ᐅ Controlled residential ventilation / DIBt-certified stove / pressure monitor
Created on: 16 Jul 2013 09:23
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PhoenixDH
Hello everyone,
we are planning to build a prefabricated house meeting the KfW 70 standard.
The house will be heated primarily with a gas/solar (water) system, partly with underfloor heating and partly with conventional radiators.
In addition, a controlled residential ventilation system with heat recovery will be integrated.
We also want to install a stove, since the heat from a stove has a different character.
I am familiar with the technical requirements from my chimney sweep.
This means the stove must be room-air independent and ideally certified by DIBt.
However, as is often the case, the stove we have chosen is room-air independent but does not have DIBt certification.
According to my information, a pressure monitor must then be installed, which shuts off the controlled ventilation system if the negative pressure becomes too high.
My question now is: what does such a pressure monitor look like and how is it installed?
Where does it measure? I assume in the room where the stove is located, but where else?
Does it measure outside? If so, how can I route the sensor outside?
Retrofitting a penetration to the outside later would be problematic due to airtightness concerns.
Can someone bring me up to date on this?
By the way: the range hood will be recirculating and can be disregarded.
Thank you very much!
we are planning to build a prefabricated house meeting the KfW 70 standard.
The house will be heated primarily with a gas/solar (water) system, partly with underfloor heating and partly with conventional radiators.
In addition, a controlled residential ventilation system with heat recovery will be integrated.
We also want to install a stove, since the heat from a stove has a different character.
I am familiar with the technical requirements from my chimney sweep.
This means the stove must be room-air independent and ideally certified by DIBt.
However, as is often the case, the stove we have chosen is room-air independent but does not have DIBt certification.
According to my information, a pressure monitor must then be installed, which shuts off the controlled ventilation system if the negative pressure becomes too high.
My question now is: what does such a pressure monitor look like and how is it installed?
Where does it measure? I assume in the room where the stove is located, but where else?
Does it measure outside? If so, how can I route the sensor outside?
Retrofitting a penetration to the outside later would be problematic due to airtightness concerns.
Can someone bring me up to date on this?
By the way: the range hood will be recirculating and can be disregarded.
Thank you very much!
M
mongobongo21 Oct 2013 08:50Unfortunately, this only applies to the sweeping. The official district chimney sweep is always responsible for the inspection, and you cannot choose who it is.
Since we are currently at this stage as well (the stove is being delivered today), here are our experiences.
We have an LAS chimney and a stove with DiBT approval. These are tested up to 12 Pa negative pressure.
As far as I know, a malfunction of the mechanical ventilation with heat recovery (MVHR) can cause a higher negative pressure.
So either install a pressure monitor or use an “intrinsically safe mechanical ventilation system.”
Since the MVHR installed in our case is intrinsically safe, we can do without the pressure monitor.
According to the manufacturer’s written statement (which our chimney sweep requests), the MVHR is intrinsically safe because:
We have an LAS chimney and a stove with DiBT approval. These are tested up to 12 Pa negative pressure.
As far as I know, a malfunction of the mechanical ventilation with heat recovery (MVHR) can cause a higher negative pressure.
So either install a pressure monitor or use an “intrinsically safe mechanical ventilation system.”
Since the MVHR installed in our case is intrinsically safe, we can do without the pressure monitor.
According to the manufacturer’s written statement (which our chimney sweep requests), the MVHR is intrinsically safe because:
- Through automatic weekly calibration, an excessive pressure difference between supply and exhaust air is detected and compensated.
- In case of a technical defect in the supply air fan, the unit completely switches off.
- The frost protection function (heat exchanger defrost) does not switch off only the supply air but both supply and exhaust air.
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PhoenixDH25 Oct 2013 10:37wadi1982 schrieb:
Since we are currently at this point as well (the stove is being delivered today), here are our experiences.
We have a LAS chimney and a stove certified by DiBT. These are tested up to 12 Pa (0.05 inches water column) negative pressure.
As far as I know, a malfunction of the controlled residential ventilation system can create a higher negative pressure.
So, either install a pressure monitor or use an “intrinsically safe controlled residential ventilation system.”
Since the controlled residential ventilation we have installed is intrinsically safe, we can do without the pressure monitor.
According to the manufacturer’s written statement (requested by our chimney sweep), the controlled residential ventilation is intrinsically safe because:
- An automatic weekly calibration detects and compensates for excessive pressure differences between supply and exhaust air.
- In case of a technical fault in the supply air fan, the unit shuts down completely.
- The frost protection function (defrosting the heat exchanger) does not shut off the supply air only, but both supply and exhaust air.
Thank you!
I can now confirm this after further consultation with our chimney sweep and providing the operating manuals, etc.
wadi1982 schrieb:
Since we are currently at this stage as well (the stove will be delivered today), here are our experiences... This is not really operating experience, but more about the "handling"! As a rule, the installation room is an "air supply room"! Negative pressure due to external combustion air supply should not occur here, even if the mechanical ventilation system is, for example, inoperative due to a technical fault.
From a technical point of view, direct combustion air supply through wall or floor penetrations (LAS) is usually second choice compared to a separate combustion air supply system. I know that LAS sellers see this differently.
A mechanical ventilation system is not “play equipment,” especially in well to highly insulated buildings. The air volumes per room significantly impact the heating loads of the rooms and therefore the sizing of heating elements and operating parameters (ventilation rate, temperature difference, hydraulics).
The commissioning report with suitable measuring instruments is therefore of great importance.
Payments to the mechanical ventilation installer should be made contingent on this!
Best regards.
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PhoenixDH12 Jan 2014 18:54Since this question is still pressing on my mind:
Are there any recent experiences from the past few weeks from people who have just had an inspection?
Because I would rather avoid having a box like that in the living room next to the stove.
Or does anyone have direct experience with this exact system: Vaillant recoVAIR 273 or 350?
Are there any recent experiences from the past few weeks from people who have just had an inspection?
Because I would rather avoid having a box like that in the living room next to the stove.
Or does anyone have direct experience with this exact system: Vaillant recoVAIR 273 or 350?
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