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    veener's Avatar
    veener Posts: 3, Reputation: 1
    New Member
     
    #1

    May 14, 2011, 10:06 AM
    How to run just a furnace fan
    Hello, I am a new home owner and been doing a little research on my own to resolve this problem but thought I should ask the pros first. I have a 10 year old furnace with only 2 wires(R,W) running to my thermostat. I would like to get the cool air from my basement to the upper floor. My basement is finished and I cannot fish a new G wire without tearing into walls. Is it possible or safe to disconnect either R or W and use that wire to connect G to G? If not is there another option that safe and affordable. Thank you.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    May 15, 2011, 07:39 PM
    You can switch wires back an forth on your Thermostat to make the blower work. But after a few years it may start to do some ware and tare on your thermostat. If your furnace is easley accessible, add a blower switch at the furnace.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #3

    May 16, 2011, 06:02 PM

    There are thermostats available (like the Bryant T6) that can manage fully featured systems using only 2 wires between the display module and the equipment control module. These were designed specifically for situations like what you have (limited availability of control wires).
    veener's Avatar
    veener Posts: 3, Reputation: 1
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    #4

    May 18, 2011, 12:30 AM
    Quote Originally Posted by T-Top View Post
    You can switch wires back an forth on your Thermostat to make the blower work. But after a few years it may start to do some ware and tare on your thermostat. If your furnace is easley accessible, add a blower switch at the furnace.
    Thanks for the info, I have been looking around on how to safely run a switch. Would someone be able to explain it here? Please?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #5

    May 18, 2011, 03:39 AM

    Posting the brand/model# of the furnace would be helpful. One way to accomplish this: At the furnace, move the "W" wire to the "G" terminal. Turning the thermostat up will cause the furnace blower to run.
    veener's Avatar
    veener Posts: 3, Reputation: 1
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    #6

    May 20, 2011, 05:24 PM
    Thanks for everything, I simply switched the W to the G at the furnace. I only run the fan for a few hours a day so I don't burn out the fan motor. Thanks again.

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