I really need this answer for my homework. Please help.
2007-09-23 16:17:09 · 7 answers · asked by joshthebowhunter 1 in Home & Garden ➔ Maintenance & Repairs
so it does not blow cold air through the vents...it has a sensor that detects the temp of the firebox and when it reaches a preset temperature it turns the fan on and when fire stops it turns fan off when it lowers the temperature to a preset temp....on some units this is done with an electronic timer that just delays the fan for a few minutes until a preset amount of time has passed...usually about 1 minute...then when fire goes out the fan will stay on usually about 11/2 minutes to cool firebox
2007-09-23 16:45:48 · answer #1 · answered by Anonymous · 2⤊ 0⤋
Well, I was gonna answer this, but the answers you got here are far better than mine! :D
Maybe I'll answer anyway... The reason for the delay is so you don't get a blast of cold air! It waits till the heater gets hot inside, then the fan kicks on by a temperature switch. Also, when the flame goes out, the blower will continue to run till the heater cools off inside, and so as to not waste the heat therein.
How'd I dooh?
~Cindy Brady Tooh! :D
2007-09-24 00:14:13 · answer #2 · answered by ♛ CindyBradyTooh ♛ 7 · 1⤊ 0⤋
it takes a small period of time to heat the firebox up, that is what the fan blows air across to send heat into the home. On those same lines that's why the fan runs after the burner shuts off, it runs till the firebox cools off to get the most out of the heating cycle
2007-09-23 23:25:48 · answer #3 · answered by frfiter 3 · 1⤊ 0⤋
Because it's got to heat the plenum.
(a hollow tubing enclosure) that needs to get warm before a temp. switch kicks on to turn the fan on.
2007-09-23 23:25:48 · answer #4 · answered by fuzzykitty 6 · 1⤊ 0⤋
well how it works is that the furnace has a sensor in it called a vane switch. the vane switch has to register that air is being passed across it from bringing air in from the outside in order to kick the blower on and send the heat through your house. if the furnace did not have this safety feature you could fill ur house with gas, carbon monoxide, through your duct work. so instead it will not allow the furnace to blow until the pilot is lit and the air is across the vane switch. hopefully this helps you out.
2007-09-24 00:07:47 · answer #5 · answered by sparky 1 · 0⤊ 4⤋
needs to reach a certain temp bebore it turns on
kinda like how an electric oven regulates temp by turning on and off
2007-09-24 05:09:17 · answer #6 · answered by Gary B 3 · 0⤊ 0⤋
if the fan started right away it would blow cold air, it's on a timer so the heat exchanger has enough time to heat up so it will blow warm air
2007-09-24 11:49:15 · answer #7 · answered by Daniel S 3 · 0⤊ 0⤋