I have an older Lennox furnace that had some wires melted in a flash fire. Does anyone know where I might get the wiring schematics to rewire the unit? When I went to move the wires they broke apart and know I want to ensure that they are connected properly again. The model is G8R-120-1, serial 6377135372.

Also, what is the way to ensure that this sort of flash fire will not reoccur.
Thanks.

Sounds like the heat exchanger is plugged. I would either clean it or better yet with that old dog I wold replace it..

Before you replace the wires you need to find the root of the problem. Wires just do not burn up for no cause.