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Country Discussion Topics
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Need a wood stove guru
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Dave    Posted 01-02-2004 at 18:48:44       [Reply]  [Send Email]
I have an outside woodburning furnace (old). I want to figure out an inexpensive way to make the fan run when the firebox gets hot. It has a circuit board that shorted out and the last one I could find was $100. Any ideas or suggestions would be appreciated. Thanks

Rowdy Yates    Posted 01-04-2004 at 03:02:20       [Reply]  [Send Email]
What Jack is talking about is a "Fan/Limit Control". It turns the fan on when it gets warm enough and on a gas fired furnace it also acts as a safety by turning off the gas if it would happen to get too hot. These would be the simplest/cheapest way to fix your furnace, as was already said, if you can find a furnace repairman they probably have all sorts of "used" ones around. There are long ones and shrt ones, depending on the application. This device could also be used with an indoor thermostat to automatically turn the fan on when the house gets cold, just like a gas fired furnace, you would just need to have a low voltage transformer and a contactor in order to do that. Otherwise the Fan/Limit switch will work great alone if you want the fan to run the whole time the furnace is hot. They are also adjustable. Any heating and cooling serviceman should be able to show you how to do that easily. Been doin' it for 25 years myself.

Ron/PA    Posted 01-03-2004 at 04:07:42       [Reply]  [No Email]
Dave, go to your heating supply house and get yourself a "surface mount aquastat" make sure you get one with High and Low limits and you can set that puppy to come on when it gets warm, and shut off when it gets cool.
You can mount it to the firebox, or the stack play with it for a few hours and it'll work just like a thermostat, then you can over ride with a thermostat, or switch in the house.
I've installed dozens this way and they are wayyy cheaper than the circuitry from OEM.
Good luck

Bob    Posted 01-02-2004 at 20:01:45       [Reply]  [No Email]

Bob    Posted 01-02-2004 at 20:03:31       [Reply]  [No Email]
P.S. ... OOOPS... missed one site

deadcarp-puzzled    Posted 01-02-2004 at 19:51:43       [Reply]  [No Email]
why would you want a fan running when the firebox gets hot? surely a hot firebox doesn't need more air ------ or do you mean to circulate the heat? if so, why not just setup a house thermostat to switch it and tend the fire according to heat needed? you don't always want heat when the stove's ready for it, but rather when the house needs some.

Jack    Posted 01-02-2004 at 19:38:53       [Reply]  [No Email]
If the stove has a plenum, try one of those curled metal switches that sticks into the plemum from an outside 4" by 8" gray box. You can control the temperature setting inside the box. Not sure what you call the aparatus but they cost about $30.00. Way it works is the curled metal expands around a central metal finger when it gets hot and a fan turns on for forced air to your register and cuts off at the lower setting. Damned if I can't think of what they are called. Works swell and should be able to pick one up at an old furnace shop still stuck to a plenum.

TB    Posted 01-02-2004 at 19:44:40       [Reply]  [No Email]
Thats kind of what I was thinking A plenum limit switch out of a furnace before thay had all this electronic stuff. One that is adjustable would be really nice.

Jack    Posted 01-02-2004 at 19:58:19       [Reply]  [No Email]
That's it, limit switch. Wouldn't be hard to build a plenum around the furnace either. They usually are double walled anyway. In Fact I would include part of the stove pipe in the plenum.

TB    Posted 01-02-2004 at 20:04:35       [Reply]  [No Email]
I am thinking it allready has a plenum, becouse he said furnace not wood stove

Dave    Posted 01-03-2004 at 07:27:43       [Reply]  [Send Email]
Thanks for the suggestions, I should be able to find something that will get me going.

TB    Posted 01-03-2004 at 07:38:24       [Reply]  [No Email]
Your welcome. Ron/Pa works on furnaces regularly so he should know what he is talking about.

Grove r    Posted 01-02-2004 at 19:29:06       [Reply]  [No Email]
Just a thought...would an ordinary mercuy switch on a thermostat??

The need to keep the "home fires burning" tonite is quite obvious when one observes the thermometer...minus twenty six and sliding..... weather guesers say Minus thirty and then some tonite....all readings in C.....good nite to take someone out "snipe hunting".....have a gooder, R.E.L.

TB    Posted 01-02-2004 at 19:22:52       [Reply]  [No Email]
I'm sure thair will be other ideas. But I am thinking the controles out of an old Hot air oil furnice could be made to work. maybe?

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