Reznor 93973 Orifice

Maintaining proper ignition in commercial unit heaters requires precise fuel metering, and the Reznor 93973 Nat Gas Pilot Orifice is the OEM standard for ensuring consistent natural gas flow. As a critical component within the pilot burner assembly, this precision-drilled brass fitting regulates gas delivery to create the stable, bushy flame necessary to maintain thermocouple millivoltage. In the field, a clogged or worn orifice is often the primary culprit behind weak pilot flames that fail to stay lit or trip the high-limit switch due to delayed ignition. Designed specifically for Reznor gas-fired HVAC systems, this genuine replacement part allows technicians to restore factory-spec combustion without the risks of drilling out universal fittings. Using a genuine Reznor 93973 replacement ensures that the pilot flame behavior matches the unit's thermal requirements, preventing nuisance service calls and optimizing the reliability of the integrated gas valve and burner sequence. For contractors and building maintenance teams, keeping these HVAC pilot orifices in stock is standard practice for winter prep and emergency unit heater repairs.

• OEM Precision: Guaranteed Reznor 93973 sizing ensures the exact BTU input for natural gas pilot assemblies.
• Combustion Stability: Provides a steady flame to ensure the thermocouple or flame sensor generates the signal required for the main burner to fire.
• Durable Brass Construction: Machined to withstand high-temperature environments within gas-fired unit heaters and duct furnaces.
• Direct Compatibility: Eliminates guesswork during pilot burner troubleshooting by providing a drop-in replacement for worn factory orifices.

What are the signs that a Reznor pilot orifice needs replacement?
If you observe a "lazy," yellow, or flickering pilot flame that cannot be adjusted, or if the unit fails to stay lit despite a new thermocouple, the 93973 natural gas orifice is likely restricted by debris or carbon buildup.

Can I use this orifice for a Propane (LP) conversion?
No, this specific part is calibrated for natural gas pressures. For LP applications, a different orifice size is required to compensate for the higher energy density and pressure of liquid propane.

How often should these orifices be cleaned?
During annual maintenance, we recommend inspecting the orifice. However, if the pilot shows signs of restriction, replacement is often more reliable than manual cleaning, which can accidentally enlarge the opening and cause improper combustion.

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.