Furnace turnoff just before the blower go on.
You are to be commended for noticing this sequencing of events-- Good observation!
You need to adjust the Plenum control switch. (Or fan control switch)
Usually at the top front of the furnace, is a Fan control switch--
It is called the Plenum switch-- and it senses the temperature of the Air being heated by the fuel--
(Is your furnace Oil or gas?-- if Gas-- is it LP or Natural?)
This switch Has a cover that can be removed-- inside is a round dial, with some adjusting screw, and Degrees stamped on the perimeter of this round dial.
You can take the cover off, while the furnace is running-- (Just do not touch the screw terminals that have electric power to them--
You can rotate this dial, and it will turn the fan on-- (Or if the trip levers are mis-adjusted-- it might shut off the burner-- just rotate back the other way, and it will re-light etc.--
The purpose of this control is to make sure your fan is not blowing COLD air.
So-- lower the 'ON' switch tripper, down lower, so the fan will turn on sooner.
You may have to loosen a set-screw-- but usually they are just friction held-- and can be forced to slide (rotating CCW) to the lower temperature setting.
(If you get it too low, it will be blowing cooler air than you like at the registers.)
However-- to get the most heat from your furnace energy source-- you want the fan to come on as early as you can tolerate-- That will be delivering HEAT to your occupied space sooner, and giving yo more of those dollars you are spending on fuel, in the orm of heat in your house!
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Dec 28, 2010 |
Heating & Cooling