How does a modulating gas burner adjust the fuel mixture?

Discussion in 'HVAC Heating & Cooling' started by gypsydoctor, Jan 26, 2013.

  1. gypsydoctor

    gypsydoctor Retired Software Engineer

    Jan 25, 2013
    Retired Software Engineer
    Newton, MA
    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.
  2. BadgerBoilerMN

    BadgerBoilerMN Hydronic Heating Designer

    Mar 4, 2011
    hydronic heating designer/contractor
    A negative pressure gas valve with a computer controlled combustion blower, just like your car with a less dense fluid.
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