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air in hydranic loops

Paul Pollets
Paul Pollets Member Posts: 3,661
If the pump is installed on the supply header and pumping away from the expansion tank, there will be minimum of air in the system and purging will be a thing of the past, after the first fill. If the pump is on the return, you will be chasing your tail.... Always recommend a Spirovent or high quality micro-bubble absorber. The expansion tank should have a 12-14PSI charge within, when system pressure is 0 psi.

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Comments

  • allenh
    allenh Member Posts: 117
    air in hydranic loops

    Have a system that I have to bleed air out of every few days. This just started happening a couple of weeks ago. Visually there are no leaks in boiler or plumbing that is visible. Boiler pressure ~ 20 psi for 3 floors living space plus basement where boiler is located. Rise from top of boiler to highest point is around 28'.

    Can a slant fin boiler generate air? Could those little air floats foul and let air in?

    Chasing my tail here. I hate pumps on return side as we seem to have more air bound calls.
  • hothead
    hothead Member Posts: 21
    vent your problems

    hats off to the euro engineering again. Spirovent!!Install it and no more air problems.

    John "Heat on" Helsel
  • Bill Zee
    Bill Zee Member Posts: 1
    hydronic boiler pressure

    If the boilers normal pressure is 18 psi and increases to a higher pressure, let's say 28 psi, what effect will the higher pressure have on the operation of the system such as pump operation or efficiency?
  • Bruce Marshall
    Bruce Marshall Member Posts: 37


    At 28 psi, I would be more concerned with the relief valve opening, letting more air into the system, and thereby perpetuating the airbound problem.
  • Brstr
    Brstr Member Posts: 26
    Relief valve

    @28' of head you only have 12.12psi. Include 3psi to keep the highest point from "steaming" and you will not have any problems with the 30psi relief valve.
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