American Granby Harvard Deep Well Air Release / Air Volume Control 1 1/4" Mpt

Air Ejector Control For Deep Well Water Systems releases air only, submersible pumps only.

Pressure Release Valve Adjustment:

• The HARVARD® plastic deep well air release is factory set at 25 psi
• Max release valve pressure setting is 40 psi - Min setting is 0 psi
• Pressure setting is increased by turning the adjusting screw clockwise, and lowered by turning the adjusting screw counterclockwise
• One full rotation of the adjusting screw changes the setting by 5 psi

• Excessive air in a non-bladder style tank will continue to lower the water level in the tank to the extent of discharging air into the service line
• As the water level is lowered, the deep well air release float is also lowered, opening the release valve
• This allows the excess air to bleed out of the tank until the release valve setting is reached (Factory set at 25 psi)
• As the pressure in the tank lowers to the cut-in setting of the pressure switch (usually 20 psi), the pump starts and forces water and air into the tank until the pressure has reached the cut-out setting of the pressure switch (usually 40 psi)
• As the water level rises, it raises the float which closes the release valve before the water level reaches the valve; a process that is repeated as the pump cycles