Lennox 104549-15 is a genuine OEM 2-stage pressure switch designed to monitor and verify proper draft conditions in compatible Lennox gas furnaces. This switch plays a critical safety role by ensuring the inducer motor is operating correctly before ignition and during staged heating operation. It features two distinct pressure set points to support accurate low-fire and high-fire furnace operation.

The high-stage pressure switch is set to actuate at 0.80 inches water column, while the low-stage pressure switch actuates at 0.50 inches water column. These calibrated set points help maintain proper airflow and combustion control, protecting the furnace from unsafe operating conditions. The switch is engineered for reliable performance, consistent response, and long service life in residential and light commercial HVAC systems.

This Lennox pressure switch is commonly used as a direct replacement for failed or out-of-tolerance switches during furnace troubleshooting, maintenance, or repair. As an OEM component, it ensures proper fit, correct electrical and pressure ratings, and full compatibility with approved Lennox equipment.

 

Key features:

• Genuine Lennox OEM replacement part
• 2-stage pressure switch for staged gas furnaces
• High set point: 0.80" W.C.
• Low set point: 0.50" W.C.
• Ensures safe inducer and combustion operation
• Designed for accurate, repeatable pressure sensing
• Direct-fit replacement for compatible Lennox models