Nordyne 661021R Orifice
The Nordyne 661021R Orifice is a precision-engineered Natural Gas Main Burner Orifice designed to maintain exact fuel-to-air ratios in residential heating systems. Featuring a #21 drill size (nominal .021 diameter), this OEM component is a direct replacement for the Nortek 661021, ensuring calibrated gas flow for the MG1E 077 gas furnace and compatible mobile home heating units. For a technician in the field, using a correctly sized burner orifice is non-negotiable; an oversized orifice leads to overfiring and potential heat exchanger damage, while an undersized unit causes localized starving of the burner assembly, leading to poor flame rectification and nuisance lockouts.
This Nordyne furnace part is constructed from high-grade brass to withstand the thermal stress of the burner manifold environment and prevent thread seizing during future maintenance. Whether you are performing a seasonal tune-up or a gas valve replacement, verifying the natural gas manifold pressure against this #21 orifice specification is critical for achieving the rated BTU input. This component facilitates clean combustion and optimal heat transfer, reducing carbon monoxide risks associated with improper secondary air inspiration.
Key Benefits
- Exact Calibration: The #21 drill size is precision-machined to deliver the specific flow rate required for Nordyne heating systems.
- OEM Compatibility: Designed specifically for the MG1E 077 series, providing a seamless fit on the manifold assembly without the need for field modifications.
- Natural Gas Optimization: Specifically ported for natural gas applications, ensuring the correct velocity for proper venturi mixing.
- Durable Construction: Heavy-duty brass resists corrosion and remains reliable under high-temperature cycles common in furnace plenums.
Common Questions
What furnace models use the 661021R orifice?
The 661021R is primarily utilized in Nortek and Nordyne MG1E 077 gas furnace models, though it is used across various high-efficiency residential platforms requiring a .021 diameter port.
Can this orifice be used for propane (LP) conversions?
No, this is a natural gas burner orifice. LP conversions require a significantly smaller drill size due to the higher energy density and manifold pressure of liquid propane. Using this for LP will result in a dangerous overfire condition.
How do I verify if I need a #21 orifice for my manifold?
Reference the appliance rating plate for the specified BTU per burner. A #21 orifice is typically selected based on the local altitude and the input rating of the specific burner tube in your HVAC equipment.
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.
Original: $10.43
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Description
The Nordyne 661021R Orifice is a precision-engineered Natural Gas Main Burner Orifice designed to maintain exact fuel-to-air ratios in residential heating systems. Featuring a #21 drill size (nominal .021 diameter), this OEM component is a direct replacement for the Nortek 661021, ensuring calibrated gas flow for the MG1E 077 gas furnace and compatible mobile home heating units. For a technician in the field, using a correctly sized burner orifice is non-negotiable; an oversized orifice leads to overfiring and potential heat exchanger damage, while an undersized unit causes localized starving of the burner assembly, leading to poor flame rectification and nuisance lockouts.
This Nordyne furnace part is constructed from high-grade brass to withstand the thermal stress of the burner manifold environment and prevent thread seizing during future maintenance. Whether you are performing a seasonal tune-up or a gas valve replacement, verifying the natural gas manifold pressure against this #21 orifice specification is critical for achieving the rated BTU input. This component facilitates clean combustion and optimal heat transfer, reducing carbon monoxide risks associated with improper secondary air inspiration.
Key Benefits
- Exact Calibration: The #21 drill size is precision-machined to deliver the specific flow rate required for Nordyne heating systems.
- OEM Compatibility: Designed specifically for the MG1E 077 series, providing a seamless fit on the manifold assembly without the need for field modifications.
- Natural Gas Optimization: Specifically ported for natural gas applications, ensuring the correct velocity for proper venturi mixing.
- Durable Construction: Heavy-duty brass resists corrosion and remains reliable under high-temperature cycles common in furnace plenums.
Common Questions
What furnace models use the 661021R orifice?
The 661021R is primarily utilized in Nortek and Nordyne MG1E 077 gas furnace models, though it is used across various high-efficiency residential platforms requiring a .021 diameter port.
Can this orifice be used for propane (LP) conversions?
No, this is a natural gas burner orifice. LP conversions require a significantly smaller drill size due to the higher energy density and manifold pressure of liquid propane. Using this for LP will result in a dangerous overfire condition.
How do I verify if I need a #21 orifice for my manifold?
Reference the appliance rating plate for the specified BTU per burner. A #21 orifice is typically selected based on the local altitude and the input rating of the specific burner tube in your HVAC equipment.
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.
