Product Short Description
Product Introduction The Honeywell MN7234A2008 is a 34 Nm (300 lb-in) non-spring return rotary damper actuator designed for modulating and floating control applications. It provides precise position control for air dampers, ventilation flaps, louvers, and rotary ball valves in HVAC and building automation systems. The actuator features a patented self-centering shaft adapter, manual declutch adjustment, and selectable rotation direction for installation flexibility.
Description
Technical Specifications
- Torque Rating: 34 Nm (300 lb-in)
- Power Supply: 24 VAC ±20%, 50/60 Hz; 24 VDC -10% to +20%
- Power Consumption: 8 VA / 6 W
- Control Signal: 0/2-10 VDC (4-20 mA with 500 Ohm resistor)
- Rotation Stroke: 95 degrees
- Running Time: 95 seconds (60 Hz) / 110 seconds (50 Hz or DC supply)
- Operating Temperature: -20°C to +60°C (-5°F to +140°F)
- Storage Temperature: -40°C to +80°C (-40°F to +175°F)
- Humidity Range: 5–95% non-condensing
- Protection Rating: IP54 (non-USA models); NEMA 2 (USA models)
- Weight: 1.35 kg (3 lbs)
- Noise Level: ≤40 dB(A) at 1 meter
- Mechanical Life: 60,000 full strokes; 1.5 million repositions
Functional Features
- Patented self-centering shaft adapter for simplified installation
- Access cover for convenient wiring and terminal access
- Declutch mechanism for manual position adjustment
- Mechanical end stops for travel limitation
- Field-installable auxiliary switch options
- Rotation direction selectable via onboard switch
- Mountable in any orientation (IP54 rating does not apply when upside down)
- Mechanical position indicator for visual status verification
- Voltage feedback signal for position verification
Application Scenarios
- HVAC air handling unit damper control
- Ventilation system flap and louver positioning
- Rotary ball valve control in building systems
- Variable air volume (VAV) box damper modulation
- Commercial building air distribution systems
- Industrial ventilation and exhaust control
- Compatible with up to 85 sq. ft. of seal-less damper area
Working Principle The actuator receives a control signal (0-10 VDC or 4-20 mA) from a building controller or thermostat. An internal drive motor rotates the output shaft through a gear train, positioning the connected damper or valve to the angle corresponding to the control signal. Position feedback circuitry ensures accurate positioning and provides a feedback signal to the control system.
Installation Requirements
- Mount directly to damper or valve shaft using supplied shaft adapter
- Ensure shaft diameter matches adapter specifications
- Provide 24 VAC/VDC power supply within tolerance range
- Connect control signal wiring to proper terminals
- Allow sufficient clearance around actuator for manual access and wiring
- Mount in orientation that maintains IP54 protection rating
Operating Notes
- Do not exceed rated torque capacity to prevent gear damage
- Perform regular inspection of shaft connections and mounting hardware
- Keep access cover closed during normal operation to maintain protection rating
- Adjust rotation direction switch only when power is disconnected
- Calibrate control signal range to match application requirements
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