L4451 - Thermostat BTICINO - Free user manual and instructions

Product type	Programmable room thermostat (chronothermostat)
Brand	BTicino
Model	L4451
Power supply	2 alkaline batteries 1.5V LR6/AA
Battery life	About 1 year (depending on battery type and settings)
Display	Backlit graphic monitor
Main functions	Heating/air conditioning regulation, weekly programming, manual/holiday/timed/frost protection/off modes
Operation modes	Weekly, Manual, Holiday, Timed, Frost protection (winter) / Thermal protection (summer), Off
Programming	3 editable weekly programs, customizable daily profiles by time slots
Temperature levels	T* (frost protection/protection), T1, T2, T3 adjustable (default: winter T*=7°C, T1=18°C, T2=20°C, T3=22°C)
Outdoor probe (optional)	Functions: inactive, ambient measurement, floor probe, external temperature measurement
Regulation	Standard or proportional (5/10/20 min depending on inertia)
Adjustable contrast	Yes
Temperature unit	°C or °F (adjustable)
Menu languages	Italian (predefined), selectable among several (not listed)
Dimensions (approx.)	Flush-mounted, standard format (80x80 mm)
Weight (approx.)	~200 g (without batteries)
Maintenance	Battery replacement when battery icon appears; clean with a dry cloth
Safety	Frost protection/thermal protection mode; possible reset
Spare parts / repairability	Extractive front panel, standard batteries; no specific spare parts mentioned

Frequently Asked Questions - L4451 BTICINO

How to set the date and time on the BTicino L4451?

Access the Settings menu via the OK button, select Date and Time, then use the ◀▲ buttons to change the digit and ◀◀ to move to the next field. Confirm with OK.

How to change the thermostat batteries?

When the battery icon flashes, remove the front panel from the base. Replace the 2 LR6/AA batteries respecting polarity. Settings are retained. Check the date/time after replacement.

What operating modes are available?

The modes are: Weekly (programming), Manual (fixed temperature), Holiday (frost protection with scheduled return), Timed (temperature for a duration), Frost protection (freeze protection) and Off (stop).

How to program a custom daily profile?

In the Programming menu, select the program (1,2,3), then the day. Use the Edit function: move the cursor with ◀◀, change the temperature level with ◀▲, and confirm with OK for each slot.

What to do if the screen displays a flashing battery icon?

This means the batteries are discharged and the thermostat no longer works. Replace the batteries immediately. The fixed icon indicates about 1 month of battery life remaining.

How to switch from heating mode (winter) to air conditioning mode (summer)?

Press OK, go to Settings then Summer/Winter. Press OK to switch. The installation then goes into Thermal protection (summer) or Frost protection (winter) mode.

How to copy a weekly program to another?

In the Programming menu, select the destination program, choose Copy from, then select the source program and confirm.

How to adjust the contrast of the screen?

Go to Settings > Contrast and use the ◀▲ buttons to adjust. Confirm with OK.

What does the outdoor probe icon alternating with the temperature mean?

If an outdoor probe is connected and set to External temp., the screen displays the outdoor temperature every 2 seconds alternating with the room temperature.

How to perform a complete reset of the thermostat?

In Settings > Reset, confirm with OK. This clears all configurations and programs, restoring factory settings.

USER MANUAL L4451 BTICINO

Flush mounting chronothermostat

item HC/HS/HD4451

L/N/NT4451

AM5721

Manuale d'uso

I Italiano 3
D Deutsch 19
F Français 35
GB English 51
E Español 67
NL Nederlands 83
P Português 99

Isometric line drawing of a wall-mounted device with internal components, labeled 'memoria.' (no other text or symbols)

Illustration of a battery assembly with an orange arrow indicating direction (no text or symbols present)

Diagram of a battery pack with two cells and four terminals, no text or symbols present

Isometric line drawing of a framed wall-mounted device with internal components (no text or symbols)

3D illustration of a battery cell with an orange arrow indicating internal movement (no text or symbols)

Batterien einsetzen

Diagram of a battery pack with two cells, one positive and one negative, showing internal charge distribution (no text or labels)

