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Thread: How does a modulating gas burner adjust the fuel mixture?

  1. #1
    Retired Software Engineer gypsydoctor's Avatar
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    Jan 2013
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    Default How does a modulating gas burner adjust the fuel mixture?

    My new Burnham Alpine gas boiler uses a variable speed blower to modulate the flame output down to 1% increments. How does it adjust the gas flow to keep the proper fuel/air mixture at all flow rates?

    An old car does this with a carburetor. A new car has a mass air flow detector feeding a computer which meters the fuel injectors.
    Mark Dionne
    Retired software engineer

  2. #2
    Master Hot Water Mpls,MN BadgerBoilerMN's Avatar
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    Default

    A negative pressure gas valve with a computer controlled combustion blower, just like your car with a less dense fluid.

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