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Thread: Loud clunk when humidifier turns off

  1. #1

    Default Loud clunk when humidifier turns off

    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 by rschmitty; 02-16-2009 at 06:34 AM. Reason: fixed 'not that its working' to 'now that its working'

  2. #2
    DIY Senior Member Hube's Avatar
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    [QUOTE=rschmitty;185027]Recently I had a humidifier repaired, it needed a new solenoid. The humidifier never worked since we moved in but not that it is working, anytime it shuts off there is a loud clunk that can be heard around the house.

    __________________________________________________ __________
    ...."but not that its working."
    Huh!! is this a typo or is it working or not?
    can't make any sense out of the question

  3. #3

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    oops.. 'now that its working'

    sorry

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    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.

    Last edited by Terry; 02-22-2009 at 09:12 AM.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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