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Do I need some kind of vent or air separator at this return main high point?

newtonkid88
newtonkid88 Member Posts: 100
edited August 18 in Radiant Heating
I was planning on capping off the top tee. But should I put some kind of vent up there? Should it be an elbow instead?

The vertical pipe goes back into the boiler.

The two horizontal pipes are from the return sides of caleffi manifolds.

This tee is the highest point in the basement plumbing, other than the hePex risers from the manifolds going up to the HWBB. All the HWBB have bleeder valves.

There is a spirovent microbubbler air remover on the supply side of the boiler, but it is not at a high point.



Comments

  • mattmia2
    mattmia2 Member Posts: 6,655
    edited August 18
    Any air in that dead end should eventually dissolve and find its way to the air separator. As long as you can purge through it to establish flow it should be fine.
    newtonkid88Zman
  • JUGHNE
    JUGHNE Member Posts: 10,044
    In places like that I have put in some means to vent the air manually.
    An auto vent is always a potential leaker and sometime lets air in.

    You may only need it on initial water fill.

    Having a lot of misc fittings myself, I have used a male pipe thread X flare fitting with flare cap....easy to loosen and reseals tight.
    newtonkid88
  • newtonkid88
    newtonkid88 Member Posts: 100
    edited August 18
  • JUGHNE
    JUGHNE Member Posts: 10,044
    Do you have a 1/2 bushing on the top of the tee?

    Any size will work, for me it is what ever is handy and often used.
    Flare cap fittings need no sealant for this purpose.
    newtonkid88
  • newtonkid88
    newtonkid88 Member Posts: 100
    JUGHNE said:
    Do you have a 1/2 bushing on the top of the tee? Any size will work, for me it is what ever is handy and often used. Flare cap fittings need no sealant for this purpose.
    Yes, i could not find a 1” plug at the time so I used a 1” to 1/2” reducer bushing. Then just plugged that with a 1/2” plug.
  • mattmia2
    mattmia2 Member Posts: 6,655
    You could also just bush it down to 1/8" and put a coin key vent there.
    newtonkid88
  • newtonkid88
    newtonkid88 Member Posts: 100
    edited August 19
    mattmia2 said:
    You could also just bush it down to 1/8" and put a coin key vent there.
    I have thought about this. This may be the easiest.

    https://www.supplyhouse.com/Ward-FBHE1x1-8-1-x-1-8-Black-Hexagon-Bushing-754000-p
  • hot_rod
    hot_rod Member Posts: 17,531
    A $2 black plug the size of the tee! You loosen a turn or two until bubbles stop. I suspect it is a one use need if you have piping above that point.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    PC7060