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I have a separate unit for ac then I do for heater

I have a separate unit for ac then I do for heater I'm trying to install a new Honeywell in from the old intertherm both are electric the problem is I have 4 wires connected on my old one they are the R,Y,W and A what is the A wire for help please

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My guess is antocipator... not used on new thermostats.

Posted on Nov 26, 2014

  • 1 more comment 
  • david walter Nov 26, 2014

    What is the antociptor

  • david walter Nov 26, 2014

    I can't send a pic but all it shows is GYWR going to its location 9n the thermostat that's it

  • david walter Nov 26, 2014

    I tried searching up what it was or what all the wires meant and we're used for and nothing I seemed mentioned anything about the A wire

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