If you don't have an extra wire in the wall, you can power your thermostat with an external transformer. (24VAC @ .5 to 1amp transformer) If you don't already have one, you can purchase one from our online store at http://store.radiothermsotat.com. Once you have a 24VAC transformer, follow the steps below to apply power to your thermostat:
- Connect one wires from the external transformer to the "C" terminal on the thermostat.
- Connect the other wire to the "Rh" terminal
- Plug in your external transformer
- Verify your thermostat has power by removing the batteries