The product is sold out and will no longer be delivered. Successor with the same display and smart functions via MQTT expected to be available in early 2025.

Digital Thermostat EL05

From the idea to the product

Based on our many years of experience in the field of individual room control, we have developed our own digital thermostat. During the development of the room controller, great emphasis was placed on important and useful functions. An in-house software development could offer corresponding flexibility. The room temperature controllers are electronic controllers in an elegant design for mounting in a concealed socket. Appealing in design, convincing in its handling and function. The Digital Thermostat is ideal as a temperature controller for water-bearing underfloor heating systems as well as electric heaters. The controller measures the room temperature with the internal one and closes the heating contact when the setpoint temperature falls below the setpoint. Alternatively, the external sensor can be used to control the ground temperature. The clear LCD display enables intuitive operation and creation of a daily program. The target value is divided into 24 hours in the daily program and can be defined independently for each day of the week. Many other functions as well as various parameters leave nothing to be desired.

Specifications

• Operating voltage: AC 230V
• Power consumption: <1W (VA)
• Switching current: max. 16A for actuators closed without power or electric heating
• Temperature sensor: NTC 10K25 air sensor
• Ambient temperature: 0...50°C
• Setpoint range: 10...30°C
• Temperature setting in steps: ± 0.1°C
• Switching hysteresis: adjustable up to max. ± 5°C
• Display accuracy: 0.1°C interpolated and averaged
• Clear LCD display with white backlight (dimmed after 2 minutes if no action)
• Data preservation in the event of a power failure
• Dimensions of housing: 86 x 86 x 42 mm LCD: 86 x 86 x 17 mm
• Protection class: IP20
• Room thermostat cannot be integrated into switch ranges
• Individual daily program (24 hours can be set separately for each day of the week)
• Mounting in flush-mounted box: horizontal or vertical mounting Ø 60mm

LCD display

The device has a clear and large LCD display with a white backlight. Already in the design, great importance was attached to intuitive operation via touch control. The display is clearly designed and the measured room temperature and the set set point can be determined at a glance. The display shows the minutes, the hours and the respective day of the week. There are 7 standalone daily programs that you can set.

The Digital Thermostat has a display accuracy of 0.1 degrees Celsius. If a power outage no longer supplies your household with energy, all your data will remain stored thanks to the backup battery. The thermostat can be used in different rooms of a house or apartment with protection class IP20. The room thermostat display is divided into 4 main areas:

1. In the header area, time and date information including the key lock are displayed. The day of the week and summer/winter time are automatically calculated based on the date you set. The automatic summer/winter time changeover can be activated or deactivated accordingly under Settings.
2. In the second area, the daily program with the temperature setpoint is displayed. The daily program is divided into 24 segments, which represents the 24 hours of a day. In total, the 7 working days make up the entire weekly program. When setting a setpoint, a distinction is made between a comfort temperature (for presence) and an ECO temperature (for absence). The comfort temperature can be set differently for each day of the week, but the ECO temperature is valid for all days of the week and can be changed under advanced settings. The Digital Thermostat is delivered from the factory with the following weekly program.
3. Below the daily program, the measured room temperature is displayed. In the right area, the Digital Thermostat displays the current status symbols. The division of the display thus enables an immediate reading of all relevant information.
4. The control buttons for controlling the room controller are shown in the footer area. There are a total of 5 buttons available that can be used to quickly make changes to the Digital Thermostat.

Digital Thermostat Features

Backlight

During operation, the backlight is activated with 100% luminosity. If there is no further button action after 2 minutes, the lighting is turned down. The strength of the dimming level can be adjusted in the settings between 0% and 40% depending on the requirements. The backlight can also be switched off completely within a certain time window, e.g. in order not to cause any light sources during sleep time in the bedroom.

Mode Choice

The room controller supports both heating and cooling modes. For the cooling mode, the cooling function on your heat pump must also be activated. The sense of action of the switching contact is then reversed to the heating mode.

Sensor selection

The room controller has a total of 3 different options as to which sensors should play a role in a control system.

1. Internal sensor - possible location: water-bearing underfloor heating with actuator
   The room temperature is recorded via the internally installed sensor. The external sensor is not needed and does not need to be connected.

2. External sensor - possible place of use Example: water-bearing underfloor heating with actuator
   The room temperature is measured via the external sensor. Depending on the requirements, the temperature can be recorded at a different location than the intended mounting location of the room controller

3. Internal and external sensor - possible location Example: Electric heater
   The room temperature is recorded via the internally installed sensor. The external sensor must be positioned in the floor area when using electric heating mats. The external sensor acts as a heat limiter and ensures that the heating is switched off from a certain floor temperature to prevent floor overheating and burning. It is imperative that the heating mats used include internal overheating protection.

Keylock

The key lock can be used to avoid unwanted changes to the settings by children or strangers. To activate the key lock, the power button must be held for at least 3 seconds when it is switched on. An active key lock is indicated by the corresponding symbol on the display or by the flashing symbol if someone tries to press any button.

Switching difference and sensor calibration

The switching difference can be used to define the deviation value from which the switching contact should be closed or opened. This can be used to define the size of the hysteresis in the heating system. Hysteresis results from twice the value of the switching difference.

The sensor calibration can be used to adjust the measured temperature value. Calibration should be carried out after 24 hours of continuous operation at the earliest so that final values are available.

Control mode

The room controller offers 2 control types to choose from:

1. Two-point regulator (recommended for water-bearing underfloor heating)
   A two-point controller is a proportional regulator and regulates according to the specified switching difference. If the room temperature falls below the set value and the switching difference, the switching contact is closed in heating mode. If the room temperature exceeds the set value plus the switching difference, the switching contact is opened in heating mode. Consequently, a hysteresis consisting of double the switching difference is used. A closed switch contact is represented by the active symbol "HEAT" in heating mode. The behavior in cooling mode is analogously inverting.

2. PI Regulator (Proportional-Integral Regulator)
   A PI regulator consists of 2 parts, a P part and an I part. The P portion is equivalent to the two-point controller described above and has a proportional effect. The I-component, on the other hand, does not have a fixed assignment between the setpoint value and the temperature deviation, but is also dependent on the duration of the deviation over time. The room controller tries to achieve the specified setpoint optimally, based on the PI algorithm. The PI parameters can be changed in the settings depending on the requirements.

Highlights

• Large LCD display with white backlight and touch buttons
• Clear display of the setpoint temperature and measured room temperature
• Displaying the time (minutes, hours, day of the week)
• Weekly program with 7 independent daily programs
• Temperature measurement adjustable by means of internal or external sensor
• Definition of comfort and ECO temperature valid in the daily program
• Data preservation in the event of a power failure through a backup battery
• Heating/cooling, switching difference, calibration, frost protection, display off at night, and much more.

Scope of delivery

• Digital thermostat EL05 white for water-bearing underfloor heating / electric heating
• external floor sensor (to be connected only with electric heating / simply omit with actuators) Ø5mm x 26mm, cable length 3m, NTC 10K25
• Instruction manual in German (see TAB Download)

Please note that the display has 2 screen protectors and the bottom film is almost invisible!

Room thermostat warning

Electronic consumers may only be installed by appropriately qualified personnel.