X or Aux-Wire - connects to X terminal and is for auxiliary.E-Wire - connects to E terminal and is for Emergency heat.O or B-Wire - connects to O or B terminal and is for reversing valve operation.C-Wire - connects to C terminal (common 24v power) with the C wire.G-Wire - connects to G terminal and for fan operation with the green wire.W2-Wire - connects to W2 terminal and for heat stage 2.W-Wire - connects to W terminal and for heat stage 1 with the white wire.Y2-Wire - connects to Y2 terminal and is for cooling stage 2.Y-Wire - connects to the Y terminal and is for cooling stage 1 with the yellow wire.RH-Wire - connects to RH terminal RH heat.RC-Wire - connects to the RC terminal RC red.Red-Wire - connects to the R terminal with the red wire. Thermostat Terminal Designations Quick Guide - Detail Wiring Color Guide Below.Essential Thermostat Wiring Color Guide Including Manufacturers Instructions. Thermostat Wiring Colors Code Page Navigation
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