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
Rc
G
Y1
W1
(AUX1)
O/B
ACC–
ACC+
W2
(AUX2)
Y2
C
R
H
Y1 Y2 R C G
Y2Y1 C O/B*
W1 W2R
Stage 2 heat and cool
if applicable
*Reversing valve for heat
pumps only
Air handler
Air conditioner
or Heat pump
Boiler
Note: Do not jumper Rc or Rh,
ecobee3 does this automatically.
R can go into either Rc or Rh
terminals on your ecobee3.