AURATON Libra

User manual ver. 20220222
This document collects information on the safety, installation and use of the AURATON Libra device.

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Weekly wired temperature controller

AURATON Libra is a weekly, wired temperature controller designed to work with a gas or electric heating device.

Description of AURATON Libra

weekly, wired temperature controller

On the front of the controller housing there is a backlit LCD display, four function buttons and a temperature setting knob with an OK .

Display

1. Day of the week (8 ) – Indicates what day of the week it is. Each day is assigned a number.
2. Temperature – In normal operation mode, AURATON Libra displays the temperature of the room in which it is installed.
3. Temperature Unit – Indicates whether the temperature is displayed in degrees Celsius (°C).
4. Clock
   The time is displayed in a 24-hour system.
5. Timeline:
   Program progress indicator. This line is divided into 24 segments, each representing one hour. It shows how a given program is being executed. (See the "Timeline" section.)
6. Day mode indicator ( S )
   Indicates that AURATON Libra is operating in day mode. (see chapter: "Temperature programming")
7. Night mode indicator ( T )
   Indicates that AURATON Libra is operating in night mode. (see chapter: "Temperature programming")
8. Anti-freeze mode indicator ( U )
   Indicates that AURATON Libra is operating in anti-freeze mode. (see section: "Anti-freeze mode")
9. Manual control indicator ( V )
   Appears when you exit programmed operation. (see section: "Manual control mode")
10. AURATON Libra ON indicator ( Y )
    Segment informing about the operating status of the AURATON Libra. Visible when the controlled device is turned on.
11. Program number
    Indicates the number of the program currently running. (See chapters: "Factory programs" and "Weekly programming")
12. Battery drain (X)
    This indicator appears when the battery voltage exceeds the minimum allowable level. The batteries should be replaced as soon as possible.
    
    NOTE:
    To maintain the programmed parameters, the battery replacement operation time should not exceed 30 seconds.

Choosing the right location for AURATON Libra

The proper operation of the AURATON Libra is significantly affected by its location. Siting it in a location lacking air circulation or exposed to direct sunlight may result in improper temperature control. The AURATON Libra should be installed on an interior wall (partition wall), in an environment with free air circulation. Avoid proximity to heat-emitting devices (television, radiator, refrigerator) or locations exposed to direct sunlight. Proper operation may be impaired by proximity to doors, which expose the AURATON Libra to potential vibration.

Connecting the cables to AURATON Libra

To connect the cables, remove the housing as shown below:

The cable terminals are located on the rear wall of the AURATON Libra, under a plastic cover.

1. cover
2. screw
3. cable clamps

This is a typical single-pole, two-state relay. In most cases, the NC terminal is not used.

Battery replacement

The battery compartment is located inside the AURATON Libra on the front of the case. To install the batteries, remove the AURATON Libra case as shown in the figure below:

1. 1.5V AAA battery slot

Insert two 1.5V AAA batteries into the battery compartment, paying attention to the correct polarity of the batteries.

Mounting the AURATON Libra – weekly, wired temperature controller

To attach AURATON Libra to the wall:

1. Remove the cover (as shown in the "Replacing the Battery" section)
2. Drill two 6 mm diameter holes in the wall (mark the hole spacing using the rear part of the AURATON Libra housing).
3. Insert the expansion bolts into the drilled holes.
4. Screw the rear part of the AURATON Libra housing to the wall using the screws included in the kit.
5. Put the casing on.

1. hole for the mounting screw

Attaching the casing: NOTE

When putting the front part of the housing back onto the back, pay attention to the pins that control the relay.

1. Front cover
2. Back cover
3. Pins
4. Pin connector socket or the point where the pins contact the board

First launch of AURATON Libra

Setting the clock and day of the week

To set the clock you need to:

1. Press the buttonm . The hour segment will start flashing on the display.

   

2. By turning the knob left or right, you set the desired hour and confirm with the button. (.

3. By turning the knob left or right, we set the correct value in the minute segment and confirm it again with the button. (.

   

4. A flashing day of the week symbol appears in the upper left corner. Turn the knob left or right to set the desired day and confirm your selection with the button. (.

   

   NOTE:
   You can also switch using the buttonm .

