To the tank, or perhaps on the side of the tank with a plastic or copper tube connecting the disc to a fitting on the tank or nearby piping, this is the AVC. If you see a round steel disc of about 4" diameter and about 1" thick on the water tank, mounted perhaps at the middle of the tank height or at the water outlet The tank from time to time as water pressure cycles up and down, that is, each time that the water pump runs. The AVC is intended to automatically put a little bit of replacement air into Round Air Volume Control Devices With Copper TubeĪn "automatic" air volume control (AVC) device may be installed on the water pressure tank if it's an older, bladderless steel tank. The water pump turning on and off rapidly - "short cycling" of the water pump. If a water tank loses its air charge it stops working properly and usually results in The air volume control or "AVC" device mounted (usually) on older steel water tanks (ones that do not useĪn internal bladder to keep water and air separate) is designed to automatically add air to the water pressure tank The job of the AVC is to keep air in the water tank to avoid waterlogged water tanks or well pump short cycling.
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