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.
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