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Refrigerant Charging: Evacuation

  1. Open all the valves of the manifold gauge.
    CAUTION:
    • Close the manifold gauge valve immediately after stopping the vacuum pump. If the valve is left open, the vacuum pump oil will back flow into the refrigeration cycle and cause a decrease in the efficiency of the air conditioner.
  2. Start the vacuum pump and let it operate for 15 min.
    G13728810Courtesy of MAZDA MOTORS CORP.
  3. Verify that high- and low-pressure side readings of the manifold gauge are at -101 kPa {-760 mmHg, - 29.9 inHg}. Close each valve of the manifold gauge.
    G13728811Courtesy of MAZDA MOTORS CORP.
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