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50M56U-843
Universal Single Stage HSI Integrated Furnace Control Kit. Replaces HK42FZ004, HK42FZ007, HK42FZ008, HK42FZ009, HK42FZ011 and HK42FZ016
Universal Two Stage Hot Surface Ignition Control For 3 Speed (PSC Blower Motor Systems). Includes 21D64-2 Silicon Nitride Ignitor Upgrade Kit. Replaces White-Rodgers 50M51-242 and all 50M61-xxx's Two-Stage HSI Systems with 80V or 120V Ignitors