Honeywell T8401C1015 Installation Instructions - Page 5

SYSTEM Switch, Set Temperature Setpoint - no display fan turn on

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SYSTEM Switch System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. Off: Both heating and cooling are off. Heat: The thermostat controls the heating system. Slide the SYSTEM switch in the bottom right corner of the thermostat to select the desired system setting. INCREASE SETTING DECREASE SETTING T8400C, T8401C ELECTRONIC THERMOSTATS 3. To increase the temperature setpoint press the ▲ key. Each press changes the setpoint one degree; press and hold to change the setpoint several degrees. M14681 4. To decrease the temperature setpoint press the ▼ key. Each press changes the setpoint one degree; press and hold to change the setpoint several degrees. M14682 Set Room AuFtAoNOn FAN SWITCH CoSoYl SOTffEMHeat M14678A Fig. 12. Digital display and system switches (FAN and SYSTEM). Set Temperature Setpoint NOTE: Temperature setpoint range is 40° to 99°F (5° to 37°C). The temperature setpoint and the room temperature are shown separately on the digital display. The ▼ indicator points to Set when the temperature setpoint is displayed and to Room when the room temperature is displayed. . INDICATOR Set Room ROOM TEMPERATURE SETPOINT TEMPERATURE M14679 To set temperature setpoint: 1. Select Heat or Cool by sliding the SYSTEM switch in the lower right corner of the thermostat to the desired mode. See Fig. 12. 2. To display the temperature setpoint on the digital display, press either the ▲ or ▼ key once. The temperature setpoint is displayed for approximately five seconds as the indicator points to Set and flashes. M14680 Setting °F/°C Indication and Heat Cycle Rate NOTE: To save changes to the °F/°C indication, the heat cycle rate and the C3/C1 temperature control, tap the ▲ key until exiting the installer setup. To set the °F/°C indication, the heat cycle rate and the C3/C1 temperature control: 1. If the temperature is displayed in °F, set the temperature setpoint to 52°F. If the room temperature is displayed in °C, set the temperature setpoint to 11°C. M14683 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. M14684 System setting at COOL: If cool is on, ▼ key turns it off; if cool is off, ▼ turns it on. M14685 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. M14686 5 69-1740

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T8400C, T8401C ELECTRONIC THERMOSTATS
5
69-1740
SYSTEM Switch
System switch settings control thermostat operation as
follows:
Cool: The thermostat controls the cooling system.
Off: Both heating and cooling are off.
Heat: The thermostat controls the heating system.
Slide the SYSTEM switch in the bottom right corner of
the thermostat to select the desired system setting.
Fig. 12. Digital display and system
switches (FAN and SYSTEM).
Set Temperature Setpoint
NOTE:
Temperature setpoint range is 40± to 99±F (5± to
37±C).
The temperature setpoint and the room temperature are
shown separately on the digital display. The
▼
indicator
points to
Set
when the temperature setpoint is displayed
and to
Room
when the room temperature is displayed.
.
To set temperature setpoint:
1.
Select Heat or Cool by sliding the SYSTEM switch
in the lower right corner of the thermostat to the
desired mode. See Fig. 12.
2.
To display the temperature setpoint on the digital
display, press either the
▲
or
▼
key once. The
temperature setpoint is displayed for approximately
five seconds as the indicator points to
Set
and
flashes.
3.
To increase the temperature setpoint press the
▲
key. Each press changes the setpoint one degree;
press and hold to change the setpoint several
degrees.
4.
To decrease the temperature setpoint press the
▼
key. Each press changes the setpoint one degree;
press and hold to change the setpoint several
degrees.
Setting ±F/±C Indication and Heat Cycle Rate
NOTE:
To save changes to the ±F/±C indication, the
heat cycle rate and the C3/C1 temperature
control, tap the
▲
key until exiting the installer
setup.
To set the ±F/±C indication, the heat cycle rate and the
C3/C1 temperature control:
1.
If the temperature is displayed in ±F, set the tem-
perature setpoint to 52±F. If the room temperature
is displayed in ±C, set the temperature setpoint to
11±C.
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.
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 dis-
played.
SYSTEM
Cool
Off
Heat
Auto
On
FAN
M14678A
INCREASE SETTING
DECREASE SETTING
FAN SWITCH
Set
Room
Set
Room
INDICATOR
ROOM TEMPERATURE
SETPOINT TEMPERATURE
M14679
M14680
M14681
M14682
M14683
M14684
M14685
M14686