The following wiring diagrams are for the SmartThermostat with voice control and ecobee4 thermostats and common HVAC equipment configurations.
These diagrams are also available within the Installation Guide included with your SmartThermostat with voice control and ecobee4 thermostat. Download the complete SmartThermostat with voice control Installation Guide or the ecobee4 Installation Guide.
Follow the links for additional guidance on installing your:
CONVENTIONAL HEATING & COOLING
HEAT PUMP (AIR OR GEOTHERMAL) WITH AUXILIARY HEAT
BOILER OR RADIANT SYSTEM WITH FORCED AIR
* If you have 2-wire heat only boiler or furnace system, you'll find additional installation instructions via the following articles:
HUMIDIFIER/DEHUMIDIFIER 1-WIRE SETUP
HUMIDIFIER/DEHUMIDIFIER 2-WIRE SETUP
VENTILATOR 2-WIRE SETUP