Smeg CE92CMX - Manual (Page 10)

Instructions for the User
38
DOUBLE HEATING:
Using these knobs it is possible to control the double cooking zones of
the hob. The burner controlled is indicated below every knob.
The heating within the smaller circle is adjusted in the same way as a
cooking zone with normal heating. To activate heating in the outside
zone, turn the knob clockwise, lining up with the or symbol.
Releasing the knob will return it to the maximum position for both the
zones (inside + outside). To return heating to only within the inside
circle, first turn the knob to the O position and then turn it to the desired
power.
To turn off the burner, turn the knob to the O position.