Resideo 390686-4 Orifice

The Resideo 390686-4 is a professional-grade pilot burner orifice engineered for high-precision gas flow regulation in commercial and residential heating systems. Precision-drilled to a 0.018-inch diameter, this component is specifically calibrated for natural gas pilot burner applications. As a veteran-preferred replacement part, the 390686-4 orifice is physically stamped with the BCR18 identifier, ensuring immediate field verification for service technicians. This unit is the direct technical equivalent to the 390686-4/U and provides a critical link in the pilot assembly to maintain flame stability and consistent ignition performance.

Designed for multi-series compatibility, this 0.018 natural gas orifice integrates seamlessly with a broad range of Resideo and Honeywell pilot burners, including the Q308, Q314, Q327, Q345, Q362, Q373, Q379, and Q380 families. It is also the specified standard for SmartValve pilot burners such as the Q3450, Q3451, and Q3452 series. By maintaining exact tolerances according to OEM specifications, this orifice helps prevent pilot outage issues and carboning, ensuring the efficient operation of the appliance burner controls.

Key Benefits

• OEM Compatibility: Fully compatible with Q3450 SmartValve and numerous Q-series pilot burners for streamlined inventory management.
• Technical Identification: Clearly stamped with BCR18 for fast identification during emergency service calls.
• Precision Flow Control: 0.018" port size is optimized for natural gas to ensure a stable pilot flame and reliable burner ignition.
• Direct Replacement: Features a 1/4-inch compression fit compatibility, serving as an exact match for the 390686-4/U universal part number.

Common Questions

Is the 390686-4 compatible with Liquid Propane (LP) systems?
No. This specific BCR18 orifice is engineered and calibrated strictly for natural gas applications. Using this part with LP gas will result in improper combustion and unsafe pilot flame conditions.

Can this be used to replace a BCR20 or BCR22 orifice?
While the physical dimensions may appear similar, orifices are sized for specific BTU requirements of the pilot assembly. You must verify the appliance manufacturer's data plate or service manual before substituting different orifice diameters.

Does this part include the compression nut?
The 390686-4 is the orifice insert itself. While it is designed to fit a standard 1/4" compression assembly, technicians should inspect the existing nut and ferrule for wear and replace if a gas-tight seal cannot be maintained.

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.

390686-4 is the cross for 62-3326