AURATON Libra DS

User manual ver. 20220222
The document presents collected information on safety, assembly and use of AURATON Libra DS.

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Weekly, wired thermostat (dual sensor)

AURATON Libra DS is a weekly, wired thermostat with an additional external temperature sensor on the wire. Works with a gas or electric heating device. Designed to control underfloor heating.

Description of the AURATON Libra DS

Weekly, wired thermostat

There is a backlit LCD display, four function buttons and a temperature setting knob with an OK button on the front part of the regulator’s casing.

1. LCD display
2. setting knob with integrated ( button
3. mode selection buttons:
   S – day mode – comfort,
   T – night mode – economic
4. selection button
5. date/time/day of week setting button
6. temperature setting button

Display

1. Day of the week (8) – Indicates what day of the week it is. Each day is assigned a number.
2. Temperature – AURATON Libra DS displays the temperature of the room in which it is installed in normal operation mode.
3. Temperature unit – tells you that the temperature is displayed in Celsius degrees (°C).
4. Clock
   Time is displayed in a 24-hour system.
5. Timeline
   Program progress indicator. The timeline is divided into 24 segments, each of which corresponds to one hour. It shows how a given program is implemented. (see chapter “Timeline”)
6. Day mode indicator (S)
   Indicates that AURATON Libra DS is operating in the day mode. (see chapter “Temperature programming”)
7. Night mode indicator (T)
   Indicates that AURATON Libra DS is operating in the night mode. (see chapter “Temperature programming”)
8. Anti-freezing mode indicator (U)
   Indicates that AURATON Libra DS is operating in the anti-freezing mode. (see chapter “Anti-freeze mode”)
9. Manual control indicator (V)
   Appears when no program is used. (see chapter “Manual control mode”)
10. AURATON Libra DS activation indicator (Y)
    Segment giving information about the operating status of AURATON Libra DS. Visible when the regulator is turned on.
11. Program number
    Indicates the number of the currently running program. (see chapters “Factory programs” and “Weekly programming”)
12. Dead batteries (X)
    The indicator is visible when the minimum permissible battery voltage level is exceeded. The batteries need to be replaced as soon as possible.
    
    IMPORTANT:
    In order to maintain any programmed parameters, the battery replacement operation should not exceed 30 seconds.

Choosing the right location for AURATON Libra DS

The correct operation of AURATON Libra DS is largely influenced by its location. Using the device in a place with no air circulation or a place with direct sunlight may result in incorrect temperature control. AURATON Libra DS should be installed on the internal wall of a building (a partition wall), in an environment with free air circulation. You should avoid proximity to heat-emitting devices (TV, heaters, refrigerators) or locations exposed to direct sunlight. The vicinity of doors and exposing AURATON Libra DS to possible vibrations may also cause problems with proper operation of the device.

Connecting cables to AURATON Libra DS

To connect the wires, remove the casing as shown below:

The terminals are located on the back of AURATON Libra DS, under the plastic casing.

1. cover
2. screw
3. wire terminals

It is a typical single-pole double-throw relay. In most cases, the NC terminal is not used.

Battery replacement

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

1. AAA 1.5 V battery socket

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

Mounting AURATON Libra DS – the weekly, wired temperature regulator

In order to mount AURATON Libra DS on the wall:

1. Remove the casing (as shown in the “Battery Replacement” section)
2. Drill two holes with a diameter of 6 mm in the wall (mark the spacing between the holes using the rear part of the AURATON Libra DS casing).
3. Put wall plugs in the drilled holes.
4. Fix the rear part of the casing of AURATON Libra DS to the wall using the screws included in the kit.
5. Put the casing on.

1. hole for fastening screw

Putting the casing back on: IMPORTANT

Pay attention to the pins that transmit control to the relay when putting the front part of the casing to the rear part.

1. Front casing
2. Rear casing
3. Pins
4. The socket of the pin connector or the place where the pins contact the board

Turning AURATON Libra DS on for the first time

Setting the clock and day of the week

To set the clock:

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

   

2. Turn the knob to the left or right to set the required hour and confirm with using the ( button.

3. Turn the knob to the left or right to set the correct value on the minute segment and confirm using the ( button.

   

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

   

   IMPORTANT:
   You can also switch by pressing the m button.

