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1. Pull wires through wire
hole. Position wallplate
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
wallplate,
position
over anchors,
then
insert and tighten mounting
screws. Check level if
desired.
=
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.
Terrainal
DesignationsmT87N
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. Conneot
to secondary
side of heating system transformer.
B
Heat pump changeover
valve
energized
in heating.
Terrainal
DesignationsmT87K
W
Heat relay.
R
Power. Connect
to secondary
side of
heating system transformer.
Y
This terminal
can be used for some 3-
wire hot-water
valve systems (power
open and close valves).
NOTES
R & Rc terminals
(T87N)
In single-transformer
system, leave metal
jumper
in place between
R & Re. Remove
metal lumper if two-transformer
system.
Heat pump systems
(T87N)
tf 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.
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