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    sgia's Avatar
    sgia Posts: 8, Reputation: 1
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    #1

    Apr 25, 2009, 03:49 PM
    Installing Honeywell Thermostat
    I'm installing new thermostat - all wires/lettering corresponds from old to new with the exception of new one has a slot for "w"but I have two wires left "w1" and "w2". "W1" is tan and "w2" is yellow. Thanks for the help!
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    #2

    Apr 25, 2009, 04:01 PM

    Do you have a heat pump? Or gas heat?
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    #3

    Apr 25, 2009, 04:04 PM
    Neither - both ac and heat are electric - house built in 70's
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    #4

    Apr 25, 2009, 04:08 PM

    OK do you still have the package your new stat came in? If so tell me what it says, like does it say 2 heat 2 cool or single stage heat plus cool.
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    #5

    Apr 25, 2009, 04:09 PM
    You may need to get a 2 heat t-stat, or put both wires on w
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    #6

    Apr 25, 2009, 04:13 PM
    It's model rth600d - which is not on honeywell wesite for some reason - it says compatible with heating and cooling systems - not compatible with electric baseboard heat or heat pumps - doesn't exactly state what you are asking. New one has slots for 4 wires - I have 5 wires.
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    #7

    Apr 25, 2009, 04:15 PM

    OK tell me what colors you have, and where you have put them..
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    #8

    Apr 25, 2009, 04:22 PM
    Green - g: red - r: blue - y
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    #9

    Apr 25, 2009, 04:26 PM

    Does your outdoor unit run during heating and cooling or just cooling?
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    #10

    Apr 25, 2009, 04:28 PM
    Just cooling
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    #11

    Apr 25, 2009, 04:31 PM

    OK if it runs in just cooling then you have 2 options. You can take the t-stat back and get one for 2 heat. Or you can keep that one and put both wires under the w terminal. Your old t-stat was wired so that your heat would come on in stages
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    sgia Posts: 8, Reputation: 1
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    #12

    Apr 25, 2009, 04:31 PM
    Fyi - it's a rth 6400d not 600 - I typed it wrong - sorry!
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    #13

    Apr 25, 2009, 04:32 PM
    Thank you so much! I'll let you know if this soccer mom did it!
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    #14

    Apr 25, 2009, 04:58 PM
    So far so good - nothing exploded nor caught fire - ha!ha! Thanks again!
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