I am replacing an old HVAC control unit with a new one ... but wire
markings are different. The instructions with the new unit are
unclear. Old unit is WeatherTron New is LUX.

Old - R, T, O, G, Y, X2, B, U, W. New - G,Y,W,RH,B,O,RC. Which wire
goes to which wire?

Thanks for help.

Bob