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Steam Coil

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Boiler Guy
Boiler Guy Member Posts: 585
in THE MAIN WALL
Dan, MadDog, Steamhead I recently replaced a 2 pipe steam coil that has now started continually knocking. The original coil had 14 return bends on 5/8 tubing the new one has only 12 on 3/4 tubing. THe header configuration is the same. THe coil is fed by a 3/4 steam line @ 3# through a slow opening H/W zone control. The trap has been checked and appears to be working correctly. I recently reduced the steam flow through the coil which seemed to help. Any suggestions?

THanks Tim

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  • MikeC_2
    MikeC_2 Member Posts: 14
    Coil stall

    A steam coil will not drain all the condensate out or stall after the control valve closes and the trap is closed.The steam collapses causing a vacumm,coil won't completely drain.Try installing a vac. breaker after the conrol valve.The old boys used to install a small 3/8"bypass line around the trap cure stall problems.
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