Honeywell RTH3100C Owner's Manual page 4

2 Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
Do not remove wallplate yet
Terminal
designation
3 Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them. If any
wires are not attached to terminals in your old thermostat, do not connect them
to your new thermostat.
Wrap the bare metal ends of each unused wire with electrical tape, so it cannot
touch and short out other wires.
4 Separate Wallplate from
New Thermostat
Remove wallplate from the new thermostat
and mount onto wall.
If you have an older thermostat with a
sealed mercury tube, turn to page 2
for proper disposal instructions.
C
Terminal designation
M28100
4
MCR33823
Wire Labels
C
MCR31537
Wallplate