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T812, TS812 THERMOSTATS
MOUNTING HOLE
(THERMOSTAT
TO WALL)
MOUNTING
TABS (3)
SCREWS (3)
USED
TO MOUNT
ADJUSTABLE
THERMOSTAT
HEAT ANTICIPATOR
ONTO
INDICATOR LEVER
SUBBASE
Fig. 1. Internal view of T812 with adjustable heat
anticipator.
Wiring and Mounting
All wiring must comply with local codes and
ordinances.
MOUNTING HOLES (2) USED TO
MOUNT THERMOSTAT TO WALL
(FOR MODELS WITHOUT SUBBASE).
Fig. 2. Mounting hole locations for models without
T812 and TS812 Models Without
Subbase
1. In replacement applications, inspect the old
wires for frayed or cracked insulation and
replace any wires in poor condition; in new
installations, run two wires to the location.
2. Grasping the thermostat cover on the top and
the bottom with one hand, push in on the bottom
center and pull outward until the cover snaps
free from the thermostat base.
69-1606EFS—04
SNAP SWITCH CONTACTS
TEMPERATURE
SETTING LEVER
BIMETAL
ADJUSTABLE HEAT
ELEMENT
ANTICIPATOR
SCALE
MOUNTING HOLE
(THERMOSTAT TO WALL)
M20883
subbase.
3. Connect the thermostat wires to the appropriate
terminals on the thermostat back. See Fig. 4-8
for typical hookup diagrams.
4. Push any excess wire back through the hole and
plug any opening to prevent drafts that could
affect thermostat performance.
5. Adjust the heat anticipator (select models) to
match the current draw of the system primary
control. See Heat Anticipator Setting section.
6. Fasten the thermostat to the wall with screws
through the mounting holes on the upper left
and right sides of the device. See Fig. 2.
7. Replace the thermostat cover.
Fig. 3. Mounting hole locations for models with
M20496A
T812 Models With Subbase
1. In replacement applications, inspect the old
wires for frayed or cracked insulation and
replace any wires in poor condition; in new
installations, run the appropriate number of
wires to the location.
2. Grasping thermostat cover on top and bottom
with one hand, push in on bottom center and
pull outward until cover snaps free from
thermostat base.
3. Disconnect thermostat from subbase by
unscrewing the three screws under the
thermostat cover. See Fig. 1.
4. Connect the wires to the terminals on the front
of the subbase. See Fig. 4-8.
5. Push any excess wire back through the hole and
plug any opening to prevent drafts that could
affect thermostat performance.
6. Loosely fasten thermostat subbase to the wall
with a screw through the right mounting hole.
Adjust the subbase so it is approximately level
and start the second screw through the left
mounting slot.
7. Level the thermostat subbase for appearance
only; it is not required for accurate operation.
8. Tighten the mounting screws. See Fig. 3.
9. Mount the thermostat to the thermostat
subbase by tightening the three screws. See
Fig. 1.
10. Adjust the heat anticipator (select models) to
match the current draw of the system primary
control. See Heat Anticipator Setting section.
11. Replace the thermostat cover.
2
MOUNTING HOLES (2) USED TO
MOUNT THERMOSTAT TO WALL
(FOR MODELS WITH SUBBASE).
M20889
subbase.
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