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Humming Furnace

Unknown
Unknown
in THE MAIN WALL
why does it humm, cause it can't sing. Just kidding, look for incorrect orfice sizing or gas pressure or gas piping size. 99% sure your pressure of set wrong or not enough volume.


Peace Be With You

David C. Broome

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Comments

  • Mike Pfluke
    Mike Pfluke Member Posts: 9
    Weatherking Rumble

    Help.While installing a new furnace at a two family house my attention was drawn to the newly installed 2nd floor furnace. Someone installed a Weatherking model 90RJ10EGS01 2 YEARS AGO. Every time this furnace fires up it makes a harmonic rumbling sound through the heat exchanger. The unit vibrates and rumbles for about 45 seconds, (warms the exchanger) then disappears until the next cycle. The installer came back 2 times and told this little old man that it was normal. I have been in the HVAC Business 20 years, it is not normal.....any ideas?Help.While installing a new furnace at a two family house my attention was drawn to the newly installed 2nd floor furnace. Someone installed a Weatherking model 90RJ10EGS01 2 YEARS AGO. Everytime this furnace fires up it makes a harmonic rummbling sound through the heatexchanger. The unit vibrates and rummbles for about 45 seconds, (warms the exchanger) then dissapears until the next cycle. The installer came back 2 times and told this little old man that it was normal. I have been in the HVAC Business 20 years, it is not normal.....any ideas?
  • Mitch_4
    Mitch_4 Member Posts: 955
    how is it installed? upflow? horizontal?

    check the IOM and see if the basics are done.
  • Jerry_15
    Jerry_15 Member Posts: 379


    I know this is too simple but is there a really long flex connector? I see it all the time, grab the gas line when it's making the noise and if it changes the sound either shorten it or re-pipe. I only keep 3/4 lines on the truck so I don't have to mess withit on my own installs. Check the manifold pressure while your at it. Also check the static inlet pressure. Sometimes a monster inlet can make the gas valve do amazing things.
  • Terry_14
    Terry_14 Member Posts: 209
    Orafaces

    Had one problem with harmonic sound same thing another said normal to humm.

    Gas pressure was high 4.5 " and oraface size was small and not spec. The temp rise was good but that humm went through the whole house..

    Smile and share one
    Terry
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