You can put the cassette in yourself, no problem. Why should the heat exchanger get damaged if it’s stored in a box instead of in the heater? As long as no pets or kids mess with it ;)
We have pets and a child at a dangerous age, I’m a bit scared. :D Maybe store it in the attic. But it gets melting temperatures there in summer.
Regarding the bypass, the question is whether one is installed or not. Since you also have a compact unit, possibly not.
We have the THZ 504, which is apparently identical to the 504 from Stiebel Eltron. Unfortunately, I don’t know whether there is a bypass installed, I can try to look it up and see if I can make sense of the technical terms. In the menu, there are settings for both "summer cassette" and "bypass." One of these can’t make sense at the same time, right?
Tecalor is, as far as I know, the no-name brand of Stiebel Eltron. That’s why the menu navigation is pretty much the same as ours.
Not necessarily "no name," but I think SE is only allowed to be installed by certain companies or something like that. Anyway, during our commissioning the technician from SE was also at our house, and when we asked him if the device was comparable to the SE 504, he said something like, “Comparable? It’s exactly the same, just a different label.”
Regarding summer operation, I would check the values again. At the moment, it’s too warm inside. But if you reach a tolerable temperature level inside, it might otherwise happen that the heating switches on during a cold night, even if it’s 30 degrees again during the day.
What do you mean by that? I am currently experimenting to achieve a tolerable temperature level during the day. If I don’t change anything on the system, the indoor temperature will not change either as long as the heat exchanger is off — "no heat lost." I have sent a message to our plumber with this question.
[*]Don’t let heat into the house. There are three measures for this: avoid direct sunlight through windows = shading, and don’t let hot air in = keep openings closed, turn off the heating.
[*]Provide active cooling
Thank you. We will try shading in the coming days and try to get used to it.
Not letting hot air in presumably means turning off the ventilation during the day in summer.
At the moment, that can’t really be our problem, since it’s still cooler outside than I want it inside. Our problem is that it’s 20° outside, but 28° inside.
What I can’t really explain is where the warm air keeps coming from. Yesterday we turned on the AC for the first time — which of course works, but we had planned to use the AC in summer, not from the first ray of sunshine. When we went to bed yesterday, it was quite bearable. But this morning, the bedroom was already boiling hot again. Where is it coming from? Are we radiating so much heat? In winter, that was definitely not a problem. The sun didn’t shine yesterday or today the whole day. WHERE is the heat coming from again? O.o
That’s why kudos to electric blinds (or similar) with a sun sensor. These roll down to 80%. This keeps most of it out while still letting in enough light.
We didn’t consider that back then — I would build it differently today.
Where is the house located?
Something just doesn’t make sense here in principle. In one case, the heating was running until two weeks ago (also a new build because of ventilation system), and here it’s already 28 degrees inside.
What kind of “high-tech huts” do you have?
The house is in northern Germany. It’s cool and rainy outside. It’s a KFW55 standard house. That’s why I’m wondering if something is off here / where the heat is coming from.
Exactly, all that should be planned in the new builds. Primarily, only the “winter” (heating) is taken into account, the “summer” (shading/cooling) is ignored.
That’s true. This was never really discussed with the construction company beforehand either. I’m glad my husband insisted on having an AC. But airtightness is really only talked about for winter. In summer, you imagine it like: “I just don’t let warm air in, and it stays cool inside” — nope, that doesn’t work.
@kati1337
Try to turn on passive cooling.
Which of the settings would you choose? I can select between “Off,” “Supply air,” “Exhaust air,” “Bypass,” and “Summer cassette.”
20 degrees outside and 30 degrees inside? How about manually airing out for half an hour? I think even in a new build it should be possible to open all windows, right? ;)
Possible, yes, desirable, no. :D
To open all windows, I’d first have to get insect protection. I only have that partially. But I’d rather have heat inside than bugs.
Okay, strictly speaking, I don’t want either inside, but bugs are worse.
I think we really need to tackle that more. But there must be a way to get rid of the ventilation’s heat recovery in summer. We probably have to buy a summer cassette.