's heating element for raising the temperature.
The function enters into force a number of degrees (r36) below the actual reference
and cuts out again with a di erential of 2 degrees. Regulation is carried out with
100% signal from the S3 sensor. The fans will be operating when there is heating. The
fans and the heating function will stop if door function has been selected and the
door is opened.
Where this function is used an external safety cutout should also be installed, so that
superheating of the heating element cannot take place.
Remember to set D01 to electrical defrosting.
8
Ref. Dif.
Manual RS8EP502 © Danfoss
Para- Parameter by operation via data
meter communication
Display air (u56)
Thermostat control
Cutout °C
r01 Di erential
r02 Max cutout °C
r03 Min cutout °C
r04 Disp. Adj. K
r05 Temp. unit
°C=0. / °F=1
(Only °C on AKM, whatever the set-
ting)
r09 Adjust S4
r10 Adjust S3
r12 Main Switch
1: Start
0: Stop
-1: Manual control of outputs allowed
r13 Night o set
r15 Ther. S4 %
r36 HeatStartRel
12-2015
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AK-CC 210