5-10. CHARGING REFRIGERATION SYSTEM-Continued.
Connect the hose from the low pressure service valve to the compound gage side of the charging manifold.
Connect the hose from the high pressure service valve to the pressure gage side of the charging manifold.
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.
Open the two charging manifold valves.
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.
Close the low pressure (suction) charging manifold valve.
Position the refngerant-22 drum so that liquid will be used for charging. (Some drums must be Inverted and
some are equipped with a selector valve.)
Using accurate scales, measure and record the weight of the refrigerant-22 drum.
Open the refrigerant-22 drum valve.
Open charging valve. Allow liquid refrigerant to enter the system until cylinder weight has decreased by
of required charge, or until system pressure equalizes.
Close pressure gage valve.
if the system took the required charge, proceed to step "q." If the system pressure
equalized continue with step "n".
Position refrigerant cylinder so that gas only will be dispensed.
HIGH VOLTAGE is used in the operation of this equipment. DEATH ON CONTACT
or severe injury may result if personnel fail to observe safety precautions.
Connect power and turn unit on. Adjust thermostat so compressor is operating.
Open compound gage valve. Monitor the weight of the refrigerant cylinder as the unit compressor draws
additional refrigerant into the system. Close compound gage valve when the complete charge weight has been
Close all manifold valves, cylinder valve, and high and low pressure service valves.
Remove service manifold hoses from service valves and refrigerant cylinder and attach them to hose rack.
Replace valve stem and hose connection protective caps on service valves. Tighten securely.
Turn system off.
Replace both front door assemblies. See para 4-17.