ᐅ The children's bedroom is too warm in the new build.

The heating engineer has once again installed a system following the motto "As long as it gets warm." You are taking the first proper step!

AD1988 schrieb:

This is a Vaillant underfloor heating system.

Gas or heat pump?

guckuck2 schrieb:

Gas or heat pump?

It is a gas heating system.

Now that I’m looking into it, I also feel that everything is set up incorrectly. I understand and would keep the maximum flow temperature set at 35°C (95°F). However, I noticed that the minimum temperature is set to 25°C (77°F). Does this make sense?

I also saw that with a slope of 0.4 and an outside temperature of 5°C (41°F), the flow temperature should be around 30°C (86°F). Currently, it is already at 26°C (79°F) and the heating is still off.

AD1988 schrieb:

I understand that the maximum supply temperature is set to 35 degrees, and I would leave it that way.

Yes, please keep it like that. It’s possible that the heating-up program only ran up to 35 degrees or just slightly above. If now 50 degrees go into the underfloor heating, it could cause stress.
(That said, it’s safe to assume the heating technician ran the system thoroughly during the functional test )

AD1988 schrieb:

But I just noticed that the minimum temperature is set to 25 degrees. Does that make sense?

No idea. It might, depending on other settings. I’m not familiar with Vaillant. Maybe someone else here has the same Vaillant control unit. Otherwise, you could try asking in the pink forum.

It doesn’t sound entirely wrong. You start with a 25-degree supply temperature, heat energy is delivered to the room, and it returns at 20 degrees (a 5 K temperature difference). That’s roughly what you need to actually have a warming effect in the space. With a 20-degree supply temperature, you won’t warm a room already at 20 degrees any further.

AD1988 schrieb:

I just saw that at 0.4 and an outside temperature of 5 degrees, the supply temperature should be around 30 degrees. But currently it’s already at 26 degrees, and the heating is still off.

Yes, it should be slightly above 30 degrees supply temperature. Is there a hysteresis set?

guckuck2 schrieb:

Yes, the supply temperature should be just above 30 degrees Celsius (86°F). Is a hysteresis set?

If I knew what that was, I could check it.

So, the first night with the new heating curve is over, and everything is nicely warm except for the floor. However, this is okay. Yesterday, I found the calculations for the circuits.
But now I am unsure how to correctly set the flow rate.
Should only the affected circuit be opened, or all of them? I have noticed that the flow rate varies depending on how many circuits are open.