Hello everyone, we have a Vallox unit 350 SC. I have a few questions about the settings. Unfortunately, the hotline couldn't help me. Even consulting the field service technician didn’t lead to any answers. Apparently, this person knows even less about the device than I do.
Does anyone here have a Vallox unit and can tell me if it has a bypass installed and whether it operates automatically? When I access the device, I can see at the bottom that I can turn the bypass on and off. It is currently set to on. What puzzles me, however, is the following: Looking at the supply air, room air, and exhaust air, I assume the bypass is not working. When we had 33°C (91°F) outside, temperatures of 27°C (81°F) were being delivered into the house during the day. Is this a result of the bypass reducing the temperature from 33 to 27 degrees? Or is this simply due to normal heat recovery?
Also, what does the 15° (59°F) temperature setting mean for the different ventilation modes? The controller can be set anywhere from 5 to 25° (41 to 77°F). What effect does this have?
Does the (existing?) bypass need to be deactivated in winter? Thank you very much for your feedback.
Does anyone here have a Vallox unit and can tell me if it has a bypass installed and whether it operates automatically? When I access the device, I can see at the bottom that I can turn the bypass on and off. It is currently set to on. What puzzles me, however, is the following: Looking at the supply air, room air, and exhaust air, I assume the bypass is not working. When we had 33°C (91°F) outside, temperatures of 27°C (81°F) were being delivered into the house during the day. Is this a result of the bypass reducing the temperature from 33 to 27 degrees? Or is this simply due to normal heat recovery?
Also, what does the 15° (59°F) temperature setting mean for the different ventilation modes? The controller can be set anywhere from 5 to 25° (41 to 77°F). What effect does this have?
Does the (existing?) bypass need to be deactivated in winter? Thank you very much for your feedback.
Tx-25 schrieb:
Yes, I have exactly the same interface. What temperature setting do you have in ventilation mode? Was it also preset to 15 degrees for you?
Unfortunately, I don’t have a network connection near the device, so I can only access the interface very poorly. We have the supply air set to 21°C (70°F). I don’t remember what the factory setting was. The information from Rotor that there is also "cooling recovery" was new to me. I had assumed that the 21° means the bypass activates from that point on.
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Allthewayup17 Aug 2024 22:28Tx-25 schrieb:
Does anyone here have a Vallox unit and can tell me if it has a built-in bypass and if it operates automatically? When I access the device’s controls, I see an option to turn the bypass on and off. It’s currently turned on. What puzzles me is this: looking at the supply air, room air, and exhaust air, I assume the bypass is not working. When it was 33°C (91°F) outside, temperatures of 27°C (81°F) were being supplied into the house during the day. Is that temperature drop from 33 to 27 degrees due to the bypass? Or is it simply the normal heat recovery process? We also have a Vallox 350MV-E, and I had to study the system myself because the company that installed it seemed a bit “overwhelmed.”
So, regarding the bypass function: when it’s enabled (which I’d recommend only in the summer), the heat exchanger is bypassed until the supply air reaches the set temperature. For example, if the bypass is set to 22°C (72°F), and it’s 4:00 a.m. in July with the supply air temperature (meaning the outside temperature) at 17°C (63°F), the ventilation system sends that air around the heat exchanger directly into the building. This creates a cooling effect in summer—hence the term “summer mode.” Conversely, on a hot July day, when the outside temperature is 33°C (91°F), the heat exchanger operates normally so that the 24°C (75°F) “cool” exhaust air from inside helps to lower the temperature of the 33°C (91°F) incoming air. Of course, all this only works within certain limits, and after three days above 30°C (86°F), it doesn’t matter much because it’s hot both inside and outside. But this is to say your bypass seems to be functioning as intended.
Regarding the operating modes, I can’t say much since I haven’t tested them yet. The menu in the web interface isn’t always easy to understand, but combined with the user manual, it should be manageable, right?
*Edit:
I often turn off the ventilation during the day in summer to avoid pulling too much warm air into the house. As I said, above around 30°C (86°F) outside, the indoor temperature inevitably rises.
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