Thermostat Wiring Blue 4M

Discussion in 'HVAC' started by TxBuilder, Oct 12, 2009.

  1. Oct 12, 2009 #1
    I am trying to replace my old style thermostat with a new Honeywell.

    My old wiring setup:

    Green to G-F
    Yellow to Y-C
    Red to R-V
    White to W-H
    Blue to 4-M

    That is the labeling on my old thermostat.

    My new thermostat has the follow labels:

    W Y G R Rc

    There is currently a jumper for R and Rc they say to remove if you use Rc.

    Both heat and HVAC are electric. No heat pump as far as I know.

    So where does the Blue wire go? Rc?

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