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Compressor Checks
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
Gain access to the Compressor See Unit Disassembly
1. Remove Compressor Cap.
2. Disconnect terminals U, V, and W from the Compressor).
Resistance Test.
1. Set Ohm meter to the lowest scale and check continuity
between pins U, V, and W.
At room temperature (70°- 95°F) the resistance should
be approximately 3.5 ohms. The Ohm values will change
significantly at different temperatures. This does not indicate
that the compressor windings are faulty. A reading of open
(infinity), or if resistance between the windings is not the same,
does indicate that the compressor windings are faulty.
2. Check for continuity from between pins U to ground, V to
ground, and U to ground.
The compressor windings are faulty if the there is continuity
from the compressor windings to ground.
Note:
•
Don't put a compressor on its side or turn over.
•
Assemble the compressor quickly after removing the
plugs. Prolonged exposure will damage the internal
components of the compressor
•
Ensure wiring is correct before operating. Reverse
operation will permanently damage the compressor.
50
COMPONENT TESTING
WARNING
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
Figure 502
Figure 503
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