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Nicotra Gebhardt
Centrifugal Fans double inlet with direct drive forward curved blades

Centrifugal Fans double inlet with direct drive forward curved blades

Product catalog summary

Overview: The document provides technical specifications and guidelines for centrifugal fans with double inlet and direct drive, featuring forward curved blades. It covers efficiency requirements, system configurations, and product offerings by Nicotra Gebhardt.

Efficiency Specifications: Efficiency grade 'N' as per the ErP Directive must be achieved by 2013 and 2015, depending on the fan model. Efficiency is calculated based on electric input power at optimal energy efficiency points, considering total efficiency without speed regulation. A part load compensation factor is applied if speed regulation is present.

Product Offerings: Nicotra Gebhardt offers fan systems meeting ErP requirements, including high-efficiency drives and various motor technologies. The RLM Evo impeller is noted for high system efficiency.

Technical Selection Program: The proSELECTA II program allows users to configure custom fan designs, providing technical data, sound levels, and dimension specifications, ensuring permissible configurations for faster order processing.

Product Descriptions: Various fan models, including DDM, DDMB, and DD, feature double width, double inlet designs with forward curved blades, optimized for high performance and low power consumption, suitable for HVAC applications.

Design and Manufacturing: The DDM range features direct driven fans with compact casings and aerodynamically optimized impellers, designed for dust-free environments and operating at temperatures up to +40°C.

Technical Data and Performance Curves: Detailed technical data and performance curves are provided, including speed control, motor power, and noise levels. Users are advised against using fans in certain operational areas to avoid noise issues.

Technical Specifications: Specifications for direct-driven centrifugal fans include motor power, poles, phases, connection type, mains frequency, maximum power and current consumption, speed, operating capacitor, motor protection class, thermal protection, maximum media temperature, fan weight, and media density. Installation type follows ISO 5801 standards.

Performance Curves: Performance curves illustrate airflow, pressure, and sound power level relationships. Noise ratings are given in decibels, with specific areas marked to avoid due to potential noise issues.

Speed Control: Speed control options include transformer, TRIAC, or inverter, with some models not supporting speed control.

Recommendations and Warnings: Users are advised not to operate fans in grey-marked areas on performance curves to avoid excessive noise. Adherence to technical specifications and installation guidelines is emphasized for optimal performance and safety.

Dimensions: Dimensions for each fan model are provided in millimeters, subject to change.

Specifications Overview: Detailed specifications for direct-driven centrifugal fans include motor details, power and consumption, capacitor and protection, environmental and physical characteristics, installation and standards.

Performance and Control: Speed control options, noise levels, and performance curves are detailed, with important notes on avoiding grey-marked areas on performance curves.

Specifications: High performance centrifugal fans (DDM) are designed with double width, double inlet and direct driven forward curved blades. The fan's scroll is made from galvanized steel, and the impeller is directly mounted on an 'External Rotor' motor. Motors are available in both open and closed frames, suitable for single or three-phase, and can be speed-adjusted via voltage regulation.

Technical Data: Detailed technical data for various models of direct driven centrifugal fans include specifications such as nominal motor power, poles, phases, connection type, mains frequency, maximum power and current consumption, speed, operating capacitor, motor protection class, thermal protection, maximum media temperature, fan weight, and media density.

Performance Curves: Performance curves illustrate airflow and pressure relationships at different speeds and power settings. Noise levels in decibels are indicated for various operating conditions.

Fittings and Accessories: Available fittings and accessories include outlet flanges, flexible connections, mounting feet, terminal boxes, inlet and outlet guards, powder-coating, and TRIAC electronic regulators.

Specifications: Specifications for direct-driven centrifugal fans include volume flow, static pressure, air density at fan inlet, air temperature, maximum power consumption, speed, frequency, sound power level, and weight.

Fan Models and Dimensions: Various DDM fan models with specific dimensions and specifications are listed.

