TM 9-4120-398-14
The refrigeration system must be totally discharged
before any maintenance action that requires opening of the pressurized system. Leak testing and dehydrator replacementare
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.
Voltages used can kill. Always disconnect power cord to air conditioner before performing any internal
maintenance. Shutting unit off at its control panel does not disconnect unit power.
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 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 form 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.
NOTE
In accordance with Environmental Protection Agency regulations, refrigerants cannot be discharged into
the atmosphere. A refrigerant recovery and recycling unit must be used whenever discharging the
refrigerant system.
Operation of the recovery/cycling unit must be by AUTHORIZED PERSONNEL ONLY.
Whenever available, use recycled refrigerant for charging the refrigeration system.
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