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White-Rodgers 21V51U-843 Universal Two Stage Furnace Control, 24 VAC, 14.5 A

Part #175448

MFG #21V51U-843

175448_1287_White_Rodgers_21V51U_843.jpg

White-Rodgers 21V51U-843 Universal Two Stage Furnace Control, 24 VAC, 14.5 A

Part #175448

MFG #21V51U-843

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White-Rodgers 21V51U-843 Universal Two Stage Furnace Control, 24 VAC, 14.5 A

Part #175448

MFG #21V51U-843

Item Features
  • 16-pin variable speed circulator output for ECM.
  • Dipswitch selectable for OEM applications 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.
  • -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.