Working on old moble home electric furnace w/add on a/c. H.O. called with complaint of no heat. After find the wireing messed up, he admitted to replacing the t-stat. Found the rc/rh jumpered as is typical, but then noticed two red wires tied together at a/h. Further investigation found seperate transformers in A/H and cond. unit. H.O. swears he only touched wires @ t-stat, anyway I managed to get the heat going, but fried the OD trans. I've heard of seperate trans. , but this is the first I've seen. No diagram available. What's the best way to fix this? Why not rewire w/one trans., or does the seperate one for heat have something to do w/the fan interlock or something unique to this system?
Thanks for the help.