TM 9-4120-403-14
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 Open the high pressure charging valve on the air conditioner. Allow liquid refrigerant to enter the system until
the drum weight has decreased by 2.3 pounds (1.05kg) or until system pressure has equalized.
k Close the refrigerant drum valve and the high pressure (discharge) manifold valve.
l Connect airconditioner to a remote control module assembly.
m Connect power.
n Press and release both pressure switch reset buttons.
o Turn airconditioner on and operate in the COOL mode with the TEMPerature control thermostat set at a
maximum DECREASE position and fan speed set to HI SPEED.
p If the2.3 pound (1.05 kg) full charge was obtained, skip steps q thru s. If the system pressure equalized prior to
obtaining a full charge of 2.3 pounds (1.05kg), proceed with step q.
q Switch the refrigerant drum to the gas only position.
r Be sure that the refrigerant drum had been switched to the gas position and open the refrigerant drum valve, the
low (suction) pressure charging manifold valve, and the low (suction) pressure charging valve on the air conditioner.
s Monitor the weight of the refrigerant drum as the air conditioner compressor pulls additional refrigerant gas into
the system until the full 2. 3 pound (1. 05 kg) charge is obtained. When the system is fully charged, immediately close
the air conditioner low pressure charging valve and the refrigerant drum valve.
t Run the air conditioner in COOL mode (with TEMPerature control thermostat in full DECREASE position and fan
speed set at LO SPEED) for 15 minutes.
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