Old furnace fan control: thermostat tricks

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Old 10-08-18, 01:33 PM
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Old furnace fan control: thermostat tricks

I am looking for advice with my old ICG furnace, likely installed here in the late '80's. I recently purchased a home in a remote location in Northern British Columbia, Canada. The old original furnace had been disconnected from the gas supply, and the meter was removed. I have installed a pellet stove as the heat source for the home (1000 sq/ft) however I am using the furnace fan to move the heat from the basement to the rest of the home. So far it is working well! I would like to be able to have the furnace fan cycle, but because the burners on the furnace no longer work, there is an obvious disconnect between the pellet stove and the furnace fan. Does anyone know of a way to get the fan/furnace controls that operate the fan to pick up on the heat coming from the pellet stove and cycle the furnace fan? Any help would be well received. At this point I am using a fan in the living room to help move air around, and I shut off the furnace fan on the main electrical panel every nite before bed-time, and turn it on in the morning. Thanks in advance for replies.
 
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Old 10-08-18, 02:34 PM
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Welcome to the forums.

We'd need to know more about the furnace. Does it have a control board in it with an R and G terminal or maybe a fan center ? Pictures would help here..... How-to-insert-pictures
 
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Old 10-08-18, 07:09 PM
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Will try to load pics

Will try to upload pictures I took on iPad

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Last edited by PJmax; 10-11-18 at 07:20 PM. Reason: enlarged/labeled middle picture
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Old 10-08-18, 07:13 PM
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Even though gas line appears on left, it is dead-ended at the property line, main line (25 foot, approx) inside home has been removed. the colored lines to the left may lead to terminals inside, but i have not opened it to have a look
 
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Old 10-11-18, 06:59 PM
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Must have everyonr including me, stymied, but thanks anyway:-/
 
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Old 10-11-18, 07:23 PM
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The wires I circled are for the blower. That's how speeds are selected. The arrow is pointing to a fan/limit controller. That control turns the blower on when the plenum is heated. It is also wired as a high heat safety device.

With the blower wires going into that box..... it looks like there may be a relay in there.
Have you pulled the blower door off and checked the back of it for a wiring diagram ?
 
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Old 10-13-18, 08:06 AM
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I believe there is a set of schematic drawings in an envelope stuck to the side of the furnace, I will look, take a photo, and post it, thanks again!
 
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Old 10-18-18, 05:15 PM
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Found the schematics for "Typical" "Honeywell" and I have marked the furnace model # above, hope this helps
 
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Old 10-18-18, 10:13 PM
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I labeled one of your pictures with a yellow arrow. That is a fan/limit control. It's based on furnace heat to control the blower. In the diagram.... the yellow arrow is pointing to the same item. There will be four wires in there. The incoming hot is black and is connected to two points. The outgoing color circled in red is the blower line. A direct short between the two red circles will run the blower. You put a switch in at the furnace for manual blower or some type of remote switching. Let me know.

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