York S1-9951-1771 Orifice

Ensure precise combustion performance with the York S1-9951-1771 Natural Gas Burner Orifice, a critical component for maintaining the correct manifold pressure and thermal output in compatible York HVAC systems. This #16 drill size orifice is engineered for a 0.177-inch inside diameter, specifically calibrated for natural gas burner applications. Designed to handle throughput for systems typically ranging between 30,000 and 60,000 BTU/h, this OEM York replacement part provides the exact metering required to prevent incomplete combustion or over-firing. As a technicians choice furnace part, the S1-9951-1771 features high-grade brass construction to resist the corrosive effects of localized heat and combustion byproducts. This natural gas orifice is frequently utilized in York model DGAT090BDD and similar gas-fired furnaces, ensuring the proper air-to-fuel ratio for a clean, blue flame. Replacing a clogged or scaled orifice with this authentic burner nipple restores system efficiency and prevents common ignition lockout codes caused by poor gas flow.

• Precision Metering: The #16 orifice size ensures metered fuel flow matches the manufacturer's original specification for stoichiometric combustion.
• Direct OEM Compatibility: Engineered as a drop-in replacement for York S1-9951-1771, maintaining the integrity of the original gas manifold assembly.
• Optimized Efficiency: Critical for restoring proper BTU input and preventing the common "yellow flame" symptom associated with improper gas pressure.
• Durable Construction: Heavy-duty brass machining prevents port deformation and debris buildup over long-term operation.

What are the signs that a York burner orifice needs replacement?
Technicians should look for a weak, yellow flame or a flickering burner, which often indicates a partially blocked orifice. If you encounter a 7-flash error code (ignition lockout) despite a functioning igniter, a clogged S1-9951-1771 is a primary suspect.

Can I use this orifice for an LP conversion?
No. This component is specifically sized for natural gas. High-pressure propane requires a smaller drill size to maintain the correct BTU rating; using this natural gas orifice for LP will lead to dangerous over-firing.

Should I clean the existing orifice or replace it?
While surface debris can be removed with a wooden toothpick, internal scaling or burrs require a total replacement. Reaming out a #16 orifice with metal tools can accidentally enlarge the opening, throwing off the manifold pressure and compromising safety.

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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.