Reznor 40964 Pilot Assembly

Field technicians know that a reliable ignition sequence begins with a precise pilot flame. The Reznor 40964 Pilot Assembly is a genuine OEM natural gas horizontal pilot engineered specifically for compatibility with Reznor unit heater models UA, XL, XLB, CXL, and CXLB (sizes 30-105). Designed for match-lit ignition systems, this assembly ensures the proper flame geometry required to consistently heat the thermocouple and initiate the main burner cycle without nuisance dropouts.

Built for the rigors of commercial and industrial HVAC environments, the Reznor 40964 features a durable horizontal mount configuration that maintains critical alignment. This replacement ignition part includes the pilot orifice but is typically provided as the assembly only; troubleshooting unit heaters often requires verifying that the associated thermocouple and 22-inch pilot tubing are clear of debris. When you are performing a Reznor heater repair, using this factory-spec HVAC replacement part ensures the gas burner ignition meets original equipment standards for safety and performance in standing pilot applications.

• OEM Compatibility: Exact fit for Reznor UA and XL series (30-105) eliminates field modifications.
• Optimized Flame Pattern: Engineered for natural gas to provide maximum thermal contact with the thermocouple.
• Horizontal Orientation: Stable mounting design prevents flame lifting or shifting during high-airflow starts.
• Industrial Durability: Constructed from high-grade materials to resist oxidation in high-core-temperature environments.

What causes a yellow or weak flame on this Reznor pilot?
A yellow flame usually indicates a lack of oxygen or a dirty pilot orifice. We recommend blowing out the assembly with compressed air before installation to ensure the natural gas pilot burner is free of internal debris.

Is the thermocouple included with the 40964 assembly?
Standard 40964 configurations are typically pilot assembly less thermocouple. To complete the standing pilot circuit on models like the UA or XLB, ensure your thermocouple (often 24-inch) is functioning at the correct millivolt output.

Can I use the Reznor 40964 for propane (LP) units?
No, the 40964 is specifically metered for natural gas. Propane applications require a different orifice size to maintain the correct BTU input and flame characteristics for gas heater parts.

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.