The Daikin-McQuay 056792404 Mark IV AC Control Board is an electronic control component designed to manage and coordinate the operation of compatible Daikin-McQuay HVAC equipment. It works by receiving signals from system sensors and controls, processing operating conditions, and regulating functions such as cooling, fan operation, and system protection. Commonly used in commercial ai... https://www.partshnc.com/056792404-daikin-mcquay-mark-iv-ac-control-board