   Default program settings

   • Monday - Friday:
     the heating device operates at the day temperature ( S ) from 05:00 to 08:00 and from 15:00 to 23:00
   • Saturday - Sunday:
     the heating device operates at the day temperature ( S ) from 06:00 to 23:00
   • default temperature settings:
     S day temperature – 21.0°C
     T night temperature – 19.0°C
     U anti-freeze temperature – 7.0°C

   Programming day and night temperatures

   AURATON Libra allows you to programmatically set 2 types of temperature:

   • Daytime temperature ( S ) – from 5 to 30°C
   • Night temperature ( T ) – from 5 to 30°C

   
   To set one of the above temperatures:

   1. Press the buttonn .

   2. The display will show the currently set temperature with the symbol:
      S – day temperature;
      T – night temperature.

      

   3. By turning the knob left or right we set the desired temperature value.
   4. Pressing the buttonn will switch the editing mode between day and night temperature ( S , T ).
   5. After setting the temperatures, confirm everything with the button. ().
   NOTE:
   The night temperature setting must be lower than the day temperature. It is not possible to set the night temperature higher than the day temperature.

   Introduction to programming

   Timeline

   The timeline on the LCD display is divided into 24 sections, each representing one hour of the day.
   Black rectangles above the timeline indicate that the program has set the daytime temperature for that time; their absence indicates that the program has set the nighttime temperature.

   Example:

   

   The figure above shows that from 6:00 a.m. to 11:00 p.m., Auraton Libra will control the heating device to maintain the room at day temperature ( S ). From 11:00 p.m. to 6:00 a.m., AURATON Libra will switch to night temperature ( T ).

   Factory programs

   To ensure the AURATON Libra knows when to switch to the day and night temperatures, you need to set a specific program for each day of the week. To do this, you can use one of three preset programs (from 0 to 2):

   Program No. 0 – Anti-freeze. U
   This factory program cannot be modified. Designed for setting the anti-freeze temperature all day long.

   Program No. 1 – Weekly
   . Non-modifiable factory program. Sets the daily temperature from 5:00 to 8:00 and from 15:00 to 23:00.

   Program No. 2 – Weekend
   . This factory program cannot be modified. It sets the daily temperature from 6:00 a.m. to 11:00 p.m.

   Program No. 3, 4,…, 8 – User
   Programs No. 3 through No. 8 are user programs. They can be freely modified and adapted to your requirements.

   Programming

   Weekly programming

   Programming the AURATON Libra involves specifying the hours for a given day of the week during which the daytime temperature should be maintained. The nighttime temperature then applies.

   Example AURATON Libra from Monday to Sunday. Outside the time periods specified below, AURATON Libra will maintain a lower night-time temperature.

   Day	Daytime temperature
   Monday	5:00 – 8:00; 15:00 – 23:00
   Tuesday	5:00 – 8:00; 15:00 – 23:00
   Wednesday	5:00 – 8:00; 15:00 – 23:00
   Thursday	5:00 – 8:00; 15:00 – 23:00
   Friday	5:00 – 8:00; 15:00 – 23:00
   Saturday	8:00 – 23:00
   Sunday	8:00 – 23:00

   Program selection

   To set up the program:

   1. Press the buttonh . The program number segment will begin flashing.

      

   2. Press the buttonm as many times as necessary to select the day of the week on which the program is to be carried out.

      

   3. Press the button several timesh and select the desired program number. Programs 0-2 are factory-set, programs 3-8 can be modified.

      

   4. Confirm your selection with the button (.
   5. Repeat the procedure for the next days of the week.

   Modifying a user program

   To set up the program:

   1. Press the buttonh . The program number segment will begin flashing.

      

   2. Press the buttonm as many times as necessary to select the day of the week on which the program is to be carried out.

      

   3. Press the button several timesh and select the desired program number. Programs 0-2 are factory-set, programs 3-8 can be modified.

      

   4. All 24 black rectangles on the timeline will be lit, each representing one hour. A visible rectangle indicates that the daytime temperature is to be achieved at that hour. The absence of a rectangle above the timeline indicates that the nighttime temperature is scheduled.

      The flashing rectangle indicates where on the timeline we are making changes.

      

   5. Use the buttonr to select the day temperature (light rectangle) or night temperature (light rectangle). Then, use the knob to select the time interval for the given temperature.

