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White-Rodgers 21M51U-843 Universal Hot Surface Ignition Control, 25 VAC, 530 mA

Part #175446

MFG #21M51U-843

175446_White_Rodgers_21M51U-843.jpg

White-Rodgers 21M51U-843 Universal Hot Surface Ignition Control, 25 VAC, 530 mA

Part #175446

MFG #21M51U-843

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White-Rodgers 21M51U-843 Universal Hot Surface Ignition Control, 25 VAC, 530 mA

Part #175446

MFG #21M51U-843

Item Features
  • 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.