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System Evacuation

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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, the receiver/dryer should be replaced, refrigerant oil should be drained and replaced with new oil, and the system should be evacuated for several hours.
  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, following the equipment manufacturer's instructions. Recover the refrigerant, if any, from the A/C system (see REFRIGERANT RECOVERY  ).
    Fig 1: Locating R-134a Refrigerant Recovery/Recycling/Charging Station, High-Pressure Service Port And Low-Pressure Service Port
    G06424203Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Evacuate the system. The vacuum pump should run for a minimum of 45 minutes to eliminate all moisture from the system. When the suction gauge reads -93.3 kPa (-700 mmHg, -27.55 inHg) for at least 45 minutes, close all valves, and turn off the vacuum pump.
  4. 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  ).
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