Johnson Controls DMPR-KC051 Crankarm

The Johnson Controls DMPR-KC051 is a professional-grade damper linkage crankarm designed for precise airflow control in commercial HVACR systems. Built for compatibility with a 3/8" shaft diameter, this high-performance accessory facilitates the reliable transmission of actuator torque to damper blades or pin extensions. The adjustable radius?ranging from 1 inch to 2 3/4 inches?allows technicians to fine-tune the stroke length and mechanical advantage, ensuring 100% damper closure and optimal HVAC system efficiency. Engineered for air handling units (AHUs) and economizer sections, the DMPR-KC051 provides a secure, slip-free connection using robust fastening hardware designed for high-cycle applications. Whether you are performing a damper actuator replacement or a new building automation system (BAS) installation, this adjustable crankarm delivers the necessary flexibility to accommodate various linkage rod geometries and torque requirements.

• Shaft Compatibility: Specifically bored for standard 3/8-inch damper shafts to ensure a secure fit without play.
• Adjustable Stroke: Features a slotted design for adjustable radius settings between 1" and 2.75", allowing for custom timing and stroke adjustments.
• Durable Construction: Manufactured from heavy-duty materials to withstand the mechanical stress of HVAC damper modulation.
• Precision Control: Critical for achieving accurate outdoor air intake and exhaust air management in pneumatic or electric control setups.
• Versatile Application: Ideal for control damper accessories, economizer linkage, and actuator-to-shaft coupling.

Common Questions

How do I adjust the radius on the DMPR-KC051 for proper damper travel?
The radius is adjusted by loosening the swivel ball joint or rod connector and sliding it along the crankarm slot to the desired position between 1" and 2-3/4". This determines the damper blade rotation relative to the actuator?s 90-degree stroke.

Is this crankarm compatible with square or round shafts?
The DMPR-KC051 is engineered for 3/8" diameter shafts. While it is primarily used on round damper shafts, it can interface with pin extensions and drive shafts of the same nominal size commonly found in Johnson Controls assemblies.

Can this be used with both spring-return and non-spring-return actuators?
Yes, as a passive linkage component, it is compatible with any damper actuator that utilizes a crankarm drive, provided the torque requirements of the damper do not exceed the mechanical limits of the linkage assembly.

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.