I save instructions. I have before me a Nutone model 9427P, L,F,H. It shows a 3-function control with 2 separate 3-wires to the unit. There are 7 wirenuts shown in the unit's 'peckerhead' , or whatever it's called.
Note 3 ( out of 9) reads as follows;
Installatiuon work and electrical wiring must be done by a qualified person(s) in accordance with all applicable codes and standards, including fire-rated construction codes and standards
