Ecobee ecobee3 - Wiring Diagram: Boiler or Radiant System; Air Handler, Cooling, and Boiler Connections; Heat Pump Reversing Valve Wiring

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Boiler or radiant system with air handler and
conventional cooling or heat pump
Air Handler
Y1 Y2 R C G
Air Conditioner
or Heat Pump*
Y2Y1 C O/B*
Boiler
W1 W2R
ACC–
ACC+
W2
(AUX2)
Y2
C
RH
Rc
G
Y1
W1
(AUX1)
O/B
Do not jumper Rc or Rh ecobee
3
does this automatically. R can go into
either Rc or Rh terminals on your ecobee3.
Stage 2 heat and cool if applicable
* Reversing valve for heat pumps only