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Remove old unit
Prepare wires
IMPORTANT : LABEL ALL WIRES
BEFORE DISCONNECTING THEM!
• 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. Attach
labels (enclosed) to each wire for identification.
• Label the wires one at a time. You must label all the wires before
you proceed. With all wires labeled, remove them from the old unit.
• Make sure the wires do not fall back inside the wall. You can wind
them around a pencil to keep them from falling.
• Loosen all screws on the old thermostat and remove it from the wall.
• Fill wall opening with non-combustible insulation to prevent drafts.
PG
3
PG
4
Caution
Read instructions carefully before removing any wiring from existing thermostat.
Wires must be labeled before they are removed. THERE IS NO STANDARD
COLOR CODE. When removing wires from their terminals, ignore the color of
the wires since these may not comply with any standard.
• You will need at least 2.6" of wire for each
of your connections to the 3M-22.
• If you do not have enough wire, splice
additional wire to allow enough slack.
• Fan out wires below the hole as shown.
W
Trim
2.6"