Just installed a new nordyne heat air unit in a mobile home and my wall thermostat is a 4 wire I have ran the why to y the g to g the w to w and the are to r with a jumperon rh and rc how ever I'm not sure how to run the thermostat wires to the circuit in side the unit or what jumps to make .the fan comes on but the element will not come on . The air side is not being incorparated .