Junkers WRP11 B23 Gas Flow Regulation: Adjusting Screw, 42L/Min to 38.5L/Min, Water Heating Issue

Hello
I have such a short question that I have not yet found an answer to.
I have already cleaned the soot coil several times because the water does not heat up properly.
I wanted to adjust the gas flow, and confirm whether this is the screw responsible for the regulation of the expenditure.



Is regulation just where the seal?
If so, whether screwdriving is a limitation adjustment and turning to increase the output, because sometimes the opposite is true
I measured the flow and came out to me 42 l / min in these stoves should be 38.5 l / min with the deviation of 10% is already reportedly regulated.
And now the most important question, I turned the screw screwing it by 7/8 turn and with 42l / min it got 40l / min or continue to spin or leave it alone? It would result from the fact that I would have to turn from 6/8 turn to get 38.5l / min. I know that it should be adjusted depending on the pressure on the stub pipe, but I can not check this pressure.
I also increased the holes for 250 cm2 in the sound to increase the air flow ... Which is evidently noticeable.


ps. I noticed yet that in the middle burners the yellow fire is not blue and is so compact what is the reason?

greetings
Sebek

Screwing in the screw is to reduce the gas flow. This, however, should regulate the SERVICE, and especially should not be turned around, as the oring can wipe off and then ... gas will escape. Such adjustment - if necessary - should be done ONCE (after installing the stove).

The yellow flame on the burner is caused by the lack of air during gas combustion. You need to clean the burner very thoroughly from dust. Especially at the inlet nozzles of the injectors. Compressed air or after boiling a strong stream of water. Termy review is really not expensive and the service technician will do all of it.

Hello
Thanks for the information...
We do not care about the ring, you can always change it This can be showered with shaving foam or gray soap and see if something escapes.
As for the flame I have already done is low and blue, I cleaned the burners with a brush, undressed, rinsed the red domestos with water and blew them with air, dried with a hairdryer.
They look like this:



I checked 3x the expense I have exactly 38.5l / min, i.e. gites and I am heapy.
All I wanted to do, good God bless good people ...

greetings
Sebek