Wiring - Honeywell RTH3100C Quick Installation Manual

Advanced Installation Guide

Wiring

About your new thermostat
If labels do not match letters on the thermostat, check
the chart below and connect to terminal as shown here
(see notes, below).
4 3
E Aux
OR OR
X W
X2 W1
W2
E Aux Y
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.
69-2340ES—01
3 2
Y G O
OR OR
Y1 F
M
G O
16
2
1
L R B
OR OR
F V
VR
L R B
2
C
OR OR
H B
X
C
MCR29577