Reznor 84853 Burner Orifice

For veteran technicians servicing industrial heating systems, the Reznor 84853 Burner Orifice is a critical precision-engineered component for maintaining stoichiometric combustion. This #47 brass burner orifice is specifically machined to meet rigid OEM tolerances for Reznor unit heaters and gas-fired equipment. Constructed from high-grade, corrosion-resistant brass, this spud-style orifice ensures a stable gas flow rate, which is essential for preventing common calls regarding weak yellow flames or insufficient heat rise. As a genuine Reznor replacement part, it provides exact gas metering that aftermarket universal alternatives often fail to replicate, protecting the heat exchanger from localized hot spots. Whether you are performing a seasonal tune-up or converting gas types, verifying the #47 drill size is paramount for aligning with the manifold pressure specifications of the specific Reznor model. This HVAC burner orifice is engineered to withstand the thermal stress of high-efficiency combustion chambers, ensuring long-term reliability in commercial and residential gas-fired heating systems.

• OEM Precision: Calibrated as a #47 orifice to ensure exact BTU input and flame stability.
• Durable Brass Construction: High-grade material resists oxidation and soot buildup in high-heat environments.
• Optimized Combustion: Designed to maintain a crisp blue flame, reducing carbon monoxide risk and emergency service calls.
• Direct Compatibility: Engineered specifically for Reznor heating systems, ensuring a perfect thread fit on the burner manifold.

What are the signs of a clogged or incorrect burner orifice?
Technicians often encounter weak or lazy yellow flames, which indicate a partial blockage (often from spider webs or scale) or an undersized orifice. Conversely, an oversized orifice will cause over-firing and potentially crack the heat exchanger. The Reznor 84853 #47 size must match the rating plate of the unit.

Can I drill out an old orifice to match the #47 specification?
No. Field-drilling an orifice often results in irregular internal surfaces that cause turbulent gas flow. For proper safety and efficient HVAC burner performance, always use a factory-stamped #47 burner orifice like the 84853.

How do I confirm if this orifice is for Natural Gas or Propane?
Orifice sizing depends on the heating value of the fuel and the manifold pressure. Always consult the Reznor technical manual for your specific model number to ensure the #47 orifice is correct for your altitude and gas type.

This item is not eligible for free shipping.

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.