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    mam209's Avatar
    mam209 Posts: 4, Reputation: 1
    New Member
     
    #1

    Mar 29, 2009, 05:38 PM
    Changing original Bryant thermostat to Honeywell programmable
    First, I really want to express thanks for all the expert answers that helped on my last question. You guys rock! The advice worked like a charm! I tried replacing the thermostat before cleaning the flame sensor and now the A/C is not working!! The wiring on the old stat is R,B,W,Y,G and the new Honeywell is Rh,Rc,W,Y,G. I connected the obvious ones and then the R to th Rh terminal and the B to the Rc terminal. The furnace works great( now that the flame sensor is clean ) but I cannot get the A/C to work. I have the same question in with the Honeywell people, but have not gotten an answer yet. Plus I wanted to compare what you guys say to check for their accuracy! Any help is once again greatly appreciated!
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #2

    Mar 29, 2009, 06:59 PM

    If you don't have a heat pump it sounds like you may be using the
    B wire in the wrong place. I really don't know what the B wire goes to, so I will tell you how I think it should be wired.

    R to Rh

    W to W

    G to G

    Y to Y

    Then if you do not already have a jumper from Rh to Rc you need to add one.

    Since I don't know what the B wire does I don't know what to tell you to do with it. It could just be an extra. But I don't think it goes to the Rc terminal.

    Look at the low voltage strip in the furnace and see what the B wire goes to and let me know. Then maybe I can tell you.
    mam209's Avatar
    mam209 Posts: 4, Reputation: 1
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    #3

    Mar 30, 2009, 04:21 PM
    Thanks letmetellu! I traced the blue wire and it is a dummy like me! Your answer was perfect! Identical to Honeywell's as well! Many thanks for the expert advice! Everything works great!

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