furnace blower

zendarx2 · 04-25-2009, 11:51 AM

Hello there
I looked though posts to see if I could find this information if its there rather than ask a question that’s been answered in the past. I couldn’t find anything so I’ll ask now.

I would like to get my furnace blower working without the heat. I’m sure the reason it’s not working is because of the thermocouple and how you don’t want the fan blowing if the fire blows out, it shuts down the whole thing. Well there’s no fire or gas so that’s not a problem. I just want the blower working with out heat. Any ideas as how to get this to work are very much welcome.

7900 series
Model 7956-856
Coleman direct vent (sealed combustion system) Forced air furnace. Equipped with standing pilot.

veesubotee · 04-25-2009, 12:48 PM

Quote:

Originally Posted by zendarx2

Hello there
I looked though posts to see if I could find this information if its there rather than ask a question that’s been answered in the past. I couldn’t find anything so I’ll ask now.

I would like to get my furnace blower working without the heat. I’m sure the reason it’s not working is because of the thermocouple and how you don’t want the fan blowing if the fire blows out, it shuts down the whole thing. Well there’s no fire or gas so that’s not a problem. I just want the blower working with out heat. Any ideas as how to get this to work are very much welcome.

7900 series
Model 7956-856
Coleman direct vent (sealed combustion system) Forced air furnace. Equipped with standing pilot.

The fan has nothing to do with your pilot (or visa-versa). While igniting your burners, its other job is to prevent gas flow in the event of an extinguished pilot.

Your thermostat should have a 'fan on' position, which can be selected. At the same time, you can turn the heat to the 'off' position. Previous describes older thermostats; newer ones controlled by pushing buttons.

V

**beenthere** · 04-25-2009, 01:03 PM

Need to have the stat conneced to the G terminal of the furnace.

zendarx2 · 04-26-2009, 08:25 AM

Quote:

Originally Posted by beenthere

Need to have the stat conneced to the G terminal of the furnace.

Thank you, I'll give that a try soon.

The only options on the thermostat are 50-90 degrees.

"The fan has nothing to do with your pilot (or visa-versa)"

So if it’s up and running in the winter and the fire is blown out the fan will still run?

**beenthere** · 04-26-2009, 08:28 AM

It will if you have the fan setting set to "on".

Most will bring the fan on automatically on a heat call. A few older ones won't.

zendarx2 · 04-26-2009, 12:03 PM

Well as long as the gas is shut off with a blow out then I guess I don't care if it stops blowing or not. Never had a blow out on any furnace but was told it all shut off in case of blow out.

I'll try the stat connected to the G terminal of the furnace being there's no "fan on" or anything else like that.

Thanks again

**beenthere** · 04-26-2009, 12:14 PM

What thermostat do you have

hvaclover · 04-26-2009, 03:10 PM

STANDING PILOT FURNACE MODELS
Below is a common parts list for the following furnace models:
7956C859, 7970C859, 7975C859, 7995C859 (Presidential, propane)
7956C856, 7970C856, 7975C856, 7995C856 (Presidential, natural gas)
7956B856, 7966B856, 7970B856, 7975B856, 7995B856 (Presidential, natural gas)
7956A856, 7966A856, 7970A856, 7975A856, 7995A856 (Presidential, natural gas)
7956-856, 7966-856, 7970-856, 7975-856, 7995-856 (Presidential, natural gas)

Must be an older mobile home furnace. Only reason a sealed combustion furnace would be a standing pilot

zendarx2 · 04-27-2009, 11:52 AM

Yes the model number is 7956-856,

hvaclover “Must be an older mobile home furnace. Only reason a sealed combustion furnace would be a standing pilot”

Not sure what this means for me. I’ve done some general maintenance on furnaces in the past but that’s about it. Any clarification would be helpful.

beenthere “What thermostat do you have”

All it says is “Coleman” there’s a sticker that explains that you can slide an “A-coil central air” part into it. Other than that the only markings on it are the temp setting.

hvaclover · 04-27-2009, 12:40 PM

Quote:

Originally Posted by zendarx2

Yes the model number is 7956-856,

hvaclover “Must be an older mobile home furnace. Only reason a sealed combustion furnace would be a standing pilot”

Not sure what this means for me. I’ve done some general maintenance on furnaces in the past but that’s about it. Any clarification would be helpful.

beenthere “What thermostat do you have”

All it says is “Coleman” there’s a sticker that explains that you can slide an “A-coil central air” part into it. Other than that the only markings on it are the temp setting.

What it means is that it's a furnace for mobile homes only. There should be a switch near where the burner peep hole is.

Does this A coil space on the furnace happen to be on the bottom of the furnace.

hvaclover · 04-27-2009, 12:41 PM

Quote:

Originally Posted by zendarx2

Yes the model number is 7956-856,

hvaclover “Must be an older mobile home furnace. Only reason a sealed combustion furnace would be a standing pilot”

Not sure what this means for me. I’ve done some general maintenance on furnaces in the past but that’s about it. Any clarification would be helpful.

beenthere “What thermostat do you have”

All it says is “Coleman” there’s a sticker that explains that you can slide an “A-coil central air” part into it. Other than that the only markings on it are the temp setting.

What it means is that it's a furnace for mobile homes only. There should be a switch near where the burner peep hole is. This should turn on the fan with out the heat being used.

Does this A coil space on the furnace happen to be on the bottom of the furnace.

veesubotee · 04-27-2009, 02:04 PM

Quote:

Originally Posted by zendarx2

Yes the model number is 7956-856,

All it says is “Coleman” there’s a sticker that explains that you can slide an “A-coil central air” part into it. Other than that the only markings on it are the temp setting.

Beenthere, better put in an emergency call for Twilli.

V

**beenthere** · 04-27-2009, 03:47 PM

We might have to. LOL

hvaclover · 04-27-2009, 04:26 PM

Quote:

Originally Posted by veesubotee

Beenthere, better put in an emergency call for Twilli.

V

Shhhheeee.. why call Twili. I got the specks on Coleman furnaces from the late 70s to the late 90s.

zendarx2 · 04-28-2009, 11:16 AM

I understand now thanks. I don’t see anything resembling a switch near the peephole. Just the pilot knob, there is the “on/off” switch in the middle but even with that left “on” the fan won’t turn on. If pictures will help I’ll take a few, is it possible to post them in this thread?