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    buford's Avatar
    buford Posts: 1, Reputation: 1
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    #1

    Nov 17, 2008, 12:53 PM
    How to Change thermostat from 2wire to 3 wire for Fan and Heat
    How to Change From A 2 wire thermostat to a 3 wire So I can Have fan only when needed
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
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    #2

    Nov 17, 2008, 06:28 PM

    Since you didn't bother to offer up any info:

    Do you at least 3 stat wires coming from the wall? If not then you will have to pull more stat wire.

    Does your current stat have a "G" terminal?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #3

    Nov 17, 2008, 06:32 PM
    Quote Originally Posted by buford View Post
    How to Change From A 2 wire thermostat to a 3 wire So i can Have fan only when needed


    Run yourself another tstat wire,from furnace to tstat
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #4

    Nov 17, 2008, 08:14 PM

    If your furnace is not desinged to accommodate Air Conditioning here one suggestion.

    Have a thermostat that has a fan on and auto positions. Have three wires running from the furnace to the thermostat, and you will have to have a relay that the thermostat operates to turn on the fan motor.
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