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

WHITE-RODGERS 21M51U-843 UNIVERSAL TWO STAGE HSI INTERGRATED 3 SPEED PSC CIRCULATOR FURNACE CONTROL KIT

Ignition Control Boards
}

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

3173467 MFG #: 21M51U-843 Product ID:3173467
Famous Supply
White_Rodgers_21M51U-843_HR.png
  • 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 50M51-843 is a universal replacement control for two stage automatic gas ignition controls employing a microprocessor to continually monitor, analyze, and control the proper operation of the gas burner and inducer. the 50M51-843 controls a multiple tapped induction circulation 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. the 50M51-843 quickly and easily replaces white Rodgers 50M51-XXX controls.
  • Features
  • Standards & Approvals
  • Includes
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
CSA Certified
21D64-2 Silicon Nitride Igniter Upgrade Kit