I have an Aprilaire 700 whole house humidifier with a manual mode humidistat on the return. I noticed that the unit was draining water even when the heater/fan was off. Is this expected? I just hear it constantly draining, which I'm guessing is due to low humidity in the return? What's the point of draining when the fan is off?
Additional details: If I lower the threshold on the humidistat, I hear the solenoid engage (or disengage?) and the unit stops draining. There are no noticeable leaks. The only water I see is what comes out of the drain pipe.
Best Answer
Sometimes the moisture drains when the fans and or compressor is no longer running, we would to know more about your system, it could be a bad valve in the supply to the humidifier causing the water but more information is really needed to provide a positive answer.