I installed a GeneralAire 4400A

The wiring diagram shows how to have it running with a heat call. But I have it hooked up to hot water and I would like to run with a fan or also have it run the fan itself if it needs. Can always do that 2nd part later.

I don't really get how option 2 shown here would work correctly. Wouldn't that let the humidifier run without the furnace running at all. I should really just run it like Option 1 but use G instead of W right?