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Thread: Ka - BOOM

  1. #1
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    Ka - BOOM

    Had a call where a tenant could hear loud booming sounds on the roof. She had a pool heater do the same thing, so pretty well knew what was going on. The dispatcher calls me asking my time frame for the call I was on, then questioned what makes a heater go boom.

    I told him delayed ignition. Probably something simple. Like maybe a restricted pilot orifice. When I got on the job, I removed the pilot and had it light so I could inspect the flame. Looked decent enough. Figured I'd tweak the bracket a bit to get it closer to the burner bar.

    Re-assembled and fired the unit off. Lit right away. Heat felt a bit weak coming out of the flue. Then I smelled it. Natural gas coming out of the flue. While the burners were lit. I'm like holy crap! As I turned to run around to the other side to shut it down, ka-BOOM. Freaked the hell out of me; got a quick adrenalin rush out of it.

    Several orifices weren't even feeding into the burner bars any more! Heat exchanger cracked all over.

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    A skilled Tech would solder a relay on that board and call it good to go.

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  3. #2
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    8 burners, 160 to 200 cfh, yikes i'll bet that went boom....

    glad you didnt have your face in there watching it.
    my boss thinks its possible to repeal the laws of physics

  4. #3
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    Had to get the blood flowing quickly.
    Duck and run

    Edit-disregard. That pic didn’t work right.
    Attached Images Attached Images  
    “I haven’t failed. I’ve just found 10,000 ways that won’t work.” - Thomas Edison

    “It’s not whether you get knocked down, it’s whether you get up.” - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

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  6. #4
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    I never put myself in front of a gas fired heater when I first start it. I sat well off to the side, but could still sort of see the pilot. After it fired, I thought I saw the heat waves coming out of it, so I stood to feel the heat with my hand. Then about 1.283 seconds later, which is about how long it took to realize what was going on, . . .


    Quote Originally Posted by ch4man View Post
    8 burners, 160 to 200 cfh, yikes i'll bet that went boom....

    glad you didnt have your face in there watching it.
    A skilled Tech would solder a relay on that board and call it good to go.

  7. Likes DavidDeBord liked this post
  8. #5
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    Scary BB...glad you were not hurt.
    “Now the freaks are on television, the freaks are in the movies. And it’s no longer the sideshow, it’s the whole show. The colorful circus and the clowns and the elephants, for all intents and purposes, are gone, and we’re dealing only with the freaks.” - Jonathan Winters

  9. #6
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    Quote Originally Posted by BBeerme View Post
    I never put myself in front of a gas fired heater when I first start it. I sat well off to the side, but could still sort of see the pilot. After it fired, I thought I saw the heat waves coming out of it, so I stood to feel the heat with my hand. Then about 1.283 seconds later, which is about how long it took to realize what was going on, . . .
    yep one of the first things i teach our new guys. never, ever stand in front of the fire. stand aside and use your mirror
    my boss thinks its possible to repeal the laws of physics

  10. #7
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    Actually, there were something like 15 burners. 400,000 btu furnace, I think. I'll see if I can get another photo off of the work phone.


    Quote Originally Posted by ch4man View Post
    8 burners, 160 to 200 cfh, yikes i'll bet that went boom....

    glad you didnt have your face in there watching it.
    A skilled Tech would solder a relay on that board and call it good to go.

  11. #8
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    Thanks. I haven't been freaked like that for quite some time!


    Quote Originally Posted by coolwhip View Post
    Scary BB...glad you were not hurt.
    A skilled Tech would solder a relay on that board and call it good to go.

  12. #9
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    geez something that big should have multiple safeties
    my boss thinks its possible to repeal the laws of physics

  13. #10
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    Yeah, looks like there are 15 burners. Third photo in the OP is pretty much the same as one on my work phone.

    You'll note that six burners are not getting fed by their respective orifice. Only four burners before those six. Which means no cross over ignition. So only four of fifteen burners lit. The other eleven were just dumping raw gas. Waiting for a kiss of the flame.

    No wonder someone in the building was hearing when the heater fired off!
    A skilled Tech would solder a relay on that board and call it good to go.

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  15. #11
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    This is the one off of the work phone. One burner has been removed.

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    A skilled Tech would solder a relay on that board and call it good to go.

  16. #12
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    There's a high limit.


    Quote Originally Posted by ch4man View Post
    geez something that big should have multiple safeties
    A skilled Tech would solder a relay on that board and call it good to go.

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  18. #13
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    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"


    .
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"

    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

    Jtrammel - "I’m going to sell hvac systems derp derp derp"
    BBeerme - "every time he opens his mouth, he reminds me of a cow without the fart bag."

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