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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. The cooling cycle will either stop once the air inside the
enclosure reaches the set temperature minus hysteresis or once the minimum On-time is reached. The setpoint
for the internal enclosure temperature is pre-set at 95°F.
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.
Failure
Condition
Internal fan does not work
Internal fan works, external fan
Unit
and compressor don't work
doesn't
cool
Internal fan works, external fan
and compressor don't work.
Display shows alternating OFF
and temperature
External and internal fan work,
Unit
compressor does not work
doesn't
cool
Compressor works, external fan
doesn't work
Compressor and fans (external
and internal) work all the time
Enclosure
temperature
Compressor and external fan
too hot
work in alternating mode
(ON / OFF)
Enclosure door open
Excessive
condensate
Enclosure door closed
Version Nr. 1-12 - 28.02.2022
13. Taking into operation
14. Trouble shooting
Cause
Power not connected.
Enclosure temperature is below
setting temperature (St)
Door switch contact is open
Controller doesn't work
The sequence of the phases
inside the power supply
connector is incorrect
Compressor motor electrical
failure
Capacitor for compressor failed Replace capacitor
External fan needs to be
replaced
Cooling unit undersized
Thermal compressor protector
triggered
Refrigerant leakage
Ambient air gets into the
enclosure
Enclosure IP protection class
is below IP54
Damaged or misplaced sealing
strip
Doc. No. 99872500201USL
Solution
Verify power supply
Verify values of parameter
"St"
Verify door switch
Replace controller
Change phases inside power
supply connector
Have compressor replaced
by qualified service technician
Replace external fan
Enclosure needs a cooling
unit with with higher capacity
Verify if ambient temperature
is too high,clean condenser
Contact dealer/service center
Ensure door is closed, add
a door switch and connect
it to controller
Seal all openings of the
enclosure
Repair sealing strip
accordingly
17 / 20
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