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TM 9-4120-389-14
CAUTION
Do not skip the next step.
u. After 15 minutes, observe the sight glass on back of condenser section. Green center means the
refrigerant moisture content is acceptable. Yellow center means there is too much moisture in the system. It
must be discharged, evacuated, and charged again.
NOTE
Milky white or bubbly liquid means the system has a low charge. Clear bubble-free liquid around the center
means the system is fully charged.
v. If charge is low, add gas refrigerant.
(1) Be sure that drum is switched to gas position. Open the drum valve.
(2) Continue to charge until sight glass is clear and bubble-free.
(3) Close the refrigerant drum valve.
w. Check air conditioner for proper cooling. There should be at least a 15 deg. F temperature difference
between evaporator discharge air and the inlet air. Turn the mode selector switch to OFF.
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.
x. Remove the charging manifold hoses from the air conditioner charging valves.
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