TM 9-4120-398-14
5-10. CHARGING THE REFRIGERATION SYSTEM (cont)
c. Loosen the hose connections to the two air conditioner charging valves slightly.
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 charging valves.
f. Close the low pressure (suction) charging manifold valve. Never introduce liquid refrigerant into the low pressure
(suction) charging valve.
g. Position the refrigerant 22 drum so that the liquid will be used for charging. (Some drums must be inverted and some
are equipped with a selector valve).
h. Using accurate scales, measure and record the weight of the refrigerant 22 drum.
i. Open the refrigerant -22 drum valve.
j. AllOW liquid refrigerant to enter the system until the drum weight has decreased by 11.0 pounds (5.0 kg) or until
system pressure has equalized.
k. Close the refrigerant drum valve and the high pressure (discharge) manifold valve.
