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munchkin trouble

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Mikes mad pipes
Mikes mad pipes Member Posts: 15
in THE MAIN WALL
I installed a 140M natural gas in oct. 02. I went to the customers house to watch and listen today. The boiler was off when I got there, temp. of water was 55. Turned t-stat up boiler fired and it sounded like the flame was shuttering and the boiler shook for 1/2 a second. Boiler got up to temp. and it's running ok. Customer said it doesn't happen every time just now and then, also he gets a strong smell sometimes after when it really has a hard time firing. Sorry to say I've called and left 2 messages on the dreaded voice mail, 1 friday the 7th and 1 today no response from the tech. dept. I just want to know what to look for and how. I contacted my supplier about training the last time I had a problem but haven't heard back. I work hard to keep my customers happy,theirs no excuse for not hearing back from them.

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  • Mark Hunt
    Mark Hunt Member Posts: 4,909
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    Was there


    an error code flashing?

    Mark H

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  • munchkin-man
    munchkin-man Member Posts: 247
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    checked all my phone notes

    I only have one call from you at 4:00pm on 03-11-03. I will contact you today at some point.
  • Dennis Bellanti
    Dennis Bellanti Member Posts: 6
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    Sounds like you may have delayed ignition. Sometimes opening up the spark gap can solve this problem.
  • Mark Hunt
    Mark Hunt Member Posts: 4,909
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    Or


    a grounding issue.

    Call John Sawyer.

    Mark H

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  • Dan Law
    Dan Law Member Posts: 59
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    Rumbling

    Hey Jeff, I'm not in the residential biz, and Munchins are new to our area this
    year, so really no experience. However, I've had similar wackiness in low mass,
    high efficient boilers used on Snowmelt application. (Raypak ADBs). Except it
    wasn't a couple of seconds problem that the burner worked itself through, our
    resulted in lockout.

    Ultimately, we corrected the rumbling and lock out by
    increasing the EWT to the boiler by throttling discharge and increasing bypass
    (80% by pass w/ 20F loop glycol - PS pumping)

    My read on it was that the condensation of flue gases on the heat exchanger
    surfaces (present with insufficient bypass) were creating excess back
    pressure on the burner head (screen in the Raypak case) and therefore affecting the flame
    propagation rate, causing the loss of flame retention, rumbling and lockout. When
    we got the EWT up, the
    issue resolved.

    First time I'd had flow problems cause such an extreme reaction on the
    combustion side. I’m wondering if in your opinion Mike's post could be similar
    physics on a smaller
    application, given he reports an initial water temp of 55F.
  • john wood
    john wood Member Posts: 44
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    Gas piping issue???

    Am finding more and more that the VOLUME in the gas line feeding a munchkin is critical. They apparently are sensitive to gas pressures fluctuating as the service regulator and the equipment regulator "look" at each other. Small short piping exacerbates the problem. Try a big drip leg somewhere in the piping close to the boiler.
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