I just purchased a used Kenmore dryer built in 2003. It has markings for 120 and 240 volts. Is this unit dual voltage, and will my existing 220 volt plug wire in with no problems as long as I match the red and black wires? I believe the white wire goes to the center post and the ground will "piggy back" to the existing ground to frame.

Post model #. See and we'll look to if any info is at www3.sears.com.