Some systems will not. The following wiring diagrams are for the ecobee3 lite thermostat and common hvac equipment configurations.

New Thermostat Ecobee3 To Old Galaxy Gg 75 Boiler Needs
Ecobee3 lite wiring diagram. Heat only 2 wire boilerfurnace installations for ecobee thermostats. The r wire needs to go into the rc terminal on your ecobee. Collection of ecobee3 wiring diagram. Do not jumper rc or rh. To download the complete ecobee3 lite installation guide please click here. Ecobee does this automatically.
Ecobee3 lite is designed for 24vac with a 2a maximum current. These diagrams are also available within the ecobee3 lite installation guide included with your ecobee3 lite thermostat. Ecobee3 lite wiring diagrams. A wiring diagram is a streamlined standard photographic representation of an electric circuit. Ecobee3 lite wiring diagrams ecobee support ecobee3 wiring diagram wiring diagram includes many detailed illustrations that display the link of assorted items. Do not connect it to line high voltage or millivolt systems.
Make sure your hvac panel is fully closed. Smartthermostat with voice control and ecobee4 wiring diagrams. 3 wire heat only thermostat r g w installing your ecobee with a boiler and ac dual transformer system ecobee thermostat installation with an isolation. Wiring diagram power extender kit thermostat wiring power extender kit at your hvac system note. It contains directions and diagrams for various varieties of wiring methods and other items like lights windows and so forth. Between your thermostat wiring and your control board.
It shows the components of the circuit as simplified forms as well as the power as well as signal links between the gadgets.