TM 9-4120-402-14
Section II DIRECT SUPPORT TROUBLESHOOTING
5-2. USE OF TROUBLESHOOTING TABLE.
a. The troubleshooting table (table 5-1) lists the most common malfunctions which you may find during the operation
or maintenance of the air conditioner. You should perform the tests/inspections and corrective actions in the order listed.
b. For a specific malfunction, perform the troubleshooting procedures listed in table 4-3 before performing the
c. This manual cannot list all malfunctions which may occur. However, all tests or inspections and corrective actions
are listed for most common malfunctions.
d. If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
WARNING
Disconnect power from the air conditioner before doing any maintenance work to the electrical
system. High voltage in air conditioner can kill.
Refrigerant under pressure is used in the operation of this equipment.
Death or severe injury may result if personnel fail to observe safety precautions.
Never use a heating torch on any part that contains refrigerant 22.
Avoid bodily contact with liquid refrigerant and avoid inhaling refrigerant gas.
Use great care to avoid contact with liquid refrigerant or refrigerant gas being discharged from any
container under pressure. Sudden and irreversible tissue damage can result from freezing. Wear gloves
and a face protector or safety glasses in any situation where skin or eye contact is possible.
Prevent contact of refrigerant gas with flame or hot metal surfaces. Heat causes the refrigerant to break
down and form carbonyl chloride (phosgene), a highly toxic and corrosive gas.
Never pressurize lines with oxygen, mixture with oil will cause an explosion.
5-3