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69-1840EFS—03
1. Pull wires through wire
hole. Position coverplate
on wall, level and mark hole
positions.
2. Drill holes (3/16” for drywall,
7/32” for plaster) and tap in
supplied wall anchors.
3. Pull wire through coverplate
and subbase, position over
anchors, then insert and
tighten mounting screws.
Check level if desired.
4. Apply the large-print labels
to the coverplate, matching
the labels on the subbase.
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
nonflammable 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.
Wiring
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.
R
G
W
Y
B
Rc
O
E
F
Coverplate
Subbase
Large-print
subbase switch
labels
Subbase and base installation
