[HoosierDaddy]

Thanks to all for your response. Typically I approach these problems the hard way...Such as trying to source parts to build my own control box!!! As I ruminated on this I got the bright idea to call my local central vacuum dealer. He said that early systems did run the 120V to the wall inlets. As solid state voltage reducers became common they incorporated that technology. It seems that many units have the board built in. He had a board that could be modified to stand alone in a separate box. So this one board steps voltage down to 24V and relays the 120V!. I mounted it right next to the vac unit in the bay. It works great!!!