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Honeywell MN7234A2008

Product Name​
Non-Spring-Return Direct-Coupled Damper and Valve Actuator
Product Introduction​
Honeywell MN7234A2008 is a low-voltage modulating actuator for HVAC air dampers, louvers, ventilation flaps, and ball valves with suitable linkage. It provides 34 Nm torque, 95-degree rotation, and adjustable modulating control for building automation and air-handling systems.
Category:
Description
Technical Specifications​
Torque: 300 lb-in, equal to 34 Nm
Fail mode: non-spring-return, fail-in-place
Control signal: 0/2–10 V DC; 4–20 mA with 500 Ω resistor
Feedback signal: 0/2–10 V DC
Supply voltage: 24 V AC ±15 percent or 24 V DC
Electrical input impedance: 100 kΩ for voltage, 500 Ω for current
Rotation angle: 95 ±3 degrees
Drive time: 95 seconds for full stroke
Power consumption: 8 VA, 6 W driving
Shaft compatibility: 10–27 mm round, 10–18 mm square
Housing material: plenum-rated plastic
Dimensions: 223 mm height, 92 mm width, 80 mm depth
Weight: 1.45 kg
Environmental rating: NEMA 2; IP54 not maintained when mounted upside down
Ambient temperature: -20 °C to +60 °C
Storage temperature: -40 °C to +80 °C
Humidity: 5–95 percent non-condensing
Manual operation: declutch mechanism
End limits: mechanical end stops
Auxiliary switches: field-installable optional switches
Electrical connection: screw terminal strip for 22–14 AWG
Conduit connection: 1/2 inch NPSM integral
Approvals: CE, UL873, cUL C22.2 No. 24, C-Tick
Functional Features​
Self-centering shaft adapter, selectable rotation direction, mechanical position indicator, access cover for wiring, manual declutch, optional auxiliary switches, and patented clamping coupling for direct mounting.
Working Principle​
The control electronics compare the incoming 0/2–10 V or 4–20 mA signal with the actual position feedback. The motor drives the output shaft through gear reduction until feedback matches command. On power loss, the non-spring-return design holds the last position.
Application Scenarios​
Air handling units, fresh-air dampers, return-air dampers, ventilation louvers, HVAC zoning, and modulating ball-valve systems with appropriate linkage.
Structural Characteristics​
Direct-coupled gearmotor, plastic plenum-rated enclosure, metal shaft adapter, screw-terminal compartment, position indicator window, manual declutch lever, DIN-type mounting bracket.
Installation Requirements​
Mount directly on damper or valve shaft using the self-centering adapter. Use 24 V AC or DC isolated supply. Wire control and feedback separately from power conductors. Install bracket vertically or horizontally; avoid inverted mounting if NEMA/IP protection is required. Set rotation direction and end limits before automatic operation.
Usage Precautions​
Use 500 Ω resistor only for 4–20 mA input. Do not exceed shaft diameter range. Keep electrical enclosure dry when not IP54 rated. Check auxiliary switch rating before load connection. Perform manual declutch only when power is removed or according to lockout procedure.
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