GE Monogram ZDP36N4R - Manual (Page 16)

Dual-flame
burners All burners on the cooktop have two separate
flames: a simmer (lower) flame and a main
(upper) flame.
Simmering: Use simmer (SIM) to melt
chocolate, hold delicate sauces or for other
foods requiring low simmer heat.
Primary Cooking: Settings from LO to X-HI
will use both the main and simmer flames.
Use LO to HI for all purpose cooking. Use HI
or X-HI (highest setting) with 10
″ or larger
diameter cookware.
Main Flame
Simmer Flame
Primary Cooking
Simmer Flame
Simmering
16
Surface Cooking
Stainless Steel Range