Accessories: Accessories for DDM fans include flanges, flexible connections, terminal boxes, mounting feet, and protection guards.

Motor and Control Units: RVM and RVT motor control units are described for speed regulation of single-phase and three-phase motors.

Safety and Performance: Fans are intended for use in clean air environments and must comply with safety standards. Performance data are derived from tests and are not AMCA certified.

Operating Conditions and Lifespan: Fans are designed for air temperatures ranging from -20°C to +40°C, with an expected lifespan of approximately 20,000 hours.

Speed Regulation: Speed regulation is possible through transformers or electronic regulators.

Frequency Converter: Information on frequency converters for centrifugal fans with induction motors is included.

Specifications: Specifications for frequency inverters and related components include details on single-phase and three-phase AC supplies, protection class, and performance range.

Procedures and Recommendations: Recommendations include observing performance reduction with high clock frequencies and selecting larger inverter units if necessary.

Standards and Compliance: Compliance with EMC basic interference suppression standards and power chokes is mentioned.

Components and Accessories: Various components such as interference suppression filters, line chokes, and motor protection units are listed.

Technical Data and Dimensions: Technical data for frequency inverters, including nominal power, current, and weight, are provided.

Critical Information: Key information includes selecting the correct inverter size based on pulse frequency and the need for additional components to meet EMC requirements.

Specifications: Isolators are categorized based on motor rated power, with model designations indicating key characteristics.

Quality Management: Nicotra Gebhardt adheres to a quality management system certified under DIN EN ISO 9001.

Machine Safety: Fans are not considered machines under the EC Machine Directive but come with a "Declaration of incorporation."

Catalogue Data: Technical data and measurements are subject to change as products develop.

Contact Information: Contact details for Nicotra Gebhardt offices worldwide are provided.

Catalog excerpts

Centrifugal Fans double inlet with direct drive forward curved blades

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The overall picture will decide Complete systems by Nicotra Gebhardt Depending on the model of the fan, the efficiency grade “N” set in accordance with the ErP Directive must be achieved from 2013 and 2015 respectively. Efficiency grade “N” to ErP-Directive Centrifugal fans with backward curved blades without with housing housing static static total Centrifugal fans with forward curved blades with housing static total Nicotra Gebhardt can supply complete systems in all product categories which meet the ErP requirements. We offer highly efficient fan systems A ith matching components and “high...

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Centrifugal Fans double inlet with direct drive forward curved blades-3

Flow rate Media temperature Speed control Casing material Inlet type Double inlet ErP status Single inlet Coated steel Galvanised steel Backward curved blades coated steel Forward curved blades galvanised sheet steel External Inverter

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Centrifugal Fans double inlet with direct drive forward curved blades-4

proSELECTA II Simple and reliable selection proSELECTA II is a technical selection program that allows you to configure your own individually designed fan. It provides you with the opportunity to choose from the entire range of fan types and their associated options. The result from proSELECTA II is the provision of all the technical data for your fan, including sound level data, dimension specifications and accessories. Apart from that, as a registered user, your purchase prices are provided. Additionally fully dimensioned drawings in dxf format are available, which can be downloaded and transferred...

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Centrifugal Fans double inlet with direct drive forward curved blades-5

High performance centrifugal fans DDM double width, double inlet, (DWDI), with built-in, optimised external rotor motor, made of galvanised sheet steel; available in various models; Impeller with forward curved blades of galvanised steel plate High performance centrifugal fans DDMB double width, double inlet, (DWDI), with built-in, brushless DC external rotor motor and external commutation unit, made of galvanised sheet steel; available in various models; Impeller with forward curved blades of galvanised steel plate High performance centrifugal fans DD double width, double inlet, (DWDI), built-in,...

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Centrifugal Fans double inlet with direct drive forward curved blades-6

The best fan for your application! DDM range – direct driven fans Direct driven centrifugal fans of DDM range with forward curved impeller directly mounted on the external rotor motor are the ideal solution for your applications in the HVAC business. The fact of manufacturing by ourselves each fan component – the casing, the impeller and motor – enables us to create fans that perfectly meet the requirements of high performances and low power consumptions. The wide range of different versions and motor types allows you to find the fan exactly matching what you really need. You anyway get the generally...

