Honeywell MS8120A1205 Two-Position Spring Return Direct-Coupled Damper Actuator

Product Short Description

Technical Specifications
- Power and Electrical Parameters: The operating voltage is 24 Vac with a tolerance of ±20%, and it works with 50 Hz or 60 Hz frequency. The starting power consumption is 40 VA, and the holding power consumption is 8 VA. It is equipped with two internal auxiliary switches with a switch rating of 250 Vac and 5 A resistive current, and 3 A inductive current. The electrical connection uses an enclosed screw terminal strip that is compatible with 22 – 14 AWG wires.
- Mechanical and Motion Parameters: It has a rated torque of 175 lb-in which is equivalent to 20 Nm, and the maximum stall torque reaches 300 lb-in which is equivalent to 34 Nm. The rotational stroke is 95 ± 3 degrees, and the stroke can be adjusted with mechanical limits in 5-degree increments. The nominal driving time at 60 Hz is 45 seconds, and the maximum spring return time is 20 seconds. The self-centering clamping shaft adapter is compatible with 3/8 to 1.06 inch round shafts or 3/8 to 11/16 inch square shafts.
- Physical Parameters: It has dimensions of 9.72 inches in height, 3.94 inches in width and 2.95 inches in depth, which is equivalent to 247 mm × 100 mm × 75 mm. It weighs 6 pounds which is about 2.72 kg, and adopts an aluminum housing with a plastic access cover. It also has an integral 1/2 inch NPSM conduit connection.
- Environmental Parameters: The operating temperature range is -40°F to 140°F which converts to -40°C to 60°C, and the storage temperature can reach up to 158°F which is 70°C. It can operate normally in an environment with 5% – 95% relative humidity without condensation. The maximum noise during startup is 40 dB(A) at 1 meter, and the noise during holding operation is 20 dB(A) at 1 meter, which achieves nearly silent operation.

Honeywell MS8120A1205 Two-Position Spring Return Direct-Coupled Damper Actuator

Description
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Description

Functional Features
- Fail-Safe Spring Return: It is equipped with a spring return function, and the reset direction can be selected on-site according to actual application needs. When the power supply is cut off or a system fault occurs, the actuator can automatically reset to the preset safe position through the spring force, preventing equipment damage or system operation accidents caused by the stagnation of dampers or valves.
- Strong Adaptability to Shaft Sizes: The self-centering shaft adapter can be adapted to a variety of round and square shafts of different specifications. This universal design eliminates the need for additional customized connecting parts when matching with different types of dampers and valves, which greatly simplifies the installation process and improves the compatibility of the product.
- Convenient Operation and Maintenance: It is equipped with a manual crank with a locking function. During equipment maintenance or system debugging, operators can manually adjust the actuator position through the crank, and the locking function can fix the position to avoid misoperation. The access cover on the actuator facilitates wiring operations during on-site installation.
- Reliable Protection and Certification Compliance: It uses a brush DC submotor with electronic stall protection to prevent motor burnout due to stalling. The metal housing enhances the structural firmness and can resist the impact of the on-site environment. It has obtained UL, cUL, CE and C-Tick certifications, and complies with multiple industry standards, ensuring its safe and stable operation in various application scenarios.
Application Scenarios
- Central HVAC Systems: It is widely used in central air conditioning and ventilation systems of commercial buildings and office buildings. It connects with air volume control dampers in air ducts. It controls the opening and closing or opening degree of dampers according to the temperature and humidity signals of the building automation system, so as to realize the balanced distribution of cold and hot air and maintain a comfortable indoor temperature environment.
- Industrial Ventilation and Air Treatment: In industrial workshops such as electronics factories and chemical plants, it is installed on the dampers of ventilation and exhaust pipelines. It can quickly adjust the damper state according to the concentration of harmful gases or dust in the workshop. It timely discharges pollutants and introduces fresh air to ensure the health of employees and the normal operation of production equipment.
- Fire Protection Ventilation Systems: In the fire protection systems of buildings, it matches the fire-fighting smoke exhaust dampers. When a fire breaks out, the system triggers the actuator to quickly reset through the spring return function, opening the smoke exhaust dampers and closing the normal ventilation dampers. It guides the smoke to be discharged smoothly and prevents the spread of smoke, creating favorable conditions for personnel evacuation and fire fighting.
- Small-Scale Fluid Control Equipment: It can drive small ball valves in the fluid pipelines of small industrial production lines or commercial water supply and heating systems. It realizes the on-off control of fluids such as water and heat transfer oil through two-position signals. It is often used in scenarios such as branch pipeline switching and small-flow fluid regulation to ensure the stability of the fluid supply system.