Equator 375 service manual Checking for Leakage to Frame, Compressor Failure

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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