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Tool Talk Discussion Forum

ideal flame in an old gas furnace?

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circus

01-26-2008 21:51:53




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Only I would dismantle a working furnace when it's -15 out. Just cleaned and inspected my old fashion gas furnace (G12 Lennox). A lot of burner air gives a bright blue flame that's tight to the burner. A little burner air gives a lazy bright blue flame topped with dark blue streaked with yellow. I assumed the correct flame would have about a � " bright blue flame with dark blue just barely having no yellow. What is the ideal flame in an old gas furnace?

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RusselAZ

01-27-2008 17:16:28




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 Re: ideal flame in an old gas furnace? in reply to circus, 01-26-2008 21:51:53  
Any yellow is to much. Yellow is what soots up the combustion chamber.

Plus, yellow is a waste of fuel.



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msb

01-27-2008 12:49:07




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 Re: ideal flame in an old gas furnace? in reply to circus, 01-26-2008 21:51:53  
Electric blue-no yellow at all.



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guido

01-27-2008 06:50:14




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 Rg: ideal flame in an old gas furnace? in reply to circus, 01-26-2008 21:51:53  
Hey Circus.
You did it wright. I agree with dcotton4.
Just a hint of yellow is O.K. clear blue flame with no yellow is better.
Guido.



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dcotton4

01-27-2008 05:43:35




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 Re: ideal flame in an old gas furnace? in reply to circus, 01-26-2008 21:51:53  
You are correct that you want to adjust the air so that there may be just a hint of yellow on the very tips of the flame but mostly blue and that there is enough air to just lift the flame off of the burner a bit. To much air will make the flame dance above the burner.Also if the air is properly adjusted you should have a nice ignition and not a boom when it lights. Dave



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