Assessments - 4, GPA: 4.3
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To disconnect the gauge set from service valves: E Quickly disconnect the charging hoses from the service valves. E Always disconnect the low side while the engine is running. I Disconnect the high side with the engine OFF and after the pressure has stabilized. Manifold gauge interpretation takes some practice and must be completed with consideration of the other symptoms and potential problems that have been identified in the system. Precautions E Wear protective clothing and eyewear, do not allow skin to come in direct contact with refrigerant. E Do not store or allow refrigerant containers to exceed 52 degrees C. (126 degrees F.) I Do not use refrigerant in confined spaces with poor ventilation. I Do not use R-12 refrigerant in the presence of an open flame. I Do not steam clean system. I Do not drop refrigerant containers or otherwise cause the container to rupture. . Follow proper procedure while connecting/ disconnecting hoses of manifold gauges, vacuum pump, oil separator, and charging systems. N Open and close manifold gauge valves carefully. O Exercise caution while working around drive belts, pulleys, and other moving components of an operating air conditioning system. O Ensure the proper level and type of compressor oil in system. Note: Do not introduce compressed air into R-134a components. Subaru Air Conditioning Systems 8 Vacuum of System mm Hg, in Hg 710 27.95 685 26.97 660 25.98 635 25.00 Evacuating The System Elevation/Pressure Relationship Vacuum of System mm Hg, in Hg 710 27.95 685 26.97 660 25.98 635 25.00 Evacuating The System Elevation/Pressure Relationship General Preparations Always conduct a visual inspection of the air conditioning system to identify any damage, excessive wear, refrigerant leaks (oil residue), improper belt adjust- ment, improper pulley alignment, and plugged condenser cooling fins. Note: Never use water to clean the condenser or radiator fins. Using compressed air is the approved method. Observe the refrigerant flow through the receiver/dryer sight glass (if equipped), use the correct gauges to check all systems, verify all system compo- nents and controls are operable, check for loose fittings, replace defective, worn, or damaged drive belts, and repair system leaks. Note: The use of the sight glass alone to determine system charge level can be misleading. Normally operating and correctly charged variable displacement compressors and R-134a systems will have bubbles showing in the sight glass under certain conditions. Discharging Caution: Refrigerant R-12 has been identified as a compound which causes damage to the ozone layer. It is unlawful to discharge R-12 into the atmosphere. Subaru of America encourages you to handle R-12 in a responsible and safe manner, and according to Federal EPA guidelines and any local and state regulations. Always follow approved recovery/recycling procedures and utilize approved recovery/recycling equipment. Discharging and recovery of the system refrigerant is required before replacement of major components of the system. It is also required when the system has a leak, or for the replacement of refrigerant oil. Discharging and recovery of the system refrigerant is the first step in preparing for major servicing, repair, or replacement of components; the second step is evacuation. Evacuating Evacuating the system removes air and moisture from the system. Discharge and recover the system refrigerant first; then follow the steps listed below to evacuate the system: • Fully close both valves of the manifold gauge set. • Connect a vacuum pump to the center charging hose of the manifold gauge set. • Start the vacuum pump. • Open the low- and high pressure valves slowly. • When the pressure reading has reached approximately 29.00 in Hg, fully close both valves. • Stop the vacuum pump. • Wait 10 minutes, the pressure reading should not change. If it changes, there is a leak in the system. Note: Certain types of system leaks such as loose fittings may not be discovered using this method. Always recheck the system with a leak detector after the system is charged. Elevation m (ft) 0 (0) 300 (1,000) 600 (2,000) 900 (3,000) Note: Values show readings of the low-pressure gauge. 9 Subaru Air Conditioning Systems Charging Charging the system is required after servicing, repair or replacement of system components, or to locate a leak when there is no refrigerant in the system. Follow the steps listed below to charge the system: • Leak detection of a pressurized system is required to locate an otherwise unidentifiable leak in a discharged system or when the system was dicharged/evacuated for repairs. • The proper procedure is to: -Connect the manifold gauges or ACR-4 to the system. -Attach the center charging hose to the refrigerant source. -Charge the system initially with .5 -.75 lbs (0.226-0.34 kg). Note: Refer to the appropriate model year Subaru Service Manual or air conditioning manufacturer’s instructions for charging details, pressures, and ...
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