Dear Mr. Campbell
This is in reference to your model 560 Aprilaire humidifier. Water will drain from your humidifier every time the humidifier operates. This is normal operation. The water however, is designed to drain to a floor drain or a laundry tub. You indicated the water is draining outside your home. We do not typically recommend this as water can freeze and back up into the home. The drain line also may clogging causing water to back up as well. We suggest you discuss this with your HVAC installer and have them relocate the drain line to inside your home.
We have a whole house aprilaire unit model 560, lots of water is getting dumped on the ground outside (some is leaking back under the house) even when we reduce the flow of water to the unit. Suggestions??? We are not using it at this point.