Originally Posted by hvactech126
those terminals HUM and Neutral bar are 120vac You need a transformer. With the use of a transformer you would not need a sail switch, but would still need a humidistat.
So I need a transformer to connect between my 24vac circuit to the 120vac taps on the logic board? (I have a 24v humidistat and 24vac transformer that came with the unit).
So the circuit would look like this?
Plugin-24VAC pwr source 24v- Humidistat -24v- Humidifier -24v- XFOMER -120V- logic board.
EDIT** Ok so the humidifier system will get its power from the logic board terminals? So that means I take out the 24V power supply and just have the transformer step down the voltage from the logic board, correct???