Lennox 73W33 Pressure Switch
The Lennox 73W33 is a high-precision dual-stage pressure switch engineered for specific Lennox furnace models and air handlers. This OEM replacement pressure switch serves as a critical safety component, monitoring the pressure differential within the combustion blower. With setpoints calibrated at .68/.35 WC, it ensures proper venting and blower performance before allowing the ignition sequence to proceed. As a two-stage pressure switch, it manages different airflow requirements for low-fire and high-fire operations, maintaining system efficiency and protecting components from operational failure due to blocked flues or inducer motor issues.
Technical specifications confirm this component is designed for HVAC repair applications where maintaining the specific differential pressure setpoint is vital for OEM compliance and system safety. Replacing a failed switch with the Lennox 73W33 HVAC part restores the furnace’s ability to correctly sense pressure drops, preventing nuisance trips and ensuring reliable heat cycles in residential and light commercial equipment.
- Precision Calibration: Factory-set at .68" and .35" WC for accurate two-stage furnace operation.
- OEM Reliability: Genuine Lennox replacement ensures seamless physical fit and electrical compatibility.
- Enhanced Safety: Prevents combustion under unsafe venting conditions by monitoring inducer draft pressure.
- Durable Construction: Built to withstand the high-temperature environment of a furnace cabinet.
Common Installation Questions
What are the symptoms of a failing Lennox 73W33?
Common indicators include the furnace failing to ignite, the inducer motor running continuously without a flame, or diagnostic codes indicating a pressure switch stuck open or closed.
Is this switch compatible with other furnace brands?
This is an OEM part specifically calibrated for Lennox equipment. Using a switch with different pressure setpoints can lead to dangerous operating conditions or frequent system lockouts.
Does this part include the tubing?
This listed part is the switch assembly itself. It is recommended to inspect all pneumatic tubing for cracks or moisture blockages during the installation of the new switch.
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.
Lennox 73W33 Pressure Switch
The Lennox 73W33 is a high-precision dual-stage pressure switch engineered for specific Lennox furnace models and air handlers. This OEM replacement pressure switch serves as a critical safety component, monitoring the pressure differential within the combustion blower. With setpoints calibrated at .68/.35 WC, it ensures proper venting and blower performance before allowing the ignition sequence to proceed. As a two-stage pressure switch, it manages different airflow requirements for low-fire and high-fire operations, maintaining system efficiency and protecting components from operational failure due to blocked flues or inducer motor issues.
Technical specifications confirm this component is designed for HVAC repair applications where maintaining the specific differential pressure setpoint is vital for OEM compliance and system safety. Replacing a failed switch with the Lennox 73W33 HVAC part restores the furnace’s ability to correctly sense pressure drops, preventing nuisance trips and ensuring reliable heat cycles in residential and light commercial equipment.
- Precision Calibration: Factory-set at .68" and .35" WC for accurate two-stage furnace operation.
- OEM Reliability: Genuine Lennox replacement ensures seamless physical fit and electrical compatibility.
- Enhanced Safety: Prevents combustion under unsafe venting conditions by monitoring inducer draft pressure.
- Durable Construction: Built to withstand the high-temperature environment of a furnace cabinet.
Common Installation Questions
What are the symptoms of a failing Lennox 73W33?
Common indicators include the furnace failing to ignite, the inducer motor running continuously without a flame, or diagnostic codes indicating a pressure switch stuck open or closed.
Is this switch compatible with other furnace brands?
This is an OEM part specifically calibrated for Lennox equipment. Using a switch with different pressure setpoints can lead to dangerous operating conditions or frequent system lockouts.
Does this part include the tubing?
This listed part is the switch assembly itself. It is recommended to inspect all pneumatic tubing for cracks or moisture blockages during the installation of the new switch.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lennox 73W33 is a high-precision dual-stage pressure switch engineered for specific Lennox furnace models and air handlers. This OEM replacement pressure switch serves as a critical safety component, monitoring the pressure differential within the combustion blower. With setpoints calibrated at .68/.35 WC, it ensures proper venting and blower performance before allowing the ignition sequence to proceed. As a two-stage pressure switch, it manages different airflow requirements for low-fire and high-fire operations, maintaining system efficiency and protecting components from operational failure due to blocked flues or inducer motor issues.
Technical specifications confirm this component is designed for HVAC repair applications where maintaining the specific differential pressure setpoint is vital for OEM compliance and system safety. Replacing a failed switch with the Lennox 73W33 HVAC part restores the furnace’s ability to correctly sense pressure drops, preventing nuisance trips and ensuring reliable heat cycles in residential and light commercial equipment.
- Precision Calibration: Factory-set at .68" and .35" WC for accurate two-stage furnace operation.
- OEM Reliability: Genuine Lennox replacement ensures seamless physical fit and electrical compatibility.
- Enhanced Safety: Prevents combustion under unsafe venting conditions by monitoring inducer draft pressure.
- Durable Construction: Built to withstand the high-temperature environment of a furnace cabinet.
Common Installation Questions
What are the symptoms of a failing Lennox 73W33?
Common indicators include the furnace failing to ignite, the inducer motor running continuously without a flame, or diagnostic codes indicating a pressure switch stuck open or closed.
Is this switch compatible with other furnace brands?
This is an OEM part specifically calibrated for Lennox equipment. Using a switch with different pressure setpoints can lead to dangerous operating conditions or frequent system lockouts.
Does this part include the tubing?
This listed part is the switch assembly itself. It is recommended to inspect all pneumatic tubing for cracks or moisture blockages during the installation of the new switch.
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.
