Lennox 77W04 Gas Valve
The Lennox 77W04 Gas Valve is a critical OEM component specifically engineered for multi-stage heating systems requiring high-precision fuel regulation. This 24v 2 stage gas valve (White Rodgers 36J55-254P1) is designed with a 1/2" NPT inlet and outlet, supporting both direct spark and hot surface ignition configurations. As a high-performance HVAC replacement part, it handles a maximum pressure of 1/2 PSI with a factory-set high fire of 3.5" W.C. and a low fire of 1.7" W.C. Technicians seeking a reliable Lennox furnace gas valve will find the 103181-01 model provides stable combustion across varying demands. This natural gas valve is also field-convertible for LP applications using the appropriate conversion kit. Whether you are performing a dual stage gas valve swap-out or troubleshooting erratic manifold pressure, the 77W04 offers the technical consistency necessary for residential and light commercial packaged units.
Key Benefits- Optimized Combustion: Features factory-calibrated 2-stage regulation for high and low fire efficiency.
- Broad Compatibility: Directly replaces part numbers 88J76, 88J7601, and 103181-01 in Lennox, Armstrong, and Ducane equipment.
- Technical Precision: Includes 1/8" NPT inlet and outlet pressure taps for accurate field testing and manifold adjustments.
- System Versatility: Designed for use with both HSI and DSI ignition systems in furnaces and rooftop units.
What are the manifold pressure settings for the 77W04?
The unit is factory-set to 3.5" W.C. for high fire and 1.7" W.C. for low fire. These can be adjusted between 2.0"-5.0" (High) and 1.0"-4.0" (Low) for natural gas applications.
Can the Lennox 77W04 be used with Propane (LP) gas?
Yes, while configured for natural gas, it can be converted with a compatible White Rodgers LP conversion kit. Adjustments to the regulator range (6.0"-12.0" High; 4.0"-10.0" Low) are required during conversion.
How do I verify if this 2-stage valve is compatible with my furnace?
Technicians should cross-reference the 103181-01 or 36J55-254P1 part number located on the original valve body. This valve is the standard OEM replacement for most Lennox 2-stage furnaces.
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.
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Description
The Lennox 77W04 Gas Valve is a critical OEM component specifically engineered for multi-stage heating systems requiring high-precision fuel regulation. This 24v 2 stage gas valve (White Rodgers 36J55-254P1) is designed with a 1/2" NPT inlet and outlet, supporting both direct spark and hot surface ignition configurations. As a high-performance HVAC replacement part, it handles a maximum pressure of 1/2 PSI with a factory-set high fire of 3.5" W.C. and a low fire of 1.7" W.C. Technicians seeking a reliable Lennox furnace gas valve will find the 103181-01 model provides stable combustion across varying demands. This natural gas valve is also field-convertible for LP applications using the appropriate conversion kit. Whether you are performing a dual stage gas valve swap-out or troubleshooting erratic manifold pressure, the 77W04 offers the technical consistency necessary for residential and light commercial packaged units.
Key Benefits- Optimized Combustion: Features factory-calibrated 2-stage regulation for high and low fire efficiency.
- Broad Compatibility: Directly replaces part numbers 88J76, 88J7601, and 103181-01 in Lennox, Armstrong, and Ducane equipment.
- Technical Precision: Includes 1/8" NPT inlet and outlet pressure taps for accurate field testing and manifold adjustments.
- System Versatility: Designed for use with both HSI and DSI ignition systems in furnaces and rooftop units.
What are the manifold pressure settings for the 77W04?
The unit is factory-set to 3.5" W.C. for high fire and 1.7" W.C. for low fire. These can be adjusted between 2.0"-5.0" (High) and 1.0"-4.0" (Low) for natural gas applications.
Can the Lennox 77W04 be used with Propane (LP) gas?
Yes, while configured for natural gas, it can be converted with a compatible White Rodgers LP conversion kit. Adjustments to the regulator range (6.0"-12.0" High; 4.0"-10.0" Low) are required during conversion.
How do I verify if this 2-stage valve is compatible with my furnace?
Technicians should cross-reference the 103181-01 or 36J55-254P1 part number located on the original valve body. This valve is the standard OEM replacement for most Lennox 2-stage furnaces.
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.
