Automation of a controlled residential ventilation system (ventilation system)

Hello everyone,

I am currently struggling again with the warm weather in the apartment (yes, unfortunately there is no [Kontrollierte-Wohnraumlüftung]). When I am at home, I try to ventilate vigorously whenever it is cooler outside than inside, even if it is only a 1-2 °C temperature difference. And when it is warmer outside, everything is shaded and the windows remain closed.

Of course, this approach clearly reaches comfort limits. If you want to stay in a room, ventilating at the same time is not always so pleasant. You also don’t want to leave the windows open all day if you are not at home or if it gets warmer during the day.

My question now to all experts and owners of central ventilation systems: Can [Kontrollierte-Wohnraumlüftung] be set exactly the way a rational ventilation behavior would look if you did it yourself? So, during heat, ventilation 0 when it is warmer outside, and vigorous ventilation when it is cooler outside. Of course, then also without heat recovery. In winter, of course, it’s different, ventilation rather during the day when the temperature difference is smaller; ventilation at night when it is very cold outside less/no ventilation.

I think it is clear what I am getting at. Can these systems be automated to this extent or is that too much to expect?

Thank you.

That really depends on the system and the control behind it. A simple time management can actually always be set. In summer, ventilate more at night/morning than at midday. However, temperature is not everything; it's also about fresh air. For that, you actually have a controlled residential ventilation system.

If you now really want to include real-time temperatures inside and outside, humidity, CO2 levels, and other features into an intelligent calculation, then it will already go in the direction of KNX. You need sensors that provide values, logic for the calculations, and a controlled residential ventilation system that can be controlled with external logic.

That also works initially without any problems without KNX. My Zehnder Q350 has a summer bypass and controls everything automatically, without KNX. It detects temperature and humidity for all 4 air types and then regulates accordingly and based on the selected settings. Very comprehensive.

Which system is installed?

Which system is installed?

(yes, unfortunately there is no controlled residential ventilation).

Ventilation systems with automatic summer bypass already come very close to what is desired. Otherwise, the manufacturers also have complementary system accessories in the form of various types of sensors. KNX is not necessarily needed there.

You should not expect miracles from this either. The houses are designed to retain heat. Our house certainly won't get cold from just a bit of air.