White-Rodgers 21V51U-843 Universal Two-Stage HSI Circulator Furnace Control Kit With Nitride Ignitor

White-Rodgers Universal Two-Stage HSI Circ. Furnace Control Kit. Includes Universal Nitride Ignitor Kit – 21D64-2. Variable Speed (ECM). Replaces All White-Rodgers 50V51-XXX's & 50V61-XXX's Two-Stage HSI Systems with 80V or 120V Ignitors. Easy-To-Install Kit includes everything needed for a quick and accurate replacement: • Ignition Control Module • Quick -Select/Quick-Connect Wiring Harnesses. • Universal Nitride Ignitor Kit – 21D64-2 • Installation Instructions and OEM Cross-Reference. Features: •16-pin variable speed circulator output for ECM (Electronically Commutated Motor), dipswitch selectable for OEM applications two-speed inducer output, 2-stage gas valve output •Pushbutton fault history retrieval. •Furnace status LED – tri-color (green, red and…