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+LA+Air+Conditioning+Contractors,+Victory+Boulevard,+Canoga+Park,+CA,+USA&mode=driving" width='100%' height='600'> hvac unitIt can be created which has a relay, bridge rectifier and some of resistors & capacitors.The bridge output is linked to the relay swap.To close the change i have to obtain a voltage of 18v at bridge output.For those who’re t