The Trane KIT9660 Radiant Flame Sense Conversion Kit is a specialized component designed to upgrade flame sensing in gas-fired HVAC equipment such as furnaces and heating units. It works by converting the existing flame detection method to a radiant sensing system, which monitors burner flame presence more accurately to ensure safe ignition and operation. This kit enhances system reliability and safety by reducing false shutdowns and improving flame detection response. Its application supports efficient performance, simplified maintenance, and dependable operation in residential and commercial heating systems.