The Helios VARD 315/2/2 is a high-pressure duct fan from the RADAX series, directly driven and designed for use in ventilation and air conditioning systems. It features a cylindrical duct casing made of galvanized steel sheet with flanges on both sides, manufactured according to DIN 24155, making it suitable for easy installation in existing ductwork. The impeller is semi-axial and equipped with eight spatially curved blades made of thermoplastic, ensuring efficient air movement. Dynamic balancing according to quality grade G 6.3 as per VDI 2060 and DIN ISO 1940 ensures vibration-free operation. The integrated three-phase squirrel-cage motor is designed with two speed stages in star/delta configuration, enabling speed control via voltage reduction. It is maintenance-free, equipped with thermal contacts for winding monitoring, and features a closed design with sealed, low-noise ball bearings with long-term lubrication.

Applications
This fan is intended for use in industrial and commercial ventilation systems, particularly where high pressure increase is required at medium to high air volumes. It is suitable for applications in production halls, warehouses, office buildings, or in the food industry, where reliable and maintenance-free ventilation is necessary. The maximum air temperature is 60 °C, allowing use in systems with moderate thermal loads. The IP55 protection rating safeguards the motor against dust and splashing water, making the fan suitable for use in damp or slightly contaminated environments.

Functions and Features in Detail
The VARD 315/2/2 includes an integrated guide vane, which stabilizes the airflow within the housing and optimizes performance. The free delivery air volume is 4,670 m³/h, with a maximum pressure increase of 560 Pa. The rated speed is 2,150/2,650 min⁻¹, depending on the operating stage, and the power consumption is 900/1,350 W. The current draw is 1.5/2.4 A at an operating voltage of 400 V, 3-phase, 50 Hz. The insulation class F ensures high thermal resistance of the windings. The sound power level is 91 dB(A), with the sound spectrum ranging between 73 and 87 dB(A) in the frequency range of 250 Hz to 8,000 Hz.

Technology Explained Simply
The two-stage star/delta configuration allows the fan to operate at two different speeds, enabling adjustment of air volume and pressure. Speed control via voltage reduction allows easy adaptation to different operating conditions without requiring additional control devices. The thermal contacts in the motor protect against overheating and automatically switch off the motor if a critical temperature is reached. The closed motor design protects the windings from contamination, and the ball bearings with long-term lubrication significantly reduce maintenance frequency.

Compatibility and Accessories
The fan is designed for use in ducts with a nominal diameter of 315 mm. It can be combined with other components from the Helios RADAX series, such as silencers or air filters, to adapt the ventilation system to specific requirements. The flange connection according to DIN 24155 enables compatible installation with standard ductwork. No specific accessories are included in the delivery scope; the product is supplied without additional mounting accessories.

Installation and Mounting
Installation is done by direct insertion into the duct. The flanges on both sides allow easy fastening using screws and gaskets. The cylindrical shape of the housing and the standardized flange hole pattern facilitate integration into existing systems. Electrical connection requires a 400 V, 3-phase, 50 Hz power supply. No special mounting aids or additional components are included in the delivery scope.

Operational Advantages
The VARD 315/2/2 offers high operational reliability due to its maintenance-free design and integrated monitoring features. The high pressure increase enables use in long or complex duct systems. The IP55 protection rating and robust construction from galvanized steel sheet increase service life and operational safety in demanding environments. The two-stage speed control provides flexibility in adapting to different ventilation requirements.