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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22627
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I have installed an outdoor furnace and I need to hook up a

Customer Question

Customer: I have installed an outdoor wood furnace and I need to hook up a thermostat to just rum my blower on my Carrier Furnace. Any idea how I would go about that?
JA: Thanks. Can you give me any more details about your issue?
Customer: I just need the blower on the furnace to run to circulate the heat produced from the outside wood furnace. Right now I have to physically go to the original thermostat and turn on the blower when we need heat. I want to add an additional thermostat that will activate the blower only.
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Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.


in the furnace you will attach 2 thermostat wires to R and G.

Then in the thermostat you choose to use you will wire the R wire to R....and the other wire to W.

So the R wire attaches to R at both ends...but the other attaches to W in thermostat and G in furnace.

Customer: replied 1 year ago.
My furnace doesn't have R G or any other Letters. It has numbers 1234 please see pictures that are attached
Expert:  BillyHvac replied 1 year ago.

bottom right side labeled noncommunicating thermostat

Expert:  BillyHvac replied 1 year ago.

I see G will be utilized a different way...can you tell me the model number of the furnace please?

Customer: replied 1 year ago.
It's a Bryant not a Carrier sorry. Model FE4ANF005
Expert:  BillyHvac replied 1 year ago.

there is a chance that this is a air handler not capable of standard fan switch. If this is a 100% communicating system we may have an issue...the abcd, 1234 type wiring is data...not a 24v communication system.

Ok got model number and will check...just a moment

Expert:  BillyHvac replied 1 year ago.

ok, do you mind a hands on test?

Customer: replied 1 year ago.
What do you need me to do?
Expert:  BillyHvac replied 1 year ago.

your unit is set up for communication data.

But I want to see if the standard r, y, c, w etc will engage a blower relay. On your board...not the there a G in the line of R,Y,W,O,C?

Customer: replied 1 year ago.
Expert:  BillyHvac replied 1 year ago.

well this one stumped me.

the system you have is communicating which means all heat, cool, fan, humidity is through your infinity wall control. This is not standard 24v.

Some systems are a hybrid...capable of either...yours is not. I have never added a secondary noncommunicating thermostat to a communicating system. I have done tons of wood burners and controls.....but not a fan control for wood burner on a communicating system. I will opt out and see if anyone has an idea without messing with the communication system