Automatic Air Vent Leaking

I closed the automatic air vent cap completely on the water heater tank when the system was installed last week, because it leaked water.

Automatic air vent leaking. Based on tapping the expansion tank it does not seem waterlogged (bottom 2/3rd of tank sounds hollow or empty). When dry the discs allow air to be released from the system. Jan 31, 2012 thread starter #3 no i didn't mean schrader valve mate, i was watching the mr combi dvd a while back and he said that a leaking aav is a sign that the expansion vessel is gone, just wondered why that may be ?

Jun 6, 2016 #1 hi all i've got a close loop hot water system and am losing pressure: It is white vinegar and baking soda. Installed on water or stream radiators the taco automatic coin vent is the ideal air purging device.

Size the maxivent valves are inspectable thanks to the opening left by the cover after unscrewing it from the tank; It has an air purger with an expansion tank screwed into the bottom and an automatic air vent on top of the air purger. Pressure in expansion tank was low so opened both valves in loop and added water till pressure 1.5, meanwhile automatic air vent has started leaking and expansion tank pressure is dropping.

Having taken off the front cover and had a good look i have identified the part which is leaking as the automatic air vent. It has an automatic air vent on the top, which is leaking quite a bit of water.probably a tablespoon a minute, which i've mitigated with some paper towels to drop onto the floor (this caused other issues, see appendix 1 for other problems if you are interested). Bell & gossett's line of manual and automatic air vents are designed to remove troublesome air in the system.

Having googled the part looks like a replacement is about £10. Here are the photos of the air vent. This wasn't noticed until it had somewhat flooded the cabinet and dripped through to the area where the pump is located;

About 2 bar every week or two. Once all the air is purged the discs would He’ll let the leaking automatic air vent soak in the solution for a few days.