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The cooling unit operates automatically i.e. after
switching on the power supply, the evaporator fan
(see page 5, Fig. 2) will run continuously and perma-
nently circulate the internal enclosure air. The com-
pressor and condenser fan are regulated by the
Comfort controller.
The Comfort controller has a 7-segment display
(Fig. 36, no. 4). After switching on the power supply,
the current software version initially appears on this
display for approx. 2 seconds. In regular operation,
the display shows both the temperature (in degrees
Celsius or Fahrenheit – users may switch between
the two) and any error messages.
The current enclosure internal temperature is usually
displayed permanently. In the event of an error mes-
sage, this will alternate with the temperature display.
The unit is programmed using buttons 1 – 3 (Fig. 36).
The relevant parameters likewise appear in the dis-
play.
6.2.2 Launching test mode
The Comfort controller is equipped with a test func-
tion whereby the cooling unit commences cooling
operation independently of the set temperature or
door limit switch function.
• Press buttons 1 and 2 simultaneously (Fig. 36) for
at least 5 sec.
The cooling unit will commence operation.
After approximately 5 minutes or upon reaching
15°C, test mode will end. The device cuts out and
changes to normal operation.
6.2.3 General information about programming
Using buttons 1, 2 and 3 (Fig. 36) you can change
24 parameters within the preset ranges (min. value –
max. value).
Tables 4 and 5 show the parameters you are able to
change. Fig. 37 of page
27
need to be pressed.
Note on switching hysteresis:
With a low hysteresis and short switching
cycles, there is a risk that cooling may not
be adequate or that only partial sections of
the enclosure are cooled.
Note on temperature settings:
With the Comfort controller, the temperature
is preset in the factory to +35°C.
In order to save energy, do not set the
temperature any lower than is actually
necessary.
Note on useful cooling output:
Interactive performance diagrams for
calculating the useful cooling output may
be found at www.rittal.com.
Rittal cooling unit assembly instructions
shows which buttons
In principle, programming is identical for all variable
parameters.
To enter programming mode:
• Press button 2 ("Set") for approx. 5 seconds.
The controller is now in programming mode. While in
programming mode, if you do not press any buttons
for approx. 30 seconds, the display will first flash,
then the controller will switch back to normal display
mode. The display "Esc" indicates that any amend-
ments made have not been saved.
• Press the programming buttons s (°C) or
to switch between the settable parameters
(see Tables 4 and 5).
• Press button 2 ("Set") to select the displayed
parameter for editing.
The current value of this parameter is displayed.
• Press one of the programming buttons s (°C) or
(°F).
The display "Cod" will appear. In order to be able to
change a value, you must enter the authorisation
code "22".
• Keep the programming button s (°C) held down
until "22" appears.
• Press button 2 ("Set") to confirm the code.
You can now alter the parameter within the preset
limits.
• Press one of the programming buttons s (°C) or
(°F) until the required value appears.
• Press button 2 ("Set") to confirm the amendment.
You can now alter other parameters in the same way.
There is no need to re-enter the authorisation code
"22".
• To exit programming mode, press button 2 ("Set")
for a further 5 seconds or so.
"Acc" will appear in the display to indicate that the
changes have been saved. The display will then
switch back to regular operation (enclosure internal
temperature).
You can also program the Comfort controller using
a diagnosis software package (Model No.
SK 3159.100), the supply of which also includes a
connection cable to the PC. The cable connector on
the rear of the Comfort controller display serves as
an interface.
6 Operation
(°F)
25
GB
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