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3
Base installation
1 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.
Wiring
1 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 Designations
RHeating 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.