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White-Rodgers 21M51U-843 Universal Two-Stage HSI Furnace Ignition Control Kit
- Regular price
- $399.00
- Sale price
- $399.00
- Regular price
-
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Product Description P/N: 21M51U-843
Description
The White-Rodgers 21M51U-843 is a universal two-stage hot surface ignition (HSI) control kit designed for gas furnace systems with PSC blower and inducer motors. It combines an integrated furnace control board with a 120V nitride ignitor to manage ignition sequencing, burner operation, and blower control.
Technical Specifications
| Condition | New/Never Used Surplus |
| Brand | White-Rodgers |
| Category | HVAC Controls |
| Part Number | 21M51U-843 |
| Subcategory | Furnace Ignition Control Kits |
| Product Series | Universal Integrated Furnace Controls |
| Product Type | Two-Stage HSI Control Kit |
| Control Model | 50M51-843 |
| Ignition Type | Hot Surface Ignition (HSI) |
| Ignitor Model | 21D64-2 |
| Ignitor Voltage | 120 VAC |
| Control Voltage | 24 VAC, 60 Hz |
| Heating Stages | 2 |
| Blower Motor Compatibility | 3-Speed PSC |
| Inducer Motor Control | 2-Speed |
| Gas Valve Output | Two-Stage |
| Fuse Protection | 3 Amp |
| Flame Detection Sensitivity | Minimum 0.3 µA DC |
| Operating Temperature | -40°F to 175°F (-40°C to 80°C) |
| Operating Humidity | 5%–93%, Non-Condensing |
| Approved Fuel Types | Natural Gas, LP Gas and Approved Gas Mixtures |
| Dimensions | 5.25 × 8 × 1.25 Inches |
| Included Components | Control Board, Universal Ignitor, Mounting Bracket, Screws, Motor Lead Extensions |
| Weight | 1.76 lb |
Information About 21M51U-843
The 21M51U-843 belongs to White-Rodgers' universal integrated furnace control range, designed for compatibility with multiple two-stage furnace configurations. The kit includes a 50M51-843 integrated furnace control, a 21D64-2 universal nitride ignitor, a Trane ignitor mounting bracket, mounting screws, and motor lead extensions. Its control architecture supports three-speed PSC circulator motors, two-speed inducer operation, and two-stage gas valve outputs. It is designed for compatible Goodman, Amana, Lennox, Armstrong, Trane, American Standard, and York furnace applications.
Key Features:
-
Two-Stage Ignition Control: Manages heating sequences in compatible two-stage gas furnaces.
-
120V Nitride Ignitor: Includes a universal hot surface ignitor for supported ignition systems.
-
Three-Speed PSC Circulator: Supports low, high, and cooling blower speed operation.
-
Two-Speed Inducer Control: Provides control outputs for compatible inducer motors.
-
Two-Stage Gas Valve Output: Supports staged burner operation through the gas valve circuit.
-
Diagnostic LED: Features a tri-color status indicator for operating and fault information.
-
Integrated Safety Protection: Includes 3A fuse protection and flame sensing circuitry.
-
Universal Furnace Compatibility: Supports selected Goodman, Amana, Lennox, Armstrong, Trane, and York applications.
The 21M51U-843 delivers the reliability and precision required for two-stage furnace ignition, gas burner sequencing, and PSC blower control.
Description
The White-Rodgers 21M51U-843 is a universal two-stage hot surface ignition (HSI) control kit designed for gas furnace systems with PSC blower and inducer motors. It combines an integrated furnace control board with a 120V nitride ignitor to manage ignition sequencing, burner operation, and blower control.
Technical Specifications
| Condition | New/Never Used Surplus |
| Brand | White-Rodgers |
| Category | HVAC Controls |
| Part Number | 21M51U-843 |
| Subcategory | Furnace Ignition Control Kits |
| Product Series | Universal Integrated Furnace Controls |
| Product Type | Two-Stage HSI Control Kit |
| Control Model | 50M51-843 |
| Ignition Type | Hot Surface Ignition (HSI) |
| Ignitor Model | 21D64-2 |
| Ignitor Voltage | 120 VAC |
| Control Voltage | 24 VAC, 60 Hz |
| Heating Stages | 2 |
| Blower Motor Compatibility | 3-Speed PSC |
| Inducer Motor Control | 2-Speed |
| Gas Valve Output | Two-Stage |
| Fuse Protection | 3 Amp |
| Flame Detection Sensitivity | Minimum 0.3 µA DC |
| Operating Temperature | -40°F to 175°F (-40°C to 80°C) |
| Operating Humidity | 5%–93%, Non-Condensing |
| Approved Fuel Types | Natural Gas, LP Gas and Approved Gas Mixtures |
| Dimensions | 5.25 × 8 × 1.25 Inches |
| Included Components | Control Board, Universal Ignitor, Mounting Bracket, Screws, Motor Lead Extensions |
| Weight | 1.76 lb |
Information About 21M51U-843
The 21M51U-843 belongs to White-Rodgers' universal integrated furnace control range, designed for compatibility with multiple two-stage furnace configurations. The kit includes a 50M51-843 integrated furnace control, a 21D64-2 universal nitride ignitor, a Trane ignitor mounting bracket, mounting screws, and motor lead extensions. Its control architecture supports three-speed PSC circulator motors, two-speed inducer operation, and two-stage gas valve outputs. It is designed for compatible Goodman, Amana, Lennox, Armstrong, Trane, American Standard, and York furnace applications.
Key Features:
-
Two-Stage Ignition Control: Manages heating sequences in compatible two-stage gas furnaces.
-
120V Nitride Ignitor: Includes a universal hot surface ignitor for supported ignition systems.
-
Three-Speed PSC Circulator: Supports low, high, and cooling blower speed operation.
-
Two-Speed Inducer Control: Provides control outputs for compatible inducer motors.
-
Two-Stage Gas Valve Output: Supports staged burner operation through the gas valve circuit.
-
Diagnostic LED: Features a tri-color status indicator for operating and fault information.
-
Integrated Safety Protection: Includes 3A fuse protection and flame sensing circuitry.
-
Universal Furnace Compatibility: Supports selected Goodman, Amana, Lennox, Armstrong, Trane, and York applications.
The 21M51U-843 delivers the reliability and precision required for two-stage furnace ignition, gas burner sequencing, and PSC blower control.
