Honeywell T8501 SETTINGS, INSTALLER SETUP

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)

iDECREASE

TEMPERATURE

SETTING

INCREASE

TEMPERATURE

SETTING

M10147C

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

Fan

LED INDICATOR.