Default program setting

• Monday – Friday:
  The heating device maintains the day temperature (S) from 05:00 to 8:00 A.M. and from 3:00 to 11:00 P.M.
• Saturday – Sunday:
  The heating device maintains the day temperature (S) from 06:00 A.M. to 11:00 P.M.
• default temperature settings:
  S day temperature – 21,0°C
  T night temperature – 19,0°C
  U anti-freeze temperature – 7,0°C
  ¸ temperature of the external sensor – 40.0 °C (when an external sensor is connected)

Programming day and night temperatures

AURATON Libra DS allows you to program 3 types of temperature:

• Day temperature (S) – from 5 to 30 °C
• Night temperature (T) – from 5 to 30 °C
• Temperature of the external sensor (¸) – from 10 to 55 °C

To set one of the temperatures above:

1. Press the n button.

2. The display will show the currently set temperature with one of the two symbols:
   S – day temperature;
   T – night temperature;
   ¸ – temperature of the external sensor (when an external sensor is connected).

   

3. Turn the knob to the left or right to set the desired temperature value.
4. Pressing the n button will switch the edit mode between the day and night temperatures (S, T).
5. After setting the temperatures, confirm using the () button.

Introduction to programming

Timeline

The timeline on the LCD display is divided into 24 sections. Each of them symbolizes 1 hour of the day.
Black rectangles above the timeline mean that the day temperature has been programmed for specific hours, and that there is no night temperature.

Example:

The figure above shows that from 6.00 A.M. to 11.00 P.M. Auraton Libra DS will control the heating device in such a way that the room temperature will be day temperature (S). AURATON Libra DS will switch to night temperature from 11.00 P.M. to 6.00 A.M. (T).

Factory programs

In order for AURATON Libra DS to know when to turn on the day and night temperatures, you should be set to an appropriate program for each day of the week. For this purpose, you can use one of the three factory programs (from 0 to 2):

Program no. 0 – anti-freezing U
Unmodifiable factory program. Designed for all-day anti-freezing temperature setting.

Program no. 1 – weekly
Unmodifiable factory program. Sets day temperature from 5:00 to 8:00 A.M. and from 3:00 to 11:00 P.M.

Program no. 2 – weekend
Unmodifiable factory program. Sets day temperature from 6:00 A.M. to 11:00 P.M.

Programs no. 3, 4,…., 8 – user-defined programs
Programs from 3 to 8 are user-defined programs. They can be freely modified and adapted to specific requirements.

Programming

Weekly programming

To program AURATON Libra DS, set the day temperature intervals for individual days of the week. At other time, night temperature will be set.

Sample AURATON Libra DS setting from Monday to Sunday. Outside the intervals programmed, the night temperature will be set.

Day	Day temperature
Monday	5:00 – 8:00 A.M.; 3:00 – 11:00 P.M.
Tuesday	5:00 – 8:00 A.M.; 3:00 – 11:00 P.M.
Wednesday	5:00 – 8:00 A.M.; 3:00 – 11:00 P.M.
Thursday	5:00 – 8:00 A.M.; 3:00 – 11:00 P.M.
Friday	5:00 – 8:00 A.M.; 3:00 – 11:00 P.M.
Saturday	8:00 A.M. – 11:00 P.M.
Sunday	8:00 A.M. – 11:00 P.M.

Program selection

To set the program:

1. Press the h key. Program number segment will start blinking.

   

2. Press the m key as many times as required to set the day of the week for the program.

   

3. Press the h key several times and select the program number requested. Programs 0-2 are factory-set, programs 3-8 can be edited.

   

4. Confirm selection pressing the ( key.
5. Repeat the procedure for the following days of the week.

Modyfying user-defined programs

To set the program:

1. Press the h key. Program number segment will start blinking.

   

2. Press the m key as many times as required to set the day of the week for the program.

   

3. Press the h key several times to select the program number required. Programs 0-2 are factoryset, programs 3-8 can be edited.

