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21M51U-843, Integrated Furnace Controls Universal Replacement

SKU kpi002-21M51U-843
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Product details

SKU: kpi002-21M51U-843
Manufacturer: White Rodgers
Manufacturer Part Number: 21M51U-843
Model Number: 21M51U-843
GTIN: 786710540707

Product description

Universal two-stage integrated furnace control for PSC blower motors includes a universal 120V nitride ignitor for 80V or 120V hot surface ignition systems.


  • 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 installation and system troubleshooting
  • 120V air cleaner output and 120V humidifier output up to 1 Amp max
  • Added dipswitches to trial for ignition and blower delays
  • Additional blower motor wire extensions
  • Trane ignitor mounting bracket is included

Additional Information

AccessoriesIncludes Ignitor
Amp Rating14.5 FLA-25.0 LRA @ 120 Vac (Circulator Relay)
Ambient Operating Temperature-40 to 175 deg. F (-40 to 79 deg. C)
Operating Humidity5% to 93% relative humidity (non-condensing)
Multiple Input Voltages24 Vac, 120 Vac, 50/60 Hz

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