ᐅ Controlled residential ventilation & heat pumps: Viessmann vs. Vaillant vs. Zehnder?
Created on: 23 Nov 2022 14:12
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Nixwill2Hello everyone,
I want to revisit a topic that was mentioned a while ago in another thread but deserves a more detailed discussion, as it turns out to be more complicated than anticipated. Here’s our situation, and I would really appreciate hearing about your experiences. Starting with the background.
We are currently building a prefabricated house (timber construction) with a prefab home manufacturer. The plot is located in a small village, in a very old part of town. It seems like almost everyone heats with wood there. On our property, there is a wood smoke smell throughout the entire winter (we noticed this last year already, and it’s happening again this year), as if there is a campfire burning nearby non-stop.
Now, we are seriously concerned that with a mechanical ventilation system with heat recovery (MVHR), the indoor air could end up smelling the same as the outdoor air, which we definitely want to avoid. To counter this, we thought about installing a mechanical ventilation system with an activated carbon filter included. That’s why we have tentatively selected the Zehnder ComfoAir Q350 TR in the enthalpy version, since both of us already occasionally suffer from dry eyes. This system also comes from the factory with attachments for activated carbon filters.
Unfortunately, things turned out differently than expected. The house supplier is hesitant in initial discussions and is postponing the topic until the customization meeting in December. The reason given: they only work with Viessmann or Vaillant because the heat pumps come from those manufacturers. More precisely, it would be either the Viessmann Vitovent 300W or the Vaillant recoVair VAR360 ventilation system. Neither of these original systems offers a solution with an activated carbon filter.
Now to my main question. What’s your opinion on this? Our concern is not unfounded, and an F7 pollen filter doesn’t seem to be an adequate solution for this situation, does it? They immediately said that an F7 filter would be sufficient, but we don’t believe that.
Is it possible to install a Zehnder mechanical ventilation system alongside a heat pump from Viessmann or Vaillant, or not?
I don’t want to assume the worst-case scenario, but do you have any ideas on how to solve this problem if the house provider doesn’t allow any other mechanical ventilation system?
I would be very grateful for any ideas, experiences, or tips!
Best regards
Nixwill2 schrieb:
And what would you insulate in a metal box and why?Because air passes through to the outside temperature. In winter, this often leads to condensation.
It depends on where you would install it, but it should always be fully insulated from the outside, for example in the outdoor air supply, before the mechanical ventilation with heat recovery, using Armaflex to prevent condensation (which should also be applied to the rest of the piping [outdoor air + exhaust air]). After the mechanical ventilation, use aluminum-laminated mineral wool, 30mm (1.2 inches). There should also be a G4 pre-filter in the outdoor air supply (this is usually located inside the mechanical ventilation unit, but it’s important because you don’t want coarse dirt reaching the activated carbon filter).
The manufacturer and filter brand don’t matter, as they are all produced according to DIN standards.
The manufacturer and filter brand don’t matter, as they are all produced according to DIN standards.
OWLer schrieb:
Because air passes through at outside temperature. In winter, it often condenses as well. But this cold air also passes through the polystyrene box and can cause the same issues there, right?
How is the mechanical ventilation system protected without that filter box in front of it?
Dogma schrieb:
It depends on where you would install it, but always insulate completely from the outside, for example on the outdoor air side, before the mechanical ventilation system, using Armaflex to prevent condensation (which should also be used on the rest of the ductwork [outdoor air + exhaust air]). After the mechanical ventilation, use 30mm (1.2 inches) aluminum-coated mineral wool insulation. There should also be a G4 pre-filter on the outdoor air side (this is usually located inside the mechanical ventilation unit, but that won’t help you since you don’t want coarse dirt to reach the activated carbon filter).
The manufacturer doesn’t matter, and neither do the filters, as they are produced according to DIN standards. Sorry, I saw your message too late! The filter information is definitely interesting—thanks for the tip! I was already wondering why there are two filter slots (one 40mm (1.6 inches) and one 94mm (3.7 inches)). So, does that mean I put the G4 filter before the activated carbon filter? Would that allow me to skip the original filter inside the mechanical ventilation unit, or is the idea here “the more the better”?
Do you know what the abbreviations AK and AL mean on the activated carbon filters?
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