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TM 5-4120-376-14
5-13. CHARGING THE SYSTEM.
WARNING
Avoid contact with refrigerant acid. Burns could result from contact with refrigerant.
CAUTION
Do not attempt to charge liquid refrigerant into the suction line. The compressor would be
damaged.
CAUTION
If knocking or pounding is heard when starting the air conditioner, shut down at once and
release some refrigerant before attempting another start.
NOTE
Two kinds of refrigerant cylinders are used in general. One is equipped with a single
shutoff valve, and must be inverted when charging liquid refrigerant. The other is
equipped with a vapor valve and a liquid valve, which makes it possible to charge with
either liquid or vapor when the cylinder is upright.
Whenever available, usc recycled refrigerant for charging the refrigeration system.
a. When charging the system use a manifold gauge set similar to that shown below. Connect a manifold gauge
and a cylinder of refrigerant R-22 (Table D-1, Item 11 ) loosely to the service valves and open the cylinder shutoff
valve for a few seconds to purge the line of air. Tighten the service valves connection.
Change 5
5-15
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