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Evacuating A/C System

  1. Close both valves on manifold gauge set. Connect manifold gauge set to high and low side service valves. See SERVICE VALVE LOCATIONS in this article. Connect a hose to center connector on manifold gauge set and evacuation pump.
  2. Open both valves on manifold gauge set. Start evacuation pump and operate until low side vacuum reading of at least 25 in. Hg is obtained.
  3. Continue operating evacuation pump for 15 minutes. If compressor, evaporator, refrigerant line, etc. have been replaced, operate evacuation pump for at least 30 minutes.
  4. Close both valves on manifold gauge set. Turn off evacuation pump. Observe low side gauge. If vacuum reading drops in 5 minutes, system has leak. Perform leak testing procedure and repair.
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