Honeywell CT87K Thermostat User Manual


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3 69-1959EFS—02
Wiring CT87N
[1] If wires will be connected to both R and Rc
terminals, remove the metal jumper.
[2]DonotconnectbothO and B if you have a
heat pump. Connect only the O wire. Wrap B
wire with electrical tape and do not use.
[3]DonotuseC, X or B. Wrap bare end of wire
with electrical tape.
Cover plate
(optional)
Thermostat
base
CT87N
Wiring CT87K
• 2-wire heat-only system: Connect one
wire to R terminal, one wire to W terminal.
• 3-wire hot water heat-only system: Connect
wires R to R, W to W, and Y to Y terminals.
R
W
Y
CT87K
1. Drillholesatpencil-marked
locations(3/16”fordrywall,
7/32”forplaster).
2. Use hammer to tap anchors
into holes until flush with
wall.
3. [Optional] Pull wires through
coverplate(ifneededtocover
marksleftbytheoldthermostat).
4. Pull wires through thermostat
base, position over anchors,
then insert mounting screws.
Check level if desired, then
tighten screws.
Mount thermostat base
1. Match each labeled wire with same
letterontheterminalblock(s).
2. Use a screwdriver to loosen screw
terminals, insert bare wire into
slots, then tighten screws.
3. Pushanyexcesswirebackintothe
wall opening.
Labels don't match?
If labels do not match letters on
thermostat, see table below.
Existing wires Connect to:
R• RH•4• V Terminal “R” [1]
Rc Terminal “Rc” [1]
O Terminal “O” [2]
B Terminal “B” [2]
G•F Terminal “G”
W•W1•H Terminal “W”
Y •Y1•M Terminal “Y”
C•X •B Do not use [3]
Connect wires
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