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baschdieh21 Jan 2019 16:02Hello 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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nordanney21 Jan 2019 16:16How cold are your windows for water to condense on them? That’s really surprising!
Maybe the problem lies with the windows. They should actually have only a slightly lower temperature on the inside than your bedroom.
Maybe the problem lies with the windows. They should actually have only a slightly lower temperature on the inside than your bedroom.
At 25% humidity and with such windows, it is more likely that the windows are faulty...
A humidity level of 25% indicates that a heat exchanger is unfortunately missing, but it also shows that the system is probably working.
You can check this precisely by placing a CO2 monitor in the room; in the morning after waking up, the level should be below 1500 ppm to confirm that the system is functioning correctly.
A humidity level of 25% indicates that a heat exchanger is unfortunately missing, but it also shows that the system is probably working.
You can check this precisely by placing a CO2 monitor in the room; in the morning after waking up, the level should be below 1500 ppm to confirm that the system is functioning correctly.
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baschdieh21 Jan 2019 17:19@nordanney: I haven’t measured the glass itself yet, as I don’t have the proper device for that.
@Lumpi_LE: I have one of those Netatmo gadgets – at night the CO2 level rises up to 2200 ppm and only drops once we’re all awake. So the device ventilates the room every 2-3 hours, bringing the level down to 400-500 ppm.
@Mycraft: The windows are fogged up – that actually creates condensation. The photo was taken over the weekend when the outside temperature was -8°C (17.6°F).
@Lumpi_LE: I have one of those Netatmo gadgets – at night the CO2 level rises up to 2200 ppm and only drops once we’re all awake. So the device ventilates the room every 2-3 hours, bringing the level down to 400-500 ppm.
@Mycraft: The windows are fogged up – that actually creates condensation. The photo was taken over the weekend when the outside temperature was -8°C (17.6°F).
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