Honeywell THP9045A - Step 4 Select Wire Configuration; Matching System to Wire Combinations

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Step 4 Select a wire configuration
Examine the labels on the terminal block for the existing thermostat wires.
Determine which of the following combinations matches your setup:
a. Single stage system (1 heat and 1 cooling stage) uses wires R or Rc, Y, G, W
b. Two stage heat, single stage cooling system uses wires R or Rc, Y, G, W, W2
c. Two stages for each heating and cooling uses wires R or Rc, Y, Y2 G, W, W2
If none of these combinations matches what you see, call customer service for further
instructions.