ᐅ Are the ventilation settings correct? - The electricity consumption seems quite high.

Hello, I have taken a closer look at the settings of our Vallox 350 MV system.

First, I increased the supply air temperature from 15 to 20 degrees Celsius (59°F). Vallox mentions 15 degrees Celsius (59°F) as the optimal value in the manual. Why is that? Does the air otherwise need to be heated electrically if this value is not reached?
The system settings also showed 15 degrees Celsius (59°F) for the supply air temperature, but according to the images, the supply air was set to 20 degrees Celsius (59°F). Something doesn’t seem right here.

Additionally, I raised the relative humidity limit from 48% to 55%, as the air felt quite dry, according to the graph.

I lowered the CO2 limit to 900 ppm.

I also reduced the fan power from 40% to 35%. The system became noticeably quieter, which surprised me given the small change.

What do you think about the other settings shown in the pictures?

Since the system’s electricity consumption seems quite high to me, the adjustments aim to save energy—of course without compromising the system’s intended function.

@Pinkiponk: what is there to like about this questionnaire? 😳 Great screenshots or great questions asked? 😀

driver55 schrieb:

@Pinkiponk: what is there to like about this list of questions? 😳 Great screenshots or great questions asked? 😀

I find the question interesting, even though I can’t answer it, and I look forward to the responses from forum members who know about this. Also, I think a “Like” is a friendly welcome and a way of saying, “Nice to have you here.” :-)

You have now changed some target values and hope to have invented the "magic pentagon."
I don’t know your system, but some of the changes contradict each other. Don’t assume it works the way you imagine.

Tx-25 schrieb:

Why is that? Does the air need to be heated electrically if the value is not reached?
The system settings also showed a supply air temperature of 15°C (59°F). According to the pictures, however, the supply air was at 20°C (68°F). Something doesn’t add up there.

Here I give you @driver55’s standard advice, if he doesn’t want to give it himself 😉

Instruction manual for conditions!

Tx-25 schrieb:

Does the air need to be electrically reheated if the target value is not reached?

Yes, that is correct.

Tx-25 schrieb:

Vallox stated an optimal value of 15°C (59°F) in the description. Why is that?

Because then no electrical reheating is required, and the air is warmed afterwards by the existing heating system, which is more efficient and cost-effective.

Tx-25 schrieb:

According to the pictures, the supply air was at 20°C (68°F). Something doesn’t add up there.

Yes, that’s because your heat recovery is working and warming the air. The 15°C (59°F) should be considered a limit value for colder outdoor temperatures than are currently the case.

Tx-25 schrieb:

The system’s electricity consumption seems very high to me,

How is that being measured and over what time periods?