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69-0637—2 2
Installation
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could cause a hazardous condition.
2. Installer must be a trained experienced service techni-
cian.
3. After installation is complete, check out product op-
eration as provided in these instructions.
IMPORTANT: An incorrectly leveled subbase will cause
the temperature control to deviate from setpoint. It is
not a calibration problem.
CAUTION
1. Disconnect power supply to prevent electri-
cal shock or equipment damage.
2. To prevent interference with the thermostat
linkage, keep wire length to a minimum and
run wires as close as possible to the subbase.
3. Do not overtighten thermostat captive mount-
ing screws because damage to subbase
threads can result.
4. Do not short across coil terminals on relay.
This can burn out the thermostat heat an-
ticipator.
LOCATION
Locate thermostat about 5 ft (1.5m) above the floor in an
area with good air circulation at average temperature. Do
not mount the thermostat where it may be affected by—
—drafts, or dead spots behind doors and in corners.
—hot or cold air from ducts.
—radiant heat from the sun or appliances.
—concealed pipes and chimneys.
—unheated (uncooled) areas such as an outside wall
behind the thermostat.
Run wires from the heating, cooling, or heating/cooling
equipment to the new thermostat location.
UNPACK THERMOSTAT
Handle your new thermostat carefully; rough handling
may interfere with its accuracy. Before unpacking, refer to
Fig. 1.
Remove and discard the shipping wrap.
IMPORTANT: Save package of screws and instructions
for the homeowner.
Remove the thermostat cover by lifting from the bottom.
Set aside cover until needed later.
Carefully remove the material protecting the mercury
switch bulb.
Loosen two captive mounting screws.
Fig. 1—Unpack thermostat.
35
3
0
25
20
10
12
11
10
9
8
7
6
5
4
3
2
1
12
11
1
0
9
8
7
6
CAPTIVE MOUNTING
SCREWS
THERMOSTAT BASE
M8673
REMOVE
PACKING
MATERIAL
LIFT
COVER
THERMOSTAT
COVER
MOUNT SUBBASE
Wall Mounting (Fig. 2)
Hold the subbase in position on wall (Fig. 2).
Mark holes on the wall for anchors. Use spirit level to
make sure the wallplate or subbase is level.
Drill 3/16-in. holes, and gently tap anchors into holes
until flush with the wall.
Pull wires through the large wiring hole in the subbase.
Loosely fasten the subbase to the wall with the three
screws. Do not completely tighten the screws.
Carefully level the subbase (Fig. 3), and firmly tighten
the screws.
Fig. 2—Mounting subbase to wall.
M1552A
AUTO OFF
COOL
HEATON
FAN
R
G
O
W
Y
B
3 SCREW HOLES
WITH PLASTIC
ANCHORS
HEATING/COOLING SUBBASE