ᐅ Underfloor heating with an air-to-water heat pump. House gets too warm when the sun is shining.

Created on: 4 Dec 2019 14:18

Hello everyone,

I have a general question.

We moved into our new build four months ago. The living area on the ground floor has three large floor-to-ceiling windows facing south. We have underfloor heating and an air-to-water heat pump.
It provides a really comfortable temperature inside the house, but we have a problem – whenever the sun is shining in winter, even if it’s -2°C (28°F) outside, the temperature suddenly rises to 24°C (75°F) in the living room. It gets uncomfortably warm in here, and the underfloor heating can’t be turned down quickly.
Should we assume that the large floor-to-ceiling windows are responsible for the heat gain? A photo of the south-facing side of the house is attached.
What would you do – always lower all the blinds as soon as sunlight is forecast? That seems quite annoying...
We have motorized blinds controlled by Somfy. Would you consider buying a sensor that automatically lowers the blinds at a certain temperature?

Thanks in advance for your replies.

Neues zweistöckiges Haus auf Baustelle mit weißer Blockfassade, pinker Dämmung und großen Fenstern

chewbacca12315 Dec 2019 09:18

#139

Daniel-Sp schrieb:

Actuators are the white parts on top of the heating circuit manifold. You should remove them carefully. Otherwise, they might suddenly close the heating circuit. But for the heat pump, you need a continuous flow in the heating circuits. You set the room temperature once via the flow rate, and that should remain constant. With ERR, it looks like in the picture (I just googled it quickly) — look at the top graph. The red and blue curves represent the supply and return lines, the dark green VD1 is the compressor that keeps switching on and off. Please compare this with the graph from a few days ago from my heat pump and consider which operation mode is gentler on the equipment and which heat pump will last longer.

Okay, I’ll take a look at that later. So, just remove those caps?
Our heating engineer is coming again this week... but I don’t really expect him to improve anything. I will definitely do it myself, otherwise it won’t work out.
So, after all the adjustments and the heating curve: 27-21-0,
it’s still too cool at 20.3°C (68.5°F) in the bathroom and living room. I think the whole heating circuit needs to be reset. Do you know how to adjust the volume flow? Just turn the black caps on top?

Daniel-Sp15 Dec 2019 09:50

#140

About to leave for the Christmas train, will check in this afternoon.

chewbacca12315 Dec 2019 10:18

#141