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Operation Procedure for Refrigerant Charge: Evacuation

CAUTION: Attempting to evacuate the A/C system when refrigerant remains in the system will damage the vacuum pump. Do not evacuate the A/C system before completely recovering the refrigerant from the system.
NOTE: Once air conditioning system circuit is opened (exposed) to atmospheric air, system must be evacuated by using a vacuum pump. The A/C system should be attached with a manifold gauge set, and should be evacuated for approximately 15 minutes.
  1. Connect high charging hose (1) and low charging hose (2) of manifold gauge set (3) (special tool) respectively as follows:

    High charging hose → High pressure charging valve (4) on discharge hose

    Low charging hose → Low pressure charging valve (5) on suction pipe

    Special Tool 

    (A): 09990-06020 Manifold gauge set (R134a)  Refer to SPECIAL TOOL

  2. Attach center charging hose (6) of manifold gauge set to vacuum pump (7).
  3. Operate vacuum pump, and then open discharge side valve (Hi) (8) of manifold gauge set.

    If there is no blockage in the system, there will be an indication on high pressure gauge (9).

    When this occurs, open the other side valve (Lo) (10) of the set.

  4. Approximately 10 minutes later, low pressure gauge (11) should show a vacuum lower than -100 kPa (-1.0 kgf/cm2 , -760 mmHg, -14.7 psi) providing no leakage exists.
    NOTE:
    • If the system does not show a vacuum below -100 kPa (-1.0 kgf/cm2 , -760 mmHg, - 14.7 psi), close both valves, stop vacuum pump and watch movement of low pressure gauge.
    • Increase in the gauge reading suggests existence of leakage. In this case, repair the system before continuing its evacuation.
    • If the gauge shows a stable reading (suggesting no leakage), continue evacuation.
  5. Evacuation should be carried out for a total of at least 15 minutes.
  6. Continue evacuation until low pressure gauge indicates a vacuum less than -100 kPa (-1.0 kgf/cm2 , - 760 mmHg, -14.7 psi), and then close both valves.
  7. Stop vacuum pump. Disconnect center charging hose from pump inlet. Now, the system is ready for charging refrigerant.
    Fig 1: Attaching Center Charging Hose Of Manifold Gauge Set To Vacuum Pump
    G06867653Courtesy of SUZUKI OF AMERICA CORP.
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