After the system has been satisfactorily evacuated. it must be fully charged with Refrigerant-22.
Never introduce liquid refrigerant into the low pressure (suction) service valve.
The system must be evacuated before charging. Use only Refrigerant-22 to charge
the unit. If available, use recycled refrigerant.
a. Check that the hose from the low pressure service valve is connected to the compound gage side of the charging
manifold. The hose from the high pressure service valve should be connected to the pressure gage side of the charging
b. Connect the center hose from the charging manifold to a well charged drum of Refrigerant-22.
Loosen the hose connections to the two air conditioner service 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 service valves.
f. Close the low pressure (suction) charging manifold valve. Never introduce liquid refrigerant into the low pressure
(suction) service 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.
Open the Refrigerant-22 drum valve.
j. Open the high pressure service valve on the air conditioner. Allow liquid refrigerant to enter the system until the
drum weight has decreased by 6 pounds (2.93 Kg) or until system pressure has equalized.
Close the refrigerant drum valve and the high pressure (discharge) manifold valve.
Connect air conditioner to a remote control module assembly.
m. Connect power.
n. Turn air conditioner on and operate in the COOL mode with the TEMPERATURE CONTROL set at the maximum
o. If the 6 pound (2.93 kg full charge was obtained, skip steps p through s. If the system pressure equalized prior to
obtaining a full charge of 6 pounds (2.93 kg) proceed with step p.
p. Switch the refrigerant drum to the gas only position.
q. Be sure that the refrigerant drum has been switched to the gas position and open the refrigeration drum valve, the
low (suction) pressure charging manifold valve and the low (suction) pressure service valve on the air conditioner.
r. Monitor the weight of the refrigerant drum as the air conditioner compressor pulls additional refrigerant gas into
the system until the full 6 pound (2.93 kg) charge is obtained. When the system is fully charged, immediately close the
refrigerant drum valve and the air conditioner low pressure service valve.
4-34 Change 4
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