The Daikin-McQuay 4009492 Printed Circuit Board is a replacement control board designed to manage and coordinate electrical functions within compatible HVAC systems. It processes signals from sensors, controls connected components, and helps maintain proper system operation by regulating sequences and commands. This PCB is commonly used in Daikin and McQuay commercial air conditioning... https://www.partshnc.com/4009492-daikin-mcquay-printed-circuit-board-control