Product Features | Eve Thermo

Eve Thermo: Understanding and adjusting Temperature Offset

Oct 27, 2022 - by Lars - Comments
 
 

Eve Thermo relies on the proven technology of Hessian specialist Eurotronic for heat regulation, which works in the heating controllers of many leading smart home providers. Leveraging HomeKit as well as Eve technologies, Eurotronic's drive and control algorithm ensure comfort and efficiency. This makes saving energy easy. 

 

We're introducing you here to a hardware feature important for heat regulation: The adjustable Temperature Offset.

 

The problem

In environments where the location of Eve Thermo is significantly warmer or colder than the centre of the room (for example, because the heat is trapped behind a radiator panel or the valve is operating near a poorly insulated exterior wall), there may be a discrepancy between the actual room temperature and the value measured by the thermostat. To mitigate this, Eve Thermo gives you the option to set the Temperature Offset, effectively a local calibration.

Set the offset

The first step is to determine the offset. You'll get a workable value when Eve Thermo is active and the room temperature has stabilised. So wait until the Eve app shows a sufficiently flat trajectory of the grey target temperature line in the Eve Thermo detail view's temperature graph for the last two to three hours. Now read the temperature of a thermometer placed in the centre of the room at table height (NOTE: You may use a HomeKit temperature sensor like Eve Room for this purpose. However, this sensor cannot communicate with Eve Thermo. It therefore can’t work as an external sensor and replace the built-in one. The only way it can interact with Eve Thermo is through HomeKit Automations, via the Home Hub.).

 

To enter the correction value, open Eve > Settings > Devices > [Eve Thermo] > Temperature Offset. As described in the app, determine the offset to be set by subtracting the temperature set on the valve from that in the room. 

 

(temperature in centre of room in °C) - (target temperature Eve Thermo in °C) = offset in °C

 

Example 1: The room is 21°C, the Eve Thermo target temperature is 19°C, the offset is 2°C.

 

Example 2: The room is 22°C, the Eve Thermo target temperature is 23,5°C, the offset is -1.5°C.

 

TIP: Verify the correction value from time to time, for example when you have adjusted your comfort temperature or your schedules. And especially if the outdoor temperatures have changed significantly.

Read target and room temperature in Home

The offset stored in Eve is only taken into account by Eve Thermo's control algorithm. It is not passed on to the various temperature displays. HomeKit therefore only reads the uncorrected sensor reading. This value is displayed in the device tiles of the Favourites and Rooms views with a coloured circle underneath (green when heating is inactive, red when heating is active), and it is found averaged with other temperature data in the Quick View for Home and Individual Rooms. These user interface elements cannot be customised or hidden. 

 

The target temperature is displayed as a status in the Favourites or Room Devices tile of each Eve Thermo. If the valve is closed, the status is "17° Off", if Eve Thermo is active, Home reports "Heating to 24°". 

Read target and room temperatures in Eve

The Eve app also displays the uncorrected ambient temperature as determined by Eve Thermo. There are two reasons for this: First, this is the only way to ensure consistency with the numbers displayed by Home and Siri. And secondly, the information corrected by Temperature Offset is only an approximate value, which can be more accurate when the valve is open and the environment is warm than when the room has cooled down and the valve is closed. The sensor data, on the other hand, is concrete and therefore the only figure that can be compared and displayed.  

 

The detail view for Eve Thermo in the Eve app contains all the important information to monitor and manage the efficient temperature control of a room.

 

The current ambient temperature detected by the device is marked with a thermometer/heater icon and is shown to the left above the graph showing the gradients of the ambient (grey) and target (blue) temperature. A yellow radiator icon will also be displayed above the graph when Eve Thermo is currently heating. A stopwatch can be seen right next to the temperature control buttons when a schedule is active.

The ambient and target temperatures displayed, as well as the status of the device, sometimes may appear contradictory at first glance. Heating may be taking place although the target temperature (with calculated offset) has already been reached or even exceeded according to the sensor reading. Or: The valve may be closed although the target temperature (with calculated offset) has not yet been reached. In most cases, this is expected behavior, since Eve Thermo tries to keep the target temperature as constant as possible with the help of its control algorithm, with minimal movement of the actuator and even using external influences (sunlight, night cooling, etc.). This often involves the valve being open, even if only slightly.

 

TIP: If and when the valve has actually opened or closed, you can also check in retrospect, because you get even more insight into the operation of Eve Thermo if you tap Edit in the detailed view at the top right and add the view "Valve". This way you can compare the ambient and target temperature curves with the valve's behaviour afterwards. Do the readings increase when the schedule changes to comfort temperature? Do they remain as constant as possible over the duration of the comfort phase? Do they drop when the setback temperature is activated? If all this is true, then both Eve Thermo and your individual settings are working!

