Honeywell TL8100 Owner's Manual

Honeywell Thermostats Owner's Manual - TL8100.
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USER GUIDE

69-2018EFS-01

TL8100

7 DAY PROGRAMMABLE HYDRONIC THERMOSTAT

1. DESCRIPTION
This thermostat can be used to control the following heating 

systems:

• gas, oil or electric systems

• hot water heating

• hot air system with no fan control

• millivolt system (e.g., gas fireplace)

• electric heating up to 1200 W @ 240 V max.

2. TEMPERATURE DISPLAY 

AND SETTING

Setpoint Temperature
The thermostat normally 

displays the measured 

ambient temperature. To view 

the setpoint temperature, 

briefly press either of the 

 

buttons. The setpoint 

temperature will appear for 5 

seconds.

To adjust the setpoint, press one of the 

 buttons until the 

desired temperature is displayed.

Preset Temperatures
The thermostat has 3 preset temperatures:

To use a preset temperature:

Press the corresponding button (

,   or 

). The 

temperature and the corresponding icon will be displayed.

To change a preset temperature:

1. Set the desired temperature using the 

 buttons.

2. Press and hold the corresponding button (

,   or 

until the icon is displayed on the screen (approximately 

3 seconds).

Programming 
buttons

Temperature 
preset buttons

Temperature 
adjustment 
buttons

Time and day

Temperature

Mode and preset 
temperature 
indicators

Heating 
indicator

Low-battery 
indicator

Appears during the
setpoint display

Preset temperature

Default value

Comfort temperature 

68°F (20°C)

Economy temperature 

64°F (18°C)

Vacation temperature 

50°F (10°C)

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