|
|
HA-70 < PRECAUTION > [WITHOUT HEAT PUMP SYSTEM] PRECAUTIONS SERVICE COUPLERS Never attempt to connect HFC-134a (R-134a) service couplers to the CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers do not properly connect to the CFC-12 (R-12) system. However, if an improper connection is attempted, discharging and contamination may occur. REFRIGERANT WEIGHT SCALE Verify that no refrigerant other than HFC-134a (R-134a) and speci- fied lubricants have been used with the scale. The hose fitting must be 1/2 ″-16 ACME if the scale controls refrigerant flow electronically. CALIBRATING ACR4 WEIGHT SCALE Calibrate the scale each three month. To calibrate the weight scale on the ACR4: of the weight scale. 6. Enter the known weight using four digits. (Example 10 lb. = 10.00, 10.5 lb. = 10.50) CHARGING CYLINDER Using a charging cylinder is not recommended. Refrigerant may be vented into 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 |