Aftermarket Motors) Constant Torque Motors

 Key Features:

• Programmable torque levels: Typically, five tabs can be programmed (e.g., 15%, 30%, 50%, 75%, 100%).
• Each tab signals the motor to use a specific percentage of the total torque available.
• Manufacturers specify which tap to use for proper airflow, whether for heating, cooling, or constant air.

Programming Considerations:

• Programming is for efficiency, not speed.
• Each manufacturer may label taps differently and non-linearly.
• Incorrect tap selection can lead to efficiency loss.

Operational Comparison:

• Like PSC motors, increased static pressure can change airflow, but constant torque motors minimize this change.
• Efficiency: Achieves around 80% efficiency, similar to variable speed motors but at a lower cost.
• Universal application and simpler operation compared to variable speed motors.

Installation Tips:

• Check system static pressure and refer to the manufacturer's blower performance chart.
• Use a motor with recommended static pressure close to the system’s actual static pressure for quieter operation.
• Avoid exceeding static pressure recommendations to prevent performance loss and increased noise.