This is my setup. I have the 120v connection coming to a switch then going to the 120v connection of the Honeywell Humidifier HM700A1000.

This is the 120v connection of the humidifier.

This is the Honeywell HumidiPRO H6062 mounted in the return line of the duct work.

These are the connections in the humidifier.

This is my wiring diagram minus the HUM connection. There is nothing connected on the HUM connection. Additionally, I do have an outdoor sensor, but it is connected to S1 and DOES NOT return to S2