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Spirovent placement

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Posted by Dave on December 08, 2005 at 12:33:55:

I know that you said that Spirovent would be redundant in my system the wat it is set up, but my plumber (who has been a great sport about planning/revising the system) is insisting on one, as he says that we will have air problems without something on the boiler loop.
For a little extra money, I am willing to add this one extra part.
My question is the way that it will interact with the supply header.
I was going to:

1.have him attach the 2" pipe that brings water back to the boiler directly to the buffer tank (no tee). Obviously, this would be reduced to 1.5 at tap for buffer tank.
2. Then there would be a tee attached to the makeup water valve.
3. 12" beyond that makeup water valve would be the 2" Spirovent attached to expansion tank.
4. Shortly after the Sprirovent (6-12"), the supply manifold would tee into the 2" pipe.
Does that all sound ok? I realize it may be redundant with the other air vents, but he is insisting.
Would there be any issues with flow into the supply header when the boiler is not running (individual zone pumps having to pull water from the buffer through the Spirovent)?
Thanks again.

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