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TM 5-4120-377-14
Section V TROUBLESHOOTING
4-16. GENERAL
a. This section contains troubleshooting information for locating and correcting most of the operating
troubles which may develop in the air conditioner unit. Each malfunction for an individual component, unit, or
system is followed by a list of tests or inspections which will help you to determine corrective actions to take.
You should perform the tests/insections and corrective actions in the order listed.
b. This Manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective
actions. If a malfunction is not listed, or is not corrected by listed corrective actions, notify your supervisor.
c. Table 4-2 lists the common malfunctions which you may find during the operation or maintenance of the
air conditioner unit or its components. You should perform the tests/inspections and corrective actions in the
order listed.
NOTE
Before you use this table, be sure you have performed all applicable operating checks.
HIGH VOLTAGE
is used in operation of this equipment.
DEATH ON CONTACT
may result if personnel fail to observe safety precautions.
Never work on electrical equipment unless there is another person nearby who is familiar
with operation and hazards of equipment and who is competent in administering first aid.
When technician is aided by operators, he must warn them about dangerous areas.
Whenever possible, input power supply to equipment must be shut off before beginning work.
Take particular care to ground every capacitor likely to hold a dangerous charge. When
working inside, after power has been turned off, always ground every part before touching it.
Be careful not to contact high-voltage connections of 203 volts ac input when installing or
operating this equipment.
Whenever nature of opration permits, keep one hand away from equipment to reduce hazard
of current flowing through vital organs of body.
Do not operate equipment without all grilles, guards, louvers, and covers in place and tightly
secured.
Warning: Do not be misled by term “low voltage.” Potentials as low as 50 volts may
cause death under adverse conditions.
4-39
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