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3
Subbase installation
1 Pull wires through
wire hole. Position
subbase 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
subbase, position
over anchors, then
insert and tighten
mounting screws.
Check level if
desired.
Wiring
1 Loosen screw terminals, insert wires
into terminal block, 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
W Heat relay.
Y Compressor contactor.
G Fan relay.
O Heat pump changeover valve energized
in cooling.
Rc Cooling power. Connect to secondary
side of cooling system transformer.
R Heating power. Connect to secondary
side of heating system transformer.
B Heat pump changeover valve energized
in heating.
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- to 22-gauge thermostat wire. Shielded
cable is not required.
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