Maxwell's Hardware

CONTROL IGN SURF HOT HOT SURF IGN CTRL

Part Number: 21M51U843
White-Rodgers 21M51U-843 Universal Hot Surface Ignition Control, 25 VAC, 530 mA
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  • 120 VAC 3 speed PSC circulator output, two-speed inducer output, two 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)
  • -40 to 175 deg F
  • 2-stage gas valve output
  • 3 A fuse protection
  • Pressure switch inputs and monitoring
  • Flash microprocessor with non-volatile memory
  • Flame current measurement points
  • 1.5 A valve relay
  • 2.2 FLA to 3.5 LRA inducer relay
  • 14.5 FLA to 25 LRA circulator relay
  • 1 a max at 120 VAC humidity
  • 1 a max at 120 VAC electronic air cleaning
  • 4 a max at 132 VAC ignitor relay
  • 0.3 uA DC max current for flame detection
  • 0.1 uA DC min current for flame detection
  • 100 M ohm leakage resistance, 3 speed PSC blower motor systems