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by—
—drafts or dead spots behind doors, in corners or under
cabinets.
—hot or cold air from ducts.
—radiant heat from sun or appliances
—concealed pipes and chimneys.
—unheated (uncooled) areas behind the thermostat, such
as an outside wall.
IF REPLACING AN EXISTING THERMOSTAT
Turn off power to thermostat at furnace or heat pump. A
two-transformer system may require turning off two switches
or disconnects. Remove any existing wallplate or subbase
from the wall. Label or write down each wire color with the
letter or number on the wiring terminal as the wire is removed,
to avoid miswiring later.
IF NEW INSTALLATION
Run a cable to a hole at the selected wall location, and pull
about 3 in. [76 mm] of wire through the opening. Color-
coded, 8-gauge thermostat cable with one conductor for each
wiring terminal is recommended. Good service practice
recommends selecting cable with one or two more conduc-
tors than the immediate application requires.
MOUNTING SUBBASE
The subbase does not require leveling for proper opera-
tion, but for appearance only.
Remove thermostat from subbase, see Fig. 1.
The subbase mounts directly onto the wall with the screws
included in the package. Use the subbase as a template, and
with a pencil, mark the two mounting screw positions, see
Fig. 2. Use 3/16 in. bit to drill holes for anchors. Gently tap
anchors into holes until they are flush with the wall surface.
Thread wires through the center opening of the subbase. Then
mount the subbase using two screws provided. Gently tighten
screws level top surface of subbase, then securely tighten
screws.
Fig. 1—Removing thermostat from subbase.
WIRING
All wiring must comply with local electrical codes and
ordinances.
Disconnect power before wiring to prevent electrical
shock or equipment damage.
The shape of the terminal barrier permits insertion of
straight or conventional wraparound wiring connections.
Either method is acceptable.
Refer to Figs. 4-6 for typical hookups of subbase and
thermostat.
NOTE: Keep all wiring restricted to ribbed area surround-
ing terminals to assure thermostat/subbase contact, see
Fig. 3.
Fig. 3—Keep wiring restricted to ribbed area
surrounding terminals.
Fig. 2—Mounting subbase on wall.
A
U
X
. H
E
A
T
EM. HT.
O
N
A
U
T
O
F
A
N
M5179A
C
H
E
C
K
HEAT
OFF
AUTO
COOL
SYSTEM
WIRES THROUGH
WALL OPENING
WALL
WALL
ANCHORS
(2)
SUBBASE
MOUNTING
HOLES
MOUNTING
SCREWS (2)
M5175
FOR STRAIGHT INSERTION –
STRIP 5/16 in. [8 mm]
FOR WRAPAROUND –
STRIP 7/16 in. [11 mm]
RESTRICT
WIRING TO
THIS AREA
WIRING TO BE BELOW
THIS SURFACE
TOP SURFACE
OF SUBBASE
FRONT VIEW OF
TERMINAL AREA
CROSS-SECTIONAL VIEW OF
TERMINAL AREA
M3062