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Q My old thermostat has two wires, but the installation instructions for my Rite Temp thermostat show only a three- wire installation.

A On a two wire low voltage heat only system connect to the Rh and the w terminals. The "C" (common) wire is optional, and is not needed to run the thermostat. If you have the "C" wire, connect it to the "C" terminal, and it will extend the thermostat's battery life substantially.