7
Terminal descriptions
G Fan
Rc Cool transformer
Rh Heat transformer
O/B Heat pump reversing valve
Y Y1, Y2: Used for 1 - 2 stages of conventional A/C
or 1 - 2 stages of heat pump compressor
W W1, W2: Used for 1 - 2 stages of conventional heat
or 1 - 2 stages of auxiliary heat with heat pump
C 24VAC common
ACC Accessory (+/-): Used for dehumidifiers,
humidifiers, ventilators, HRVs or ERVs
Warning! ecobee3 is designed for 24VAC with a 2A
maximum current. Do not connect it to line (high)
voltage or millivolt systems.
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