The furnace model tag has been painted over and the limit switch has blew a terminal off and I'm not able to cross reference the limit switch. Out of shear desperation I ordered a Supco L180-20 limit switch. It "Looks" like it will fit. There's apparently three coils . Two in a upper rack 9kw and one on the lower rack 4.8kw as near as I can read the lower coil the 4.8 KW is the limit switch to be replaced. Am I in the "ballpark on limit switch temps for replacement? I've no way of telling what OEM was/is for part numbers.