I have a Goodman gmpn080-4 furnace and am installing a Skuttle 190-1 humidifier. Where do I wire the two wires from the humidistat to the furnace? I see a 24v HUM screw on the board, but not sure where to place the other wire.
Connecting one wire to HUM and the other to ground worked for us. I believe this is the solution for this furnace, as 'C' (Common) is usually recommended, but this model does not have a connection for that.