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    novice renovator's Avatar
    novice renovator Posts: 2, Reputation: 1
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    #1

    Jun 5, 2007, 07:30 PM
    3 wire thermostat exchange
    The old thermostat (round old dial) has 3 wire red, blue, white but the new honeywell RTH230B1006 is a single stage 5-2 unit and it has a lot of connections! Which go where? Or did I buy the wrong unit?:confused:

    OLD: Red, White and Blue
    NEW: Rh Rc W Y G

    I have both a gas furnace and central air. Please help! The other posts did not have the answers.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #2

    Jun 5, 2007, 08:06 PM
    Jumper wire between RC-RH and hook the red wire to one of them, White wire needs to go to the "W" terminal , and blue will go to the "Y" terminal, but you are missing a wire, you will need an extra wire for the fan, this is usually a green wire, and it will go to the "G" terminal.
    novice renovator's Avatar
    novice renovator Posts: 2, Reputation: 1
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    #3

    Jun 5, 2007, 10:54 PM
    Quote Originally Posted by novice renovator
    The old thermostat (round old dial) has 3 wire red, blue, white but the new honeywell RTH230B1006 is a single stage 5-2 unit and it has a lot of connections! which go where? Or did I buy the wrong unit?:confused:

    OLD: Red, White and Blue
    NEW: Rh Rc W Y G

    I have both a gas furnace and central air. Please help! The other posts did not have the answers.
    That info is extremely helpful, however "add an extra Fan wire?" how do I do this?
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
    Ultra Member
    		  
    #4

    Jun 6, 2007, 05:06 PM
    How many wires do you have coming from the wall? I doubt there are just three, in order for the blower on the furnace to engage the thermostat has to send 24 volts to the furnace through the "G" terminal.
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