   

4. All (24) black rectangles will appear on the timeline. Each of them symbolises 1 hour. A visible rectangle indicates day temperature set for the given time. If no rectangle is displayed, night temperature is set.

   Blinking rectangle indicates the point of the timeline which is modified.

   

5. Press the r key to select day (rectangle on) or night temperature (no rectangle). Then, select the time interval for the temperature selected with the knob.

   

6. By pressing the r key and selecting time interval the entire program is modified.

   

7. Confirm selection with the ( key.

Manual control

V

Option 1:
If, for some reason, you want to stop the current program at a given moment and extend the day or night temperature, you can do it manually, but for not longer than 24 hours. To do this you should:

Hold the r button for 3 seconds. Then, using the knob, select the number of hours of manual operation (24 hours at the most) and confirm the setting using the ( button.

AURATON Libra DS will wait until you choose one of the two temperatures which it should maintain (day or night). The change is made by using the r button or the knob. Confirm the selection using the ( button.

Option 2:
If you want to suspend the execution of a given program, e.g. due to a party lasting longer than expected, but AURATON Libra DS has already started lowering the temperature for the night (the T symbol has appeared on the display), you should:
Press the r button, the display will show the symbols of a V and the S. The day temperature will then be maintained until the next temperature change carried out by the program.
To withdraw the above-mentioned action press the ( button. The r symbol will disappear from the display.

Similarly, if the program is using the day temperature but you want it to implement the night temperature immediately, you should:
Press the r button. The display will show the symbols of a V and the T. The night temperature will then be maintained until the next temperature change carried out by the program. To withdraw the above-mentioned action press the ( button. The r symbol will disappear from the display.

Anti-freezing temperature

U

In the event of being away for a long time, it is possible to turn on the anti-freezing temperature mode. It allows you to avoid the unpleasant consequences of water freezing in the heating system by automatically setting the temperature to 7°C. To set the anti-freezing program, simply select program 0 for the desired day of the week.

Resetting AURATON Libra DS

To perform a reset, remove the battery and wait until the data on the display disappears.

Master reset of AURATON Libra DS

MASTER RESET is performed by pressing and holding the ( button and at the same time installing the batteries. This causes AURATON Libra DS to return to its factory settings.

Configuration settings

Configuration settings are set one after another:

To enter the edit mode of the configuration settings, hold the h and ( buttons simultaneously for 3 seconds until the settings menu is displayed.

Heating mode/air-conditioning mode

AURATON Libra DS can work in two modes:

	Heating mode (preset) – set it if you want AURATON Libra DS to cooperate with heating devices.
	Air-conditioning mode – set it if you want AURATON Libra DS to cooperate with air-conditioning devices.

Turn the knob to the left or right to set the required mode. Confirm your choice by pressing the ( button. AURATON Libra DS will proceed to change the next parameter.

Changes in hysteresis

The hysteresis change mode is signaled by a flashing HI. Turn the knob to the left or right to set the desired hysteresis.
HI 2 – ±0,2 °C (preset),
HI 4 – ±0,4 °C,
HI P – PWM operating mode (see chapter “PWM operating mode”).

Confirm your choice by pressing the ( button. AURATON Libra DS will proceed to change the next parameter.

Changes in the delay

The delay prevents too frequent activation of the actuator, e.g. due to temporary drafts (caused by opening the window, etc.).

Offset change

Offset allows you to calibrate temperature indications with a tolerance of ± 3 °C. AURATON Libra DS may for example show that the temperature in the room is 23 °C, while a regular room thermometer next to it may show 24 °C. Changing the offset by +1 degree, will make AURATON Libra DS show the same temperature as the room thermometer.

Pr Off/Pr On

AURATON Libra DS has the function of emergency relay operation. In the event of too low battery voltage (indicator visible on the display), the user may decide to turn the relay off or on permanently.

In the AURATON Libra DS menu, you can select Pr OFF – relay permanently turned off or Pr ON – relay permanently turned on.

