Underfloor heating air-water heat pump. House too warm when the sun shines

Hi Daniel,
is it enough to have an evaluation to meaningfully visualize the data in a graphic or should certain time periods be considered?
Best regards, Ina

The program opendta automatically visualizes the last 48 hours. You can zoom in on sections and deselect or add any parameters. You can best upload a screenshot here.

I am reading along with interest here and have an additional question for the heating experts: If you fully open all Err and set all Topmeter to max flow, meaning fully open, can you then actually do without closing the bypass valve? In principle, it should then no longer come into use, right?

If your system provides enough volume flow for the heat pump and no one can just close the ERR heating circuits (remove actuators! and take them off power - also saves some money), then why take the risk of a thermal short circuit????

As a layman, I am not sure, I believe completely closed is also not possible. At the highest settings, it only opens at such a high pressure difference that it is practically closed.

The bypass valve is only needed when heating circuits are frequently shut off and thus the total volume flow collapses. Then it protects the system from too high pressure. However, at the cost of efficiency because the heat pump continues to produce heat but this does not reach the screed. The result is a faster temperature increase in the return flow and cycling of the heat pump.

Additionally, the bypass valve is set "for safety reasons" (postulated use of the ERR) to open much too early, and very often, even with an undamped underfloor heating system, there is still a partial flow through the bypass valve. So it is better to check the total flow rate and close the bypass valve.

Can't one just do the following (if the ERR and actuators are on a separate circuit) replace the actuators with normally open ones, and then simply remove the fuse?