Loud clunk when humidifier turns off

Discussion in 'HVAC Heating & Cooling' started by rschmitty, Feb 16, 2009.

  1. rschmitty

    rschmitty New Member

    Joined:
    Jan 24, 2009
    Location:
    Indiana
    Recently I had a humidifier repaired, it needed a new solenoid. The humidifier never worked since we moved in but now that it is working, anytime it shuts off there is a loud clunk that can be heard around the house.

    When I stand in front of the humidifier it doesnt sound as loud as I would have expected, seems like its coming from inside the pipes? Not sure how to describe it


    Is this normal or is there something I can do or adjust?
     
    Last edited: Feb 16, 2009
  2. Hube

    Hube New Member

    Joined:
    Sep 1, 2004
    Location:
    Ontario
     
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  4. rschmitty

    rschmitty New Member

    Joined:
    Jan 24, 2009
    Location:
    Indiana
    oops.. 'now that its working'

    sorry
     
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    You may need to add a water hammer arrestor in-line. Solonoid valves open and close quickly. Opening isn't usually an issue, but closing can be - water has inertia...and it wants to keep moving. It will have to stop quickly when the valve closes, and this can cause things to move.

    A hammer arrestor has a piston and a sealed air chamber or an air bladder (depends on the type). It needs to be installed close to the offending valve. But, it will be a long-term solution that should fix the problem. Sioux City, Watts, and others make them. They aren't particularly expensive ($10 or so), and should solve your problem, but they do require installation.

    [​IMG]
     
    Last edited by a moderator: Feb 22, 2009
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