As it does so the mercury switch opens and cuts power to the solenoid which retracts and hits the LH chime. Edwards Doorbell Transformer Wiring Diagram Edwards 596 pertaining to Friedland Transformer Wiring Diagram image size 596 X 596 px and to view image details please click the image. With some wiring equipment and the right technique you can wire a Friedland doorbell in a few steps.