      

   6. By pressing the buttonr and selecting the time interval, we modify the entire program.

      

   7. We confirm everything with the button (
   
   
   NOTE:
   A modified program for a specific day can be selected and implemented also on another day of the week.

   Manual control

   V

   Option 1:
   If for any reason you wish to interrupt the current program and extend the day or night temperature, you can do so manually, but for no longer than 24 hours. To do this:

   Hold the buttonr for 3 seconds. Then use the knob to select the number of manual operation hours (maximum 24 hours) and confirm the setting by pressing the button( .

   AURATON Libra will wait for you to set which of the two temperatures it should maintain (day or night). Changes can be made using the buttonr or the knob. Confirm your selection with the button( .

   Option 2:
   If you would like to suspend the program, e.g., due to a prolonged party, and AURATON Libra has already started lowering the temperature to the night temperature (the T ), and you would like to maintain the comfortable temperature until the end of the party, proceed as follows:
   Press the buttonr the V and S symbols will appear on the display . The day temperature will then be maintained until the next temperature change implemented by the program.
   To cancel this function, press the button( ; the symbol will disappearr from the display.

   Similarly, if the program is maintaining the day temperature, and you want to immediately enter the night temperature, then:
   Press the buttonr V and T symbols will appear on the display . The night temperature will then be maintained until the next temperature change implemented by the program. To cancel this function, press the button( ; the symbol will disappearr from the display.

   Antifreeze temperature

   U

   In the event of an extended absence, you can activate the anti-freeze temperature mode. This prevents the unpleasant consequences of water freezing in the heating system by automatically setting the temperature to 7°C. To set the anti-freeze program, simply select program 0 on the desired day of the week.

   RESET AURATON Libra

   Reset is performed by removing the battery until the data disappears from the display.

   MASTER RESET AURATON Libra

   A MASTER RESET is performed by pressing and holding the button( while inserting the batteries. This returns the AURATON Libra to its factory settings.

   NOTE:
   All user programs are deleted!

   Configuration settings

   Configuration settings are made sequentially:

   heating mode/
   air conditioning mode
   
   
   hysteresis change
   
   
   delay change
   
   
   offset change
   
   
   clock calibration
   
   

   To enter the configuration settings change mode, hold down theh and( for 3 seconds until the settings menu is displayed.

   Heating mode/Air conditioning mode

   AURATON Libra can operate in two modes:

   	Heating mode (factory set) – set it when AURATON Libra is to cooperate with heating devices.
   	Air conditioning mode – set it when AURATON Libra is to cooperate with air conditioning devices.

   Turn the knob left or right to set the desired mode. Confirm your selection by pressing the button( . AURATON Libra will move on to the next parameter.

   Hysteresis change

   Hysteresis is designed to prevent the actuator from switching on too frequently due to minor temperature fluctuations.
   For example, for HI 2 hysteresis, with the temperature set to 20°C, the boiler will turn on at 19.8°C and turn off at 20.2°C. For HI 4 hysteresis, with the temperature set to 20°C, the boiler will turn on at 19.6°C and turn off at 20.4°C.

   

   The hysteresis change mode is indicated by the flashing HI sign. Turn the knob left or right to set the desired hysteresis.
   HI 2 – ±0.2 °C (factory setting),
   HI 4 – ±0.4 °C,
   HI P – PWM operating mode (section “PWM operating mode”).
   
   Confirm the selection by pressing the button( . AURATON Libra will move on to changing the next parameter.

   Change delay

   The delay prevents the actuator from being switched on too frequently, e.g. due to a momentary draft (e.g. caused by opening a window).

   The delay change mode is indicated by the flashing 90:SE . Turn the knob
   left or right to set the delay.
   90:SE – 90-second delay
   (factory setting),
   0:SE – no delay
   
   Confirm your selection by pressing the button( . AURATON Libra will move on to changing the next parameter.

   

   Offset change

   Offset allows you to calibrate temperature readings with a tolerance of ±3°C. For example, the AURATON Libra indicates that the room temperature is 23°C, while a standard room thermometer hanging next to it reads 24°C. By changing the offset by +1 degree, the AURATON Libra will display the same temperature as the room thermometer.

   Offset change mode is indicated by the flashing OFFS sign. Turn the knob left or right to set the desired value within the range of -3.0 to 3.0 (factory setting – 0.0). Confirm your selection by pressing the button( . AURATON Libra will move on to the next parameter.

