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1.3. Checking for Leakage to Frame
For checking whether there is leakage between the live parts
and the frame, the insulation resistance can be tested using an
ohmmeter, megger or high-voltage testing device.
An ohmmeter can be used for a rough check.
When investigating the wires on the unit, a clamp from the
ohmmeter is placed on the unit earth terminal.
Investigate the compressor for leakage to the frame by placing
the clamp from the ohmmeter on the joint connection and on
the compressor earth terminal. The ohmmeter will now show if
there is any leakage to the frame.
Flammable Refrigerant
When checking compressors for flammable refrigerants using
a megger or a high-voltage testing device, make sure that the
compressor is completely emptied of refrigerant, as sparks
may be formed during the check.
1.4. Compressor Failure
Check whether voltage is being supplied to the unit.
PTC starting device with LST.
Connect a voltmeter between terminals neutral and L on the
starting device.
If no voltage can be measured, either the mains cable or the
socket is defective.
Connect a voltmeter between terminals neutral and C on the
starting device.
If no voltage can be measured, a defective thermostat or ther-
mostat wiring is indicated.
Neutral terminal = N on starting device 1 03N001 1 + 1 03N0021
Neutral terminal = M on starting device 103N0012
Dismount the red and brown wires on the thermostat and short-
circuit them. If the compressor runs now, the thermostat is
defective. If the compressor does not run, a break in the
thermostat wiring is indicated.
If there is voltage between terminals neutral and C on the
starting device, a defect in the starting device, compressor or
refrigerating system is indicated.
PTC starting device
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10.