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English: Page 1 • Français: Page 6 • Español: Página 11
3
Base installation1 Pull wires through wire hole.
Position base on wall, level
and mark hole positions.
2 Drill holes (3/16” for drywall,
7/32” for plaster), then tap in
supplied wall anchors.
3 Pull wire through base, posi-
tion over anchors, then insert
and tighten mounting screws.
Check level if desired.
Wiring1 Loosen screw terminals, insert bare
wires beneath screws, then re-tighten
screws.
2 Push excess wire back into the wall
opening.
3 Plug the wall opening with nonflam-
mable insulation to prevent drafts
from affecting thermostat operation.
Terminal DesignationsRHeating power. Connect to secondary
side of heating system transformer.
RcCooling power. Connect to secondary
side of cooling system transformer. **
GFan relay.
WHeat relay. **
BHeat pump changeover valve energized
in heating. **
OHeat pump changeover valve energized
in cooling.
YCompressor contactor.
** Not present in T834L model
NOTES
R & Rc terminals
In single-transformer system, leave metal
jumper in place between R & Rc. Remove
metal jumper if two-transformer system.
Heat pump systems
If wiring to a heat pump, use a small piece of
wire (not supplied) to connect terminals W
and Y.
Wire specifications
Use 18-gauge thermostat wire. Shielded
cable is not required.