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crackling in hot water heat system

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Tim_5
Tim_5 Member Posts: 37
in THE MAIN WALL
we have hot water heat in our home and i am getting a crackling sound in a set of supply and return risers, i would suspect it is trapped air rolling around, i,ve tried flushing from my upstairs manifold but doesn't seem to help.
Any ideas are welcome,
Thanks,Tim

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  • ed wallace
    ed wallace Member Posts: 1,613
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    crackling

    what kind of exp tank does it need draining? do you have an air separater? is it bb or rads or radiant or hydro air?

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  • Tim_5
    Tim_5 Member Posts: 37
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    Crackling

    Ed, the expantion tank is a small Watts I believe, the air seperator is a B&G lacated on the make up connection, and it is in floor radiant with Wirsbo Tube and manifolds, i have a 3 loop manifold in my closet that seems to be closest to the sound but when i bleed water from the hose connection i don't get any air pockets flushing out.
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