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4 Comments
Thomas
Hallo Volker, da die Zielwert-Temperatur dicht an der Heizung gemessen wird, schaffe ich es nicht, die Differenz groß genug zwischen Zielwert und gewünschter Raumtemperatur einzustellen. Auf bei leicht geöffneten Ventil erwärmt sich sich der Ventilbereich zu stark. Es wird somit trotz der Tagespläne nie geheizt. Ich verstehe nicht, wie ein Eve Room nicht eingebunden werden kann. Was kann ich tun; vielleicht finde ich den Kniff nicht. danke für einen Linke oder die Antwort .
Reply
Mar 5, 2023
Hallo Thomas! Nach der Installation und Kalibration in der App Eve nehmen Sie bitte einmalig die Grundeinstellung vor.

Wichtig: Die unter Temperatur Zielwert angezeigte Temperatur in Eve ist von Eve Thermo viel zu dicht am Heizkörper gemessen, bitte ignorieren Sie den Wert. Auch wenn die Temperaturabweichung gesetzt ist, wir der Wert nicht in die Darstellung eingerechnet.

Um Eve Thermo einzustellen öffnen Sie die App Eve und gehen zu
Einstellungen > Geräte > Eve Thermo
Stellen Sie die Temperaturabweichung auf 0 Grad.

Dann öffnen Sie in Eve Räume > Eve Thermo und öffnen Eve Thermo.
Stellen Sie Temperatur Zielwert auf zum Beispiel 23 Grad und heizen für 2-3 Stunden.
Messen Sie dann die in Raummitte erreichte Temperatur mit einem Thermometer, Eve Degree oder Eve Room.
Wenn hier zum Beispiel 20,5 Grad erreicht werden, gehen Sie in Eve zu
Einstellungen > Geräte > Eve Thermo und stellen die Temperaturabweichung auf -2,5 Grad.

Es ist möglich, dass Sie den Wert über die folgenden Tage nachstellen müssen.
Wie schon gesagt, wird die gewählte Temperaturabweichung nicht in den Wert der angezeigten/gemessenen Temperatur eingerechnet.

Ist das geschehen, nutzen Sie bitte die Funktion Zeitplan für das heizen, lesen Sie dazu bitte auch unseren Blog:
​https://www.evehome.com/de/blog/zeitplaene-anwesenheitsbasierte-steuerung-smart-heizen-mit-eve-thermo
Viele Grüße, Volker
Reply
Mar 6, 2023
Anton
Hallo, wie genau erkennt Eve Thermo, ob der eingestellte Zielwert erreicht wurde, wenn doch der gemessene Temperaturwert nicht für die Berechnung herangezogen wird?
Sinn hätte für mich ergeben, wenn der „gemessene Temperaturwert - die Temperaturabweichung = Zielwert ergibt.
Reply
Dec 29, 2022
Hallo Anton!
Nach der Installation und Kalibration in der App Eve nehmen Sie bitte einmalig die Grundeinstellung vor.

Wichtig: Die unter Temperatur Zielwert angezeigte Temperatur in Eve ist von Eve Thermo viel zu dicht am Heizkörper gemessen, bitte ignorieren Sie den Wert. Auch wenn die Temperaturabweichung gesetzt ist, wir der Wert nicht in die Darstellung eingerechnet.

Um Eve Thermo einzustellen öffnen Sie die App Eve und gehen zu
Einstellungen > Geräte > Eve Thermo
Stellen Sie die Temperaturabweichung auf 0 Grad.

Dann öffnen Sie in Eve Räume > Eve Thermo und öffnen Eve Thermo.
Stellen Sie Temperatur Zielwert auf zum Beispiel 23 Grad und heizen für 2-3 Stunden.
Messen Sie dann die in Raummitte erreichte Temperatur mit einem Thermometer, Eve Degree oder Eve Room.
Wenn hier zum Beispiel 20,5 Grad erreicht werden, gehen Sie in Eve zu
Einstellungen > Geräte > Eve Thermo und stellen die Temperaturabweichung auf -2,5 Grad.

Es ist möglich, dass Sie den Wert über die folgenden Tage nachstellen müssen.
Wie schon gesagt, wird die gewählte Temperaturabweichung nicht in den Wert der angezeigten/gemessenen Temperatur eingerechnet.

Ist das geschehen, nutzen Sie bitte die Funktion Zeitplan für das heizen, lesen Sie dazu bitte auch unseren Blog:
​https://www.evehome.com/de/blog/zeitplaene-anwesenheitsbasierte-steuerung-smart-heizen-mit-eve-thermo
Reply
Dec 31, 2022
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