TM 9-4120-388-14
5-12. CHARGING THE
REFRIGERATION SYSTEM.
INITIAL SETUP:
Materials/Parts Required
After the system has been satisfactorily evacuated, it must be fully charged with refrigerant-22 (item 8, Appendix E).
Never introduce liquid refrigerant into the low pressure (suction) service valve.
NOTE
The system must be evacuated before charging. Use only refrigerant-22 (item 8, Ap-
pendix E) to charge the unit.
Whenever available use recycled refrigerant for charging the refrigeration system.
Be sure that the hose from the low pressure service valve is connected to the compound gage side of the charg-
a.
ing manifold. The hose from the high pressure service valve should be connected to the pressure gage side
of the charging manifold.
b.
Connect the center hose from the charging mainifold to a well charged drum of refrigerant-22 (item 8, Appendix E).
Loosen the hose connections to the two air conditioner service valves slightly.
c.
d.
Open the two charging manifold valves.
e.
Open the refrigerant-22 drum valve slightly to allow a small amount of refrigerant to purge air from the hoses.
Tighten the hose connections at the air conditioner service valves.