Menü Setup

Sommer = kühlen, Winter = heizen

Hebdomadaire

Isometric line drawing of a wall-mounted electrical enclosure or panel with internal structure (no text or symbols)

Illustration of a battery assembly with an orange arrow indicating direction (no text or symbols present)

Diagram of a battery pack with two compartments and labeled terminals (no text or symbols beyond basic labels)

1 Introduction and standard functions

■ General information 52

√ The front side 52
The display 53
Symbols 53

■ Your Chronothermostat: use it now! 54

√ First activation 54
√ Navigation keys 54
View the functioning modes 54
√ Scroll the modes 55
√ Change the Weekly mode 55
√ Change the Manual mode 55
√ Change the Holidays mode 55
√ Change the Timed mode 56
√ Change the Antifreeze mode 56
Set the Off mode 56
√ Replacing the batteries 56

2 Customizations

Setup menu 57

√ Set the Summer/Winter functioning mode 57
√ Set the Temperature levels 57
√ Set the Date and Time 57
√ Set the Daylight saving time 57
√ Set the measurement unit of the temperature 58
√ Enable/Disable the Remote control 58
√ Adjust the Display contrast 58
Select the Screen Saver 58
√ Select the Language 58
√ Select the Temperature adjustment 59

√ Calibrating the thermal probe 59
√ Select the function of the external Probe 60
View/Reset the activation Hours 60
√ Resetting the Chronothermostat 60

3 Programming

■ Programming Menu 61

√ Rename a Weekly programme 61
√ Change a Weekly programme 61
√ Copy a Weekly programme 66
√ Display a Weekly programme 66
√ Remove a Weekly programme 66

Introduction and standard functions 1

General information

The 4451 Chronothermostat is a flush-mounting device which can be used for heating and air-conditioning systems; it is possible – through several programming possibilities – to adjust the temperature at any time of the day and in a differentiated manner, every day of the week.

It is possible to choose how to use a standard program (already stored but can be changed according to the specific needs of the user) or to create a new one with a simple programming procedure.

A large back-lit display shows you at all times the programme setting, the status of the system and the temperature of the room.

The Chronothermostat consists of a base used for the system electric connections and a removable front part to allow the user to execute the programming operations and to replace the batteries more easily.

The front side

1 - Graphic display: displays the messages which determine the programming operations as well as the system status
2 - Selection Keys: these let you cycle through the functioning modes inside the menu, if any, while the main screen is being viewed;
3 - OK Key: accesses the main menu, confirms the selection displayed or the data entered
4 - Sensor: measures the ambient temperature
5 - C Key: cancels the selection and returns to the previous page; if held down, it returns to the initial page
6 - Scroll Keys: these let you change the set temperature while the main screen is being viewed; when inside the menu, you can scroll the list of the options available

The display

During normal operation, the graphic display shows the following background information:

Symbols

Depending on the functioning mode selected, the display may be characterised by the following symbols:

Weekly

Temperature profile and number of the operational programme

The range of the corresponding time will flash on the graph (for example, 11:26 will flash on the square corresponding to the time from 11:00 to 12:00).

10:00 12/01/06

Manual

Manual mode Icon (hand)

Holidays

Antifreeze or Thermal protection Icon, time and date of Holidays programme end

Timed

Manual mode Icon and number of hours and minutes to the end of the Timed programme

Antifreeze

Antifreeze (winter)

or Thermal protection (summer) mode Icon

OFF

OFF mode Icon

If an external probe is connected to the Chronothermostat and the preset function is "External Temp.", its associated icon will be shown on the display. Every 2 seconds the outside temperature and the ambient temperature will be displayed alternately (in the same position). (see pag. 60).

External probe

External temperature signaling Icon

When the battery is flat, its signaling icon will be displayed (in any mode, even when the screen saver is functioning). If flashing, the device will not work, thus the batteries need to be replaced.

Battery

Flat battery signaling Icon

Introduction and standard functions 1

- Your Chronothermostat: use it now!

√ First activation

To enable the Chronothermostat:

• select the functioning Language
• set Date / Time
• the Chronothermostat automatically sets to Winter mode and-Weekly PROGRAMME1 mode.

The display shows the currently set selection.

