Nortron Furnace

sdavidson · #1 (**permalink**) 08-29-2005, 08:39 AM

Hey guys, I got a norton furnace, and I got a wicked problem, the fan will not turn off ? it doesn't matter what I set it too, there is a 2 wire control going to the furnance, one of course connecte to Power (R) and the other connected to Heat (W1) but I can't get it to auto shut off when it hits any temp? I think it may be the relay's but I wanted a second opinion ?

Thanks

LazyPup · #2 (**permalink**) 08-29-2005, 08:49 AM

Pull the front service access cover off your furnace and you should find a wiring schematic glued on the inside of the cover.

If you have a two wire thermostat it is most likely only controling the burner and the fan is being separately controlled by a heat sensing thermostate in the plenum.

lonestarheir · #3 (**permalink**) 08-29-2005, 09:19 AM

You could have a fan relay that is stuck in the closed position

__________________________________________________

Brandon
- Have you changed your filter this month? -

sdavidson · #4 (**permalink**) 08-29-2005, 09:46 AM

Ahh, ok I will go home and see that on my lunch, I have changed the filter.. I always do...

sdavidson · #5 (**permalink**) 08-29-2005, 04:20 PM

ok, I took a look on cover, and it is gone, i guess whom ever owned it removed it for some reason.. I will give you a web link, hopefully somone can help me out.. remember the reason why I am asking is that my 2 wire furnace, the fan will not shut off.. when it is on.. I turned the breaker off for now, since it runs constant...

Thanks

This the link for the pic
http://homepage.mac.com/steve.davidson/PhotoAlbum6.html

I noticed that the blue wireing coming off of the large transformer in the middle is not connected...

thanks again

Mike3 · #6 (**permalink**) 08-29-2005, 10:31 PM

If you have a standard fan control (not a fan timer board) the off temp may be set to low, causing the ambient heat to close switch.

LazyPup · #7 (**permalink**) 08-29-2005, 11:28 PM

i have examined the photo and I think i will be able to make you a schematic for this unit but I need to know what the red writing on the housing beside the second relay says.

Check the label on the transformer..That appears to be a 110v/220v primary transformer. The red wire is used for 220v primary and the unused blue wire would be used in place of the red for a 110v primary voltage supply.