Question about everyday life with a controlled residential ventilation system

I also wouldn’t know that this is the case – how should a controlled residential ventilation system know that? There are no pressure difference sensors in the systems.

At least not in the standard installed ones – what he has implemented there with KNX, I don’t know.

You can open windows, this certainly doesn’t mess things up with systems from Zehnder, Helios or Danair (those I know).

By the way, I am of the opinion that tilted window ventilation does have some effect – at least here in the transitional room we currently have two windows tilted open, which creates a draft – unlike what is often said. In winter, the cooling effect is different, but one shouldn’t always generalize immediately.

Well, even the simplest controlled residential ventilation system knows when the filters are clogged... it does not use differential pressure switches, but rather determines the pressure differences simply through the power consumption of the fans.

If you are deep enough into the system’s settings, you can usually even see the pressure differences live on the display. With my system, it is also possible, for example, to create an over- or underpressure in the house, which the system then maintains... although it is only a few Pa, nevertheless.

Without constant monitoring of the pressures, the controlled residential ventilation system would not function according to the specifications at all. Calibration would also be pointless.

And if that were the case, what would be so bad about leaving a window open? It would then be a temporary constant state - or are you no longer allowed to go through a patio door or even open the front door for a chat?

Especially with EC motors, you hardly have any wear...

By the way, I don’t see any pressure indicators on the Helios, only rotations.

That's the way it is, you can believe that.

? Then it's a temporarily constant state

Exactly, that's the problem. By leaving a window open overnight/day, you create a state that lasts for hours, deviating from the "usual" setting. So why even send technicians and have everything calibrated? You could just leave all the valves 100% open. The system will regulate itself, right?

With short-term changes (open terrace door), the systems handle it wonderfully within the hysteresis, how long it can last, of course, only the manufacturer knows. But over hours... then they start compensating, which results in increased wear and tear and also higher electricity bills.

Especially with EC motors, you hardly have wear...

Yeah, tell that to the bearings inside... they don't really care how the motor is driven... and they eventually break too... of course faster under increased load.

Of course, you can also greatly exaggerate with such views...

No, I'm not exaggerating... I'm just explaining how it works...