(Italian factory setting)

- The keys can be used to scroll the list and select the language

- Press OK to confirm

After confirming, the Chronothermostat switches to the Set DATE and TIME menu

• Set time and date with keys: increases/decreases the selected digit, scrolls the time and date digits
• Press OK to confirm
• Hold down the C key to exit the menu and return to the main page

The Chronothermostat will automatically set up as follows:

• Winter mode
• Weekly-PROGRAMME1 mode
  To set the Summer mode
• press OK to access the menus
• select Setup with the key
• press OK to confirm

Complete the setup by following the procedure described on pag. 57.

Daylight saving time: if the default setup is kept, "Manual" must be updated manually; to set up the "Automatic" update mode, see paragraph "Set Daylight saving time" on pag. 57.

Navigation keys

When the main screen is displayed, the following operations can be executed with the navigation keys:

OK Key accesses the Main menu - confirm

C Key cancels and returns to the previous mode

←↑Keys depending on the preset mode:

Weekly – Manual – Timed: increase / decrease in the current temperature;

Holidays – Antifreeze – OFF: no effect

←←Keys cycle through the functioning modes

View the functioning modes

When the Chronothermostat display shows the Screen saver (or when it is off), the preset functioning mode will be displayed if any key is pressed.

√ Scroll the modes

When the Chronothermostat display shows the Screen saver (or when it is off), the preset functioning mode will be displayed if any key is pressed.

- Use the ← keys to view the other modes: Weekly, Manual, Holidays, Timed, Antifreeze and Off.

The name of the selected mode flashes to indicate the modification status: if it is not confirmed (by pressing OK) or, if a key is not pressed for more than 10 seconds, the operation will be cancelled, thus displaying the main screen with the current mode.

To set the functioning mode displayed:

- Use the OK key to confirm

the Chronothermostat is now working under the new mode.

Depending on the mode selected, the following modification functions will be possible.

√ Change the Weekly mode

- Use the keys to select the "Weekly" mode

The number of the operative programme flashes as well as the square corresponding to the time.

- Use the keys to scroll the three programmes and to display the daily profile.

Select the required programme; when the number of the programme stops flashing, it will be possible to change the level of the current temperature.

- Use the keys to select the level of the required temperature.

The profile displayed, starting from the flashing square, will be modified with the new temperature level, until the next level is changed.

- Use the OK key to confirm

√ Change the Manual mode

• Use the keys to select the "Manual" mode.
• Use the keys to increase or decrease the value of the preset temperature.
• Use the OK key to confirm or

the C key to cancel and return to the previous mode.

The Chronothermostat is now working under the new preset mode.

√ Change the Holidays mode

• Use the keys to select the "Holidays" mode.
• Use the OK key to confirm

When confirming, the Holidays Mode setup menu will be displayed;

- Use the and keys to set the time and data:

← ↑ increases/decreases the selected digit
← ← scrolls the time and date digits

- Use the OK key to confirm

• Use the keys to select the weekly programme to be reset at the end of the Holidays period.
• Use the OK key to confirm

The display shows the Antifreeze or Thermal protection mode Icon as well as the time and date of the Holidays programme end.

The Chronothermostat is now working under the new preset mode.

Introduction and standard functions 1

√ Change the Timed mode

• Use the keys to select the "Timed" mode.
• Use the keys to increase or decrease the value of the preset temperature.
• Use the OK key to confirm

When confirming, the Timed Mode setup menu will be displayed;

- Use the and keys to set the temperature and hours/minutes

←↑ increases/decreases the selected digit

←toggles from temperature to hours/minutes

- Use the OK key to confirm

The Manual mode Icon and the time to the end of the Timed programme will be displayed.

The Chronothermostat is now working under the new preset mode.

√ Change the Antifreeze mode

• Use the keys to select the "Antifreeze" mode.
• Use the OK key to confirm

The display shows the Antifreeze mode Icon for Winter functioning or the Thermal protection mode Icon for Summer functioning.

The Chronothermostat is now working under the new preset mode.

√ Change the Off mode

• Use the keys to select the "Off" mode.
• Use the OK key to confirm

The Off mode Icon will be displayed.

The Chronothermostat is now working under the new preset mode.

