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My Munchkin is \"humming\"

Mary Kaltenbach
Mary Kaltenbach Member Posts: 2
in THE MAIN WALL
My new single-level home has a hydro-air heating system that is powered by a Munchkin boiler that is fueled by propane. This is in the basement and the air handler and rest of ductwork is in the attic. When the outside temp is in the teens or lower, there's a loud tone (single frequency) coming from the Munchkin. The service guy thought it was from the propane supplying the boiler, but that doesn't sound right to us. Holding onto the gas supply line does not affect the frequency or loudness. Any ideas? Thanks!

Comments

  • Mark Eatherton1
    Mark Eatherton1 Member Posts: 2,542
    It's humming because...

    it doesn't know the words:-)

    Have your technician call Heat Transfer Products, and have him have a combustion analyzer so he can fine tune it.

    Without a combustion analyzer, he shooting in the dark.

    ME
  • steve gates
    steve gates Member Posts: 329


    If gas line is using a flex it could be to small on hi fire.

    Gas flexes can also be used for elk calling.
  • Bart_2
    Bart_2 Member Posts: 18
    definately

    the flex line if I had to guess, those things can whistle like crazy sometimes....
  • chuck shaw
    chuck shaw Member Posts: 584
    how often does this need to be said

    call the tech support team they have. Guy and Chuck are wonderful. You probally would have had an answer hours ago. If they cant help you fix it. Who can???

    Rebel
  • JohnWood1
    JohnWood1 Member Posts: 63
    Exhaust gas recirc?

    There is a very good chance that it could be the products of combustion are making their way back into the fresh air for combustion. This will make a munchkin "sing" and should be looked into soon. Otherwise? Could be needing adjustment of the gas/air ratio. Have heard 80M's get noisy at lowest fire, short venting and "off spec" fuel ratios.

  • JohnWood1
    JohnWood1 Member Posts: 63
    Exhaust gas recirc?

    There is a very good chance that it could be the products of combustion are making their way back into the fresh air for combustion. This will make a munchkin "sing" and should be looked into soon. Otherwise? Could be needing adjustment of the gas/air ratio. Have heard 80M's get noisy at lowest fire with short venting and "off spec" fuel ratios.

  • Randy Tibbits
    Randy Tibbits Member Posts: 91


    Do you have anti-freeze in the system? If so do you know the pecentage of anti-freeze? I have heard a munchkin howl from a flow problem brought on by to much anti-freeze. Just a thought.
  • Mary Kaltenbach
    Mary Kaltenbach Member Posts: 2


    Yes, it has anti-freeze, but we don't know the percentage. The service guy purged some water (maybe a gallon?) into a bucket to put in the anti-freeze. And, yes, the gas supply line is flexible, 1" O.D. (yellow).
    We did have a couple of instances where the system turned off because of back pressure drafts on windy days. Since putting up a plywood windbreak, that hasn't happened again. The "humming" did start around the time of those windy days because that's when it also got very cold here. We'll try re-arranging the windbreak to seperate the intake and exhaust vents some more. Then, we'll have more info for the service and tech support guys.
    Thanks!
  • Geno_15
    Geno_15 Member Posts: 158
    My Munchkin is \"humming\"

    dear liza, dear liza,
    My Munchkin is "humming"
    dear liza, it humms

    well what is it humming dear henry?



    sorry, couldn't help myself
  • Guy_5
    Guy_5 Member Posts: 159
    Hummmmm

    With the cold weather statement comes two different thoughts:
    1) The hum may be coming from an improper gas/air mixture. The cold inside the cabinet can cause noises if the mixture is a little lean. Once incoming air warms up, there is a more hospitable enviornment for the flame.
    2) Does the condensate drain run directly outside? If it is freezing, or being partially blocked, the resulting (water) back up restricts the flue passages within the boiler. Although this does not pose any danger, it will diminish the capability of the boiler, and at the very least, is an annoyance.
    Feel free to call me at 800 323-9651 Ext. 157
    Guy Woollard
    Heat Transfer Products
  • Mad Dog
    Mad Dog Member Posts: 2,595
    You funny M.E.

    as Mark said, call Chucxkie and company - they are tops. Mad Dog

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • JohnWood1
    JohnWood1 Member Posts: 63
    Plywood wind block...........................

    is probably the cause of the recirculation of flue gasses and the noise.
  • jerry scharf_2
    jerry scharf_2 Member Posts: 414
    I think you hit it

    John,

    Great suggestion. I could easily imagine a vortex forming downwind doing exactly that.

    jerry
This discussion has been closed.

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