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T8501A,B,C,D MICROELECTRONIC THERMOSTATS
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
B.
PRESS LOWER EDGE OF CASE TO LATCH.
Fig. 7. Mounting thermostat on wallplate.
NOTE: To remove the thermostat from the wall, first pull out
at the bottom of the thermostat; remove top last.
Using Thermostat Keys
The thermostat keys are used to:
• set temperature,
• display present setting,
• configure Installer Setup,
• check Self-Test,
• display outdoor temperature (select models).
Select models have keys to:
• set the system operation,
• set the fan operation.
See Fig. 8 for key information.
Fig. 8. Thermostat key locations and descriptions.
SETTINGS
System and Fan Settings
System settings control the thermostat operation as
follows:
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.
69-0959
M6798A
INCREASE
TEMPERATURE
SETTING
DECREASE
i
TEMPERATURE
SETTING
DISPLAY PRESENT
SETTINGS AND SCROLL
THROUGH INSTALLER
SETUP MODES
(INFORMATION KEY)
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Equipment controls fan.
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 Figs. 9 and 10.
SYSTEM
Selection for heating or cooling
equipment operation.
Heat - Heating equipment
Off - No equipment
Cool - Cooling equipment
Fig. 9. T8501C system and fan switches location.
System
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.
1 CHECK LIGHT ON SELECT MODELS
Fig. 10. T8501D 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
M6801
78°F (25.5°C). Press the increase
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.
4
i
HEAT
OFF
COOL
FAN
ON
AUTO
On - Fan runs continuously
Auto - Fan runs when
heating or cooling
equipment operates
M10146
i
Fan
Press to select
heating or cooling
equipment.
On— Fan runs continuously
Auto—Fan runs when
System
Fan
heating or cooling
equipment operates
1
or decrease
HEAT
OFF
COOL
ON
AUTO
System
Fan
M10147
key to
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