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Munchkin boiler problem . Need Help!!

Jason Proctor
Jason Proctor Member Posts: 6
in THE MAIN WALL
I am having trouble keeping an 80K BTU Munchkin boiler firing. The boiler was built in 2001 and had a defective gas valve. I replaced the valve and installed the brass LP orifice. I have 11.5 “ W.C on the inlet side of the valve. When I call for heat the boiler fires for approx 5 seconds and then drops out. I have tried adjusting the air intake starting at around 6.5 turns off closed but can’t seem to get any change in performance. I have cleaned the spark probe and get a quality spark, cleaned the flame rod and have cleaned the combustion chamber.

I would really appreciate any advice on this


Thanks


Jason Proctor

Comments

  • Mark Eatherton1
    Mark Eatherton1 Member Posts: 2,542
    Whats your fuel pressure doing...

    during this whole process. I had one do the same thing. THe main shut off valve to the system had been partially closed. Enough residual pressure in the line to allow firing, then would peter out and shut down. Keep your manometer on the gas train while doing the run stop thing.

    ME
  • Dick Carlson
    Dick Carlson Member Posts: 13


    You need a combustion analyzer to setup this boiler. If the CO2 isn't in spec. you get a weak flame signal. Have you checked the flame signal?
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