TM 9-4120-402-14
5-17. CHARGING THE REFRIGERANT SYSTEM. - continued
b.
Partial Charge.
WARNING
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.
CAUTION
Use only Refrigerant-22 to charge the unit.
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-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.
CAUTION
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.
5-51
