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PSC, ECM, Variable Speed: Motor Types, Troubleshooting & Longevity Tips for HVAC

By Matthew Condron

July 9, 2025

The Kalos team members break down the essential differences between PSC, ECM, and variable speed motors in this comprehensive overview for HVAC technicians. Learn about blower and condenser fan motor types, understand how each motor technology handles static pressure, and discover why proper airflow management is critical for system longevity.

Key topics covered include:

PSC (Permanent Split Capacitor) motors and their limitations
ECM (Electronically Commutated Motor) technology and X13 motors
Variable speed motor capabilities and programming
Static pressure issues and their impact on motor life
Airflow testing and adjustment techniques
Common causes of motor failure and prevention strategies
The importance of proper filtration and ductwork sealing

Plus, get practical field tips on using DIP switches, speed taps, and manual references to optimize system performance. Essential viewing for technicians working with modern two-stage and variable speed systems.

#airflow #ecm #hvac #motors #PSC #Variable Speed

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The IAQ Business Case: How testing indoor air quality on every service call creates new revenue streams and differentiates contractors in a commoditized market
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