I recently picked up a furnace to work on and get some practice with and there were no panels on it. I am wondering if someone knows how to find a schematic for a Heil furnace, Model number NUGG050AD01 Serial number H626 78679. Any help would be great. I have went to Heildlr.com site and there are a bunch of cats on there. Also went to Heil-Quaker Corp. site and couldn't find anything there.