Can any one tell me if I can set up a Lennox hot air furnace for ac? The furnace's model number is G11Q4E137V7 with electronic spark ignition control model # S8610U and the blower is being controlled by a line voltage fan limit control. I'm a heating contractor that never had to convert an existing furnace, that was never set up for ac and add the necessary controls. So the owner can use his old unit to operate his AC. I believe that the only controls that I might need is a R8285 control center and R8222 switching relay. If any one can tell me if I'm right or wrong and knows the wiring of the new controls with the old furnace controls would be greatly appreciated.