I didn't notice this until recently, but our Aprilaire 760 runs regardless of the furnace blower running, whereas our 550 model does not. Is that typical for the 760?
Thank you for contacting us with regards to your model 760 Humidifier. Both the 550 and 760 should run only when the furnace is on, or at least the blower is running. When there is no air moving through your ducts, Aprilaire humidifiers should be off, as well. If your 760 runs without the furnace, we would recommend that you contact either your original installer or current Aprilaire service technician. If you don't have a current technician, please visit us online at www.aprilaire.com and enter your ZIP code into our dealer locator. You should get contact information for several nearby companies.
We appreciate the opportunity to be of assistance.