What Is C Wire For Thermostat - Web the c wire, or “common wire” enables the continuous flow of 24 vac power to the thermostat. Here's what you need to know. When the circuit is complete, 24v energy will flow continuously. Technically speaking, power flows from the r (red) wire, but not continuously (not on its own, anyway). To make it continuous requires a common wire to complete the circuit.
When the circuit is complete, 24v energy will flow continuously. Here's what you need to know. Web the c wire, or “common wire” enables the continuous flow of 24 vac power to the thermostat. To make it continuous requires a common wire to complete the circuit. Technically speaking, power flows from the r (red) wire, but not continuously (not on its own, anyway).