Nordyne 660303R Orifice

The Nordyne 660303R Orifice is a precision-engineered OEM replacement part specifically designed for LP (Liquid Propane) gas configurations in 66 Series furnaces. As a .010 LP Pilot Orifice, it ensures the exact metered flow required to maintain a stable pilot flame, preventing common ignition failures and intermittent lockouts. In the field, technicians recognize this component by its 0.5" depth and 0.3" diameter, making it a drop-in solution for Nordyne pressure regulators and Intertherm or Miller heating units. When troubleshooting a pilot that is too large or exhibiting poor combustion, replacing the existing orifice with this genuine Nordyne furnace part restores the system to factory-spec gas flow rates. This HVAC pilot assembly component is critical for achieving optimal AFUE ratings in high-input residential and light commercial systems, particularly those rated up to 300,000 BTU. Relying on authentic Nordyne 660303R hardware ensures heating system compatibility and long-term durability under high-temperature conditions.

• Precise Gas Metering: The .010 orifice size provides the exact fuel-to-air ratio for LP systems, eliminating soot buildup and unstable pilot flames.
• OEM Compatibility: Designed exclusively for Nordyne and Miller furnace series, ensuring a perfect fit without the need for field modifications.
• Durable Construction: Manufactured from high-grade materials to withstand constant thermal cycling within the pilot assembly.
• System Efficiency: Restores proper pilot light performance, contributing to the overall reliability of the ignition sequence.

Is the 660303R compatible with Natural Gas?
No, this specific orifice is calibrated for LP (Propane) applications only. Using it with Natural Gas will result in improper burner performance and potential safety hazards.

How do I know if the pilot orifice needs replacement?
If the pilot flame is excessively large, orange, or blowing off the thermocouple, the orifice may be enlarged or fouled and should be replaced with a genuine Nordyne 660303R.

Which furnace brands use this .010 orifice?
While commonly used in Nordyne units, it is also the standard replacement part for many Intertherm and Miller mobile home furnaces requiring an LP pilot setup.

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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.