Figure 5-5. Refrigerant Charging
The system must be evacuated before charging. Use only Refrigerant-22 to charge
the unit. If available, use recycled refrigerant.
a. The charging operation should be done with all panels in place except for the refrigerant charging valve access
b. Check that the hose from the low pressure charging valve is connected to the compound gage side of the
charging manifold. The hose from the high pressure charging valve should be connected to the pressure gage side of
the charging manifold.
c. Connect the center hose from the charging manifold to a well charged drum of Refrigerant-22.
d. Loosen the hose connections to the two air conditioner charging valves slightly.
e. Open the two charging manifold valves.
f. Open the Refrigerant-22 tank 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.
g. Close the low pressure (suction) charging manifold valve. Never introduce Iiquid refrigerant into the low
pressure (suction) charging valve.
h. Position the Refrigerant-22 tank so that liquid will be used for charging. (Some drums must be inverted and
some are equipped with a selector valve.)
i. Using accurate scales measure and record the weight of the Refrigerant-22 drum.
j. Open the Refrigerant-22 drum valve.