CONTINENTAL EDISON BCT-0588D Guide D'utilisation page 30

5. Put 800ml water into the cooling cavity or pour the water to the
max mark (As shown in Figure 3). (It can work without water, but
it can't display the best performance)
Make sure the drain switch is at "OFF" position, and no extra objects
in the cooling cavity (As shown in Figure 4).
The max water level line
(about 800ml)
Figure 3
The drain switch
is closed
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Figure 4