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Hydronic Heating

terry_5
terry_5 Member Posts: 92
in THE MAIN WALL
Are the zone valves on the supply or returns?

Comments

  • T.W.
    T.W. Member Posts: 5
    banging noise/hydronic heat

    The boiler information is listed below for this bi-level house: approx. 50-75,000 BTU
    Hydrotherm approx. 35-40 yrs. old/ millivolt gas valve
    Taco 007/with ciculator relay (on return/1")
    (2) Honeywell zone valves (1yr.old on supply..3/4" with 1" feed)
    (2) 3/4" return lines with shutoffs & purge valves (1" feed)
    tridicator is not reading properly
    The problem is with the 2nd flr. zone in the rear bedroom....the customer hears the pipes shake in the middle of the night during normal heating season (mostly when it shutsdown). When I was testing both zones...it was approx. 68 degrees inside & about 65 degrees outside. Both zones were extremely quiet & I did not hear any banging noise.
    Please advise Thanks, T.W.
  • Josh_10
    Josh_10 Member Posts: 787


    Any chance the zone valves are installed backwards?
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,600
    This

    should help:

    Banging Zone Valves

    It pays to wander off the Wall.
    Retired and loving it.
  • tom_49
    tom_49 Member Posts: 269
    banging

    Tom,

    Sounds like it may be those Honeywell ZV's closing to quickly causing a "hammer" effect.
    I like the taco ZV for this and other reasons.



  • Josh_10
    Josh_10 Member Posts: 787


    Dan, any chance this could be solved by installing a differential pressure by-pass? Or would it open too slowly? Just curious if you have exhausted that idea already.
This discussion has been closed.

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