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TM5-4120-377-14
5-5. 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 removal and replaced. The system must be evacuated before it is charged. The system must be
properly charged to function properly.
DANGEROUS CHEMICAL
(R22)
is used in this equipment.
DEATH
or severe damage 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 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
refrigerant to break down and from carbonyl chloride (phosgene), a highly poisonous and
corrosive gas.
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.
5-6
DISCHARGING THE REFRIGERANT SYSTEM
a. Using screwdriver, remove four screws and flat washers from service valve access cover.
Figure 5-2.
Access (Service
b. Remove service valve access cover.
c. Unscrew hose connection protective caps.
Valves) Cover
Change 1
5 - 7
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