Wiring:The iWave-R includes a patented universal voltage 24VAC to 240VAC input ability. The black wire (marked ‘AC’ on label) is for 24VAC to 240VAC voltage input. The white wire (marked ‘N’ about the label) could be the neutral leg for 24VAC or 120VAC; or one other very hot leg for 208/240VAC.Most internal controls are prevalent sense –