Description
The Lennox 33W18 is an OEM two-stage pressure switch engineered for use in Lennox two-stage gas furnaces. It monitors inducer draft pressure at two distinct set points — .20″ W.C. and 1.32″ W.C. — to verify safe combustion airflow conditions before allowing burner operation at each stage. This critical safety component helps protect the heat exchanger and ensures proper furnace sequencing across both low-fire and high-fire stages.
Key Features
- Two-stage pressure switch designed for Lennox two-stage gas furnaces
- Dual set points: .20″ W.C. (low stage) and 1.32″ W.C. (high stage)
- Monitors inducer draft pressure to confirm safe airflow before ignition
- Protects heat exchanger by preventing operation under inadequate draft conditions
- Direct OEM Lennox replacement for accurate fit and reliable performance
- Supports proper two-stage heating sequencing for comfort and efficiency
Application
The 33W18 is a direct OEM replacement pressure switch for select Lennox two-stage gas furnaces. Always verify compatibility with your specific furnace model before installation. Consult the furnace wiring diagram and service manual to confirm correct set-point requirements for your application.
Why Choose OEM Lennox Parts?
OEM components like the Lennox 33W18 are manufactured to the exact specifications of the original equipment, ensuring proper fit, reliable operation, and maintained system warranties. Using genuine Lennox replacement parts minimizes callbacks and keeps your customers’ systems running safely and efficiently.
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