ᐅ Decentralized Ventilation with Heat Recovery – Control Options?

Hello, I have a question about decentralized ventilation systems, like those from Lunos. These ventilation units exhaust air for a certain period and then blow air back in. Shouldn’t they actually be linked together so that some units are always exhausting while others are bringing air in? If they all blow air in or out at the same time, then (assuming the house is well-sealed) no air movement should occur, right? But from what I’ve seen, these units don’t seem to be interconnected. How does that work?

Controlled Residential Ventilation: Finding the Right Balance

Ventilation systems are based on demand-controlled airflow throughout the entire living area. Depending on the needs and humidity levels, fans exhaust air from the bathroom, kitchen, toilet, or laundry room to the outside or into exhaust shafts. This creates a slight negative pressure inside the living space. Due to this negative pressure, fresh, filtered air flows through the external wall air inlets into the living rooms, bedrooms, children’s rooms, and workspaces. Transfer openings in the doors ensure air circulation between the supply air and exhaust air areas. This results in a continuous supply of fresh air: first from outside into the living area, then into the exhaust rooms. This happens without noise, drafts, or pollutants. The prevention of drafts is ensured by wind pressure stabilization and volume flow limitation in the supply air components. Integrated sound attenuators also ensure that only fresh air, not noise, enters the house—even in busy urban areas. The volume flow is controlled by the moisture content and temperature of the air.

For the first time, demand-driven control of exhaust fans was equipped with a humidity-temperature sensor. This innovative regulation automatically adjusts the fan speed according to ventilation needs: depending on the relative humidity, the airflow rate increases or decreases. This ensures that ventilation is provided as much as necessary and as little as possible. The sensor, integrated in the intake area of the exhaust fan, measures both the temperature and humidity of the exhaust air volume. Since the fan is installed in the bathroom or toilet, where air conditions differ from those in the living area, simultaneous evaluation of temperature and humidity achieves fan control adapted to the air conditions in the living space. Thus, the control system considers not only the needs of the bathroom but also those of the living areas, effectively protecting against moisture damage and mold growth. The automatic annual timer switches the fan to the lowest setting during summer, and back to humidity control during transitional seasons and winter.

Mold can develop at relative humidity levels as low as 60%
Damp walls have reduced insulation performance

€uro will be happy to provide further explanations.
Source: Lunos

Kind regards

Hi, thanks for your post. Those are the inverters that have this regulated. But I haven’t found anything on this point regarding the Lunos. Am I correct in understanding that they don’t have any regulation?

Take a look at the installation manual under Downloads on the website.
There is a control unit where two cables lead to the fans.

Ahh! You’re right, it’s described there. So there is also a control system involved here. Thank you very much!!!

Hello,

DerBjoern schrieb:
Ahh! You’re right, it’s described there. So there is also a control happening here. Thank you very much!!!

Reading is educating 😉

Kind regards