ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
5.14. EVACUATING REFRIGERANT SYSTEM. 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; end
Death or serious injury may result if personnel fail 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
Do not evacuate a leaking system. The vacuum created can cause air, moisture, and
dirt to enter system.