21V51U-843 2 STAGE (ECM) BOARD UNIVERSAL HSI

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Universal two-stage integrated furnace control for 3-Speed (ECM) blower motors includes 21D64-2 universal 120V nitride ignitor for 80V or 120V hot surface ignition systems. Replaces White-Rodgers 50V51-xxx and 50V61-xxx two-stage HSI systems with 80V or 120V ignitors
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