Hi,
I just installed an Aprilaire whole house humidifier in my ductwork. All
that's left is the wiring. I have a Comfortmaker Enviroplus90 gas furnace.
It has a Honeywell St9120 fan timer control board. It has a humidifier
connection plus a neutral connector. I wired from this to the aprilaire
control. But before I turn everything on, does anyone know if these
connections are 24vdc or 120vac? I can't find any documentation on that. I
assume DC but maybe I have to wire the transformer in line?
Thanks,
Jeff