Description
Lennox 25B82 Two-Stage Pressure Switch Overview
The Lennox 25B82 is a factory-specified two-stage pressure switch designed as a direct OEM replacement for compatible Lennox heating systems. With dual set points of 1.00″ W.C. and 0.55″ W.C., this switch monitors negative pressure generated by the inducer motor to verify proper venting before allowing ignition to proceed — a critical safety function in modern two-stage gas furnaces.
Key Features
- Two-stage pressure switch with dual set points: 1.00″ W.C. and 0.55″ W.C.
- OEM Lennox replacement part — ensures proper fit and function
- Monitors inducer motor negative pressure for safe furnace operation
- Prevents ignition if adequate draft or venting is not confirmed
- Designed for use in compatible Lennox two-stage gas furnaces
- Direct drop-in replacement for simplified installation
How It Works
The pressure switch senses the negative (suction) pressure created by the draft inducer blower. In a two-stage furnace, the switch verifies that the correct pressure thresholds are met at both low-fire (0.55″ W.C.) and high-fire (1.00″ W.C.) stages before the control board allows the gas valve to open and the burners to ignite. If pressure falls outside the acceptable range — indicating a blocked flue, failed inducer, or venting issue — the switch opens the circuit and locks out ignition, protecting the equipment and occupants.
Application
- Compatible with select Lennox two-stage gas furnace models
- Ideal for service technicians performing OEM-quality repairs
- Verify compatibility with your specific furnace model before ordering
Why Choose OEM Lennox Parts?
Using genuine Lennox replacement components like the 25B82 ensures your repair meets the original equipment specifications, preserving system efficiency, warranty compliance, and long-term reliability. Avoid nuisance lockouts and callbacks by installing the correct part the first time.
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