NTDZ SWIRL DIFFUSER WITH THERMOSTATIC ACTUATOR Characteristics: Round aluminium swirl diffuser with movable steel vanes regulated by a thermostatic actuator. Intended use The NTDZ diffusers are designed for low and medium pressure ventilation systems. They make it possible to achieve the swirl airflow. They are especially recommended for rooms with a height of 3 to 15 meters, where heating and cooling is carried out by a ventilation system. Thanks to the thermostatic actuator, the NTDZ can automatically (without an external power source or control) change the geometry of the air supply depending on the temperature of the supplied air. The NTDZ diffusers have movable steel vanes, set by means of a thermostatic actuator with the operating range from +15°C to +40°C. The diffuser body is made of aluminium. The device is entirely powder-coated with RAL9010 white paint. They can also be coated in another RAL colour on request. Operation method The NTDZ uses a thermostatic actuator to adjust the vanes, which does not require electrical power. When cool air is supplied through the diffuser, the actuator sets the diffuser vanes to the horizontal air supply. When the air flowing through the diffuser is warm, the vanes are set to vertical supply. The maximum inclination angle of the vanes for the heating and cooling modes can be changed thanks to two limiters in the diffuser body. øD1 Figure 1. NTDZ diffuser dimensions. For supplying warm air (heating), it is recommended to set the diffuser vanes at an angle of 10 degrees. For supplying cool air (cooling), it is recommended to set the vanes at an angle of 80 degrees. Swirl diffuser with thermostatic actuator Vane adjustment Figure 2. Dimensions of SR rectangular plenum boxes for NTDZ diff

Table 1. Standard dimensions of NTDZ diffusers and plenum boxes. The diffusers may be mounted to a plenum box or ventilation duct by means of 05 screws with no more than 125 mm spacing. If the diffuser is mounted directly to the ventilation duct (without a plenum box), a straight ventilation duct segment of minimum length equal to 1.5* 0P should be placed upstream of the diffuser. Quick selection Chart 1. Recommended installation height. Swirl diffuser with thermostatic actuator

Chart 2. Recommended minimum distance between diffusers Stream range NTDZ 200 COOLING Chart 3. The jet stream range in cooling mode of the NTDZ 200 diffuser. Chart 4. The jet stream range in heating mode of the NTDZ 200 diffuser. Swirl diffuser with thermostatic actuator

Chart 5. The jet stream range in cooling mode of the NTDZ 250 diffuser. Chart 6. The jet stream range in heating mode of the NTDZ 250 diffuser. Chart 7. The jet stream range in cooling mode of the NTDZ 315 diffuser. Swirl diffuser with thermostatic actuator

Chart 8. The jet stream range in heating mode of the NTDZ 315 diffuser. NTDZ 400 COOLING Chart 9. The jet stream range in cooling mode of the NTDZ 400 diffuser. HEATING Chart 10. The jet stream range in heating mode of the NTDZ 400 diffuser. Swirl diffuser with thermostatic actuator

Vertical throw length, L [m] Terminal velocity to neck velocity, V|/Verr Chart 11. The jet stream range in cooling mode of the NTDZ 500 diffuser. HEATING Chart 12. The jet stream range in heating mode of the NTDZ 500 diffuser. Terminal velocity to neck velocity, V/Veft Temperatune difference, AT [K] Blades angle Temperature difference, AT [K] Chart 13. The jet stream range in cooling mode of the NTDZ 630 diffuser. Swirl diffuser with thermostatic actuator

Chart 14. The jet stream range in heating mode of the NTDZ 630 diffuser. Pressure drop Chart 15. Pressure drop of NTDZ diffuser with blades in 45-degree position. Swirl diffuser with thermostatic actuator

Acoustic data NTDZ - Swirl diffuser with thermostatic actuator When ordering, please provide information in accordance with the following pattern: Plenum box as per the configuration below: NTDZ - <S> - AL<RAL> / <ADD> SR <I> - <H> - <K><D><R> * Optional values - if not specified, default values will be used ** For more information see the accessories sheet Sample order: