White-Rodgers - 21M51U-843 - Universal Two Stage Hot Surface Ignition Control

Item: WWR21M51U843
MFG: 21M51U-843
Loading price
/ EA
Loading Inventory
Universal Two Stage Hot Surface Ignition Control, 3 Speed (PSC) Circulator Furnace Control Kit. Replaces WR 50M51-242 and all 50M61-xxx's Two-Stage H.S.I. Systems with 80v or 120v Ignitors


Ignition Module/Circulator Furnace Control Kit with Nitride Ignitor.

  • 120 VAC 3-speed PSC (Permanent Split Capacitor) circulator output, two-speed inducer output, 2-stage gas valve output.
  • Pushbutton fault history retrieval.
  • Furnace status LED - tri-color (green, red and amber).
  • Heat fan off delay (dipswitch selectable), fan on delay for cooling.
  • Auto second stage delay (dipswitch selectable).
  • 120 VAC humidifier output/120 VAC electronic air cleaner output.
Replaces: X13650839010, CNT03077, 83L9301, 50M61-843, KIT15943, 50M61-495, 50M61-289, 50M61-288, Y4151, 63W26, 50M61-120, 39M26, 100869-03, S1-33109168000, S1-03109168000, S1-33109117000, S1-03109117000, S1-33103009000, S1-03103009000, S1-33102954000, S1-03102954000, 872670, 67298, 542767, 50M51-242, 265903, 46M9901, 20300003, 20300001, 18M3401

California residents: see Proposition 65 Warning

Features and Specification

Height 1.4700
Ignition Type Hot Surface
Brand White-Rodgers
EAN 0786710540707
Cubic Measurement 0.0329
Cycle/Hertz 60 Hz
Dimensional Weight 2.0000
UPC 786710540707
Voltage 120 VAC
Width 4.8300
Length 8.0000
Phase Single
Package Height 9.7500
Package Length 2.2500
Package Weight 1.4000
Package Width 10.7500
Weight 1.3800