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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 the high and low side service valves. See SERVICE VALVE LOCATIONS under SYSTEM SERVICE VALVES in this article.
  2. Fully open both valves on manifold gauge set. Connect a discharge hose to center connector on manifold gauge set. Place discharge hose in shop exhaust hose or in well ventilated area.
  3. Open service valves slightly to the mid-position. DO NOT discharge refrigerant rapidly, as refrigerant oil will be lost from system. Once discharged, close valves on manifold gauge set to prevent entry of moisture into system.
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