ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
5.18. PURGING COMPRESSOR. This task covers service
Tool kit, service. refrigeration unit (Item 1, Appendix B)
Disconnect input power to the air conditioner before performing any internal
maintenance. Voltages used can KILL. Shutting the unit off at the control panel does
not disconnect unit power.
Disconnect air conditioner input power at source; and
Death or serious injury may result if personnel fall to observe safety precautions Use
great care to avoid contact with liquid refrigerant or refrigerant gas being discharged
under pressure. Sudden and irreversible tissue damage can result from freezing. Wear
thermal protective gloves and a face protector or goggles in any situation where skin-
eye-contact is possible.
Prevent contact of refrigerant gas with flame or hot surfaces. Heat causes the
refrigerant to break down and form carbonyl chloride (phosgene), a highly poisonous
and corrosive gas.
Remove discharge and suction gauge port caps.
Check that discharge and suction valves are frontseated (clockwise).
Connect service manifold low pressure hose (blue) to compressor suction valve gauge port,
Connect service manifold yellow 1/4-inch (0.64 cm) hose to R-22 refrigerant cylinder.
Open low side valve and let refrigerant flow out discharge valve port for 30 seconds.
Turn charging cylinder valve to reduce pressure of escaping refrigerant.
Replace discharge valve port cap while refrigerant is escaping