ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
5 15. CHARGING REFRIGERANT SYSTEM. Continued
SERVICE - Continued
Never introduce liquid refrigerant into the low pressure (suction' service) valve
Compressor damage may result The system must be evacuated before charging Use
only R-22 refrigerant to charge unit.
The system must be evacuated before charging. Whenever available, use recycled
refrigerant for charging the refrigeration system.
Check that 1/4-inch (0.64 cm) yellow hose is connected to R-22 refrigerant cylinder
Position R-22 refrigerant cylinder so that liquid will be dispensed.
Place cylinder on accurate scale, measure and record weight of cylinder.
Open CV, VPV, and CGV Allow liquid refrigerant to enter system until the cylinder weight has decreased by 12
pounds (9.99 kg) or until system pressure has equalized with cylinder pressure g Close PGV.
Figure 5-7. Charging Refrigerant System