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HA-8 < PRECAUTION > PRECAUTIONS Do not attempt to connect HFC-134a (R-134a) service couplers to a CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers do not properly connect to a CFC-12 (R-12) system. However, if an improper connection is attempted, refrigerant discharging and con- tamination may occur. REFRIGERANT WEIGHT SCALE Verify that no refrigerant other than HFC-134a (R-134a) and speci- fied oils have been used with the scale. The hose fitting must be 1/ 2 ″-16 ACME if the scale controls refrigerant flow electronically. CHARGING CYLINDER Using a charging cylinder is not recommended. Refrigerant may be vented into the air from cylinder’s top valve when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an electronic scale or of quality recycle/recharge equipment. Shut-off valve rotation A/C service valve Clockwise Open Counterclockwise Close RHA273D RHA274D |