Cata GHI 6104 BK /A Instrucciones Para La Instalación, El Uso, El Mantenimiento página 43

GAS BURNERS
Gas is supplied to the burners by turning the switches. Although
the symbols change from model to model, they are indicated either
on the switches or the control panel. The following settings may be
conducted to match with the illustrated symbols.
1. Left lower burner control switch
2. Top left burner control switch
3. Top right burner control switch
4. Right lower burner control switch