AURATON Libra DS will store these settings until new batteries are installed (low battery voltage indicator fades out).
If the external sensor is disconnected or damaged, two dashes will be displayed in place of temperature, and AURATON Libra DS will automatically switch to the anti-freeze mode.
In this case, install a new external sensor or reset AURATON Libra DS by removing the battery for a few minutes, which will cause AURATON Libra DS to switch to working with the internal sensor.

Clock calibration

This function is used to correct the clock indications in case of any deviations. If the clock is working incorrectly within a week, the extent of incorrect clock indications should be determined. This value should be entered in AURATON Libra DS in the form of seconds.

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

Example 2:
After a week of operation, the clock in AURATON Libra DS is 2 minutes slow (2 x 60 = 120). In this case you should speed up the clock by setting C 120.

PWM operating mode

 (Pulse-Width Modulation)

By changing the hysteresis settings (chapter “Configuration settings”), you can turn on the PWM operating mode. In this mode, AURATON Libra DS cyclically turns on the heating device in order to minimize temperature fluctuations. AURATON Libra DS checks temperature rise times and temperature drop times.

Knowing these values makes AURATON Libra DS turn on and off the heating device in appropriate cycles to maintain the temperature to the set value as close as possible.

External temperature sensor

AURATON Libra DS with an additional external temperature sensor

AURATON Libra DS equipped with an additional socket allows you to connect an external temperature sensor (2.5 m included). In order for the external sensor to be detected, connect it and install the batteries that came with the thermostat. After activating the AURATON Libra DS with an additional sensor, you can set the maximum temperature of the external sensor in the range from 10 to 55°C.
To check the temperature of the external sensor measured by AURATON Libra DS, briefly press the (, button, and measured value will appear and blink for 5 seconds.
With an additional external sensor connected, AURATON Libra DS will maintain the temperature according to the air temperature (internal sensor), and the heating will be switched on until the temperature is reached by one of the sensors.
A situation may arise whereby the heating is turned off because the temperature of the external sensor has been reached despite the air temperature (internal sensor) not having been reached.

1. External temperature sensor
2. Connection block

If the external sensor is disconnected or damaged, AURATON Libra DS switches to safe mode (dashes are displayed in place of temperature) resulting in the relay and, consequently, the controlled device to be turned off. To exit the safe mode, reconnect the external temperature sensor or restart AURATON Libra DS by pressing and holding the r and h buttons simultaneously.
Once this procedure is completed, AURATON Libra DS will again display the temperature from the internal sensor.

Additional remarks

• At least 30 seconds must elapse between switching the relay off and on again.
• AURATON Libra DS enables you to turn on or off the control functions at any time (e.g. after a heating season) by briefly holding down (for about 5 seconds) the ( button (AURATON Libra DS will only show the current time and room temperature – no “timeline”).
• Pressing any function button for the first time always turns on the backlight, and then the function of a specific button. 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.

The AURATON Libra DS connection schematics

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

Cleaning and maintenance

• The outside part the device should be cleaned with a dry cloth. Do not use solvents (such as benzene, thinner or alcohol).
• Do not touch the device when your hands are wet. It may cause 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.
• Keep the device away from liquids or moisture.

Technical specifications

Power supply:	2 x AAA (2 x 1.5 V), alkaline
Working temperature range:	0 – 45 °C
Signalling the working status:	LCD
Number of temperature levels:	2
Anti-freeze temperature:	7 °C
Temperature control range with the external sensor:	10 – 55 °C
Temperature measurement range:	5 – 30 °C
Hysteresis:	±0.2 °C / ±0.4 °C / PWM
Relay load capacity:	Max. 250 V AC, max. 16 A
Working cycles:	Weekly programmable
Level of security:	IP20
Dimensions [mm]:	90 x 90 x 36

Disposing of the devices

Hereby, LARS Andrzej Szymanski declares that the radio equipment type AURATON Libra DS is in compliance with Directive 2014/53/EU and 2011/65/EU. The full text of the EU declaration of conformity is available below in the download area.

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Contact and address of the manufacturer:
LARS, ul. Świerkowa 14
64-320 Niepruszewo
www.auraton.pl

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Download

• User manual
• Declaration of conformity