Item #: WR21M51U-843
Supplier #: 21M51U-843
Universal Integrated Furnace Control Two Stage Hot Surface Ignition For 3 Speed (PSC Blower Motor Systems). Includes 21D64-2 Universal Silicon Nitride Ignitor Upgrade Kit. Replaces White-Rodgers 50M51-242 and all 50M61-xxx's Two-Stage HSI Systems with 80V or 120V Ignitors