Reznor 42089 Pilot Orifice

The Reznor 42089 Pilot Orifice is a high-precision HVAC replacement part specifically engineered for Liquid Propane (LP) gas-fired heating systems. Designed for use in commercial and industrial Reznor unit heaters, this LP Pilot Orifice regulates the critical delivery of fuel to the pilot burner assembly. Its calibrated opening ensures a stable pilot flame, which is essential for consistent thermocouple heating and reliable main burner ignition. Using a genuine Reznor OEM orifice prevents common combustion issues such as lazy flames, soot accumulation, or pilot outages caused by improper gas-to-air ratios. This component is cross-referenced with the Y90AA-4211 specification, meeting exact factory standards for flow rate and pressure drop. For technicians performing routine maintenance or gas conversions, replacing a fouled or obstructed orifice with this heater ignition component is vital for maintaining system uptime and ensuring safe equipment operation in demanding environments.

• Precise LP Gas Regulation: Specifically machined for Liquid Propane flow requirements to ensure optimal ignition performance.
• OEM Compatibility: Guaranteed fit for Reznor HVAC equipment, eliminating the risks associated with generic or incorrectly sized aftermarket orifices.
• Stabilized Pilot Operation: Maintains a consistent flame pattern to prevent nuisance shutdowns and thermocouple signal loss.
• Durable Construction: Built to withstand the high-temperature environment of commercial burner vestibules.
• Safety Compliance: Designed to meet original engineering specifications for safe gas combustion and reduced carbon monoxide risk.

How do I determine if my Reznor pilot orifice is clogged?
Technicians should look for a weak, yellow, or wavering pilot flame. If the pilot light fails to stay lit after the safety button is released, or if there is visible debris in the pilot burner assembly, the orifice may be obstructed and require replacement to restore the correct gas flow.

Can I use the 42089 orifice for Natural Gas systems?
No. The Reznor 42089 is specifically sized for the higher BTU content and pressure requirements of Liquid Propane. Using an LP Pilot Orifice with natural gas will result in an undersized flame and system failure.

What is the difference between the 42089 and the Y90AA-4211?
The 42089 is the Reznor-specific part number, while Y90AA-4211 is the manufacturer sub-component identification. They refer to the same technical specification and are interchangeable for these applications.

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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.