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21 69-0733—3
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
your new thermostat. Refer to illustrations on
pages 22 and 23.
In 5-wire installations only, be sure to re-
move the factory-installed jumper connect-
ing terminals R and Rc.
STEP 8
Wire Wallplate Terminals
INSTALLATION
22 69-0733—3
■■ Loosen the terminal screws and slip each
wire beneath its matching terminal. Either
straight or wraparound wiring connections are
acceptable (see illustration). Tighten terminals.
■■ Plug the hole in the wall with insulation to
help prevent drafts from adversely affecting
thermostat operation.
M2486
FOR STRAIGHT INSERTION–
STRIP 5/16 IN. (8MM)
FOR WRAPAROUND–
STRIP 7/16 IN. (11MM)
M612A
THERMOSTAT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
2-WIRE HEAT-ONLY (JUMPER INTACT)
HEATING
RELAY OR
VALVE COIL
W
G
R
R
C
Y
M614A
THERMOSTAT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
4-WIRE HEAT/COOL (JUMPER INTACT)
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
W
G
R
R
C
Y