Ecobee ecobee3 lite Installation Manual - page 35
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Rc
G
Y1
W1
(AUX1)
O/B
ACC–
ACC+
W2
(AUX2)
Y2
C
R
H
R C G
Y W
Wire1 Wire2
HRV/ERV
Furnace control board
HRV/ERV
Note:
To determine which wires from your ERV/HRV need to be
connected to the ACC+/ACC- terminals on your ecobee3, you
will need to refer to your ERV/HRV manual. The two wires will
be listed under configurations that enable “optional auxiliary
control for high speed fan” or “dry contact timer configuration”.