Hkoenig BW1890 Manuel D'utilisation page 17

The PCB has the memory function, when you power on the cooler,
it memories the set temperate of last time.
The LED will default display the real temperature of beer, shows in
figure 20. You can see the set temperature by pressing "+" button 1
second, it will display the set temperature, and 3 seconds later, it
will recover and display the real temperature.
To pour the beer out by pulling down the tap mechanism, and
9.
you can adjust the pressure regulator knob to control the beer
flow rate and beer bubble;
Note: Clean the glass before pouring beer out; if the beer or beer
cup/glass is in high temperature or the beer is not cool enough,
there are many bubbles when pouring beer out;
When taping the beer, lean your beer glass against the pouring
10.
spout and slowly straighten it up with the beer rising, then open
the tap mechanism completely to avoid much bubble; It is
advisable to pour half-glass, make a short pause before
continuing the rest.
NOTES: Never immerse the pouring spout into the beer glass to
avoid much bubble; Remember to lock the tap after finishing
pouring.
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Figure 20