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    jdburwelljr's Avatar
    jdburwelljr Posts: 3, Reputation: 1
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    #1

    May 17, 2009, 10:19 AM
    Honeywell RTH221 thermostat installation wiring
    I just installed a Honeywell RTH221 Thermostat. The old one had a red, green, yellow, and black wires. I installed the black one to the yellow connection. Now the unit runs backwards... heat instead of cooling... cooling instead heating. How should I have connected the wires?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    May 17, 2009, 11:03 AM

    R to red, black to w, green to g, yellow to y. try this and let me know if it works. If not, I will need to know what color wires are hooked to the terminals on the furnace.
    jdburwelljr's Avatar
    jdburwelljr Posts: 3, Reputation: 1
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    #3

    May 17, 2009, 12:16 PM
    I ended up connecting black to yellow, red to red, green to green, and yellow to white. Now everything is working correctly.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
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    #4

    May 17, 2009, 01:09 PM

    Glad you got it going. Good job.
    jdburwelljr's Avatar
    jdburwelljr Posts: 3, Reputation: 1
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    #5

    May 17, 2009, 01:14 PM

    Thanks! I am not sure how I figured it out.
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