White-Rodgers 21V51U-843 Universal Hot Surface Ignition Control, 25 VAC, 530 mA

WHITE-RODGERS 21V51U-843 UNIVERSAL 2 STAGE HSI INTEGRATED VARIABLE SPEED (ECM) CIRCULATOR FURNACE CONTROL KIT

Ignition Control Boards
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White-Rodgers 21V51U-843 Universal Hot Surface Ignition Control, 25 VAC, 530 mA

3173470 MFG #: 21V51U-843 Product ID:3173470
Famous Supply
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  • Depth: 1-1/4 in
  • Height: 8 in
  • Type: Universal
  • Width: 5-1/4 in
  • Voltage Rating: 25
  • Amperage Rating: 530
  • Domestic/Import: Import
  • Probe Length: 15-1/2 in
  • Electrical Connections: 1/4 in Spade Terminal and Molex Plug
  • Lead Length: 15-1/2 in
  • Gas Type: Natural/Liquid Propane
  • Accessory Type: Hot Surface Ignition Control
The 50V51-843 is a two stage automatic gas interrupted ignition control employing a microprocessor to continually monitor, analyze, and control the proper operation of the gas burner and inducer. the 50V51-843 provides signals for proper operation of a variable fan speed circulator blower signals interpreted during continual surveillance of the two stage thermostat and flame sensing element initiate automatic ignition of the burner, sensing of the flame, and system shutoff during normal operation. the control incorporates system fault analysis for quick gas flow shutoff coupled with automatic ignition retry upon sensing a fault correction.
  • Features
  • Standards & Approvals
  • Includes
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
CSA Certified
21D64-2 Silicon Nitride Igniter Upgrade Kit