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150000 1974 national gas forced air furnance does the fan come on the same time the gas comes on. model no. g-u 313150-16m

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  • wildbillcurr Nov 16, 2008

    thank you for the comments.  i see a spring and will try to fix my furnace with the advice i got from this site, thank you

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Not familiar with that particular model but on virtually every type and style of furnace i have worked on in the last 21 years. the fan is delayed. usually the burner lights then 3 to 5 minutes later after the heat exchanger has gotten nice and hot the fan comes on and blows nice and hot air. on old furnaces there was and is a switch usually on the upper right side of the furnace bulkhead that has a spring like device that heats up and rotates till it makes a set of contacts that turn the fan on. if it gets to hot the set of contacts breaks the power to the gas valve and shuts down the burner. as the furnace cools down on shut off there is a third set of contacts that open to turn off the fan so you don't get a draft. sometimes the stat can be wired up wrong, and it will bring the fan on right away ,and air will be cool and drafty till furnace catches up.

Posted on Nov 13, 2008

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