Less Common Wire Designations - Honeywell RTH3100C Installation Manual

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