TM 9-4120-407-14
b. Partial Charge.
Dangerous chemical refrigerant under pressure is used in the
operation of this equipment. Use great care to avoid contact with
liquid refrigerant.
Sudden and irreversible tissue damage can result from freezing.
Wear gloves and a face protector or safety glasses in any situation
where skin or eye contact with refrigerant is possible.
Heat causes the refrigerant to break down and form carbonyl
chloride (phosgene), a highly toxic and corrosive gas. Prevent
contact of refrigerant with flame or hot surfaces.
The system must be evacuated before charging. Moisture in the
system will prevent the Air Conditioner from operating properly.
NOTE
The charging operation should be done with all panels in place
except for refrigerant charging valve access cover.
(1) Connect the charge hose to a cylinder of Refrigerant R-22 set to deliver gas only.
(2) Loosen hose connections on the high and low pressure charging valves slightly.
(3) Check that vacuum and charge valves are closed.
(4) Open pressure gauge and compound gauge valves.
(5) Open refrigerant cylinder valve.
(6) Open charge valve slightly to allow a small amount of refrigerant to purge air from hoses.
Tighten hose connections on the discharge and suction service valves. Close charge valve.
Never introduce liquid refrigerant into the low pressure (suction)
charging valve. This can cause damage to the compressor.
(7) Close compound gauge valve.
(8) Connect power at power source.
(9) Turn air conditioner on and operate in COOL mode with potentiometer TEMPERATURE control set
at maximum COOL position.
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