INSTALLATION
20
21
STEP 8
Wire Thermostat Terminals
NOTE: All wiring must comply with local codes
and ordinances. If unsure about household
wiring procedures, call your local heating/air
conditioning contractor.
Refer to masking tape labels you placed on wires
when you removed your old thermostat.
■■ Match the letter of your old thermostat wire
with the terminal of the corresponding letter on the
back of your new thermostat. Refer to figures on
pages 22-23 and Table 2 for typical wire colors for
easy matching. Hold the thermostat as shown to
minimize need for wire extenders. If wires are still
too short, use wire connectors
(purchase locally) to extend wires.
See figure (left)
for guidelines on using wire
extenders.
■■ In 5-wire installations only,
be sure to remove the factory-
installed jumper connecting
terminals R and Rc .
M1715A
WIRE NUT SIZE
FOR TWO
18-GAUGE WIRES
WIRE
FROM
WALL
6-in. [152 mm] OF
18-GAUGE
THERMOSTAT
WIRE. MATCH
INSULATION
COLORS OR
MARK WIRE ENDS.
METHOD TO INCREASE WIRE LENGTH
TABLE 2—TYPICAL WIRE COLORS AND FUNCTIONS.
THERMOSTAT CONNECT TO
TERMINAL WIRE COLOR
a
FUNCTION
G Green Fan
Y Yellow Cooling
W White Heating
Rc Blue Air Cond. Power
R Red Furnace Power
a
Wire colors are typical; verify at heating/cooling
equipment connection.
■■ Loosen the terminal screws and slip each
wire beneath its matching terminal. See figure
(lower right) for wire insertion technique.
Tighten terminals securely.
■■ Plug the hole in the wall with insulation to
help prevent drafts from adversely affecting
thermostat operation.
M3002
M1712A
JUMPER (FACTORY-
INSTALLED) REMOVE
IF 5-WIRE SYSTEM
INSERT
STRAIGHT
UNDER
SCREW HEAD
5/16 in.
[8 mm]
STRIP
END OF WIRE
VISIBLE HERE
R
R
c
WY G
PROPER WIRING TECHNIQUE
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