6 Operation
RITTAL cooling unit assembly and operating instructions 23
EN
6 Operation
You can operate the cooling unit using the controller
on the front of the device (Fig. 1, no. 11, page 5).
Depending on the model, the unit is equipped with
a Basic or Comfort controller.
6.1 Control using the Basic controller
For unit types SK xxxx.100/.110/.140 and
SK xxxx.200/.210/.240/.300/.310.
Fig. 36: Basic controller
Legend
1 Controller trim panel
2 Temperature setting
3 LED green (“line”)
4 LED red (“alarm”)
5 Reset button
6.1.1 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
– Visualisation of the operating status via LED
display:
– Voltage on, unit operational
– Door open (only if door limit switch installed)
– Warning of overtemperature
– High-pressure-operated switch has switched
– Switching hysteresis: 5 K
– Floating system message contact in case
of overtemperature
– Temperature setting
(setting range 30 – 55°C) via potentiometer
– Test function
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 perma-
nently circulate the internal enclosure air. The built-in
Basic controller ensures automatic normal shut-
down operation of the cooling unit by the value of the
fixed preset switching difference of 5 K.
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