T8400C1099, T8401C1031 ELECTRONIC THERMOSTATS
69-1484-2 2
Fig. 1. Typical location of thermostat.
Fig. 2. Mounting wallplate to wall.
Setting Fan Operation (Fuel) Switch
The fan operation (fuel) switch is preset at the factory in
the F position. See Fig. 3. This is the correct setting for
most systems. If this system is an electric heat system,
set the switch to the E position. The E setting allows the
fan to turn on immediately with the heating or cooling
equipment in a system where the G terminal is
connected.
Wiring
IMPORTANT
Use an 18-gauge maximum wire to wire the
T8400 and T8401 Thermostats.
All wiring must comply with local electrical codes and
ordinances. Disconnect the power supply to prevent
electrical shock or equipment damage.
NOTE: To ensure proper mounting of thermostat,
restrict all wiring to the shaded area. See Fig. 4.
The shape of the terminals permits insertion of straight or
wraparound wiring connections; either method is
acceptable. See Fig. 5.
Refer to Fig. 6 through 10 for typical wiring hookups.
Fig. 3. Fan operation (fuel) switch.
5 FEET
[1.5 METERS]
YES
NO
NO
NO
M11338
M12202A
WALL WALL
ANCHORS (2)
WALLPLATE
WHEN USING WALL ANCHORS, DRILL 3/16 INCH
HOLES FOR DRYWALL, 7/32 INCH HOLES FOR
PLASTER OR WOOD.
MOUNTING
SCREWS (2)
1
1
M12580
FAN OPERATION (FUEL) SWITCH
F
E