Version No. 1-1 - 04.05.2021
Doc. No. 994274002
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12. 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. after mounting
before being connected to the mains and taken into operation.
The unit / system must be protected with a MCB Type D or K.
The unit is controlled in relation to the cabinet internal temperature. A temperature sensor continuously
measures the temperature of the air which is drawn into the unit from the cabinet. The required cabinet temp.
can be set on the cabinet temperature potentiometer on the PC-board. The temperature adjustment range is
between 20°C (left-hand stop) and 50°C (right-hand stop). The potentiometer is factory pre-set at 35°C.
To adjust the cabinet internal temperature please proceed as follows:
Remove the fixing screws from the unit cover and the earth wire from inside it.
Lift off the cover.
Remove the PCB cover.
Using a screwdriver turn the cabinet temperature potentiometer on the PC-board slightly to the right
(higher) or to the left (lower)
Close the unit in the prescribed manner.
Check that the new adjusted values meet the necessary requirements. If necessary repeat the procedure. The
compressor together with the ambient radial fan are switched ON or OFF, depending on the cabinet internal air
temperature. Here the minimum shut-down time corresponds with the start-up delay. The cooling mode will
switch on as soon the desired temperature is reached. The start-up delay is depending on the unit size 3 or 7
min. The cooling mode will switch off as soon as the desired temperature is undercut by 3K (hysteresis) (KG
4266854 has a 5K hysteresis) and / or when the max. running time of 3 min. is reached.
When the test button is pressed the compressor and the ambient fan will run for 120-240 sec. regardless of the
cabinet temperature. During this period the green LED on the PC-board will blink twice as fast as normal. If the
test button is pressed during the 120-240 sec. test-run, the unit will return to its normal operational mode. The
test-run should only be repeated after a minimum compressor shut-down time of 10 min.
NOTE: When the unit is taken into operation for the first time, a start-up delay of the cooling circuit for ca. 4-7
min. independent of temperature setting and actual cabinet temperature will take place.
