Belimo NF24A - User Manual

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Summary

Technical Data

Electrical Data

Nominal voltage, voltage range, power consumption, connection details.

Functional Data

Torque, direction of rotation, manual override, angle of rotation, running time, sound power level, service life, position indication.

Safety

Protection class, degree of protection, EMC, certification, mode of operation, rated impulse voltage, control pollution degree, ambient temperature, humidity.

Dimensions and Weight

Dimensions and weight specifications for the actuator.

Safety Notes

Product Features

Mode of operation, simple direct mounting, manual override, adjustable angle of rotation, high operational reliability.

Electrical Installation

Wiring diagram and notes for connecting the actuator.

Accessories

Electrical and mechanical accessories available for the actuator.

Dimensions and Dimensional Drawings

Variant 1 a: 3;4-Spindle Clamp (EU Standard)

Damper spindle size and length compatibility for Variant 1a.

Variant 1 b: 1-Spindle Clamp (EU Standard)

Damper spindle size and length compatibility for Variant 1b.

Variant 2: 1;2-Spindle Clamp (Optional)

Damper spindle size and length compatibility for Variant 2.

Wiring Diagrams and Connections

AC 24 V; DC 24 V Wiring

Wiring diagram and terminal connections for AC 24V/DC 24V models.

AC 230 V Wiring

Wiring diagram and terminal connections for AC 230V models.

AC 24-240 V; DC 24-125 V Wiring

Wiring diagram and terminal connections for AC 24-240V/DC 24-125V models.

Summary

Technical Data

Electrical Data

Nominal voltage, voltage range, power consumption, connection details.

Functional Data

Torque, direction of rotation, manual override, angle of rotation, running time, sound power level, service life, position indication.

Safety

Protection class, degree of protection, EMC, certification, mode of operation, rated impulse voltage, control pollution degree, ambient temperature, humidity.

Dimensions and Weight

Dimensions and weight specifications for the actuator.

Safety Notes

Product Features

Mode of operation, simple direct mounting, manual override, adjustable angle of rotation, high operational reliability.

Electrical Installation

Wiring diagram and notes for connecting the actuator.

Accessories

Electrical and mechanical accessories available for the actuator.

Dimensions and Dimensional Drawings

Variant 1 a: 3;4-Spindle Clamp (EU Standard)

Damper spindle size and length compatibility for Variant 1a.

Variant 1 b: 1-Spindle Clamp (EU Standard)

Damper spindle size and length compatibility for Variant 1b.

Variant 2: 1;2-Spindle Clamp (Optional)

Damper spindle size and length compatibility for Variant 2.

Wiring Diagrams and Connections

AC 24 V; DC 24 V Wiring

Wiring diagram and terminal connections for AC 24V/DC 24V models.

AC 230 V Wiring

Wiring diagram and terminal connections for AC 230V models.

AC 24-240 V; DC 24-125 V Wiring

Wiring diagram and terminal connections for AC 24-240V/DC 24-125V models.

The Belimo NF24A is a spring return actuator designed for adjusting air dampers in ventilation and air conditioning systems within buildings. It is suitable for air dampers up to approximately 2 m² and operates with a nominal voltage of AC/DC 24 V, providing open-close control.

Function Description:

The actuator operates by moving the damper to its operating position while simultaneously tensioning an internal return spring. In the event of a power supply interruption, the damper is automatically returned to a safety position by the force of the spring. This ensures that the damper defaults to a safe state during power outages. The actuator is overload-proof, eliminating the need for limit switches, and automatically stops when the end stop is reached, enhancing its reliability and operational safety.

Important Technical Specifications:

Electrical Data:

Nominal Voltage: AC 24 V, 50/60 Hz / DC 24 V
Nominal Voltage Range: AC 19.2 ... 28.8 V / DC 21.6 ... 28.8 V
Power Consumption:
- In operation: 6 W @ nominal torque
- At rest: 2.5 W
- Total: 8.5 VA
Connection: Cable 1 m, 2 x 0.75 mm² (for wire sizing)

Functional Data:

Torque:
- Motor: Min. 10 Nm @ nominal voltage
- Spring return: Min. 10 Nm
Direction of Rotation: Can be selected by mounting L/R.
Manual Override: Features a hand crank and an interlocking switch.
Angle of Rotation: Maximum 95°, adjustable with a mechanical end stop.
Running Time:
- Motor: ≤75 s (0 ... 10 Nm)
- Spring return: <20 s @ -20 ... 50°C / max. 60 s @ -30°C
Sound Power Level:
- Motor: ≤45 dB (A)
- Spring return: ≤62 dB (A)
Service Life: Minimum 60,000 emergency positions
Position Indication: Mechanical

Safety and Environmental Data:

Protection Class: III Extra low voltage, UL Class 2 Supply
Degree of Protection: IP54, NEMA2, UL Enclosure Type 2
EMC: CE according to 2004/108/EC
Certification: Certified to IEC/EN 60730-1 and IEC/EN 60730-2-14, cULus according to UL 60730-1A and UL 60730-2-14, and CAN/CSA E60730-1:02.
Mode of Operation: Type 1.AA
Rated Impulse Voltage: 0.8 kV
Control Pollution Degree: 3
Ambient Temperature: -30 ... +50°C
Non-operating Temperature: -40 ... +80°C
Ambient Humidity: 95% r.h., non-condensing

Physical Characteristics:

Weight: Approximately 1.8 kg

Usage Features:

Simple Direct Mounting: The actuator can be directly mounted onto the damper spindle using a universal spindle clamp. An anti-rotation strap is supplied to prevent the actuator from rotating, ensuring stable operation.
Manual Override: A hand crank allows for manual operation of the damper. The damper can be locked in any position using an interlocking switch. Unlocking can be done manually or automatically by applying the operating voltage.
Adjustable Angle of Rotation: The angle of rotation is adjustable with a mechanical end stop, providing flexibility for different damper requirements.
High Operational Reliability: The actuator is designed to be overload-proof and does not require limit switches, stopping automatically when the end stop is reached. This design contributes to its robust and reliable performance.
Electrical Installation: It is recommended to connect the actuator via a safety isolation transformer. Parallel connection of multiple actuators is possible, provided the performance data is observed.
Accessory Options: The NF24A supports various accessories, including an auxiliary switch unit (S2A-F) and a feedback potentiometer unit (P200A-F), which can extend its functionality for specific applications.

Maintenance Features:

Maintenance-Free: The Belimo NF24A is designed to be maintenance-free, reducing the need for periodic checks or servicing. This contributes to lower operational costs and increased system uptime.
Durable Design: The robust construction and high-quality components ensure a long service life, with a minimum of 60,000 emergency positions, indicating its durability and reliability over time.

Safety Notes:

The actuator is not intended for use outside its specified field of application, particularly in aircraft or other airborne transport means.
Installation must be performed by suitably trained personnel in compliance with all legal regulations and authority requirements.
The device should only be opened at the manufacturer's site, as it contains no user-serviceable parts.
The cable must not be removed from the device.
When calculating required torque, specifications from damper manufacturers (cross-section, design, installation site) and airflow conditions must be considered.
The device contains electrical and electronic components and must not be disposed of as household refuse; all local regulations must be observed.