TM 9-4120-401-14
SYMPTOM INDEX
Malfunction No.
Trouble
AIR CONDITIONER
Insufficient Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Noisy During Operation . . . . . . . . . . . . . . . . . . . . . . . . .
Operates Continuously On Cooling Cycle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
COMPRESSOR
Will Not Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REFRIGERANT SYSTEM
Sight Glass Appears Yellow lnstead of Green . . . . . . . . . . . . . . . . . . . . . .
Continuously Losing Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnect Power from the air conditioner before doing any maintenance work to
the electrical system. High voltage in air conditioner can kill.
Refigerant 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 R-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 thermal protective 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.
DIRECT SUPPORT TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
C O R R E C T I V E ACTION
Step 1. Check that the LOW and HIGH PRESSURE cutout switches are not tripped.
Press and release the HIGH PRESSURE cutout switch to RESET. If compressor still does