21M51U-843 2 STAGE (PSC) BOARD UNIVERSAL HSI

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Universal two-stage integrated furnace control for PSC blower motors includes 21D64-2 universal 120V nitride ignitor for 80V or 120V hot surface ignition systems. Services Amana
Armstrong
Lennox
Trane
Goodman and York family brands. Now replaces 50A51
50M51 and 50M61 applications.

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