Question about Honeywell Programmable Thermostat Heater

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I have a blue wire on the old thermostat. do i need to connect it to the new thermostat? if so where?

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  • smegahey Jun 21, 2009

    i have ac and it was at the "B" terminal which i dont have on the new t-stat

  • smegahey Jun 21, 2009

    the old t-stat the i have green red and blue hooked up the new t-stat i have rh rc (which are jumped) w y g

  • smegahey Jun 22, 2009

    i also found i have a white wire where does it go?

  • smegahey Jun 22, 2009

    sorry i didny have a white wire i have red blue grren and yellow

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On a 4 wire system - red, white, blue, green, treat blue as if it were yellow

Posted on Jun 21, 2009

  • Jim Thurston Jun 21, 2009

    red to rc, blue to yellow, green to green

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Depends if you have ac.where was it on the old stat

Posted on Jun 21, 2009

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1 Answer

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Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

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