TM 9-4120-385-14
1.
Disconnect power supply.
2.
Loosen two panel fasteners and remove lower panel.
3.
Loosen four captive screws and remove junction box with control panel.
4.
Remove two screws and access cover.
WARNING
Make sure compressor and heater are cool before touching. Severe
burns can result from touching while hot.
Visually inspect compressor for damage or defecta in the crankcase heater,
5.
thermostat, and terminal box.
Check the compressor hermetic seal (welded cover) for damage or leaks.
6.
Check mounting hardware for security.
7.
Check electrical connection for security.
8.
e. TESTING.
To Test for Compressor Motor Burnout.
1.
WARNING
High voltage can kill.
(a) Check for proper voltage, 115 V, 50/60 Hz.
(b) Disconnect power supply.
(c) Check for for malfunction of the compressor relay K1. Replace if defective. Refer
(d) Disconnect compressor power supply at J3/P3.
(e) Check the compressor internal thermostat switch by checking the continuity
between pins D and E of J3. If continuity is not indicated, switch is open. Compressor motor
may be burned out.
(f) Using a multimeter, check continuity of J3 from pins A to B, B to C, A to C.
If continuity is not indicated, compressor motor maybe burned out. See Figure 5-12.
5-40
