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Evacuating A/C System

  1. Close both valves on manifold gauge set. Connect manifold gauge set to high-side and low-side service valves. See SERVICE VALVE LOCATIONS under SYSTEM SERVICE VALVES. Connect a hose to center connector on manifold gauge set and evacuation pump.
  2. Open both valves on manifold gauge set. Operate evacuation pump until low-side vacuum reading is at least 29.5 in. Hg. Continue operating evacuation pump for 30 minutes.
  3. Close both valves on manifold gauge set. Turn off evacuation pump. Observe low-side gauge. Any loss of vacuum in 5 minutes indicates a system leak. Perform leak testing procedure, and repair system as necessary. See LEAK TESTING.
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