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05.06.2015
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Copyright
2013 by: WATERKOTTE GmbH. Subject to changes.
Insulation resistance
After installation or after unit has been cut off from power supply for an ex-
tended period, the insulation resistance will drop below 1 MΩ due to refrig-
erant accumulating in the compressor. This is not a malfunction. Proceed
as follows:
1.
Remove wires from compressor and measure insulation resistance
of compressor.
2.
If insulation resistance is below 1 MΩ, the compressor is faulty or
the resistance dropped due to refrigerant accumulation in com-
pressor.
3.
After wires are connected and power is switched on, compressor
starts to warm up. Remeasure insulation resistance based on acti-
vation times indicated below.
The insulation resistance drops due to refrigerant accumulation in
the compressor. Resistance will rise above 1 MΩ after compressor
has warmed up for 4 hours.
(The required compressor warm-up time varies according to at-
mospheric conditions and refrigerant accumulation.)
To operate the compressor with refrigerant accumulation, it must
be warmed up at least 12 hours to prevent failure.
4.
If insulation resistance rises above 1 MΩ, the compressor is not
faulty.
Compressor will not operate unless the power supply phase connection is
correct.
