Question 1

How do the daily heating limit (Tagesheizgrenze) and the summer-winter switch (Sommer-Winter-Schaltung) work together on the Thision S PLUS?

Accepted Answer

On the Thision S PLUS, these two features work in complementarity to optimize heating according to a cascading system. The Sommer-Winter-Schaltung (summer-winter switch, line 730) is the main seasonal regulator that automatically switches the system each year according to temperature conditions. In winter mode, heating operates according to the defined programs and limits; in summer mode, only sanitary heating operates. This switching occurs automatically in Automatic mode and takes into account the smoothed outside temperature to adapt the building to thermal inertia. It only acts if you are not in 'Dauernd Komforttemperatur' (permanent comfort) mode.

The Tagesheizgrenze (daily heating limit, line 732) is a fine regulator that refines the daily operation of heating, complementing the seasonal switching. It only operates if winter mode is active (otherwise it has no effect). Its main role is to respond quickly to fluctuations in outside temperature during transition periods (spring and autumn). For example, with a comfort level of 22°C and a limit of -3°C, heating turns off at 19°C and turns back on at 18°C. This function prevents heating from operating unnecessarily on milder winter days.

The Verlängerung Tagesheizgrenze (line 733) parameter affects how the daily limit reacts to the restart of heating. If you choose 'Nein' (No), the daily limit only switches according to the current outside temperature. If you choose 'Ja' (Yes), it also takes into account the smoothed outside temperature (moving average), which extends heating cycles and offers more thermal stability.

In summary, the cascading operation unfolds as follows: first, the summer-winter switch decides if heating can operate year-round (coarse seasonal filter). Then, in winter mode only, the daily limit refines operation day by day based on actual temperature variations. This organization allows for combining seasonal energy savings with daily thermal responsiveness, without heating on abnormally mild days or wasting energy in permanent comfort mode.

Question 2

How to set the daily heating limit (Tagesheizgrenze) on the Thision S PLUS?

Accepted Answer

The daily heating limit on the Thision S PLUS is configured via the professional settings menu. Here is the exact procedure:

Accessing the configuration menu

Press and hold the INFO button for 4 seconds on the control panel.
Select “Service Level”.
Navigate to the “Heating” menu.

Locating the settings

Depending on your heating circuit, go to:

CC1 Circuit: Line 732 (Daily heating limit)
CC2 Circuit: Line 1032 (Daily heating limit)

Adjusting the value

Use the rotary knob to access the relevant line, then enter a value between -10°C and +10°C. The higher the value, the sooner the heating will stop in mild weather.

Additional setting

On the next line (733 for CC1 / 1033 for CC2), a setting “Extend daily heating limit” (Yes/No) allows you to extend or not the activation of heating beyond this threshold.

Practical tip

This limit acts as a daily filter: it prevents the heating from activating if the outside temperature exceeds the defined threshold, even in winter mode. It is particularly useful for reducing consumption on late autumn or early spring days.

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