The AAON ASM02201 Full Digital Refrigeration Module is an electronic control component designed for compatible AAON commercial HVAC and refrigeration systems. It monitors operating conditions and coordinates refrigeration functions by processing signals from sensors and system controls, helping regulate compressors, fans, and other components. Used in compatible rooftop units, package... https://www.partshnc.com/asm02201-aaon-full-digital-refrig-module