The Marvair 70363 Control Unit Digital W/O Plate provides accurate system control for reliable HVAC equipment operation. This digital control unit is designed to monitor and manage key heating, cooling, and fan functions in compatible Marvair HVAC systems. It works by processing input signals and regulating system operation to help maintain the desired temperature and overall performa... https://www.partshnc.com/70363-marvair-control-unit-digital-wo-plate