Will have to wait till I get ahold of a Torx 20 screwdriver. I do remember 7 years ago I had the electrician set it for 40 amps.
My version uses dip switches not a rotary dial. In our users manual there is pencilling indicating which dip switch setting he used. Choices were 12, 16, 24, 32, 40, 64, and 80. Our circuit being 50 Amp, we set it to 80% or 40 Amps.