Robertshaw 1751-749 Ignitor/Sensor Assembly

The Robertshaw 1751-749 Ignitor/Sensor Assembly is a high-performance spark intermittent pilot component designed for precise flame rectification in residential and commercial gas heating systems. Featuring 72-inch leads, this assembly provides the necessary reach for complex cabinet configurations where standard lead lengths fall short. Engineered for 24V AC operation, it is a critical replacement for the Robertshaw 712 series Uni-Kit and various OEM furnace ignition parts. The assembly utilizes a round tip style and a universal mounting bracket to ensure reliable flame sensor positioning and consistent pilot ignition across Natural Gas and LP applications. This hardwired HVAC replacement part includes all necessary mounting hardware to restore system sequence of operation and prevent nuisance lockouts caused by weak flame signals or faulty electrodes.

• Universal Compatibility: Designed for use with the Robertshaw 1751 series and intermittent pilot ignition systems, streamlining truck stock for multiple furnace models.
• Extended 72" Leads: Simplifies installation in larger heating units and custom burner assemblies by providing ample length for secure wire routing.
• Precision Flame Detection: The high-grade flame sensor probe ensures rapid microamp response to the ignition control module, maintaining safe combustion cycles.
• Adjustable Mounting Hardware: Includes a versatile mounting bracket and hardware to adapt to existing pilot burner orientations without specialized tools.
• Multi-Fuel Support: Optimized for consistent performance in both Liquid Propane (LP) and Natural Gas environments.

How do I verify the flame signal on this sensor?
Technicians should measure the DC microamps (µA) in series with the flame sensor wire during the run cycle. A steady signal, typically between 2.0 to 5.0 µA depending on the ignition control unit, indicates proper flame impingement on the Robertshaw 1751-749 probe.

Can the 72-inch leads be trimmed if they are too long?
While the 72-inch lead length is intended for reach, excess wire should be coiled and secured away from high-heat zones and moving parts to prevent interference with the spark intermittent pilot signal.

Why is my system locking out with a new ignitor assembly?
Ensure the universal mounting bracket provides a solid ground path to the burner assembly. Poor grounding is the most common cause of failed flame rectification in 24V AC gas valves and pilot ignition controls.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.