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WHITE RODGERS 21V51U843 Two-Stage Furnace Control Kit

The 21V51U-843 from White Rodgers is a universal two-stage electronic heating system control kit for furnace applications, simplifying installation and optimizing system performance. It includes the 50V51-843 gas ignition control, microprocessor monitoring, and supports multiple components like ignitors, humidifiers, and air cleaners. The control features fault analysis, automatic retry, and operates within -40°F to 175°F (-40°C to 80°C). Its dimensions are 5.25 inches wide, 8 inches high, and 1.25 inches deep, with fuse protection, status LEDs, and compatibility with various gases for reliable operation.

Authorized Distributors
Part No:21V51U-843
Stock:5
Inv Date:06-09-2026
Price: Unit price: $323.43
Buy/RFQ:
Part No:21V51U-843
Stock:0
Inv Date:06-08-2026
Price: Unit price: $306.85
Buy/RFQ:

WHITE RODGERS 21V51U843 Two-Stage Furnace Control Kit Specifications:

  • Input Voltage: 24 VAC, 60 Hz
  • Operating Temperature Range: -40°F to 175°F (-40°C to 80°C)
  • Dimensions: 5.25 inches W x 8 inches H x 1.25 inches D
  • Fuse Protection: 3 Amp
  • Relays: Gas valve 1.5 amps, inducer 2.2-3.5 amps, humidifier 1.0 amp, air cleaner 1.0 amp, ignitor 4.0 amps
  • Flame Detection: Min 0.3 na DC, Max 0.1 na DC, Leakage Resistance: 100 M ohms
  • Gases Approved: Natural, Manufactured, Mixed, LP
  • Timing: Pre-purge 15 sec, Flame Failure Response 2 sec
  • Humidity Range: 5% to 93% (non-condensing)

Buy the Buy White Rodgers 21V51U-843 Part Number 21V51U-843 Online

Enhance your heating system with the White Rodgers Two-Stage Furnace Control Kit. Designed for easy installation, it features advanced fault detection, integrated ignition control, and supports various components including humidifiers and electronic air cleaners. The kit ensures optimal system performance with quick diagnostics and fault analysis. Operating effectively between -40°F and 175°F, it offers reliable control for natural and LP gases. Its compact dimensions and fuse protection make it the ideal choice for maintaining efficient, safe, and resilient furnace operation, ensuring peace of mind and comfort.

Buy White Rodgers 21V51U-843 now and experience unmatched reliability and performance in furnace control systems.

Frequently Asked Questions

Where can I buy WHITE RODGERS 21V51U843?

You can click on the BUY or RFQ button to purchase 21V51U843 from an authorized WHITE RODGERS distributor.

How do I troubleshoot issues or seek technical support for part 21V51U843?

You can download the 21V51U843 datasheet or visit the WHITE RODGERS website for support.

Who is the manufacturer of 21V51U843?

WHITE RODGERS

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