Nutone IM-3303 hook up install 4 wire remote to 3 wire master.

My original non working intercom master (Dallas Music and Sound) sent 4 wires (green, red, black, white) to the remotes, I picked up a Nutone IM-3303 at a yard sale that I am trying to hook up but this nutone master only has 3 wires, copper, center, silver. Not sure how to hook up the 4 wire remotes to the 3 wire master. Any one with any suggestions would be most appreciated.

Reply