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These are all described in the ecobee documentation Learn how to properly wire a 3 wire honeywell thermostat for heating and cooling systems Use your wires for r, w, and c

You will no longer have independent fan control The wiring diagram will show the two hot leads, c (common) and r (red or 24vac). This is a supported solution.

By following this diagram, you can easily identify the correct terminals for each wire and make the necessary connections.

When installing a heat only thermostat, you’ll need three wires to connect it to your furnace

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