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    tomroth's Avatar
    tomroth Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 27, 2011, 07:24 PM
    Furnace thermostat operation
    Hi all! I'm sort of an electronic and computer nerd. I'm trying to figure out how the furnace thermostat actually works. I know the color codes, Rc & Rh are red (24vac), W is white (heating call), Y is yellow (cooling call), and G is green (fan). My question is, if I take the red (24vac) and connect it directly to, say G (fan), will the fan start? Same for Y and W, would they start also. I'm designing my own zoned system and need to know how to set up my relays. Don't worry, nobody is responsible for anything I may do wrong!

    Thanks!
    WallyHelps's Avatar
    WallyHelps Posts: 1,018, Reputation: 136
    Ultra Member
    		  
    #2

    Nov 28, 2011, 06:45 AM
    I believe you are correct Tom.
    Here is a diagram that seems to indicate what you are describing. There also might be some useful info on that website.

    Best of luck!
    WallyH
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #3

    Nov 28, 2011, 06:00 PM
    , if I take the red (24vac) and connect it directly to, say G (fan), will the fan start?(yes)

    Same for Y and W, would they start also. (yes/yes)

    But only one at a time,as you move the red wire to each wire
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #4

    Nov 28, 2011, 06:29 PM
    Sounds like you have a good handle on this. The red wire is the 24v wire. The thermostat simply lets the 24v go to w, y, g depending on what the stat is calling for.
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