Ecobee Wiring Diagram 3. 3-wire heat-only thermostat R G W If you have a heat-only system you may notice that your thermostat has three wiresR G and W. My thermostat has only two wires.
WIRING DIAGRAM Power Extender Kit thermostat wiring Power Extender Kit at your HVAC system NOTE. W2 AUX and or E Emergency wiring connections will normally connect to the ecobee3 W1 terminal. This diagram illustrates the wiring connections for a heat-pump system with auxiliary heating.
These diagrams are also available within the ecobee3 Installation Guide included with your ecobee3 thermostat.
These diagrams are also available within the Installation Guide included with your SmartThermostat with voice control. If you need help with the wiring refer to the reference diagrams at the back of this guide. Ecobee3 Wiring Diagram Ecobee3 Wiring Diagram. W2 AUX and or E Emergency wiring connections will normally connect to the ecobee3 W1 terminal.