Automatic air vent

[Deleted User]

Alan is correct about pumping away and Spirovent. Why was the pipe size reduced? Did you remove some radiation? Hope someone did the math.

Sometimes it is a good idea to increase the size of the air scoop or Spirovent to reduce the velocity at the point of air elimination. Allows the device to catch the bubbles more efficiently.

Alan is also correct about increasing system pressure to vent the air. Increased pressure reduces the bubble size and moves them to where you are venting.

Can't speak to the air vent you have. We use Sparco or Taco Vents. Good luck.

Dan M_3

Automatic air vent

My single zone two pipe hot water sytem uses a automatic air vent mounted directly across from the expansion tank. The system is constructed entirly of 1" copper pipe. The piping was just replaced this year from much larger steel pipe. The air vent doesnt work . I also dont get very much of the air out when i manually vent at each radiator. I can here air in the pipe moving past the vent with out being captured by it. I have excellant flow througth the system using a single Taco 007 pump. With the old larger pipe the vent worked somewhat better, but not perfect ( the vent is a Honeywell Braukmann plastic job mounted on top of a one of those air scoops)I have taken the vent apart and cleaned the vent seat and even removed it to check the position of its air scoop several times. With the new piping do you think the water is moving at a higher velocity and shooting by the scoop ? Is their a brand or model of air purger that is better at catching moving air than what i am using?

Thanks
Dan

Alan(CaliforniaRadiant)Forbes

You might

need to remove the air scoop and install a more sophisticated air elimination device; trade names: Spirotherm, Vortec (made by Taco), etc.

If the air bubbles are small, they will stay in solution and by-pass the air scoop. Better air eliminators will slow down the flow of water by widening the path and are engineered to extract the air bubbles and move them up to the air vent.

Before you change it out, I've had good luck at air elimination by raising the pressure. Also, make sure your circulator is pumping away from the expansion tank.



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John Reves

Automatic air vents

Still unsure about the location of any air vents on my 30 year old oil-fired hydronic system which habitually accumulates air. Circ pump is in front of boiler pumping into boiler with expansion tank on other side (back) of boiler. Don't know yet if expansion tank is bladder type. It may have integral air vent but if so, very ineffective. Certainly no overhead air vents anywhere in the system that I can find.

Would it do any harm to install additional air vents such as spiratherm, vortec or sparco in each of the loops or at high points in the piping? Numerous plumbers/contractors have looked at system and seem clueless about how to fix air problem.