Reznor 115681 Motor

The Reznor 115681 Motor is a high-torque 24V proportional damper motor engineered for heavy-duty airflow modulation in commercial and industrial HVAC systems. This spring-return actuator is electronically and physically identical to the Honeywell M9175A1051, providing a direct-fit replacement for legacy Modutrol IV systems using Series 90 control circuits. With a 60 in-lb torque rating and a nominal 30-second timing for a 90-degree stroke, this motor ensures precise positioning of outside air, return air, and mixed-air dampers to maintain building pressure and energy efficiency.

Built with a dual-ended shaft and a die-cast aluminum housing, the Reznor 115681 is designed for the rigors of mechanical rooms, boasting an oil-immersed gear train for extended service life. It operates on a 135-ohm feedback circuit, making it a critical component for modulating damper control applications. The unit features NEMA 3 weather protection when mounted vertically, allowing for installation in both indoor and outdoor environments. This HVAC replacement motor includes quick-connect terminals and supports field-added auxiliary switches for sequence signaling, ensuring seamless integration into complex air handling sequences.

• Universal Compatibility: Direct OEM replacement for Honeywell M9175A1051, reducing diagnostic and installation time during service calls.
• High-Torque Performance: The 60 in-lb output provides enough breakaway force to overcome seized dampers or large-scale louvers.
• Reliable Fail-Safe: Integral spring return logic automatically drives the damper to the closed position during a power interruption.
• Flexible Actuation: Supports field-adjustable strokes between 90° and 160° for custom venting and economizer setups.
• Industrial Build: Oil-immersed internal components ensure smooth operation in temperatures ranging from -40°F to 150°F.

Is the 115681 a direct swap for the M9175A1051?
Yes, this motor is the exact same unit, manufactured to the same Modutrol IV specifications for use in Reznor and other commercial equipment.

Does this motor include the 220738A adapter bracket?
Replacement motors typically include an adapter bracket to match the shaft height of older-generation Modutrol motors, ensuring damper linkage alignment.

Can I use this with a 0-10V or 4-20mA signal?
This is a standard 135-ohm Series 90 motor. While it natively uses proportional resistance, it can be adapted to electronic control signals using Honeywell interface modules like the Q7230A.

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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.