69-1494–1
5
T8400B,C; T8401C ELECTRONIC THERMOSTATS
SYSTEM Switch
System switch settings control thermostat operation as
follows:
Cool: The thermostat controls the cooling system.
Off: Heating and cooling are off.
Heat: The thermostat controls the heating system.
NOTE: Cool Setting availability is model dependent.
Slide the switch in the bottom right corner of the
thermostat to select the desired system setting.
Set Temperature Setpoint
NOTE: Temperature setpoint range is 40° to 99°F
(5° to 37°C).
The setpoint temperature and the room temperature are
shown separately on the digital display. The ▼ indicator
points to Set when the setpoint temperature is dis-
played and to Room when the room temperature is
displayed.
Setting
°
F/
°
C Indication and Heat Cycle Rate
NOTE: To save changes to the °F/°C indication and
the heat cycle rate, all seven steps must be
completed.
To set the °F/°C indication and heat cycle rate:
1. If the temperature is displayed in °F, set the
setpoint temperature to 52°F. If the room tem-
perature is displayed in °C, set the setpoint
temperature to 11°C.
To set setpoint temperature:
1. Select Heat or Cool by sliding the system switch
in the lower right corner of the thermostat to the
desired mode. See Fig. 10.
2. To display the setpoint temperature on the digital
display, press either the ▲ or ▼ key once. The
setpoint temperature is displayed for approxi-
mately five seconds as the indicator points to Set
and flashes.
3. To increase the setpoint temperature, press the ▲
key. Each press changes the setpoint one degree;
press and hold to change the setpoint several
degrees.
Optional System Checkout
When in steps 2 and 3 only, the ▼ key can be
used to turn heat or cool outputs on and off.
Change the system switch setting to test heat
or cool outputs. No action takes place if the
system switch is in the Off position.
Examples: System setting at HEAT: If heat is
on, the ▼ key turns it off; if heat is
off, ▼ turns it on.
System setting at COOL: If cool is
on, ▼ key turns it off; if cool is off,
▼ turns it on.
NOTE: The COOL setting is not available on all
models.
2. Press the ▲▼ keys simultaneously for more than
one second to light all segments on display and to
enter installer setup mode. When the keys are
released, a two-digit software revision code is
displayed.
4. To decrease the setpoint temperature, press the
▼ key. Each press changes the setpoint one
degree; press and hold to change the setpoint
several degrees.
NOTE: In installer setup mode only, each press
of the ▲ key momentarily displays 01.
Each press of the ▼ key momentarily
displays 02. When the keys are released,
these two-digit codes are no longer
displayed.
M1468
M1468
et
Room
INDICATOR
ROOM TEMPERATURE
SETPOINT TEMPERATURE
M1467
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