Ecobee ecobee3 - Accessory Device Connections; Controlling Humidifiers and Ventilators; Accessory Configuration and Power

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Accessory devices
The ecobee3 can control an accessory HVAC device like a
humidifier, dehumidifier, or ventilation device from its ACC
terminals.
2–wire accessory
(humidifier/dehumidifier/ventilator)
Furnace control board Accessory
Note: You will need to configure the accessory device when you
first power on your ecobee3.
Rc
G
Y1
W1
(AUX1)
O/B
ACC–
ACC+
W2
(AUX2)
Y2
C
R
H
R C G Y W Wire1 Wire2