Original message
| Jay Fuseblower
 |  "Wire a timer switch to furnace blower?"
, posted Thu 20 Mar 14:29  
Hi all - I'm a first time poster, so thanks for your patience.
I'm now running a corn/wood pellet stove to heat my home because the cost of running my forced air propane furnace was killing me. The stove heats the 2200 sq ft house better than the furnace ever did, by the way.
The blower on the pellet stove, in combination with a single ceiling fan in an adjacent room, circulate heat throughout the house surprisingly well, but it could be a little better.
The current thermostat for the propane furnace is two wire, "heat only" - there is no switch or controls for fan or A/C. I would like to try running the blower on the furnace to see if it helps circulate heat around the house even better. If it works well, I might hook the blower up to a timer switch rather than a thermostat, so it runs for some set period of time (so we'll just turn it to run for 10 minutes or so whenever we want).
Before I go through all the trouble of wiring up a timer switch, can I temporarily jumper some terminals on my furnace control board to get the blower to run, for a trial run or two? Just to see how well it works for me? I read online that the "G" terminal on the board controls the blower, and this corresponds to some of the labels on the schematic sheet pasted inside the metal case that houses the control board. But I don't know what to do with that terminal. I'm reading a nominal 24 volts across the "R" and "C" terminals with my DMM, but I don't know what to connect the "G" terminal to in order to switch the blower on.
Thanks for any advice about the issue I've described here.
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| "Re(1):Wire a timer switch to furnace blower?" , posted Thu 20 Mar 17:18
Hey there ole bud.
Jump R and G together to engage the blower. This is just what the thermostat would do mechanically, if you had a third wire for the fan.
What kind of thermostat do you have?
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