

The Universal Two-stage HSI Integrated Furnace Control Kit 21M51U-843 is a versatile solution designed to enhance your furnace's performance. This kit is compatible with the L45-928 model and replaces White-Rodgers 50M51-242 and 50M61-XXX's two-stage HSI systems. It features a 3-speed circulator furnace control and includes an ignition control module, a universal 120V nitride ignitor kit (21D64-2), and installation instructions. This kit can be easily installed in under 30 minutes with common tools.