Honeywell 221455A Crank Arm

The Honeywell 221455A is an infinitely adjustable motor crank arm designed specifically for direct integration with Modutrol IV motors. Engineered as a high-precision damper linkage accessory, this component features a 3/8-inch square shaft adapter, making it the standard replacement for the 221455A/U part number. Its compact geometry is approximately 0.75 inches shorter than the 4074ELY or 7616BR variants, a critical design choice that ensures adequate clearance in confined damper applications where an adapter bracket is not utilized. Constructed from heavy-duty steel with a corrosion-resistant coating, it maintains HVAC actuator compatibility across a wide ambient temperature range from -40°F to 150°F. For technicians managing commercial airflow systems, the 221455A provides the necessary mechanical leverage to translate modulating motor rotation into precise linear or angular damper movement. Whether you are performing a field replacement or a new installation, ensuring the adapter sits flush with the Modutrol motor shaft is essential for maintaining torque transfer and preventing slippage under maximum load conditions.

• Infinite Adjustability: Allows for exact stroke tuning to match specific damper travel requirements without fixed-hole limitations.
• Enhanced Clearance: Shorter arm length prevents interference with screw bosses and housing during full 90 or 160-degree rotation.
• Direct Compatibility: Engineered as a native fit for Honeywell Mod IV series, streamlining linkage assembly and reducing bench time.
• Industrial Durability: Rated for high-cycle applications in harsh mechanical rooms, resisting deformation under consistent actuator torque.

• How do I ensure the crank arm doesn't slip on the shaft? The tension screw must be tightened securely while the adapter is perfectly flush with the motor shaft end to ensure a rigid mechanical bond.
• Can this replace older 221455A/U models? Yes, the 221455A is the current, direct replacement part number for all legacy 221455A/U implementations.
• Will this work with other manufacturers' motors? While optimized for Honeywell Modutrol motors, it fits standard 3/8-inch square shafts, though linkage geometry should be verified for non-Honeywell applications.

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.