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6 Operation
6
Operation
EN
You can operate the cooling unit using the display
(controller) on the front of the device (Fig. 1, no. 4,
page 25).
6.1 Control using the Comfort controller
For unit types SK xxxx.500/.510/.540 and
SK xxxx.600/.610/.640.
4
Fig. 8:
Comfort controller
Legend
1
Programming button, also display of the set
temperature unit (degrees Celsius)
2
Set button
3
Programming button, also display of the set
temperature unit (degrees Fahrenheit)
4
7-segment display
6.1.1 Properties
– Voltage variant: 400/460 V, 3-phase
– Supports multiple voltages without rewiring
– Integral start-up delay and door limit switch
function
– Protective function to prevent icing
– Monitoring of all motors (compressor, condenser
fan, evaporator fan)
– Phase monitoring for three-phase units
– Switching hysteresis: Settable from 2 – 10 K,
preset to 5 K.
– Visualisation of the current safe internal tempera-
ture and all error messages in the 7-segment
display.
– Using an interface card (Model No. SK 3124.100),
the unit may be incorporated into higher-level
remote monitoring systems such as the RITTAL
Computer Multi Control CMC.
The cooling unit operates automatically, i.e. after
switching on the power supply, the evaporator fan
(see Fig. 2, page 25) will run continuously and per-
manently circulate the safe internal air. The compres-
sor and condenser fan are regulated by the Comfort
controller.
32
1
2
3
The Comfort controller has a 7-segment display
(Fig. 8, no. 4). After switching on the power supply,
the current software version is initially displayed for
approximately 2 seconds, followed by a preset op-
tion (e.g. t10) or the temperature. In regular opera-
tion, the display shows both the temperature (in
degrees Celsius or Fahrenheit – users may switch
between the two) and any error messages. The
current security safe 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. 8).
The relevant parameters also appear in the display.
6.1.2 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.
• Simultaneously press buttons 1 and 2 (Fig. 8) for at
least 5 seconds.
The cooling unit will commence operation.
Test mode is completed after approximately 5 min-
utes. The unit switches off and changes to normal
operation.
6.1.3 General programming information
Using buttons 1, 2 and 3 (Fig. 8) you can change
24 parameters within the preset ranges (min. value –
max. value).
Tables 3 and 4 show the parameters which can be
altered. Fig. 9 on page 34 shows which buttons must
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 safe are cooled.
Note on temperature settings:
With the Comfort controller, the temperature
is preset at the factory to +35°C.
In order to save energy, and due to the risk
of increased condensation, do not set the
temperature lower than that actually neces-
sary.
Note on useful cooling output:
Interactive performance diagrams for
calculating the useful cooling output may
be found at www.rittal.com
RITTAL Compact split cooling unit assembly and operating instructions
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