Rittal SK 3302.3 series Assembly And Operating Instructions Manual - 6 Operation
26
RITTAL cooling unit assembly and operating instructions
6 Operation
EN
6.2 Control using the Comfort controller
For unit types SK xxxx.500/.510/.540 and
SK xxxx.600/.610/.640.
Fig. 38:
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
6.2.1 Properties
– Three voltage variants are supported:
– 115 V
– 230 V
– 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
– Master-slave function with a maximum of ten units.
One device functions as a master unit. Once the
set temperature is reached by one of the connect-
ed slave devices or in the event of the door limit
switch function, the affected slave unit will report
to the master unit, which will switch all the other
cooling units on or off as required.
– Switching hysteresis: Adjustable within the range
2 – 10 K, preset to 5 K.
– Visualisation of the current enclosure internal tem-
perature 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 5) will run continuously and per-
manently circulate the internal enclosure air. The
compressor and condenser fan are regulated by the
Comfort controller.
The Comfort controller has a 7-segment display
(Fig. 38, no. 4). After switching on the power supply,
the current software version is initially displayed for
approximately 2 sec., followed by a preset option
(e.g. t10) or the temperature.
In regular operation, the display shows both the tem-
perature (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. 38).
The relevant parameters also appear in the display.
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.
• Simultaneously press buttons 1 and 2 (Fig. 38)
for at least 5 sec.
The cooling unit will commence operation.
After approximately 5 minutes, test mode will end.
The unit switches off and changes to normal oper-
ation.
6.2.3 General programming information
Using buttons 1, 2 and 3 (Fig. 38) you can change
24 parameters within the preset ranges (min. value –
max. value).
Tables 4 and 5 show the parameters which can be
altered. Fig. 39 of page 28 shows which buttons
must be pressed.
1
2
4
3
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 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
necessary.
Note on useful cooling output:
Interactive performance diagrams for
calculating the useful cooling output may
be found at www.rittal.com.