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HA-10 < PRECAUTION > [WITH HEAT PUMP SYSTEM] PRECAUTIONS • If a fluorescent indicator enters the refrigerant cycle, either wash the refrigerant cycle parts or replace the parts. Service Equipment INFOID:0000000010122085 RECOVERY/RECYCLING RECHARGING EQUIPMENT Be certain to follow the manufacturer’s instructions for machine operation and machine maintenance. Never introduce any refrigerant other than that specified into the machine. VACUUM PUMP The lubricant contained inside the vacuum pump is not compatible with the specified lubricant for HFC-134a (R-134a) A/C systems. The vent side of the vacuum pump is exposed to atmospheric pres- sure. So the vacuum pump lubricant may migrate out of the pump into the service hose. This is possible when the pump is switched OFF after evacuation (vacuuming) and hose is connected to it. To prevent this migration, use a instruction valve placed near the hose- to-pump connection, as per the following. • Vacuum pumps usually have a instruction isolator valve as part of the pump. Close this valve to isolate the service hose from the pump. • Use a hose equipped with a instruction shut-off valve near the pump end for pumps without an isolator. Close the valve to isolate the hose from the pump. • Disconnect the hose from the pump if the hose has an automatic shut-off valve. As long as the hose is connected, the valve is open and lubricating oil may migrate. Some one-way valves open when vacuum is applied and close under no vacuum condition. Such valves may restrict the pump’s ability to pull a deep vacuum and are not recommended. MANIFOLD GAUGE SET Be certain that the gauge face indicates HFC-134a or R-134a. Be sure the gauge set has 1/2 ″-16 ACME threaded connections for ser- vice hoses. Confirm the set has been used only with refrigerant HFC-134a (R-134a) and specified lubricants. SERVICE HOSES Be certain that the service hoses display the markings described (colored hose with black stripe). All hoses must equip positive shut- off devices (either instruction or automatic) near the end of the hoses opposite to the manifold gauge. SERVICE COUPLERS RHA270DA SHA533D RHA272D |