ᐅ How to Perform a Hydraulic Balancing of a Radiant Floor Heating System Yourself?

Hi,

we have been living in our newly built house for a year now, so I thought it was time to optimize the underfloor heating for this second winter.

There are two heating manifolds on two floors, each with several heating circuits. Some of them are controlled by actuators and electronic radiator regulators (ERR), others are not. Overall, the ground floor tends to be slightly too warm, and the upper floor a bit too cool.

I understand the basic concept of balancing: open everything, lower the heating curve, and then fine-tune. But how do I do this precisely?

• Topic "Opening everything": Where I have room thermostats, I set them to the maximum. This causes the associated actuator on the heating manifold to open the circuit. But I also have circuits without actuators. Do I need to open these as well? Do I just remove the orange cap and loosen the screw with a wrench (see photo)? Do I need to do anything with the flow meters in this process?
• Topic heating curve: How do I handle this for the two floors? There is only one heating curve. Do I turn everything up at both heating manifolds on ground and upper floors at the same time, or do I proceed floor by floor?
• Topic fine-tuning: In the end, do I close the circuits where necessary that I opened under point 1), or do the circuits stay open, and the adjustment is done via the flow meters (this would make more sense to me)? So, at the end, do I have permanently open circuits that I adjust with the flow meters / flow rate?
Can anything go wrong if I open everything fully?

Thanks a lot!!