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Stoppage in a radiant floor line

Heeltee Member Posts: 20
One of the circuits coming off the supply side of the radiant floor manifold is not allowing water to get thru to the return manifold. What is the best way to clear this circuit? without having to remove the pex tubing . Any ideas / Thanks


  • Gordy
    Gordy Member Posts: 9,546
    dead loop

    Did the loop function properly before?

    IT may be air bound you need to purge that loop.
  • Heeltee
    Heeltee Member Posts: 20
    Stoppage in a radiant floor line

    purge it ! No luck !
  • Gordy
    Gordy Member Posts: 9,546
    Did the loop

    Function before?

    Is this a new install?

    Could there be a kink in the pex?

    What type of radiant?
  • hot_rod
    hot_rod Member Posts: 21,815
    are their actuators

    on the manifold? Could be the valve is stuck in the closed position.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Dave H_2
    Dave H_2 Member Posts: 545
    Manifold Balancing

    Is this loop a long loop compared to the others and maybe is the heat loss to this particular area higher than the rest.

    Slab application?

    Could also be the circulator size?

    Manifolds should be balanced based upon the gpm needed which is calculated by the heat loss of the space. Then size the circ accordingly.

    Dave H.
    Dave H
  • Gordy
    Gordy Member Posts: 9,546
    We don't know

    What you have unless you can tell us.

    This problem could be a multitude of things.

    A side from what's been mentioned.

    Debris in the system

    Frozen loop

    Circ issue.

    Crazy loop length compared to others.
  • davidblack
    davidblack Member Posts: 3
    back feed thru buffer tank.

    thought once had same problem hooked garden hose up to buffer tank closed all loops except one at a time , opened valve on return manifold.  back feed 60 psi of water threw loop.  Ran for 15 minute.  did get a little dirt out.  loops were never flushed when install guess they should of been.