√ Replacing the batteries

When the symbol below is displayed, it is necessary to replace the batteries. If flashing, the device will not work, thus the batteries need to be replaced. The “dead battery” signal appears about one month before the batteries totally run out.

When replacing the batteries, the data stored will be saved.

Isometric line drawing of a wall-mounted panel with internal structure (no text or symbols)

After replacing the batteries, it is recommended to check the Date and Time of the Chrono-thermostat.

3D illustration of a battery pack inside a housing with an orange arrow indicating direction (no text or symbols)

Putting in the batteries

• Remove the Chronothermostat from the base
• Put in the two long-lasting LR6/AA (recommended for photographic applications) 1.5V alkaline batteries according to the polarity shown in the drawing.

The batteries will last for at least 1 year. The duration depends on the type of batteries, on the screen saver selected (see pag. 58) and on the display activation time (about 5 seconds every time a key is pressed).

Diagram of a battery pack with two cells and four terminals, no text or symbols present

Setup menu

The setup menu lets you customize some parameters or functioning modes of the Chronothermostat.

√ Set the Summer/Winter functioning mode

Sets the system functioning mode (default is Winter):

Summer = cooling, Winter = heating

- Use the keys to select the option "Summer/Winter"

- Press OK to confirm

A screen will be displayed showing the indication of the functioning mode being used.

- Press OK to switch over the functioning mode

- Press C to exit the menu and to return to the previous page.

After switching over, the system will set to the Antifreeze mode (for Winter) or Thermal protection (for Summer).

√ Set the Temperature levels

You can set the level of the Antifreeze temperature or Thermal protection T* and the temperature levels T1, T2 and T3 used in the weekly programmes.

The default values are:

Winter T*=7°C, T1=18°C, T2=20°C, T3=22°C

Summer T*=35°C, T1=20°C, T2=23°C, T3=25°C

- Use the keys to select the option "Temperature"

• Press OK to confirm
• Use the keys to select the temperature level
• Use the keys to set the value of the required temperature
• Press OK to confirm and to go back to the previous page or press C to exit the menu and to return to the previous page, hence cancelling the change.

√ Set the Date and Time

For proper operation of your system, make sure that the date and time are set correctly.

• Use the keys to select the option "Date and Time"
• Press OK to confirm
• Set time and date with keys:

←↑ increases/decreases the selected digit,

←← scrolls the time and date digits;

- Press OK to confirm and to go back to the previous page or press C to exit the menu and to return to the previous page, hence cancelling the change.

√ Set the Daylight saving time

For proper operation of your system, make sure that the date and time are set correctly.

• Use the keys to select the option "Daylight saving time"
• Press OK to confirm

A screen will be displayed showing the indication of the status.

• Press OK to switch over the functioning mode
• Press C to exit the menu and to return to the previous page.

Customizations2

√ Set the measurement unit of the temperature

Sets the measurement unit of the temperature: Celsius or Fahrenheit (default is Celsius).

• Use the keys to select the option "Degrees"
• Press OK to confirm

A screen will be displayed showing the indication of the preset measurement unit.

• Press OK to change the measurement unit
• Press C to exit the menu and to return to the previous page.

√ Enable/Disable the Remote control

Enables/Disables the remote control using a telephone actuator of the Chronothermostat (default is Enabled).

The remote contact is managed as follows:

Closed= antifreeze mode activation

Open= last set weekly programme

• Use the keys to select the option "Remote control"
• Press OK to confirm

The display shows the preset status.

• Press OK to change the status
• Press C to exit the menu and to return to the previous page.

√ Adjust the Display contrast

Adjusts the contrast of the graphic display.

• Use the keys to select the option "Contrast"
• Press OK to confirm
• Press OK to confirm and to go back to the previous page or press C to exit the menu and to return to the previous page, hence cancelling the change.

Select the Screen Saver

Selects what you want to show on the Chronothermostat display when in idle condition (default is Temp/date/time).

You can select the following:

1: Only Temp. - temperature measured
2: Temp./date/time - temperature measured and date/time
3: Main - complete main screen
4: Off - display completely off

• Use the keys to select the option "Screen Saver"
• Press OK to confirm

The display shows the currently set selection.

