Here is the wiring diagram for the humidifier
. However, I am not using the aprilaire controller I am using the furnace and Bryant thermostat to control the humidifier.
The installation paperwork under furnished items says it includes a 24VAC transformer, however I can't for the life of me find one or locate it in the parts list on in the humidifier. I'm wondering if it isn't part of the digitial control unit I'm not using.
In my mind I should be able to just wire the HUM and 24VAC common to the brown wires coming out of the humidifier. When energized they should kick on the fan and solenoid.
However due to the possibility of the 24VAC transformer backfeeding into the furnace I don't dare go directly to the furnace 24VAC.