I'm looking to install a heat exchanger in my pole barn furnace plenum, also where my Garn Jr. is, and I'm looking to get the furnace to only run the fan on a call for heat. Now, I don't have gas hooked up to the furnace, so when I tie the thermostat wires together and flip the switch, my pilot tries to light the gas (funny, it tries to work like a furnace should...). From my understanding, the furnace is waiting for the gas flame to get up to temp before it kicks on the fan.
How do I circumvent this? I'm hoping to be able to get a programmable thermostat to keep the pole barn just above freezing or schedule to get up to heat by the time I plan to use it. Of course, I can run the blower wires directly to the switch, but this takes away my ability to use a thermostat to control the fan!
Heaterman provided the instruction and diagram for making this work on my house furnace, so I'm wondering if that will help? I've attached this, and also attached is a picture of my control board on the pole barn furnace. I've been harassing him enough, so I'm hoping to see if there is a quick way to accomplish this that others have experienced before.
![Heat exchanger in furnace - Fan only to run on call for heat Heat exchanger in furnace - Fan only to run on call for heat](https://www.hearth.com/talk/data/attachments/149/149061-e95dbcbfab7cfe35ab92bf9e97ea6a69.jpg)
What do I need to make this work? The furnace is an older Bryant and I can't for the life of me find a model number.
Thanks for your help!
How do I circumvent this? I'm hoping to be able to get a programmable thermostat to keep the pole barn just above freezing or schedule to get up to heat by the time I plan to use it. Of course, I can run the blower wires directly to the switch, but this takes away my ability to use a thermostat to control the fan!
Heaterman provided the instruction and diagram for making this work on my house furnace, so I'm wondering if that will help? I've attached this, and also attached is a picture of my control board on the pole barn furnace. I've been harassing him enough, so I'm hoping to see if there is a quick way to accomplish this that others have experienced before.
![Heat exchanger in furnace - Fan only to run on call for heat Heat exchanger in furnace - Fan only to run on call for heat](https://www.hearth.com/talk/data/attachments/149/149060-b645a90862d70eac548e8c1c72c4c0a2.jpg)
![Heat exchanger in furnace - Fan only to run on call for heat Heat exchanger in furnace - Fan only to run on call for heat](https://www.hearth.com/talk/data/attachments/149/149061-e95dbcbfab7cfe35ab92bf9e97ea6a69.jpg)
What do I need to make this work? The furnace is an older Bryant and I can't for the life of me find a model number.
Thanks for your help!