Version No. 1-4 - 31.07.2022
Doc. No. 9943253001
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15. 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. The unit / 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 hysteresis is 3K, the minimum ON-time is 4 minutes, the minimum OFF-time is 3 minutes, for units with a
cooling capacity of more than 1 kW is it usually 7 minutes.
The unit is pre-set at 35°C, which is suitable for most of the electronic devices.
16. Trouble Shooting
Failure
Condition
Cause
Solution
Unit
doesn't
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 (St1)
Verify values of parameter "St1"
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
doesn't
cool
External and internal fan work,
compressor does not work
Compressor motor electrical
failure
Have compressor replaced
by qualified service technician
Capacitor for compressor failed Replace capacitor
Compressor works, external fan
doesn't work
External fan needs to be
replaced
Replace external fan
Enclosure
temperature
too hot
Compressor and fans (external
and internal) work all the time
Cooling unit undersized
Enclosure needs a cooling unit with higher capacity
Compressor and external fan
work in alternating mode
(ON / OFF)
Thermal compressor protector
triggered
Verify if ambient temperature is too high, clean condenser
Refrigerant leakage
Contact dealer / service centre
Excessive
condensate
Enclosure door open
Ambient air gets into the
enclosure
Ensure door is closed, add a door switch and connect
it to controller
Enclosure door closed
Enclosure IP protection class
is below IP54
Seal all openings of the enclosure
Damaged or misplaced sealing
strip
Repair sealing strip accordingly
17. 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 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.
