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TM 9-4120-367-14
TM 075926-14/1
CHAPTER 4
TROUBLESHOOTING
4.1.1
This section contains troubleshooting information for locating and correcting moat of the operating troubles
which may develop in the air conditioner.
NOTE
This is a combined troubleshooting covering Unit, Direct and General Suppmt Maintenance. Refer to
the Maintenance Allocation Chart (MAC), Appendix B, for tasks authorized to your level of
maintanece.
4.1.2
Before using the troubleshooting guides, perform an operating check. Impossible, isolate the problem to either
equipment failure or control failure.
Disconnect power from the air conditioner before doing any maintenance work to
the electrical system. High voltage in air conditioner can kill you.
Never work on this equipment unless there is another person nearby who is familiar
with the operation and hazards of the equipment and who is competent in adminis-
tering first aid.
Be careful not to contact high voltage connections. Keep One hand away from the
equipment reduce the hazard of current flowing through vital organs of the body.
Do not be misled by the term ’’low voltage.” Potentials as low as 50 volts may cause
death under adverse conditions.
NOTE
At outside temperatures below 0°F (-18°C) LPCO will have to be jumped to
operate in COOL mode.
4-1
4.1 TROUBLESHOOTING.
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