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TM 9-4120-389-14
SECTION II MAINTENANCE PROCEDURES
5-2. REFRIGERATION SYSTEM REPAIRS GENERAL
The refrigeration system must be totally discharged before any maintenance action that requires opening of the
pressurized system. Leak testing and dehydrator replacement are required after any system component has
been removed and replaced. The system must be evacuated before it is charged. The system must be
properly charged to function properly.
WARNING
DANGEROUS CHEMICAL
(R22)
is used in this equipment
DEATH
or severe injury may result if personnel fail to observe safety precautions. Use great care to avoid contact with
liquid refrigerant gas being discharged under pressure. Sudden and irreversible tissue damage can result form
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 refrigerant to
break down and form carbonyl chloride (phosgene), a highly poisonous and corrosive gas.
WARNING
REFRIGERANT UNDER PRESSURE
is used in the operation of this equipment
DEATH
or severe injury may result if you fail to observe safety precautions. Never use a heating torch on any part that
contains refrigerant -22. Do not let liquid refrigerant touch you, and do not inhale refrigerant gas.
5-2
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