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BTU content of gas too high for orifice in burner

Wrauzckoe Member Posts: 1
Hi, I have a Weil-McLain WTGO series 2 natural draft water boiler that was originally oil fired. In 2008 we converted the burner to a Wayne combustion systems model P250 AF natural gas burner. We have consistently had problems with the flame spreader burning/melting. I have spoke with several people on this issue and some recommend changing the orifice size in the burner, other suggest changing the size of the gas regulator located outside the house before the gas line enters the foundation. The regulator at the house is an Actaris model B31RAS with a 5/16" orifice.  The pressure gauge located inline before this regulator consistently indicates between 8 and 9 PSI. We receive our natural gas directly from a well on the property and have been told that this gas has a much higher BTU rating than natural gas from a commercial source. Any help you may provide on how to best proceed would be very much appreciated.


  • Steamhead
    Steamhead Member Posts: 15,991
    edited October 2013
    I think you might have a static-pressure problem

    that Wayne burner is not the best choice for that boiler. Its fan does not produce enough static air pressure to overcome the boiler's internal resistance. The flame spreader might be overheating as a result.

    Notice that on W-M's site, they list the Beckett AFG, Carlin EZ-1 and Riello burners for this boiler. All of these can produce more static air pressure than, say, a Beckett AF or Wayne MS-R burner.

    When we convert W-M Gold boilers to gas, we use Carlin burners- the EZ-Gas in the smaller sizes and the 201Gas for the larger ones. These can produce the static air pressure needed on the Gold boilers, so they run very nicely with no issues. I think changing the burner is probably the way to go for you.

    Of course you should also verify the BTU content of the gas you're using, and make sure the boiler is not over-fired. But I doubt that P250 will ever run well in your boiler.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • LPGasman
    LPGasman Member Posts: 18
    Btu content

    How do you verify the btu content?
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