service

I went to the Reznor web site looking for wiring diagrams for  Mod # RPBL600-8-S-MU controlled from a Selectra Maxitrol controller.  After two attempts I received error messages.  Does anyone know where I may find this info?  Also, this was the first time that I looked at this MAU and at some point the cooling was disconnected from the Maxitrol.  The two stage cond unit was being controlled from a two stage Ranco electronic temperature controller located in the blower compartment.  I wonder what happens in the heating mode.  I assume that the Maxitrol is defective.