Bosch PSY626B21E Montageanleitung Seite 6

B: loosen the by-pass screws until the gas flow from the
burners is correct: when adjusting the control knob between
maximum and minimum, the burner does not go out, nor is
there a flame backdraught created.
C: the by-pass screws need to be changed by an authorised
engineer.
D: do not touch the by-pass screws.
All valve reinforcing rings must be in position to ensure
watertightness. These devices are essential for the correct
operation of the appliance as they prevent liquids and dirt from
entering the appliance.
Refit the control knobs.
Never remove the tap spindle (Fig. 8). In the event of a
malfunction, change the whole tap.
Caution!
After finishing, the sticker indicating the new type of gas must be
placed close to the specifications plate.