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Centrifugal Fans double inlet with direct drive forward curved blades-7

This kind of fans are specially conceived for use in dust-free environments, at temperatures up to +40 °C, or higher on selected models. The performance data have been obtained in a laboratory registered by AMCA for AMCA 210/99 air performance testing. Data are not certified by AMCA. We have the right fan for all your application! Many different sizes, versions and motor types are available in the DDM range. Impeller size (width and diameter) up to 15“ Speed variation either by step-transformers or stepless External rotor motor with integrated thermal protector Fan models suitable for 60 Hz supply...

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Centrifugal Fans double inlet with direct drive forward curved blades-8

Direct driven centrifugal fans / DDM / Technical Data Technical Data Speed control Nominal motor power Poles W – Nominal capacitor voltage V Motor protection class Motor thermal class Thermal protection Density of media kg/m³ Mains Connection frequency Hz Max. current consumption Speed A 1/min 0.5 Article number Technical Data Attention! We suggest to do not use the fan in the grey marked area! The noise ratings given in the performance curves are sound power level LWA7, see „Technical Description“. (1) = Speed controllable via Transformer (2) = Speed controllable via TRIAC or Transformer (3)...

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Centrifugal Fans double inlet with direct drive forward curved blades-9

Direct driven centrifugal fans / DDM / Technical Data Technical Data Speed control Nominal motor power Poles W – Nominal capacitor voltage V Motor protection class Motor thermal class Thermal protection Density of media kg/m³ Mains Connection frequency Hz Max. current consumption Speed A 1/min Article number Technical Data Attention! We suggest to do not use the fan in the grey marked area! The noise ratings given in the performance curves are sound power level LWA7, see „Technical Description“. (1) = Speed controllable via Transformer (2) = Speed controllable via TRIAC or Transformer (3) = Speed...

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Centrifugal Fans double inlet with direct drive forward curved blades-10

Direct driven centrifugal fans / DDM / Technical Data Technical Data Speed control Nominal motor power Poles W – Nominal capacitor voltage V Motor protection class Motor thermal class Thermal protection Density of media kg/m³ Mains Connection frequency Hz Max. current consumption Speed A 1/min 0.9 Article number Technical Data Attention! We suggest to do not use the fan in the grey marked area! The noise ratings given in the performance curves are sound power level LWA7, see „Technical Description“. (1) = Speed controllable via Transformer (2) = Speed controllable via TRIAC or Transformer (3)...

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Centrifugal Fans double inlet with direct drive forward curved blades-11

Direct driven centrifugal fans / DDM / Technical Data Technical Data Speed control Nominal motor power Poles W – Nominal capacitor voltage V Motor protection class Motor thermal class Thermal protection Density of media kg/m³ Mains Connection frequency Hz 50/60 Max. current consumption Speed A 1/min Article number Technical Data Attention! We suggest to do not use the fan in the grey marked area! The noise ratings given in the performance curves are sound power level LWA7, see „Technical Description“. (1) = Speed controllable via Transformer (2) = Speed controllable via TRIAC or Transformer (3)...

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Centrifugal Fans double inlet with direct drive forward curved blades-12

Direct driven centrifugal fans / DDM / Technical Data Technical Data Speed control Nominal motor power Poles W – Nominal capacitor voltage V Motor protection class Motor thermal class Thermal protection Density of media kg/m³ Mains Connection frequency Hz Max. current consumption Speed A 1/min Article number Technical Data Attention! We suggest to do not use the fan in the grey marked area! The noise ratings given in the performance curves are sound power level LWA7, see „Technical Description“. (1) = Speed controllable via Transformer (2) = Speed controllable via TRIAC or Transformer (3) = Speed...

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