Koenig bw1880 Instruction Manual page 11

Do not
excess 90°
5. Close the top cover of the beer cooler; When pouring out the beer,
the turn the knob on the top cover to "+" position to release the CO2,
and turn it to "-"position when pause or stop pouring beer to close the
CO2. Please refer to the notice label on the top cover.
6. Turn on the power switch to "I" position to power on the beer
cooler. (While "0"position is to power off it).
NOTES: Please make sure your hands are dry when you operate
the beer cooler, to avoid electric shock.
Figure 15
Figure 17
Regulator
assembly
Cover
assembly
16g CO2
CO2 bottle sheath
Figure16
Figure 18