Johnson Controls LVR27A-600 Damper Crankarm

The Johnson Controls LVR27A-600 Damper Crankarm is a heavy-duty linkage component engineered for precise airflow regulation in commercial HVAC systems. Designed for field installers and facility technicians, this crankarm is compatible with 7/16-inch or 1/2-inch diameter damper shafts, providing a secure, non-slip mechanical connection. It features an adjustable crank radius ranging from 3/4 inch to 4-1/2 inches, allowing for the fine-tuning of stroke length and torque delivery between the actuator and the damper blades. By utilizing the maximum radius settings, technicians can linearize damper airflow characteristics and optimize the travel time of motor actuators, which is essential for stable building automation control. This HVAC damper linkage part is typically utilized in pneumatic or electronic actuator assemblies, such as the M100 series, to facilitate manual or automated adjustments. Built to withstand the rigorous demands of air handling units (AHUs), the LVR27A-600 ensures reliable damper blade positioning and long-term operational efficiency without the need for constant recalibration in the field.

• Universal Shaft Compatibility: Fits both 7/16" and 1/2" shafts, reducing the need for multiple SKUs on the service truck.
• Wide Adjustment Range: The .75" to 4.50" adjustable radius provides the flexibility needed to match actuator torque to specific damper resistance.
• Enhanced Torque Delivery: When paired with qualified actuators, the linkage ratio can increase effective torque for demanding high-static applications.
• Durable Construction: Engineered to maintain precise louver positioning in high-cycle commercial environments.

What shaft sizes does the LVR27A-600 support?
This crankarm is specifically designed to mount onto 7/16-inch or 1/2-inch diameter damper shafts using a standard set-screw or bolt-tightening mechanism.

Can this be used for both pneumatic and electric actuators?
Yes, it is a universal mechanical linkage component frequently used in Johnson Controls pneumatic and electronic actuator systems to bridge the drive shaft and the damper blades.

What is the maximum radius adjustment?
The arm allows for a radius adjustment of up to 4-1/2 inches, which is critical for achieving a full 90-degree damper rotation from shorter actuator strokes.

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.