Description
The Lennox 73W33 is an OEM two-stage pressure switch engineered for precise draft and combustion air proving in Lennox gas furnaces. With open and close set points of .68″ W.C. and .35″ W.C. respectively, this switch monitors negative pressure produced by the inducer motor and prevents burner ignition unless safe operating conditions are confirmed — protecting both the equipment and the occupants it serves.
Key Features
- OEM Lennox replacement pressure switch — direct-fit, no modifications required
- Two-stage design with set points of .68″ W.C. (open) and .35″ W.C. (close)
- Monitors inducer draft pressure to verify safe combustion airflow before ignition
- Helps prevent unsafe furnace operation due to blocked flue, failed inducer, or restricted venting
- Durable construction built to Lennox OEM specifications for long service life
- Direct OEM part — ensures compatibility and maintains equipment warranty integrity
Application
The 73W33 pressure switch is a genuine Lennox OEM component designed as a direct replacement for compatible Lennox two-stage gas furnaces. It is a critical safety control that verifies proper inducer operation before allowing the gas valve to open, making it an essential part of any furnace safety circuit. Always verify compatibility with your specific Lennox furnace model before installation.
Why Choose OEM Lennox Parts?
Using genuine Lennox replacement parts like the 73W33 ensures your system performs to its original design specifications. OEM components are manufactured to exact tolerances, reducing callbacks, comebacks, and warranty concerns — giving technicians and homeowners confidence in every repair.
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