[Solved] Understanding Re-Pressurizing Process for Junkers Euroline ZS23-1: Valve Functions

Hi,
I'm having difficulties understanding how re-pressurizing for this model works.
Usually, I have seen a black valve or blue key for similar models, but this one has none.

Is the valve circled in orange for this? It connects cold water with water coming back from heating.
If not, I have attached some additional images.



I appreciate any input.

You can let water into the central heating using this valve.

That's right, the valve marked on the floor is used to replenish water to the central heating system. This boiler does not have a handle because it is a single-function boiler designed to work with an external tank. It is worth checking the pressure in the expansion vessel because you can see leaks from the safety valve under the boiler on the left side.... Speaking of photos, Polish standards do not allow the gas meter to be placed so close to the heating device... but it is customary in every country.

Thanks, it was the correct valve and the it successfully got re-pressurized.