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System Evacuation

CAUTION:
  • Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat.
  • Be careful when connecting service equipment.
  • Do not breathe refrigerant or vapor.
NOTE:
  • If accidental system discharge occurs, ventilate the work area before resuming service.
  • Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.
  • Do not allow moisture to contaminate the A/C system oil. Moisture in the oil is difficult to remove, and it can damage the A/C compressor.
  1. When an A/C System has been opened to the atmosphere, such as during installation or repair, it must be evacuated using an R-134a refrigerant recovery/recycling/charging station. If the system has been open for several days, replace the receiver/dryer, drain the refrigerant oil, and add fresh oil (see A/C REFRIGERANT OIL REPLACEMENT  ). then evacuate the system for several hours before charging it.
  2. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown in illustration, following the equipment manufacturer's instructions.
    Fig 1: Identifying Refrigerant Recovery/Recycling/Charging Station With High And Low Pressure Service Port
    G08090346Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. If the suction gauge does not reach approximately -93.3 kPa (-700 mmHg,-27.55 inHg) in 15 minutes, there is probably a leak in the system. Partially charge the system, and check for leaks (see REFRIGERANT LEAK CHECK  ).
  4. Evacuate the system. The vacuum pump should run for a minimum of 30 minutes to eliminate all moisture from the system. When the suction gauge reads -93.3 kPa (-700 mmHg, -27.55 inHg) for at least 30 minutes, close all valves, and turn off the vacuum pump.
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