• Use the keys to select the "Screen Saver"
• Press OK to confirm and to go back to the previous page or press C to exit the menu and to return to the previous page, hence cancelling the change.

Please note:

maximum battery duration is guaranteed when the display is OFF.

Select the Language

Selects the language for the menu (default is Italian).

• Use the keys to select the option "Language"
• Press OK to confirm

The display shows the currently set selection.

- Press OK to confirm and to go back to the previous page or press C to exit the menu and to return to the previous page, hence cancelling the change.

√ Select the Temperature adjustment

This setting lets you choose the type of temperature adjustment according to the type of system.

1: Standard default (recommended)
2: Proport. 5min low-inertia systems (fan-coil)
3: Proport. 10min medium-inertia systems (aluminium radiators)
4: Proport. 20min high-inertia systems (cast iron radiators)
- Use the keys to select the option "Adjustment"
- Press OK to confirm

The display shows the currently set selection.

• Use the keys to select the required adjustment
• Press OK to confirm and to go back to the previous page or press C to exit the menu and to return to the previous page, hence cancelling the change.

√ Calibrating the thermal probe

This setting lets you calibrate the measurement of the internal and external probe.

• Use the keys to select the option "Calibration"
• Press OK to confirm

If the external probe is set as a floor probe or used for the outside temperature, the selection of the probe will be given.

- Use the keys to select the probe

- Press OK to confirm

If the external probe is not operative, the calibration menu of the internal probe will be displayed directly.

If the external probe is set for measuring the ambient temperature, the calibration menu of the external probe (internal probe inoperative) will be displayed directly.

• Use the keys to change the temperature
• Press OK to confirm and to go back to the previous page or press C to exit the menu and to return to the previous page, hence cancelling the change.

If you RESET the Chronothermostat, the temperature offset determined during the Calibration will be removed.

Customizations2

√ Select the function of the external Probe

Select the function of the external probe (default is Not active).

You can select the following:

1: Not active - the probe will not be read
2: Ambient Temp - measures the ambient temperature in lieu of the Chronothermostat internal sensor
3: Floor - measures the temperature of the floor and turns off the load if it exceeds the set value
4: External Temp. - measures the external temperature; when selected, every 2 seconds the outside temperature and the ambient temperature will be displayed alternately (in the same position).
- Use the keys to select the option "External probe"
- Press OK to confirm
- Use the keys to select the function
- Press OK to confirm

If you set the "Floor" function, a screen will be displayed which will let you set the threshold temperature of the probe (range: from 15 to 55^ ; default is 35^ ).

• Use the keys to change the threshold temperature
• Press OK to confirm and to go back to the previous page or press C to exit the menu and to return to the previous page, hence cancelling the change.

View/Reset the activation Hours

This function enables you to display/reset the functioning hours of the system.

• Use the to select the option "Operation time"
• Press OK to confirm

The display will show the functioning hours of the system.

• Press OK to confirm and to go back to the previous page or, to reset the counter, use the ←← Ikeys to select the "Reset" function
• Press OK to confirm, C to go back to the previous page.

√ Resetting the Chronothermostat

This lets you totally reset the Chronothermostat; all factory settings will be retrieved.

• Use the keys to select the option "Reset"
• Press OK to confirm

The display will show a confirmation request.

- Press OK to Reset the Chronothermostat and to go back to the previous page or press C to cancel and to return to the previous page.

After executing this operation, the Chronothermostat configuration as well as all the programming operations will be lost!

Programming Menu

Here, you will be able to change/programme the weekly profiles of the 3 weekly programmes for the selected functioning mode (Summer/Winter). Within these programmes, it will be possible to differentiate the temperatures around the clock and for each day of the week.

"PROGRAMME 1" is set in advance but can be changed.

Select the weekly programme to be customized:

Select "Programming" in the Main menu with the keys

Press OK to confirm

select ◀↑ the programme you want to change

the following functions are available for the selected programme:

Use the ←← keys to select the required function

graph TD
    A["Rename"] --> B["Modify"]
    B --> C["Copy from"]
    C --> D["Visualize"]
    D --> E["Erase"]

√ Rename a Weekly programme

When you select this function you can customize the name of the programme (maximum 13 characters).

