Automatic air vent Afriso G3/8" for solar installations, model 77900

The Automatic air vent Afriso G3/8" for solar installations, model 77900 is designed to remove entrapped air from solar heating and hot-water circulation systems. The device features a G3/8" threaded connection suitable for installation on collectors, manifolds or piping. Continuous automatic venting improves hydraulic performance, reduces noise and helps limit corrosion by preventing persistent air pockets in the system.

Advantages

This automatic air vent provides continuous, maintenance‑free deaeration during normal system operation, helping to maintain steady flow and heat transfer efficiency. The compact design and standard G3/8" thread make it easy to fit at common high points in solar installations. By removing air automatically, the device reduces knocking and noise in pipes and lowers the risk of localized corrosion and pump cavitation.

Suitable for

• Solar thermal collectors and collector loops
• Hydraulic manifolds and distribution headers
• Piping high points and risers in hot-water circulation systems
• Closed-loop solar heating and domestic hot-water systems

Key specifications

• Threaded connection: G3/8" suitable for standard fittings
• Function: Automatic continuous air venting for liquid circuits
• Application: Solar heating and hot-water circulation systems
• Installation position: High points, manifolds, collectors or risers
• Material: corrosion-resistant body (manufacturer design for solar use)

How to use

Install the air vent at system high points, on collectors or manifolds using the G3/8" threaded connection. Ensure the device is accessible for inspection and that the installation position allows trapped air to collect at the vent. Tighten to the recommended torque for the chosen fitting material and check for leaks after filling and pressurising the system. The unit vents automatically during normal operation; no manual actuation is required.

Usage recommendations

During commissioning, perform an initial purge of the system to remove bulk air before relying on the automatic vent for continuous fine deaeration. Periodically inspect the vent for signs of external leakage or damage and verify system pressure and flow to ensure proper operation.