Lennox 14A44 – Lennox 104549-02, 2-Stage Pressure Switch, High 0.60" W.C.; Low 0.35" W.C.

 

The Lennox 14A44 (Lennox 104549-02) 2-stage pressure switch is an essential OEM safety component designed to monitor and verify proper airflow and venting conditions in compatible Lennox gas furnaces. Engineered for precise multi-stage performance, this pressure switch includes two calibrated set points: a high-stage activation at 0.60 inch W.C. and a low-stage activation at 0.35 inch W.C. These measurements ensure correct inducer operation, burner efficiency, and safe furnace performance across both heating stages.

This pressure switch is factory-tested to meet Lennox performance standards and is commonly required when diagnosing issues such as furnace short cycling, ignition failure, inducer malfunctions, or when replacing worn or weakened switches. The 104549-02 model is designed for quick installation with existing tubing and wiring connections on compatible Lennox units.

 

Key Features

 

• Genuine Lennox OEM 2-stage pressure switch for accurate airflow verification
• High-stage set point calibrated at 0.60" W.C.
• Low-stage set point calibrated at 0.35" W.C.
• Ensures safe furnace ignition and reliable multi-stage heating performance
• Helps prevent ignition lockouts, short cycling, and combustion issues
• Durable construction for long-term stability and repeatable pressure readings
• Direct replacement for Lennox 104549-02 on compatible furnace models

 

Technical Specifications

 

• Part Number: 14A44
• Catalog / Alternate Number: 104549-02
• Type: 2-stage furnace pressure switch
• High Stage Set Point: 0.60 inch W.C.
• Low Stage Set Point: 0.35 inch W.C.
• Application: Airflow and vent pressure verification for multi-stage gas furnaces

• Compatibility: Select Lennox residential furnace models

 

Typical Applications

 

• Replacement during furnace maintenance or troubleshooting
• Furnace startup issues related to inducer, ignition, or airflow
• Restoring proper operation in high-efficiency, variable or multi-stage heating systems