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TM5-4120-387-14
Heating element is extremely hot. Severe burns can be caused
by touching with bare skin.
(3) Carefully feel lower part of compressor:
l If air conditioner has been connected to power supply for at least
four hours, compressor should feel warm (100 to 120°F).
If not
warm, test crankcase heater for continuity.
l
If air conditioner has not been connected to power supply for at
least four hours, compressor temperature should be the same as
surrounding air temperature.
(4) Using multimeter, test crankcase heater:
l Using multimeter, test resistance from pin F to pin G. Resistance
should be 264 to 396 ohms.
Lower reading indicates short, and
infinite reading indicates an open.
Replace faulty or open crank-
case heater.
(5) Using multimeter, test compressor motor wind
Check continuity between pins A, B, and C
No continuity should exist.
If continuity
bad.
l Test single phase windings at J3:
A t o B
B t o C
A t o C
rigs:
and the compressor body.
exists, the compressor is
All resistances should be above zero and less than 2 ohms.
Test resistance between pin D and pin E.
Resistance should be zero
indicating motor protector is closed.
l Compressor containing shorted, open or grounded winding or open
motor protector, should be replaced.
l
If compressor windings are bad, check for compressor burn out prior
to installing a new compressor.
(See instructions in compressor
removal.)
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