Honeywell The Round T87N Easy-To-See Owner's Manual page 3

Subbase and base installation
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.
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
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.
English: Page 1 • Français:
Coverplate
R
Rc
O
NOTES
R & Rc terminals
In single-transformer system, leave metal
jumper in place between
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.
3
Page 6 • Español:
Large-print
subbase switch
labels
Subbase
E
F
& . Remove
R Rc
69-1840EFS—07
Página 11
G
W
Y
B