T812, TS812 THERMOSTATS
69-1606ESF-3
2
Fig. 1. Internal view of T812 with adjustable heat
anticipator.
Wiring and Mounting
All wiring must comply with local codes and ordinances.
Fig. 2. Mounting hole locations for models without
subbase.
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 cen-
ter and pull outward until the cover snaps free from
the thermostat base.
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 con-
trol. 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
subbase.
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 out-
ward until cover snaps free from thermostat base.
3.
Disconnect thermostat from subbase by unscrew-
ing 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 con-
trol. See Heat Anticipator Setting section.
11.
Replace the thermostat cover.
M20496A
MOUNTING HOLE
(THERMOSTAT
TO WALL)
MOUNTING
TABS (3)
MOUNTING HOLE
(THERMOSTAT TO WALL)
TEMPERATURE
SETTING LEVER
SNAP SWITCH CONTACTS
ADJUSTABLE HEAT
ANTICIPATOR
SCALE
ADJUSTABLE
HEAT ANTICIPATOR
INDICATOR LEVER
SCREWS (3)
USED
TO MOUNT
THERMOSTAT
ONTO
SUBBASE
BIMETAL
ELEMENT
M20883
MOUNTING HOLES (2) USED TO
MOUNT THERMOSTAT TO WALL
(FOR MODELS WITHOUT SUBBASE).
M20889
MOUNTING HOLES (2) USED TO
MOUNT THERMOSTAT TO WALL
(FOR MODELS WITH SUBBASE).