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
B
baschdieh23 Jan 2019 17:02apokolok schrieb:
Either the Netatmo is showing incorrect readings or the window is completely drafty, meaning there is almost no insulating effect between the panes.In the meantime, I measured with a conventional thermostat as well. The values regarding humidity were almost identical there too.
How can one check whether the window actually has a problem?
About the windows:
- Wooden double casement windows: 1.51 x 2.51 m (4.95 x 8.24 ft)
- U-factor: 1.3 W/m²·K (0.23 BTU/ft²·h·°F)
- Insulated glazing
- In front of the patio door, each room has the air supply from the ventilation system positioned centrally
Just measure the temperature at the window.
The glass must be very cold if water is condensing like that.
If you don’t have a suitable thermometer, you can simply do it by hand.
As a reference, you can use objects from known temperature ranges, such as a refrigerator, basement, or bedroom.
If the insulation is working properly, the inner window pane should be only a few degrees cooler than the room temperature.
The glass must be very cold if water is condensing like that.
If you don’t have a suitable thermometer, you can simply do it by hand.
As a reference, you can use objects from known temperature ranges, such as a refrigerator, basement, or bedroom.
If the insulation is working properly, the inner window pane should be only a few degrees cooler than the room temperature.
B
baschdieh25 Jan 2019 09:26apokolok schrieb:
Just measure the temperature at the window.
The glass must be very cold if water is condensing like that.
If you don’t have a suitable thermometer, you can simply use your hand.
As a reference, you can compare to objects with known temperature ranges, like a refrigerator, cellar, or bedroom.
If the insulation works properly, the inner glass pane should only be a few degrees cooler than the room temperature.So the glass is ice cold at the bottom – clearly much colder than the room temperature. That means the glass or the window is the problem?
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