Then run a wire from the other side of the LED to the “W1” terminal on the smart thermostat. Now to wire it together pick a terminal on the transformer to be the “common” and run two wires, one to the LED and one to the “C” terminal on the smart thermostat. ![]() I could have used an actual relay for this but decided to go with something easier, a red LED light that runs on 24 volt AC:įor my smart thermostat I used an ecobee3 (due to their REST APIs) but a Nest should work as well: A smart thermostat uses 24 volt AC to flip on and off a relay (electronic component that uses one power current to toggle another, usually stronger, current). Then you’ll need something that can simulate a single stage heating system. ![]() Modern HVAC systems typically provide 24 volt AC power to thermostats so the first thing you will need is a 120 VAC (wall power) to 24 VAC transformer.
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