Heating and Air Conditioning: Service Precautions
CAUTION:^ R-134A SERVICE EQUIPMENT OR VEHICLE A/C SYSTEMS SHOULD NOT BE PRESSURE TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR/R-134A HAVE BEEN SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DANGEROUS AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE. ADDITIONAL HEALTH AND SAFETY INFORMATION MAY BE OBTAINED FROM REFRIGERANT AND LUBRICANT MANUFACTURERS.
^ CARE SHOULD BE TAKEN TO PREVENT PERSONAL INJURY WHICH COULD OCCUR DUE TO TOUCHING A HOT ENGINE WHEN TESTING. TESTS SHOULD BE DONE WITH THE ENGINE OFF AND AS COOL AS POSSIBLE. DO NOT OPERATE THE DETECTOR IN A COMBUSTIBLE ATMOSPHERE SINCE ITS SENSOR OPERATES AT A HIGH TEMPERATURE.
^ DO NOT CONNECT ANY LINE TO THE HIGH-SIDE SERVICE FITTING DURING CHARGING PROCEDURE.
^ NEVER CHARGE THE A/C SYSTEM THROUGH THE HIGH PRESSURE SIDE OF THE SYSTEM. COMPONENT DAMAGE AND PERSONAL INJURY COULD RESULT
^ ALWAYS WEAR GOGGLES AND WRAP A CLEAN CLOTH AROUND FITTINGS, VALVES, AND CONNECTIONS WHEN PERFORMING WORK THAT INVOLVES OPENING THE REFRIGERANT SYSTEM.
^ ALSO, BEWARE OF THE DANGER OF CARBON MONOXIDE FUMES BY RUNNING THE ENGINE IN CLOSED OR IMPROPERLY VENTILATED GARAGES.