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T8501 MICROELECTRONIC THERMOSTATS
69-0925—4 4
Using Thermostat Keys
The thermostat keys are used to:
• set the temperature,
• display present setting,
• configure Installer Setup,
• check System-Test,
• display outdoor temperature (select models),
Select models have keys to:
• set the system operation,
• set the fan operation.
NOTE: Always press the keys with your fingertip or sim-
ilar blunt tool. Sharp instruments like a pen or
pencil point can damage the keyboard.
See Fig. 8 for key locations.
Fig. 8. Thermostat key locations and descriptions.
SETTINGS
System and Fan Settings
System settings control the thermostat operation:
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes between
heating and cooling operation, depending on the
indoor temperature.
Fan settings control the system fan:
On: Fan operates continuously.
Auto: Fan operates with equipment.
The system default setting is Heat and the fan default
setting is Auto. Use the keyboard or System and Fan
switches, depending on model, to change to the desired
settings. See Fig. 9.
Fig. 9. T8501 System and Fan key locations.
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 Self-Test section.
The Installer Setup is used to customize the thermostat
to specific systems. Some of the options include:
— temperature display,
— changeover and
— outdoor temperature display.
Installer Setup numbers are listed in Table 3. The table
includes all the configuration options and the factory-
settings for the T8501.
A combination of key presses are required to use the
Installer Setup feature:
— To enter the Installer Setup, 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. 11 and 12.
— To advance to the next Installer Setup, press the
i key.
— To change a setting, use the increase ! or
decrease # 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 backward to get to the normal display. The
Installer Setup is automatically exited if no key
presses are made for five minutes.
NOTE: Only configurable number are shown.
M6801A
DISPLAY PRESENT
SETTINGS AND SCROLL
THROUGH INSTALLER
SETUP (INFORMATION KEY)
i
DECREASE
TEMPERATURE
SETTING
INCREASE
TEMPERATURE
SETTING
M10147C
i
Press to select
heating or cooling
equipment.
Em. Ht.
-Emergency heating
HeatÑ Heating equipment
Off Ñ No equipment
CoolÑCooling equipment
AutoÑ Thermostat
automatically selects
heating and cooling
equipment.
Press to select
heating or cooling
equipment.
OnÑ Fan runs continuously
AutoÑ Fan runs when
heating or cooling
equipment operates
System
System
System
Fan
Fan
Fan
LED INDICATOR.
1
1