Honeywell ms7103a1021/u Damper Actuator 27 In-lb 24 Vac

Product Description

The HONEYWELL ms7103a1021/u is a direct-coupled spring-return damper actuator designed for precise analog control of HVAC dampers in commercial and residential air-handling systems. It operates on a 24 VAC supply and accepts a 2-10 VDC analog control signal for proportional positioning. The actuator delivers 27 inch-pounds of torque and draws 4 VA, making it well-suited for modulating damper applications where fail-safe return-to-position is required. A self-centering shaft adapter is included, simplifying installation across a range of damper shaft sizes without the need for additional adapters.

This actuator is used in variable air volume (VAV) systems, mixed-air damper assemblies, and zone control applications where proportional damper positioning is needed. The spring-return mechanism ensures the damper moves to a defined safe position on loss of power, a critical requirement in many commercial HVAC designs. Licensed HVAC technicians typically install this unit as part of a building automation or direct digital control (DDC) system. It is appropriate for both new construction and retrofit installations where a low-voltage analog actuator is specified.

Key Features

• 27 inch-pounds of output torque for reliable damper engagement
• Spring-return fail-safe operation returns damper to defined position on power loss
• 2-10 VDC analog control signal for proportional modulation
• 24 VAC nominal supply voltage at 4 VA power draw
• Direct-coupled mounting eliminates linkage hardware
• Self-centering shaft adapter accommodates a range of shaft sizes

Compatibility

Designed as an OEM-style replacement or new-installation actuator for direct-coupled damper applications requiring 24 VAC analog proportional control in commercial and residential HVAC systems.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with low-voltage control wiring and building automation systems. Disconnect and lock out power to the air-handling unit and control panel before mounting or wiring the actuator. The direct-coupled design clamps directly onto the damper shaft — no crank arm or linkage is required. Verify control signal polarity and voltage range at the DDC output before applying power to avoid actuator damage.