   

   NOTE:
   If you do not press any button for 10 seconds while changing the configuration settings, AURATON Libra will return to normal operating mode.
   NOTE:
   The first press of any function button always turns on the backlight, and only the next press activates the button function.

   Clock calibration

   This function is used to correct the clock readings if they deviate. If you notice the clock is malfunctioning over the course of a week, determine the error rate. This value should be entered in the AURATON Libra in seconds. Confirm your selection by pressing the OK button. AURATON Libra returns to normal operation.

   Example 1:
   After a week of operation, the AURATON Libra displays the time faster by 1 minute and 20 seconds (60 + 20 = 80). In this case, slow down the clock by setting C -80.

   Example 2:
   After a week of operation, AURATON Libra indicates time slowed by 2 minutes (2 x 60 = 120). In this case, speed up the clock by setting C 120.

   NOTE:
   For the clock calibration function to work correctly, the number of seconds must be determined after a week of AURATON Libra operation (7 days = number of seconds to be added or subtracted, maximum 294 seconds).
   NOTE:
   If you do not press any button for 10 seconds while changing the configuration settings, AURATON Libra will return to normal operating mode.

   PWM operating mode

    (Pulse-Width Modulation)

   By changing the hysteresis settings (see the "Configuration Settings" section), you can enable PWM operation. In this mode, AURATON Libra periodically switches the heating device on to minimize temperature fluctuations. AURATON Libra checks the temperature rise and fall times.

   Knowing these values, AURATON Libra turns the heating device on and off in cycles to keep the temperature as close to the set point as possible.

   

   1. Temperature
   2. Time
   3. Set temperature
   4. Room temperature
   NOTE:
   In PWM mode, AURATON Libra may turn on the heating device even if the room temperature is higher than the setpoint. This is due to the PWM algorithm, which aims to maintain the setpoint temperature and anticipate the heating system's behavior.

   Additional notes

   • At least 30 seconds must pass between the next switching off and switching on of the relay.
   • In AURATON Libra, you can turn the control functions on or off at any time (e.g. after the heating season) by briefly (approx. 5 seconds) holding the button( (AURATON Libra will only show the current time and room temperature – no "timeline").
   • The first press of any function button always turns on the backlight, and only the next press activates the button's function. When using the knob, each step keeps the backlight on.
   • When programming any function, not pressing any button for 10 seconds is equivalent to pressing the button. (.

   AURATON Libra connection diagram

   

   1. A heating device , e.g. a gas furnace
   2. Electric heating device (MAX 230V AC, 16 A)

   Cleaning and maintenance

   • Clean the exterior of the device with a dry cloth. Do not use solvents (such as benzene, thinner, or alcohol).
   • Do not touch the device with wet hands. This may result in electric shock or serious damage to the device.
   • Do not expose the device to excessive smoke or dust.
   • Do not touch the screen with a sharp object.
   • Avoid contact of the device with liquids or moisture.

   Technical data

   Power supply:	2 x AAA (2 x 1.5 V), alkaline
   Operating temperature range:	0 – 45 °C
   Operating status indication:	LCD display
   Number of temperature levels:	2
   Antifreeze temperature:	7 °C
   Temperature control range:	5 – 30 °C (measurement error +/- 1 °C)
   Hysteresis:	±0.2 °C / ±0.4 °C / PWM
   Relay load capacity:	Max. 250 V AC, max. 16 A
   Duty cycle:	Weekly programmable
   Degree of protection:	IP20
   Dimensions [mm]:	90 x 90 x 36

   Disposal of the device

   O

   Devices are marked with a crossed-out waste bin symbol. In accordance with European Directive 2012/19/EU and the Waste Electrical and Electronic Equipment Act, this marking indicates that this equipment, after its useful life, must not be disposed of with other household waste.
   Users are obligated to dispose of it at a collection point for used electrical and electronic equipment.

   
   
   

   LARS Andrzej Szymański hereby declares that the AURATON Libra radio equipment type complies with Directives 2014/53/EU and 2011/65/EU. The full text of the EU declaration of conformity is available in the download section below.

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   Manufacturer's address and contact details:
   LARS, ul. Świerkowa 14
   64-320 Niepruszewo
   www.auraton.pl

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   Downloads

   • User manual
   • Declaration of Conformity