Version No. 1-2 - 28.04.2021
Doc. No. 9921970001
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11. Taking into Operation
Attention! The unit can be damaged by lack of lubricant. To ensure that the compressor is adequately
lubricated the oil, which has been displaced during transport, must be allowed to flow back into it. The unit must
therefore be allowed to stand for at least 30 min. before being connected to the mains and taken into operation.
Compressor based cooling units / system must be protected with a MCB Type D or K.
Upon connection the internal fan will start working. If the temperature inside the enclosure is higher than the
set value of the controller both the compressor and external air fan start working. Once the air inside the
enclosure reaches the set temperature the compressor and external fan will stop. The unit is pre-set at 35°C,
which is suitable for most of the electronic devices.
12. Trouble Shooting
Failure
Condition
Cause
Solution
Unit does not
cool
Internal fan does not work
Power not connected.
Verify power supply
Internal fan works, external
fan and compressor don't
work
Enclosure temperature is below
setting temperature (St)
Verify values of parameter "St"
Door switch contact is open
Verify door switch
Controller doesn't work
Replace controller
Internal fan works, external
fan and compressor don't
work Display shows
alternating "OFF" and
temperature
The sequence of the phases inside the
power supply connector is incorrect
Change phases inside power supply
connector
Unit does not
cool
External and internal
fan work, compressor
does not work
Compressor motor electrical failure
Verify external fan, verify ambient
temperature, clean condenser
Capacitor for compressor failed
Replace capacitor
Compressor works, external
fan doesn't work
External fan needs to be replaced
Replace external fan
Enclosure
over
heating
Compressor and
fans (external and
internal) work all the time
Unit cooling undersized
Enclosure needs a bigger cooling
unit
Enclosure needs a
bigger cooling unit
Thermal compressor protector
triggered
Verify ambient temperature, clean
condenser
Refrigerant leakage
Contact dealer/service center
Excessive
condensate
Door enclosure open
Ambient air gets into the enclosure
Ensure door is closed, add a door
switch and connect it to controller
Door enclosure closed
Enclosure IP degree minimum IP54
Seal openings on enclosure
Damaged misplaced sealing strip
Repair strip accordingly
13. Maintenance & Cleaning
Always switch power supply off before starting any maintenance on the unit.
The cooling unit is generally maintenance free and can be operated without filters in most environments. For
units with filters these should be checked, cleaned and if necessary replaced on a regular basis. In addition the
unit should have regular functional tests (approx. every 2,000 hours depending on the grade of ambient
pollution).
Disposal
The cooling unit contains R134a refrigerant and small quantities of lubricating oil. Replacement, repairs and
final disposal must be done according to the regulations of each country for these substances.
