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English: Page 1 • Français : Page 6 • Español: Página 11
3 69-2040EFS—04
M23793
Wiring CT50/CT53/CT54
• 2-wire heat-only system: Connect one
wire to R terminal, one wire to W terminal.
M23791
Wiring CT51/CT55
[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.
M23792
1. Drill holes at pencil-marked
locations (3/16” holes for
drywall, 7/32” holes for
plaster).
2. Use hammer to tap anchors
into holes until flush with wall.
3. Pull wires through thermostat
base and insert screws.
Check level if desired, then
tighten screws.
Mount thermostat base
1. Match each labeled wire with same
letter on terminal.
2. Use a screwdriver to loosen
screw terminals, insert bare wires
beneath screws, 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 • 5 • 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]
CT51/CT55
CT50/CT53/CT54
Connect wires
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