32 RITTAL cooling unit assembly and operating instructions
7 Inspection and maintenance
EN
6.2.9 Resetting the Comfort controller
After the occurrence of faults A03, A06 and A07,
you will need to reset the Comfort controller.
• Press buttons 1 (
▲
)
and 3 (
▼
) (Fig. 38) simul-
taneously for 5 sec.
The system messages will disappear and the tem-
perature display will be shown.
7 Inspection and maintenance
7.1 General
The cooling circuit is designed in the form of a main-
tenance-free, hermetically sealed system. The cool-
ing unit is filled with the required quantity of refriger-
ant at the factory, checked for leaks, and subjected
to a functional test run.
The installed maintenance-free fans are mounted on
ball bearings, protected against moisture and dust,
and fitted with a temperature monitor. The life expec-
tancy is at least 30,000 operating hours. The cooling
unit is thus largely maintenance-free. All that may be
required from time to time is to clean the components
of the external air circuit using a vacuum cleaner or
compressed air if they become visibly dirty. Any
stubborn, oily stains may be removed using a non-
flammable detergent, such as degreaser.
Maintenance interval: 2000 operating hours. Depen-
ding on the level of contamination in the ambient air,
the maintenance interval may be reduced to suit the
air pollution intensity.
Sequence of maintenance measures:
– Check the level of dirt.
– Filter soiling? Replace the filter if necessary.
– Cooling membranes soiled? Clean if necessary.
– Activate test mode; cooling function OK?
– Check noise generation of compressor and fans.
7.1.1 Compressed air cleaning
SK 3304.xxx, SK 3305.xxx
Fig. 41: Disconnect the power cord
Fig. 42: Remove the upper louvred grille
Risk of electric shock!
The unit is live.
Switch off the power supply before open-
ing, and take suitable precautions
against
it being accidentally switched back on.
Caution!
Risk of fire!
Never use flammabel liquids
for cleaning.
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