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Thread: Honeywell T87 to Nest wiring issue

  1. #1
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    Honeywell T87 to Nest wiring issue

    I am looking to upgrade to a Nest from a Honeywell T87. I have seen that it is compatible, but everything I read about 2 wires says that they are "red" and "white" My concern is that my 2 wires are white and black. Do I assume that my black wire would be "red" for installation purposes?



  2. #2
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    Quote Originally Posted by MAW65 View Post
    I am looking to upgrade to a Nest from a Honeywell T87. I have seen that it is compatible, but everything I read about 2 wires says that they are "red" and "white" My concern is that my 2 wires are white and black. Do I assume that my black wire would be "red" for installation purposes?
    My simple technique was to write down the wire colors, then go to the furnace, etc where the terminal strip had the "letters" that I needed for connecting. I basically ignored the wire colors after that and referred to the letters for hooking up to the Nest. Hope that helps, as wire color is not that important other that to tell the conductors apart.

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