Refrigerator Troubleshooting Diagram

Refrigerator Open Windings Compressor Testing

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Place a test probe on terminal one. With the other probe touch terminal two. The meter needle should deflect. This shows there is a circuit. Repeat the procedure until the circuitry between the terminals is confirmed. There should be a reading across each pair of terminals.

The windings in a three-phase compressor are different than a single-phase compressor. In the three-phase compressor, you should read the same amount of resistance through the three windings. This is not true in the single-phase compressors. The reason is that the start-winding has more wiring turns in order to develop more torque on start up. The run-winding has a heavier gauge wire with fewer turns, thus the resistance readings will be different between the three windings. Knowing this, it is possible to identify the windings in a single-phase compressor.

RUN—The lowest reading of resistance—(about one ohm)
START—The middle reading of resistance—(about five to 22 ohms)
COMMON—The maximum resistance reading—(total of all windings)

Written by sam

December 23rd, 2010 at 1:15 pm

One Response to 'Refrigerator Open Windings Compressor Testing'

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  1. One more class then I take my journeyman test in HVAC . Checking the windings in a single phase compressor we identify common first . common is the largest run is the smallest and start is second highest .

    mike murphy

    2 Mar 11 at 11:12 pm

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