VKM 250 EC

Inline centrifugal fan with the air flow up to 1230 m³/h in steel casing.
  • EC-motors, high level of efficiency
  • 100% speed controllable

EC technology is intelligent technology; using integral electronic control which eliminates the slip losses in the motor and ensures that the motor always runs at optimal load.

This guarantees that the proportion of energy utilized effectively is many times higher and the energy usage considerably lower compared with AC motors.

EC fans are notable for their economical use of energy and excellent ease of control. They can be varied in speed to match the airflow demand, and operate at high efficiency levels. For the same air volume, they consume distinctly less energy than AC fan drives.

Another special feature of EC fans is their energy-saving potential not only at full load, but especially at part-load. When operating at part-load, the energy used is much lower than with an asynchronous motor of equivalent output.

Reduced energy usage guarantees a drop in operating costs.

Description

APPLICATION

  • Supply and exhaust ventilation systems for commercial, office and other public or industrial premises.
  • EC motors applied in VKM fans reduce energy demand by about 35 % and ensure high aerodynamic performance and low noise level.
  • Such characteristics are of special importance for ventilation of public premises as banks, supermarkets, restaurants, hotels, installation close to residential buildings and for domestic application, e.g. ventilation of private pools.
  • EC motors enable integration of several fans into a unified networks and their centralized control.
  • The steel casing ensures reliable operation of the fan in case of its outside installation.
  • The fan are designed for connection to Ø 250 mm air ducts.

DESIGN

  • The fan casing is made of polymer coated steel.
  • New technologies for manufacture of the fan components let attain the total casing air tightness.

MOTOR

  • The impellers with backward curved blades are powered with a high efficient electronically commutated (EC) direct current motor with external rotor.
  • As of today, such motor type is the most advanced solution for energy saving.
  • EC motors are featured by high performance and the best speed controllable range.
  • Premium efficiency reaching up to 90 % is the absolute advantage of electronically commutated motors.
  • The motors are equipped with ball bearings for longer service life of the fan (40 000 hours).
  • For precise features, safe operation and low noise, each turbine is dynamically balanced while assembly.
  • Motor ingress protection rating IP44.

SPEED CONTROL

  • The fan is controlled with the external control signal 0-10 V (air flow control as a function of temperature, pressure, smoke conditions and other parameters).
  • Should the control value get changed, the EC motor adjusts its speed and the fan boosts as much air flow to the ventilation system as required.
  • Maximum speed of the fan does not depend on the current frequency and it can operate at 50 or 60 Hz mains supply.
  • The fans may be integrated into the unified dispatch system.
  • The respective software enables to control all the fan integrated into the system.
  • The computer displays all the system parameters.
  • Each fan in the system may be individually adjusted.

MOUNTING

  • The fans may be installed at any angle.
  • The fixing brackets that are included into the delivery set are used to facilitate the fan mounting to the wall.
  • The fan is connected to power mains through the external terminal box.

Characteristics

ParameterVKM 250 ECMeasurement unit
Low-powered motorno
High-power versionno
Phase1˜
Voltage230V
Frequency50/60Hz
Sound pressure level at 3 m distance46dBА
Air capacity1230m³/h
Power consumption164W
Current1.15A
EC motoryes
RPM2900min-1
Max. transported air temperature-25 +60°С
Protection ratingIP X4
Duct diameter250mm
Weight5.1kg
Designcentrifugal
Casing materialpolymer coated steel
Outdoor mountingyes
SEC Class
Ductfor round air ducts
Typesupply and exhaust
Mountingoutdoor mounting, Inline

Additional characteristics

Sound-power level, A – weightedOctave frequency band [Hz]LpA, 3 m [dBА]LpA, 1 m [dBА]
HzGen.631252505001000200040008000
LwA to inletdBА9061778583848176656979
LwA to outletdBА8965777483858378646979
LwA to environmentdBА6729485760635951374656

Dimensions

ParameterValueMeasurement unit
∅D248mm
ØD1345mm
B395mm
B1355mm
H435mm
L250mm
L125mm
L230mm
L340mm

vkm ec dimensions 2502 Inline centrifugal fan with the air flow up to 1230 m³/h in steel casing. EC-motors, high level of efficiency 100% speed controllable EC technology is intelligent technology; using integral electronic control which eliminates the slip losses in the motor and ensures that the motor always runs at optimal load. This guarantees that the proportion of energy utilized effectively is many times higher and the energy usage considerably lower compared with AC motors. EC fans are notable for their economical use of energy and excellent ease of control. They can be varied in speed to match the airflow demand, and operate at high efficiency levels. For the same air volume, they consume distinctly less energy than AC fan drives. Another special feature of EC fans is their energy-saving potential not only at full load, but especially at part-load. When operating at part-load, the energy used is much lower than with an asynchronous motor of equivalent output. Reduced energy usage guarantees a drop in operating costs.

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