Honeywell RTH3100C Owner's Manual - Page 14
Connect wires less common wire designations - w1 w2 y
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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. 4 3 3 2 E Aux Y G O or or or or X W Y1 F X2 W1 M W2 If the old thermostat had W1, W2 and Y wires, contact a heating/ cooling contractor for help. E Aux Y G O If no wire matches the E terminal on the new thermostat, use a small piece of wire to connect terminals E and Aux. 1 2 2 LR B C or or or or FV H B VR X LRBC 12
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Installation Guide
1±
Aux
Y
G
O
L
R
B
C
E
Aux
Y
G
O
L
R
B
C
E
4
3
3
2
1
2
2
or
X
X2
or
W
W1
W2
or
Y1
M
or
F
or
F
or
V
VR
or
H
or
B
X
If labels do not match thermostat letters,
check the chart at right (see notes, below).
Connect wires (less common wire designations)
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
.