Hello everyone,
we are planning a prefabricated house using timber frame construction. It will have 180 sqm (1,937 sq ft) of living space with underfloor heating, and about 230 sqm (2,475 sq ft) of usable area.
So far, the offer included an air-to-water heat pump from Daikin (Altherma 3R, formerly Rotex HPSU compact Ultra).
Now it seems that this unit might not have enough capacity (?) and as an alternative (additional cost around 4,000) we have been offered a "Wolf heat pump CHC Monoblock 10/300-35".
The Daikin is available in the 4-9 kW version—would that really be insufficient for this size? And what do you think about this offer?
I have the energy-saving regulation heat protection certification and a renewable energy heat law document available, if any information from those is needed.
Thank you very much!
Best regards
we are planning a prefabricated house using timber frame construction. It will have 180 sqm (1,937 sq ft) of living space with underfloor heating, and about 230 sqm (2,475 sq ft) of usable area.
So far, the offer included an air-to-water heat pump from Daikin (Altherma 3R, formerly Rotex HPSU compact Ultra).
Now it seems that this unit might not have enough capacity (?) and as an alternative (additional cost around 4,000) we have been offered a "Wolf heat pump CHC Monoblock 10/300-35".
The Daikin is available in the 4-9 kW version—would that really be insufficient for this size? And what do you think about this offer?
I have the energy-saving regulation heat protection certification and a renewable energy heat law document available, if any information from those is needed.
Thank you very much!
Best regards
Deliverer schrieb:
Ah, he is supposed to do the balancing with the room valves fully open, and you want the reports!Is it really possible to require this, or are there any legal regulations regarding the "valve position"?
D
Daniel-Sp26 Aug 2021 11:06The valves are adjusted during the hydraulic balancing process so that the previously calculated flow rates are achieved when the actuators are fully open. This serves as the basic setting. In subsequent heating periods, the thermal balancing follows. Here, the flow rates are further adjusted based on the difference between the actual and desired room temperature. The actuators of the ERR partially interfere significantly with this setup in underfloor heating systems. This is particularly relevant when aiming for low supply temperatures and can often lead to cycling systems with rapid wear and premature failure of the compressor, especially in heat pump installations.
OWLer schrieb:
Our unit has arrived. 🙂The same model was installed here a few days ago and fully connected today. 🙂
The electrician particularly praised the cooling function, or at least spoke very positively about it, saying he is very happy with his own unit at home.
We probably won’t need the cooling function in the coming months, but now winter can come. 🙂
I’m curious to see how it performs.
netuser schrieb:
The electrician especially praised the cooling function or at least highlighted it positively, saying he is very satisfied with his system at home. Today I happened to have a conversation with one of the neighbors who has the exact same system. When I asked about the cooling function and his experience with it, he said that the cooling function has not been activated yet. The installer said that it can only be activated after the warranty period expires!?!?!? I could only raise my eyebrows... Unbelievable.
D
Deliverer14 Sep 2021 10:30netuser schrieb:
The installer said that these can only be activated after the warranty period expires!?!?!? He must have confused that with the self-destruct mechanism... ;-)
Seriously though: Every owner of such a system should definitely make sure they know how to change ANY setting themselves. Whether they actually do it or not is another matter. But eventually the system gets old, and no one can guarantee that the active service technicians will still be able to access the installer mode. So, you should keep bothering the manufacturer until you get installer access. Sometimes the codes can also be found online.
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