Remove old unit
Label Wires to Old Unit
Mount the 3M-10
• Separate front from back of unit. Grasp the front of the
unit and the back of the unit and pull apart. The
thermostat body away from the base.
• Hold the base against the wall, with the wires coming
through the opening below the terminal block.
• Position the base for best appearance
• Attach the base to the wall with the two
screws provided.
• If you are mounting the base to sheet
rock or if you are using the old
mounting holes, use the plastic
anchors provided.
Drill a 3/16-in.(4.8mm) hole
for the insert at each screw
location, then mount the base.
PG
3
PG
4
Terminals
• Switch electricity to the furnace and air conditioner OFF;
then proceed with the following steps.
• Remove cover from old thermostat. Most are snap-on types and simply pull
off. Some have locking screws on the side or front. These must be loosened.
• Note the letters printed near the terminals.
• Carefully attach labels (enclosed) to each wire.
Label the wires one at a
time.
You must have all the wires labeled before you proceed.
Remove the wires from the terminals of the old thermostat.
•
Make sure the wires
do not fall back inside
the wall.
•
Wind them around a pencil to
keep them from falling
.
•
Remove the old thermostat from the wall. Fill wall
opening with fiber glass insulation to prevent drafts.
Caution
DO NOT REMOVE WIRES FROM OLD THERMOSTAT UNTIL YOU HAVE
CAREFULLY LABELED THEM, WITH LABELS PROVIDED.
THERE IS NO STANDARD COLOR CODE FOR THESE WIRES.
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