Honeywell ELECTRONIC THERMOSTATS T8401C Installation Instructions Manual page 3

Setting Fan Operation (Fuel) Switch
The fan operation (fuel) switch is preset at the factory in
the F position. See Fig. 4. 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
.
FAN OPERATION (FUEL) SWITCH
Fig. 4. Fan operation (fuel) switch.
Wiring
IMPORTANT
Use an 18-gauge thermostat cable for proper
wiring.
All wiring must comply with local electrical codes and
ordinances. Disconnect the power supply to prevent
electrical shock or equipment damage.
NOTE: NOTE: To ensure proper mounting of thermo-
stat, restrict all wiring to the shaded area. See
Fig. 5.
The shape of the terminals permits insertion of straight or
wraparound wiring connections; either method is
acceptable. See Fig. 6.
The T8401C is powered directly from the zone panel.
Refer to Fig. 7, 8, and 9 for typical wiring hookups.
E
F
M12580
3
T8401C ELECTRONIC THERMOSTATS
KEEP WIRING IN
SHADED AREA
G
C
R
W
Y
WIRING ENTRANCE
MOUNTING
HOLE
SCREW HOLE
Fig. 5. Restrict wiring to shaded area.
TERMINAL
SCREW
G
C
R
W
Y
Fig. 6. Wiring connections.
B
O
MOUNTING
SCREW HOLE
M14286
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM)
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM)
B
O
M14287
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