5-18. CHARGING THE REFRIGERANT SYSTEM. - continued
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.
Use only refrigerant R-22 to charge the unit.
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.
Loosen hose connections on the HIGH and LOW PRESSURE CHARGING VALVES slightly.
(3) Check that vacuum and charge valves are closed.
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 HIGH and LOW PRESSURE CHARGING VALVES. Close charge valve.
Never introduce liquid refrigerant into the low pressure (suction) charging valve.
(7) Close compound gauge valve.
Use suitable disconnect to isolate power source when connecting input power
cable. Do not connect power cable to unit or power source if voltage is present.
(8) Connect power at power source.