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Refrigerant System Evacuate

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If refrigerant system has been open to atmosphere, it must be evacuated before system can be charged. If moisture and air enters system and becomes mixed with refrigerant, compressor head pressure will increase to greater than acceptable operating levels. This will reduce the performance of air conditioner and damage compressor. Evacuating refrigerant system will remove air and boil moisture out of system at near room temperature.

To evacuate refrigerant system, use the following procedure:

  1. Connect a R-134a refrigerant recovery/recycling/charging station and a manifold gauge set to refrigerant system of vehicle.
  2. Recover refrigerant.
  3. Open low and high side valves and start charging station vacuum pump. When suction gauge reads 26 in. Hg. (88 kPa) vacuum or greater, close all valves and turn off vacuum pump. If refrigerant system fails to reach specified vacuum, system has a leak that must be corrected. If refrigerant system maintains specified vacuum for 5 minutes, restart vacuum pump, open suction and discharge valves and evacuate system for an additional 10 minutes.
  4. Close all valves and turn off charging station vacuum pump.
  5. Refrigerant system is now ready to be charged with R-134a refrigerant. See REFRIGERANT SYSTEM CHARGE .

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