Follow Special Instructions - Honeywell RTH5100B Installation Instructions Manual

Step 4. Follow Special Instructions
1. If you have C and/or C1 wire(s) connected to your
old thermostat, do not connect them to your new
thermostat.
2. Disconnect the C and/or C1 wire(s). Make sure
they do not touch each other or any other wires.
3. Wrap the bare end of each C and/or C1 wire(s)
with electrical tape.
OLD THERMOSTAT
Y
G
C
W
R
DO NOT CONNECT TO NEW THERMOSTAT
7
LETTER
DESIGNATION
SCREW
TERMINAL
WIRE
WIRE HOLE
M22037
69-1716