• Use the keys to select the Programme to be renamed
• Press OK to confirm
• Use the following keys to enter the new name for gramme:

← to move the cursor

←↑ to scroll the characters

- Press OK to save or C to cancel.

The keys scroll alphanumeric characters (only uppercase), numbers and special characters in the following order: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, Z, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, space, dot, hyphen, prime.

√ Change a Weekly programme

When you select this function you can change the selected weekly programme.

• Use the keys to select the Programme to be changed
• Press OK to confirm
• Use the keys to select the day

The following functions are also available for the day selected:

Copy from and View which can be selected with the ←← keys

- press OK to confirm the modification function

It is now possible to modify the profile displayed with the navigation keys, as shown specifically in the following pages.

Programming3

Copy a daily profile

Copy the programme from one day to another.

• Use the keys to select the day you want to copy the profile in
• Select ←← the function Copy from
• Press OK to confirm
• Use the keys to select the day you want to copy
• Press OK to confirm.

Display a daily profile

Displays the profile of the selected day.

• Use the keys to select the day
• Select ← the function Display
• Use the keys to scroll all the days of the week
• Press OK or C to exit the viewing mode.

Daily profile modification tools

Information displayed:

Day of the week

time corresponding to the position of the cursor

There are two working modes:

• SCROLLING

The arrow-shaped cursor lets you move the cursor, using the ← keys, along the timeline without making any changes to the daily profile.

• MODIFYING

The pencil-shaped cursor and the temperature level shown let you move the cursor, using the ←←, keys, along the timeline in order to set the selected temperature level.

Create a new daily profile

It is recommended to follow the procedure described in this example step by step. It will be useful to get you acquainted with the "Modifying" and "Scrolling" modes and with the navigation keys.

Example: creation of the following daily temperature profile for "Monday" of the "WEEK. WINTER" programme.

1 - from h 00:00 to h 06:00 - 18°C (T1)
2 - from h 06:00 to h 09:00 - 22°C (T3)
3 - from h 09:00 to h 16:30 - 20°C (T2)
4 - from h 16:30 to h 22:00 - 22°C (T3)
5 - from h 22:00 to h 24:00 - 20°C (T2)

Use the keys to select Monday and press OK to confirm the Modify function

After completing the procedure, use the "Copy from" function (see page 62) to copy the "Monday" profile to other days of the "WEEK. WINTER" weekly programme.

Programming3

Procedure:

1

2

3

OK confirms and goes to the SCROLLING mode; C cancels and goes back to the days list

Programming3

√ Copy a Weekly programme

This function lets you copy a weekly programme into another one. For example, copy Programme 1 (preset at factory) to WEEK. WINTER.

• Use the keys to select the programme you want to copy
• Use the keys to select the function Copy from
• Press OK to confirm
• Use the keys to select the programme to be copied
• Press OK to confirm

The display will show a confirmation screen

View a Weekly programme

This function lets you display (in “scrolling” mode) the profile of the selected day.

• Use the keys to select the programme
• Use the keys to select the function View
• Press OK to confirm
• Use the keys to select the day
• Press OK to confirm

The display shows the profile associated with the selected day

- Use the keys let you scroll the daily profiles of the whole week.

√ Remove a Weekly programme

This function lets you to eliminate a customized programme and restore the default settings.

• Use the keys to select the programme you want to eliminate
• Use the keys to select the function Erase
• Press OK to confirm
  The display will show a confirmation request.
• Press OK to confirm

The program will be removed and all default settings will be restored (profile and name).

Semanal

Tecla OK accede al menú Principal - confirmar

Illustration of a battery pack and its internal structure, showing an orange arrow indicating direction (no text or symbols present)

Diagram of a battery pack with two stacked cells and positive/negative charges, no text or symbols present

Illustration of a battery assembly with an orange arrow indicating direction (no text or symbols present)

Invoer batterijen

Diagram of a battery pack layout with two cells and four external components (no text or labels)

√ O frontal

Isometric line drawing of a wall-mounted device with internal components, labeled 'na memoria.' (no text or symbols on the diagram itself)

Illustration of a battery pack and its internal structure with an orange arrow indicating direction (no text or symbols)

20154 Milano - Italy

www.bticino.com