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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
R
Heating power. Connect to secondary
side of heating system transformer.
Rc
Cooling power. Connect to secondary
side of cooling system transformer.
**
G
Fan relay.
W
Heat relay.
**
B
Heat pump changeover valve energized
in heating.
**
O
Heat pump changeover valve energized
in cooling.
Y
Compressor 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.
