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 21:37Zaba12 schrieb:
Sample: Do you have a KfW55 house or better? No – we built a standard house according to the 2016 Energy Saving Ordinance.
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nordanney21 Jan 2019 22:07baschdieh schrieb:
@nordanney : I haven’t measured the pane itself yet, as I don’t have a device for that. You can feel it by hand.baschdieh schrieb:
No – we built completely according to the Energy Saving Ordinance 2016.And do you have a KfW loan?
To my knowledge, it is then required. You show the financing bank that the Energy Saving Ordinance has been complied with.
If not, you would have reported something incorrectly.
Putting that aside, the BDT indicates where there are issues on the house.
But I am not completely sure.
I would not take it lightly, especially considering your shocking photo.
I see the need for action in many areas, even if it is not mandatory.
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baschdieh22 Jan 2019 08:54No, we have not used a KFW loan.
First of all, thank you very much for all your responses – I have now discussed this with my architect, so let’s see what they say.
Last night, I monitored the bedroom again using my "Netatmo" station. It clearly shows that the built-in ventilation system does not effectively remove the rising CO2 levels or humidity, which I find quite strange:
First of all, thank you very much for all your responses – I have now discussed this with my architect, so let’s see what they say.
Last night, I monitored the bedroom again using my "Netatmo" station. It clearly shows that the built-in ventilation system does not effectively remove the rising CO2 levels or humidity, which I find quite strange:
baschdieh schrieb:
does not ventilate away the rising moisture – which I also find very strange At which setting is it running? The basic setting here is only designed for building protection. If there are several people in the house, it needs to be at the next level.
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baschdieh22 Jan 2019 10:30ares83 schrieb:
Which level is it running at? The basic level in our case is only designed for building protection. When several people are in the house, it needs to be at the next level.The system is running in automatic mode and is always around 160 m³/h (190 cubic yards per hour).
According to calculations:
Ventilation for moisture protection: 48 m³/h (63 cubic yards per hour)
Reduced ventilation: 112 m³/h (146 cubic yards per hour)
Nominal ventilation: 160 m³/h (190 cubic yards per hour)
Intensive ventilation: 208 m³/h (272 cubic yards per hour)
The Zehnder system was set to the following values:
Away: 50 m³/h (65 cubic yards per hour)
Level 1: 115 m³/h (150 cubic yards per hour)
Level 2: 160 m³/h (190 cubic yards per hour)
Level 3: 210 m³/h (275 cubic yards per hour)
For a few days now, the display suddenly shows: Frost Disbalance – could this mean something?
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