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  1. #1
    Join Date
    Jun 2006
    Location
    SW MO.
    Posts
    5,212

    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?
    Discipline your child so that other parents don't have to.

    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
    5,212
    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.
    Discipline your child so that other parents don't have to.

    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
    9,748
    isolation relay for a power stealing thermostat.
    protects furnace controls from feedback from thermostat.

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