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+LA+Air+Conditioning+Contractors,+Victory+Boulevard,+Canoga+Park,+CA,+USA&mode=driving" width='100%' height='600'> furnace repairIt's built using a relay, bridge rectifier and many of resistors & capacitors.The bridge output is connected to the relay change.To close the switch i have to get a voltage of 18v at bridge output.In case you’re thinkin