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  1. #1
    Join Date
    Jun 2006
    Location
    SW MO.
    Posts
    5,063

    This makes no sense.

    Theres no need for a relay on the W circuit. If the wire was broken from the tstat then the relay wouldn't work either. If the W circuit was bad on the board then the relay wouldn't matter. Why ? Why? Why?
    I repair air conditioners to keep people cool when it's 110+ degrees outside.
    I repair heaters so people don't freeze to death.
    I shut down furnaces that are unsafe to operate.
    Make fun of my profession, but dang it, I save lives.

    We're awl pawthetic and kweepy and can't get giwrls. That's why we fight wobots.

  2. #2
    Join Date
    Jun 2006
    Location
    SW MO.
    Posts
    5,063
    Nevermind. Just hit me. They're using the W circuit as a Common to power the Chronotherm tstat. Guess it runs on batteries in heat mode.
    I repair air conditioners to keep people cool when it's 110+ degrees outside.
    I repair heaters so people don't freeze to death.
    I shut down furnaces that are unsafe to operate.
    Make fun of my profession, but dang it, I save lives.

    We're awl pawthetic and kweepy and can't get giwrls. That's why we fight wobots.

  3. #3
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,642
    isolation relay for a power stealing thermostat.
    protects furnace controls from feedback from thermostat.

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