Lennox 25A54 ECM Constant Torque Blower Motor 607421-63 3/4 HP 115V Pre-Programmed 5 Speed 300–1200 RPM

 

Overview

The Lennox 25A54 ECM Constant Torque Blower Motor (607421-63) is a factory pre-programmed replacement motor designed for reliable airflow performance in compatible Lennox HVAC systems. This 3/4 HP ECM motor operates on 115 VAC and delivers consistent torque across multiple speeds, helping maintain proper airflow while improving overall system efficiency and comfort.

Built with electronically commutated motor technology, this blower motor automatically adjusts output to match system demand, reducing electrical consumption compared to standard PSC motors. It is pre-programmed from the factory, eliminating the need for field programming and simplifying installation for service technicians and contractors.

 

Key Features

3/4 HP ECM constant torque blower motor
Factory pre-programmed for direct replacement applications
Operates on 115 VAC power supply
Five selectable speeds for flexible airflow control
Speed range from approximately 300 to 1200 RPM
Delivers consistent airflow under varying static pressure conditions
Designed for long service life and quiet operation

 

Applications

This motor is used in select Lennox air handlers and gas furnace blower assemblies where a constant torque ECM motor is specified. Always verify unit model and part compatibility before installation.

 

Technical Specifications

Manufacturer: Lennox
Part Number: 25A54
Alternate / Factory Number: 607421-63
Motor Type: ECM Constant Torque
Horsepower: 3/4 HP
Voltage: 115 VAC
Phase: Single Phase
Speeds: 5
Speed Range: 300–1200 RPM
Programming: Factory pre-programmed

 

Why Choose This Motor

The Lennox 25A54 ECM blower motor provides dependable performance, reduced energy usage, and stable airflow across operating conditions. Its constant torque design helps protect system components while maintaining comfort, making it an ideal OEM replacement for failed or aging blower motors in compatible Lennox systems.