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    chrismiss23's Avatar
    chrismiss23 Posts: 1, Reputation: 1
    New Member
     
    #1

    Oct 1, 2012, 07:43 PM
    4-Wire thermostat installation. Red, White, Blue, Green
    I am installing a Lux TX9000TS digital thermostat. The wires I have are Red, White, Blue & Green. On the Thermostat I have W, Y, G, B, O, RH RC (Jumper) & C. My question is where does the Blue wire go? My father in law put it on the B, but when the furnace kicks on, the AC fan also kicks on. I have a Bryant Plus 90 Gas Furnace and an old Central AC unit (don't know the name). From what I've read, the Blue is either going to go to C or Y, but which one is it? Thanks!
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Oct 2, 2012, 11:52 AM
    Red to R
    White to W
    Green to G
    Blue to Y
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
     
    #3

    Oct 2, 2012, 03:14 PM
    wmproop nailed it. Long time no see wmproop. How you been?
    silver300's Avatar
    silver300 Posts: 1, Reputation: 1
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    #4

    Apr 20, 2013, 09:16 AM
    Old wiring is blue,red,green and white,rh and rc wire is black.What matches what
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
     
    #5

    Apr 20, 2013, 01:12 PM
    It really depends on how things are wired at the furnace. But the standard is red to rh with a jumper between rh and rc, white to w, green to g, blue to y. However, if you have a black to rh-rc, you need to look in the furnace and let us know were wires are hooked.
    ron_f's Avatar
    ron_f Posts: 1, Reputation: 1
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    #6

    Oct 25, 2017, 01:01 PM
    Blue could also connect to C. Blue is 24 VAC Common wire.

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