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Installation Guide
Connect wires (less common wire designations)
If labels do not match thermostat letters,
check the chart at right (see notes, below).
If the old thermostat had both V
and VR wires, contact a heating/
cooling contractor for help.
If the old thermostat had both O
and B wires, attach the B wire to
the C terminal. If another wire is
attached to the C terminal, call
1-800-468-1502 for help.
If the old thermostat had W1, W2
and Y wires, contact a heating/
cooling contractor for help.
If no wire matches the E terminal on the new thermostat,
use a small piece of wire to connect terminals E and Aux.
4
3
3
E
Aux
Y
or
or
or
X
W
Y1
X2
W1
M
W2
E
Aux Y
G
1
2
1
G
O
L
R
or
or
or
F
F
V
VR
O
L
R
2
2
B
C
or
or
H
B
X
B
C
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