The Daikin-McQuay 1778003 Printed Circuit Board is an electronic control component designed to manage and coordinate essential functions in compatible HVAC equipment. It processes signals from sensors and control devices, directing connected components to support proper system operation. This PCB is used in compatible Daikin-McQuay commercial HVAC systems, including air-handling equip... https://www.partshnc.com/daikin-mcquay-1778003-printed-circuit-board-a7p