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2
PG 2
You will need a small Phillips screwdriver and a drill with 3/16-in. (4.8mm) bit for wall mounts.
Replacement installations - mount the LS-90 in place of the thermostat. You must have a “C” wire or
other 24VAC power available at the LS-90 location. A new location will require moving your wiring.
New installations and for re-locating the LS-90 - follow the guidelines listed below:
• Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the fl oor, and in a room that
is used often.
• Do not install it where there are unusual heating conditions, such as: in direct sunlight; near
a lamp, radio, television, radiator register, fi replace; near hot water pipes in a wall; or near a
stove on the other side of a wall.
• Do not locate in unusual cooling conditions, such as: on a wall
separating an unheated room; or in a draft from a stairwell, door,
or window.
• Do not locate in a damp area. This can lead to corrosion that will
shorten thermostat life.
• Do not locate where air circulation is poor, such as: in a corner, an
alcove; behind an open door.
• Do not install the LS-90 until all construction and painting has
been completed.
• This thermostat does not require leveling.
TOOLS
LOCATION
Good
5ft.
(1.5m)
3
PG 3
Switch OFF electricity to the furnace and air conditioner; then follow these 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. DO NOT remove wires. Note the letters
printed near the terminals. Attach labels (enclosed) to each wire for identifi cation.
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 remov-
ing wires from their terminals, ignore the color of the wires and
LABEL THEM by the terminal where they were screwed.
• 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.
C
G
W
REMOVE OLD UNIT
Caution