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Discharging A/C System

NOTE: Recent findings by the EPA indicate that refrigerant is harmful to the Earth's protective Ozone layer. When discharging refrigerant, avoid allowing refrigerant to enter the atmosphere. Refrigerant recovery/recycle system should be used whenever possible instead of discharging system. Many states now require by law the use of recovery/recycle systems. Check local laws before proceeding.
  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.
  2. Connect a discharge hose to center connector on manifold gauge set. Place end of discharge hose in oil collection can (clean coffee can with slit in lid) in a well ventilated area.
  3. Slowly open high and low gauge valves and drain system. When system has drained, measure amount of refrigerant oil collected in oil collection can. Replace that amount of clean refrigerant oil before charging A/C system.
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