Hello dear forum,
We are using a Zehnder ComfoAir Q350. Unfortunately, it has had some issues with the "installation" from the start. First, the wrong settings were applied, and then the interior doors were too airtight. After the ventilation technician visited about five times since summer, it is now running reasonably well. Although the air quality in the bedroom still feels as if we have no ventilation, according to the technician everything is set up correctly.
Now that the weather has turned quite cold recently, we have noticed significant condensation on the windows in some areas. Especially in the bedroom and also in the open living-dining area. The technician said this is normal in a new building – however, due to the ventilation system and underfloor heating, we only have about 25% humidity. With an additional humidifier (Venta), we manage to reach almost 40%.
Question: Shouldn’t a ventilation system automatically remove moisture inside the house and prevent the windows from fogging? Is it possible that the ventilation system is still not correctly adjusted? How can something like this be tested?
Information about the picture:
- Bedroom (16 m² (172 sq ft))
- Room temperature approx. 18-19°C (64-66°F)
- Two adults and occasionally a toddler (2.5 years)
- 1x supply air (Zehnder)
Thank you very much!
Bastian
We are using a Zehnder ComfoAir Q350. Unfortunately, it has had some issues with the "installation" from the start. First, the wrong settings were applied, and then the interior doors were too airtight. After the ventilation technician visited about five times since summer, it is now running reasonably well. Although the air quality in the bedroom still feels as if we have no ventilation, according to the technician everything is set up correctly.
Now that the weather has turned quite cold recently, we have noticed significant condensation on the windows in some areas. Especially in the bedroom and also in the open living-dining area. The technician said this is normal in a new building – however, due to the ventilation system and underfloor heating, we only have about 25% humidity. With an additional humidifier (Venta), we manage to reach almost 40%.
Question: Shouldn’t a ventilation system automatically remove moisture inside the house and prevent the windows from fogging? Is it possible that the ventilation system is still not correctly adjusted? How can something like this be tested?
Information about the picture:
- Bedroom (16 m² (172 sq ft))
- Room temperature approx. 18-19°C (64-66°F)
- Two adults and occasionally a toddler (2.5 years)
- 1x supply air (Zehnder)
Thank you very much!
Bastian
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baschdieh21 Jan 2019 20:33@xray107 : This one was the worst. I proactively called the carpenter again. He adjusted the window once more earlier. Maybe it wasn't sealed well enough.
I also have the problem on the upper floor, but only slightly in the corners of the windows.
Maybe the issue isn’t with the HVAC system at all, but rather with the windows not being airtight. Perhaps a blower door test would help?
I also have the problem on the upper floor, but only slightly in the corners of the windows.
Maybe the issue isn’t with the HVAC system at all, but rather with the windows not being airtight. Perhaps a blower door test would help?
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baschdieh21 Jan 2019 21:07Zaba12 schrieb:
Isn't the blower door test done before moving in?No idea – we haven't done one so far.Zaba12 schrieb:
Isn't the blower door test usually done before moving in?It’s not always mandatory.
Under the 2016 Energy Saving Regulation, it is often no longer offered. Then you have to arrange it yourself.
baschdieh schrieb:
No idea – we haven’t had one done so far.That’s actually not very funny.
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baschdieh21 Jan 2019 21:32ypg schrieb:
It’s not always mandatory.
With the 2016 energy saving regulations, it is often no longer offered. You then have to arrange it yourself.
However, it’s not really that funny.What do you mean by that? Is it absolutely necessary? My architect didn’t tell me that I needed it. So we didn’t do it.
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