Depends on the exact model. Smart or dumb, Some dimmers can be set for on/off, some can’t.
so very true… The dimmers I had are older Leviton dimmers, they are a toggle with a slider. The slider clicks at the top and sets it at a simple on / off mode.
I know I am late to the party here, but I found the manual (install and quick start) on the website nutone.ca. I’ll try to add a links. http://nutone.ca/product-detail.asp?ProductID=11223
Quick Start: nutone.ca/PDF/NWT00Z_Quick_Start_Guide_EN_FR.pdf
These were still live 6/2020.