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stillchildfree asked How to adjust an older Lennox Furnace?
I have a Lennox Gas Furnace that is 46 years old. I just replaced the Fan limit switch, but the blower is coming on after the flames have gone out and stays on for 5 minutes. How do I adjust the limit controls? There is one slide bar that goes from 70 to 130 degrees, and one turn wheel that says Differental. Any help would be great.
And got the following answer:
The part is supposed to be pretty close coming right out the box. You want the setting to be around 100 degrees and then tweak it from there. The way it works is pretty simple. Your burner comes on and the heater warms up. When the temp is around 100 degrees the fan will kick on and warm air will come out the vents. When the temp is good and the thermostat is satisfied the gas goes off but the fan keeps going till the heater cools and the fan switch bi-metal is cooled down. From what you are describing the fan switch is set way too high and making the high limit shut down the heat chamber. Try setting it on 90 degrees and if the air is too cold coming out the vents then bump it up. It all depends on where you live really and that's why it is set-able in the first place.