Ventilation profiles Vallo Plus 510MV

Hello,

quick question about the ventilation profiles in ventilation systems with heat recovery, because my profiles seem very strange to me:
We built new two years ago and now I have found out that you can also "read out" the Vallo Plus via internet connection. Now I have found the following values in the ventilation profiles.

When present:

Fan power 17%
Supply air: 15 degrees Celsius
Humidity: 69%
Heat exchanger status: Bypass

When absent:
Fan power 30%
Supply air: 15 degrees Celsius
Humidity: 69%
Heat exchanger status: Bypass

It can't be that the supply air is 15 degrees, right? Shouldn't it be higher?

Thank you very much for your info

It can't be that the supply air is 15 degrees, can it? Shouldn't it be more?

It should be, but unfortunately, the year 2021 ordered summer on Wish. Your heat exchanger is set to bypass, meaning the heat from the exhaust air is not transferred to the cooler supply air. Therefore, pure outside air comes into your house, and in our area, that has been roughly no more than 15-20 °C in the last few days. So at least for German conditions, the reading is accurate.

We have the Vallox 350. It looks the same there. With the bypass, the heat exchanger should not be active, if I understand correctly.

It should have, but unfortunately, the year 2021 ordered summer on Wish.

Your heat exchanger is set to bypass, meaning the heat from the exhaust air is not transferred to the cooler supply air. So pure outside air comes into your house, and in our area, that has been roughly around 15-20 °C over the past few days. So at least for German conditions, the display is accurate.

That's exactly what I don't understand. Why isn't the heat from the exhaust air transferred to the supply air? It would be great if 20 degrees were blown in instead of 16 degrees. With my ventilation system, I can control the temperature of the supply air. But the controller is set to 15 degrees.

Why is 15 degrees set there? I don't know Vallox, but to me it reads like a desired supply air temperature that controls the bypass. That means, if, as currently, the outside air matches the desired temperature, the bypass is activated so as not to warm it — because then it would be warmer than your desired temperature.

Try setting it to 22 degrees there. Does the bypass then open and the supply air is more strongly warmed by the exhaust air?