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TH115 A/F/AF

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The TH115 programmable thermostat has three temperature control 
modes:

1

 Place the switch to Off to cut power to the heater when not in use 

(e.g., in the summer). This will not affect the time and temperature 
settings.

2

 The thermostat displays the percentage of heating time required to 

maintain the desired temperature. For example,   is displayed when 
heating is activated 40 percent of the time.

1) Press the Hour button to set the hour.
2) Press the Min button to set the minutes.
3) Press the Day button to set the day.
4) Press the Mode/Ret button to exit. 

The display illuminates for 12 seconds when the backlight button is 
pressed.
When either of the 

 buttons is pressed, the display also illuminates 

for 12 seconds. The setpoint temperature appears for 5 seconds, 
then the actual (measured) temperature is displayed.

Setpoint Temperature

The thermostat normally displays the actual (measured) temperature. 
To view the setpoint, press one of the 

 buttons once. The setpoint 

will appear for the next 5 seconds.
To change the setpoint, press one of the 

 buttons until the desired 

temperature is displayed. To scroll faster, press and hold the button.

Preset Temperatures

The thermostat has 3 preset temperatures:
• Comfort temperature 
• Economy temperature 
• Vacation temperature 

To use a preset temperature, press the corresponding button. The 
corresponding icon  ,   or   will be displayed.
The following table shows the intended use and the default setting of 
each of the preset temperatures.

T

o store a preset temperature:

1) Set the desired temperature using the 

 buttons.

2) Press and hold the corresponding button until the corresponding 

icon is displayed.

Floor Temperature Limits (AF mode only)

NOTE: To avoid damaging your floor, follow your floor supplier’s 

recommendations regarding floor temperature limits.

The minimum and maximum floor temperature limits are 5 °C and 
28 °C by default. To modify these limits, proceed as follows:

1) Switch the thermostat to Off.
2) Press and hold the   button.
3) Switch the thermostat back to On.
4) Release the   button when the minimum temperature 

limit (FL:LO) appears.

5) Set the minimum temperature limit using the 

 

buttons.

6) Press the   button to display the maximum 

temperature limit (FL:HI).

7) Set the maximum temperature limit using the 

 

buttons.

8) Press Mode/Ret to exit.

Description

A mode:

controls the ambient air temperature

F mode:

controls the floor temperature using an external 
temperature sensor

AF mode:

controls the ambient air temperature
maintains the floor temperature within desired limits 
using an external temperature sensor

Display
% of heating time

1 to 24% 25 to 49% 50 to 74% 75 to 99%

100%

Clock and Day Setting

Backlight

On/Off switch

 1 

Day and time 
settings

Temperature 
adjustment buttons

Program button

Mode selection /
program exit

Temperature display

Mode display

Period display

Temperature 
preset buttons

Time and day display

Percentage of 
heating time 

2

Backlight button

Program clear 
button

Preset temperature 
indicator

Appears when the 
setpoint is displayed

Temperature control 
mode indicator

Keep the thermostat's air vents clean and unobstructed at all times.

Keep the thermostat's air vents clean and unobstructed at all times.

Temperature Adjustment

Icon

Intended use

A/AF modes

F mode

Comfort 
(when at home)

21 °C

24 °C

Economy 
(when asleep or away from 
home)

17 °C

16 °C

Vacation 
(during prolonged absence) 

10 °C

10 °C

TH115 A/F/AF

User Guide

Programmable Thermostat

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