ᐅ Underfloor heating supply temperature 20 degrees? Return temperature? Solar support?

Hello.
Maybe someone can give me some advice.

My new underfloor heating system raises a few questions.
- Flow temperature only 20°C (68°F)??? KfW 70 new build with solar support. Return temperature also 20°C (68°F)?
The surface temperature (laminate) is between 23 and 21°C (73 and 70°F)!
The heat meter shows consumption.
The thermostatic valves are set to 20°C (68°F).

- A glass tube in the manifold box appears to be empty of water.
All the others show a water level!

Apparently, a balancing was done during inspection. According to the installer, the heating system should be set correctly.
Supposedly no further action is needed. Only regulate via the room thermostat...

I’m at a loss...

The flow temperature should depend on the outside temperature. The colder it gets, the higher the heating curve will be.
In my opinion, all your valves are fully open, as the float is at the top everywhere.

Doesn't that mean the circuits are closed?

This makes sense to me. The set temperature is 20 degrees Celsius (68°F), and the room is above 20 degrees Celsius (68°F) (otherwise, the floor temperature wouldn’t be over 20 degrees Celsius (68°F)), so the RTR is "closing," meaning the valves are "closing." There is no need for heating, so the supply line remains close to the room temperature.

UPS sorry.... yes, of course, the flow rate is showing 0.0 everywhere. For testing, turn all room thermostats fully up; then the float valves should move down after a short time.

Musketier schrieb:
UPS sorry.... yeah, of course, the flow rate is showing 0.0 everywhere. For testing, turn all room thermostats fully up, then the floats should move down after a short time.

Thanks for your tip!

Am I understanding the underfloor heating system correctly? This is my first one...

So, if I set the room thermostats above 20 degrees Celsius (68°F) — then a light turns on — the supply temperature must increase. The liquid in the tubes should then drop, causing the float to move down.

The more I open the room thermostat, the more the float drops, as it indicates the flow rate.

How can I test if the balancing is correctly set?
I received a suggestion (not yet tried) to turn all thermostats fully up and measure the room temperature.
If it seems too high, slightly restrict the heating loop for that room.
Test each room like this...
Then set all the room thermostats back to zero.

Regards