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Page Title:
TEST AND INSPECTION - continued |
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 TM9-4120-423-14&P
2
Electrically test the heater element, heater thermostat, wiring harness and motor as follows.
3
Disconnect wiring harness at connectors P10 and J10 (located on the compressor junction box).
WARNING
Allow compressor to cool before touching. Severe burns can result from touching hot
compressor.
4
Carefully feel lower part of compressor.
5
If air conditioner has been connected to power supply for at least four hours, compressor should
feel warm (100-120Ε F). If not warm, test crankcase heater for continuity.
6
If air conditioner has not been connected to power supply for at least four hours, compressor
should be at ambient temperature.
7
Using multimeter, test crankcase heater, and thermostat circuit at J10 connector.
8
Using multimeter, test resistance from pin F to pin G. Resistance should be 950 to 1430 ohms.
Lower reading indicates short, and infinite reading indicates an open.
9
Using multimeter, test crankcase heater, and thermostat at junction box.
10
Remove compressor junction box cover.
11
Open connection between thermostat lead and heater lead.
12
Check heater continuity between open connection and J10-F. If open, heater should be replaced.
13
Check thermostat continuity between open connection and J10-G. If open, thermostat should be
replaced.
14
Using multimeter, test compressor motor windings.
15
Check continuity between pins A, B, and C and the compressor body. No continuity should
exist. If continuity exists, the compressor is bad.
16
Test 3 phase windings at J10: A to B, B to C, A to C.
17
All resistances should be above zero and less than 2 ohms.
18
Test resistance between pin D and pin E. Resistance should be zero indicating thermostatic
switch is closed.
0097 00-6
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