Honeywell ML6174A2002 Non-Spring Return Direct Coupled Damper Actuator 70 lb-in 24V Floating

The Honeywell ML6174A2002 is a non-spring return, direct coupled damper actuator (DCA) designed for precise control of VAV terminal unit dampers and Honeywell ball valves in commercial HVAC systems. Operating on 24 VAC (±20%, 50/60 Hz), this actuator delivers 70 lb-in (8.0 N·m) of running and breakaway torque with a 90-second stroke time — ideal for pressure-independent VAV applications requiring fast, reliable damper response.

The ML6174A2002 accepts a floating/SPDT control signal and includes a built-in feedback potentiometer, providing position feedback to the controller for enhanced system accuracy. The actuator mounts directly to damper shafts without the need for linkages or brackets, simplifying installation and reducing mechanical wear points.

Key Features:

• 70 lb-in (8.0 N·m) running and breakaway torque
• 24 VAC input voltage, 2.3W / 0.1A / 2.4 VA power draw
• 90-second stroke timing for 90° travel
• Floating / SPDT control signal input
• Integrated feedback potentiometer for position reporting
• Magnetic coupling provides up to 130 lb-in stall torque — eliminates the need for mechanical end stops
• Selectable stroke angle: 45°, 60°, or 90° clockwise or counterclockwise
• Direct shaft mount — fits 3/8 to 1/2 in. (10–13 mm) square or round damper shafts
• Can be mounted with shaft in any orientation
• Manual declutch feature on all models for ease of installation and manual positioning
• Supports up to two field-addable auxiliary switches (201052 series, sold separately)
• Compatible with Honeywell W7620 Terminal Unit Controller
• Ambient operating range: 20°F to 125°F (-18°C to 50°C)
• UL Component Recognized (File No. E4436, Guide No. XAPX2); UL94-5V rated for plenum applications
• CSA Certified

The ML6174A2002 is part of the ML6174/ML7174 non-spring return DCA family. The ML6174 series uses a floating SPDT control signal, while the ML7174 series accepts a 2–10 VDC or 4–20 mA proportional input. This model is well-suited for pressure-independent VAV systems where a 90-second actuator response is specified.