The XL12 FCU + 4 Lights is a two-in-one controller for HVAC and lighting which reduces hardware costs and engineering effort (one LonWorks® node instead of two). HVAC application supports two sequences (heat, cool or changeover). Light application supports four lamps. Up to two of the four light loops can be for constant light control. Light switching can be done depending on light level and occupancy (configurable via plug-in). Unused inputs can be used for monitoring.