COMPRESSOR ELECTRICAL DIAGNOSTICS
The compressor does not start or will trip repeatedly on
overload.
Check Resistance (Ohm) Values
NOTE: Compressor windings can have very low ohm
values. Use a properly calibrated meter.
Perform the resistance test after the compressor cools. The
compressor dome should be cool enough to touch (below
120°F/49°C) to ensure that the overload is closed and the
resistance readings will be accurate.
Single Phase Compressors
1. Disconnect power from the machine and remove the
wires from the compressor terminals.
2. The resistance values between C and S and between C
and R, when added together should equal the
resistance value between S and R.
3. If the overload is open, there will be a resistance
reading between S and R, and open readings between
C and S and between C and R. Allow the compressor
to cool, then check the readings again.
Check Motor Windings to Ground
Check continuity between all three terminals and the
compressor shell or copper refrigeration line. Scrape metal
surface to get good contact. If continuity is present, the
compressor windings are grounded and the compressor
should be replaced.
To determine if the compressor is seized check the amp
draw while the compressor is trying to start.
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Summary of Contents for WU-0100A
Page 1: ...Undercounter Ice Machines Technician s Handbook Revision Date 1 24 22...
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Page 17: ...16 How to Read a Serial Number Full Serial Number...
Page 154: ...WU 0100 WIRING DIAGRAM Self Contained Air cooled 153...
Page 155: ...IC 0170 IU 0170 IC 0220 IU 0220 WIRING DIAGRAM Self Contained Air cooled 154...
Page 156: ...Printed Circuit Bards PCB WU 0100 PCB 155...
Page 161: ...SPACE FOR TECHNICIAN S NOTES...
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