Controlled Residential Ventilation & Heat Pump: Viessmann vs. Vaillant vs. Zehnder?

2022-11-24 15:08:52

In your filter box, you can either have a pre-filter and then the activated carbon filter, or only activated carbon, or even completely different ones. There are several filter classes; the higher the number, the finer the filter. Only a coarse filter (G2 or G4) comes into the outside air. Then, before entering the [Kontrollierte-Wohnraumlüftung] (usually installed in the [Kontrollierte-Wohnraumlüftung]), you can add a "medium" filter (M5). Then comes the supply air filter (F7), which is, for example, for pollen and is normally also installed in the [Kontrollierte-Wohnraumlüftung]. Usually, the activated carbon filter comes after the F7 filter in the supply air.

This is stated on the homepage where your box is offered: Replacement filter activated carbon AK is for (or rather against) kitchen odors, car exhaust, paint odors, fits in the small "drawer" of the ISO filter box Replacement filter activated carbon AL is for (or rather against) agricultural odors. Fits in the small "drawer" of the ISO filter box

2022-11-24 17:28:28

That’s embarrassing for me now, I had searched the whole page and even googled it :rolleyes:, shame on me! Thanks for your effort!!!

Thank you very much for your explanations, they help me enormously!! If I now apply what you wrote to the controlled residential ventilation of Viessmann with the mentioned additional filter box, it sounds like this to me (viewed from outside to inside):

Outside air means the pipe that goes from outside into the controlled residential ventilation and thus first leads into my filter box. Here you put a G2 or G4 filter in front of the activated carbon filter, so as a first contact filter :). Then the activated carbon filter. Now we come into the controlled residential ventilation; here the M5 filter would come next and after that the F7 filter.
Could the M5 filter be omitted in this setup, what do you think?

You write that the activated carbon filter usually comes as the last filter behind the F7. Do you think the activated carbon filter is less effective in my variant?

With this additional filter before the controlled residential ventilation, the controlled residential ventilation itself has nothing more to do and is that maybe not so good for it? Somehow sounds like more effort...

2022-11-24 18:59:18

I'm a bit embarrassed now, I searched the whole page and even googled it :rolleyes:, shame on me! Thanks for your effort!!!

Thank you very much for your explanations, they help me enormously!! If I now translate what you wrote to the controlled residential ventilation system from Viessmann with the said additional filter box, it sounds like this to me (viewed from outside to inside):

Outside air means the pipe that wants to go from outside into the controlled residential ventilation and thus first leads into my filter box. Here you place a G2 or G4 filter before the activated carbon filter, so as a first contact filter :). Then the activated carbon filter. Now we get into the controlled residential ventilation, here the M5 filter would come now and after that the F7 filter.
Could the M5 filter be left out in this constellation, what do you think?

You write that the activated carbon filter actually comes as the last filter behind the F7. Do you think the activated carbon filter is less effective in my version?

With this additional filter in front of the controlled residential ventilation, does the controlled residential ventilation itself no longer deal with it and is that perhaps not so good for it? Somehow sounds like more effort...

Not less effective, no, less "lifetime," yes, because a G2/G4 still lets through too much dirt so that the filter mat clogs faster.
I would set it up like this [Outside air -> G2 or M5 at the intake of the controlled residential ventilation -> controlled residential ventilation -> F7 filter in the controlled residential ventilation at the supply air outlet -> activated carbon filter box]

That's how I did it back then (just as a rough direction), my box on the right side is my G2 filter box, yours should be to the left with the activated carbon filter

2022-11-24 19:20:25

Oh, you wouldn’t connect the box to the outside air but to the supply air! Right?

So like this: Outside air - M5 (in the controlled residential ventilation) - F7 (in the controlled residential ventilation) - activated carbon (in the box) - supply air into the ducts

Where the topic of insulation and sheet metal box comes up again, would it even need to be insulated then? It would actually only come into contact with the temperature that would also lead into the ventilation ducts, right?

2022-11-24 19:57:58

Exactly, but as I said, you can also use G2/G4 instead of M5, because every filter increases the back pressure. That means higher fan speed, ergo more consumption, ergo possibly a size larger controlled residential ventilation system because the required air volume can no longer pass through the filters. Therefore, one should clearly communicate what one might plan later on.

2022-11-25 14:00:04

I hope that at our prefabricated house manufacturer someone is actually doing any calculations at all for the heating and [Kontrollierte-Wohnraumlüftung]... Sometimes I feel like they still live in their own bubble and have stopped time in it...

An [Kontrollierte-Wohnraumlüftung] that is too small is no good because then it just blows itself dumb and silly. Can you also take one that is too big? Because that's exactly what I suspect, we always have both the heating and the [Kontrollierte-Wohnraumlüftung] offered one size bigger, but I have no idea if that's necessary. Can I roughly check that myself by rule of thumb? From the building application I at least have the cubic measurements of the floors, isn't that decisive for that?

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Controlled Residential Ventilation & Heat Pump: Viessmann vs. Vaillant vs. Zehnder?

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