21M51U-843, Integrated Furnace Controls Universal ReplacementWhite Rodgers 21M51U 843 Universal two stage integrated furnace control for PSC blower motors includes a universal 120V nitride ignitor for 80V or 120V hot surface ignition systems. Features: Reduces inventory by replacing most White Rodgers 50A51, 50M51, and 50M61 and other two stage HSI controls with 80V or 120V ignitor. Includes a universal 120V nitride ignitor to allow replacement of 80V and 120V controls Diagnostic LED indicators streamline
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