Product Description
White Rodgers 21V51U-843 Universal Two Stage Hot Surface Ignition Variable Speed (ECM) Circulator Furnace Control Replacement Kit. Replaces All WR 50V51-xxx's and 50V61-xxx's Two-Stage H.S.I. Systems with 80v or 120v Ignitors.Universal Two Stage Hot Surface Ignition Control For 3 Speed (ECM Blower Motor Systems). Includes 21D64-2 Silicon Nitride Ignitor Upgrade Kit. Replaces White-Rodgers 50V51-xxx and 50V61-xxx Two-Stage HSI Systems with 80V or 120V Ignitors