Building drying: Is it better to turn off the controlled residential ventilation system in summer?

Hello,

we want to dry our construction before moving in, and the screed is not yet ready for covering (CM:2.3).

We have 2 large construction dryers in operation. Should the already installed controlled residential ventilation system (Zehnder Q450) be turned off or run at maximum during the current temperatures? (Currently just under 20°C and about 80-90% humidity)

Or is it better to run it at maximum only in the evening/night when the air is cooler (at night around 10°C)?

Best regards, Barossi

I think that regarding dehumidification, it doesn’t matter at all whether your [Kontrollierte-Wohnraumlüftung] is running. At the level you are operating (30%), hardly any water is extracted from the air. Whatever still needs to be done, your building dryers can easily handle. If your humidity varies greatly from room to room, the [Kontrollierte-Wohnraumlüftung] could be turned on for circulation purposes; otherwise, I would turn it off, save energy, and enjoy the still clean filters.

I thought the controlled residential ventilation should only be switched on after the building drying, due to contamination and initially continuously humid air in the system ... this was already discussed somewhere.

Well, the house is no longer really damp, the screed is still acting up (CM: 2.3), and I wanted to support the dehumidifiers a bit with the [Kontrollierte-Wohnraumlüftung]. What else should happen except replacing filters due to dust. I just read that in summer the [Kontrollierte-Wohnraumlüftung] additionally brings moist air into the house.

I would not want construction dust in the piping system or even the heat exchanger. Take a look at the manual, there might already be a warranty exclusion there. I would at least cover all exhaust air vents separately with filter mats. Depending on the amount of dust, these would need to be changed very regularly.

I'm not worried about that, the work is completed, the floor has been vacuumed. We are only waiting for the drying of the screed. No more dust is generated. I wanted to supplement the dehumidifiers with the [Kontrollierte-Wohnraumlüftung].