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Mounting Thermostat To Wallplate; Setting Fan And System Switches; Operation; Fan Switch - Honeywell TRADELINE T8400C Installation Instructions Manual

Honeywell electronic thermostat installation instructions
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KEEP WIRING IN
ALTERNATE MOUNTING
SHADED AREA
SCREW HOLE
W
Y
G
R
C
WIRING ENTRANCE HOLE
MOUNTING
SCREW HOLE
Fig. 3. Restrict wiring to shaded area.
W
Fig. 4. Wiring connections.
T8400C, T8401C
W
Y
G
R
C
2
1
L1
(HOT)
24V
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
2
IN T8401C INSTALLATIONS, CONNECT C TERMINAL.
Fig. 5. T8400C/T8401C heat-cool wiring diagram in
single transformer system with gas heat/electric
cooling.
MOUNTING
SCREW
HOLE
ALTERNATE
MOUNTING
SCREW HOLE
M11023
Y
G
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM)
R
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM)
C
M11232
TERMINAL SCREW
COOLING
CONTACTOR
FAN
HEATING
RELAY
PRIMARY
CONTROL
T8400C AND T8401C ELECTRONIC THERMOSTATS
T8400C, T8401C
W
Y
G
R
C
2
1
L1
(HOT)
24V
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
IN T8401C INSTALLATIONS, CONNECT C TERMINAL.
Fig. 6. T8400C/T8401C heat-cool wiring
diagram in oil heating/electric cooling system.
Oil primary has its own transformer.

Mounting Thermostat to Wallplate

1. Engage the tabs at the top of the thermostat and
wallplate.
2. Swing down the thermostat and press the lower
edge of the thermostat onto the wallplate to latch.
See Fig. 7.
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
Room
Set
FAN
Auto On
A
ENGAGE TABS AT TOP
OF THERMOSTAT WITH
SLOTS ON WALLPLATE.
M18416
Fig. 7. Mounting thermostat wallplate.

OPERATION

Setting FAN and SYSTEM Switches

Fan and system settings are controlled manually by
using the switches located at the bottom of the
thermostat case. See Fig. 8.

FAN Switch

Fan switch settings are:
On: The fan runs continuously. Use for improved air
M11021B
circulation and air quality.
Auto: Normal setting for most homes. In cooling, the
fan starts and stops with the cooling equipment. In
heating, the fan is controlled directly by the heating
equipment and may start a few minutes after the
heating equipment turns on (on most systems).
When using an electric heat thermostat, the fan
starts and stops with the heating equipment.
3
1
L1
T
(HOT)
OIL PRIMARY
L2
CONTROL
SYSTEM
Cool Off Heat
B
PRESS LOWER EDGE OF
CASE TO LATCH.
COOLING
CONTACTOR
FAN
RELAY
T
M11022B
Set
Room
FAN
SYSTEM
Auto
Cool Off Heat
69-1480-1

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T8401cTradeline t8401c