69-1055—1 4

T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS

A combination of key presses are required to use the
Installer Setup feature.
—To enter the Installer Setup mode, press and hold the
Information i key with the increase ▲ and decrease
▼ keys until the first number is displayed. All display
segments appear for approximately three seconds
before the number is displayed. See Fig. 9 and 10.
—To advance to the next Installer Setup number, press
the Information i key.
—To change a setting, use the increase ▲ or de-
crease ▼ key.
—To exit the Installer Setup, press and hold the
Information i key until the display returns to normal
(approximately three seconds). The display scrolls the
numbers backwards to get to the normal display. The
Installer Setup is automatically exited if no key
presses are made for five minutes.
IMPORTANT
Only configurable numbers are shown on the
device. Example: If the thermostat does not have
a system key, Installer Setup Number 12 will not
be displayed. Review Table 2 factory-settings
and mark any desired changes in the Actual
Setting column. When Installer Setup in com-
plete, review the settings to confirm that they
match the system.
Fig. 8. T8524D system and fan keys location.
NOTE: Always press the system and fan keys with your
fingertip or similar blunt tool. Sharp instruments
like a pen or pencil point can damage the
keyboard.

Temperature Settings

The default setpoint for heat is 70°F (21°C) and for cool is
78°F (25.5°C). Press the increase ▲ or decrease ▼ key to
change the present setting. To change between heat and
cool, press the Information i key until the setting to be
changed appears.
INSTALLER SETUP
NOTE: For most applications, the thermostat factory-
settings do not need to be changed. Review the
factory-settings in Table 2 and if no changes are
necessary, go to the Installer System Test
section.
The Installer Setup is used to customize the thermostat to
specific systems. Installer Setup Numbers are listed in
Table 2. The table includes all the configuration options
available.
Fig. 7. T8524C system and fan switches location.
M10147
i
Press to select
heating or cooling
equipment.
Em. Ht.
-Emergency heating
Heat—Heating equipment
Off —No equipment
Cool—Cooling equipment
Auto—Thermostat
automatically selects
heating and cooling
equipment.
Press to select
heating or cooling
equipment.
On—Fan runs continuously
Auto—Fan runs when
heating or cooling
equipment operates
System
System
System
Fan
Fan
Fan
1
1CHECK LIGHT ON SELECT MODELS
M10105
MODE NUMBER DISPLAY
(COLUMN 2 OF TABLE 2)
FACTORY SETTING OR
OTHER CHOICE DISPLAY
(COLUMN 3 OR 5 OF TABLE 2)
Em HeatOffCool Auto Only
Heat Cool
OnAuto
System Fan
Room
Outdoor
Em Ht Temporary Setting
Wait
%Humid
Aux Ht Remote
Repl
Batt
M4844
M10146
i
HEAT OFF COOL
ON AUTO
HEAT OFF COOL
ON AUTO
SYSTEM
Selection for heating or cooling
equipment operation.
Heat - Heating equipment
Off - No equipment
Cool - Cooling equipment
FAN
On - Fan runs continuously
Auto - Fan runs when
heating or cooling
equipment operates
Fig. 9. Display of all the segments of the LCD.
Fig. 10. Display of Installer Setup mode and setting.
CAUTION
Electric heat systems must be configured to 01 in
Installer Setup 02 to prevent equipment damage
caused by the system running without the fan.