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TM 9-4120-389-14
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 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 8.5 pounds (3.9 kg)
or until system pressure has equalized.
k. Close the refrigerant drum valve and the high pressure (discharge) manifold valve.
l. Connect power.
m. Be sure circuit breakers are on.
n. Press and release both pressure switch reset buttons.
o. Turn air conditioner on and operate in the COOL mode with the temperature control thermostat set at
a maximum DECREASE position.
p. If the 8.5 pounds(3.9 kg) full charge was obtained, skip steps q thru s. If I the system pressure
equalized prior to obtaining a full charge of 8.5 pounds (3.9 kg), proceed with step q.
q. Switch the refrigerant drum to the gas only position.
r. Be sure that the refrigerant drum has been switched to the gas position and open the refrigerant drum
valve and the low (suction) pressure charging manifold valve.
s. Monitor the weight of the refrigerant drum as the air conditioner compressor pulls additional refrigerant
gas into the system until the full '8.5 pound (3.9 kg) m charge is obtained. When the system is fully charged,
immediately close the refrigerant drum valve.
t. Run the air conditioner in COOL mode (with temperature control thermostat in full COOLER position)
for 15 minutes.
Change 1 5-15
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