I have installed an Aprilaire 500A humidifier. Everything works but I noticed the bypass duct gets hot even on the side where it connects into the return duct. Which I think is caused by back flow. Is this normal? Did I install it incorrectly?
Also due to limitation I installed my controller down stream of the bypass. (2'-3') When I close the damper on the humidifier the humidity level drops quickly and when I reopen it it goes back up.