The Carrier KR11AL012 Pulley Fan is a precision-engineered OEM replacement blower pulley designed for large-tonnage commercial HVAC systems and air handlers. Featuring a 1-inch bore and an 11-inch outer diameter, this component is critical for maintaining correct HVAC blower speed and static pressure performance. As a fixed pitch pulley, it ensures consistent belt alignment and optimal power transfer from the drive motor to the fan shaft. Technicians should verify sheave sizing and shaft tolerances during installation to prevent excessive vibration or premature belt wear. Built for heavy-duty industrial applications, this Carrier 11-inch pulley is essential for restoring factory-specified airflow in commercial air handler maintenance. For contractors performing HVAC belt drive system repair, utilizing genuine Carrier HVAC parts like the KR11AL012 ensures the structural integrity of the drive assembly and minimizes mechanical failure in high-demand environments.

Key Performance Specifications

• 1" Bore Diameter: Precision machined for a secure fit on standard motor and blower shafts.
• 11" Pitch Diameter: Engineered for specific RPM requirements to maintain design CFM.
• Durable Cast Construction: Resist warping and surface wear under high torque loads.
• OEM Compatibility: Ensures exact alignment with existing belt profiles and motor sheaves.

Common Questions

What causes vibration in an 11-inch blower pulley?
Vibration is typically caused by shaft misalignment, a loose mounting hub, or debris buildup. Ensure the 1" bore is clear and the keyway is properly seated before tightening set screws.

Can this fixed pulley be used to change blower speed?
No, this is a fixed-diameter component. To adjust airflow, you must verify the drive ratio between this 11" pulley and the motor sheave; changing the diameter will alter the RPM and system static pressure.

Is the KR11AL012 compatible with generic V-belts?
Yes, provided the belt profile matches the groove dimensions. However, always check for wear on the pulley sidewalls, as grooving will lead to belt slippage and reduced efficiency.

Item is Non Cancelable / Non Returnable

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.