VC 4-75 VZ #4 w/motor 4VR 63 B6 0.25 kW 1000 rpm, execution 1

Low-pressure centrifugal fan of the VC 4-75 #4 series (VR 88-72.1-5.5, VR 80-75-5) with electric motor Electric motor 4VR 63 B6 0.25 Power kW 1000 Vol./Min made from dissimilar materials for explosive environments

This fan is intended for ventilation or air conditioning systems handling explosive gas-vapor-air mixtures of categories 1 and 2, groups T1, T2, T3, according to the classification of the "Rules for Electrical Installations" (PUE), which do not cause accelerated corrosion of the materials of the fan’s airflow section. These mixtures must not exceed a temperature of 80 °C, and the content of fibrous materials, sticky substances, dust, and other solid impurities must not exceed 100 mg/m³ under moderate (U) climate conditions (placement category 3) and tropical (T) climate conditions (placement category 2) according to DSTU 15150. The permissible ambient temperature ranges from -40°C to +40°C (+40°C when using electric motors of tropical design).

The housings and impeller blades of explosion-proof fans are made from material pairs (Steel-Brass or Steel-Aluminum) that are not hazardous in terms of ignition from friction sparks according to DSTU 22782.0-81.

Components of the centrifugal fan VC 4-75 #4 (VR 88-72.1-5.5, VR 80-75-5) available separately:

• Fan VC 4-75 #4 (VR 88-72.1-5.5, VR 80-75-5) without electric motor
• Impeller of the fan VC 4-75 #4 (VR 88-72.1-5.5)
• Casing (housing) of the fan VC 4-75 #4 (VR 80-75-5)
• Electric motor Electric motor 4VR 63 B6 0.25 Power kW 1000 Vol./Min for the fan VC 4-75 #4

General specifications of centrifugal fans VC 4-75 #4 (VR 88-72.1-5.5, VR 80-75-5) with electric motor Electric motor 4VR 63 B6 0.25 Power kW 1000 Vol./Min made from dissimilar metals:

• Low pressure
• Single-side suction
• Backward-curved blades
• 12 blades
• Rotation direction – right and left
• Manufactured in accordance with TU U 28.2-24881057-003:2023
• Material – dissimilar metals

Purpose of centrifugal fans VC 4-75 VZ #4 w/motor 4VR 63 B6 0.25 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5)

This fan is intended for ventilation or air conditioning systems handling explosive gas-vapor-air mixtures of categories 1 and 2, groups T1, T2, T3, according to the classification of the "Rules for Electrical Installations" (PUE), which do not cause accelerated corrosion of the materials of the fan’s airflow section. These mixtures must not exceed a temperature of 80 °C, and the content of fibrous materials, sticky substances, dust, and other solid impurities must not exceed 100 mg/m³ under moderate (U) climate conditions (placement category 3) and tropical (T) climate conditions (placement category 2) according to GOST 15150. The permissible ambient temperature ranges from -40°C to +40°C (+40°C when using electric motors of tropical design).

Application of centrifugal fans VC 4-75 VZ #4 w/motor 4VR 63 B6 0.25 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5):

• Air conditioning systems
• Ventilation systems
• Air heating systems
• Other sanitary and industrial purposes

The centrifugal fan VC 4-75 VZ #4 w/motor 4VR 63 B6 0.25 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5) is operated under moderate climate conditions with ambient temperatures from -40°C to +40°C. The temperature of the transported medium must not exceed 80°C.

Operating principle of the centrifugal fan VC 4-75 VZ #4 w/motor 4VR 63 B6 0.25 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5)

Air, by receiving energy from the impeller blades, enters the fan under the influence of centrifugal force at a 90-degree angle and is directed radially to the spiral scroll casing. Inside the scroll, as it moves along the spiral-shaped housing, the air is directed under pressure to the fan outlet.

Completeness of the centrifugal fan VC 4-75 #4 made of dissimilar metals

The fan VC 4-75 #4 (VR 88-72.1-5.5, VR 80-75-5) with the electric motor Electric motor 4VR 63 B6 0.25 Power kW 1000 Vol./Min consists of the following main components:

• Spiral casing
• Impeller
• Base frame
• Collector
• Electric motor Electric motor 4VR 63 B6 0.25 Power kW 1000 Vol./Min

The impeller consists of a front and rear disk, 12 sheet metal blades, and a hub.

The base frame of the fan is welded. The base has an opening for installation on vibration isolators or a foundation. The electric motor and cover are mounted on the base frame.

The conical collector for directing air to the impeller is fixed to the inlet pipe. The overlap between the collector and the front disk of the impeller is adjusted by axial movement of the collector inside the inlet pipe.

Orientation of the radial fan casing with right-hand (RH) and left-hand (LH) rotation, as viewed from the suction side:

• a) Right-hand rotation
• b) Left-hand rotation

Note on placement categories depending on climatic conditions:

Category 1: For outdoor operation (exposure to the full range of climatic factors typical for the respective macroclimatic regions).

Category 2: For operation under a canopy or in rooms where temperature and humidity fluctuations are not significantly different from those outdoors and external air has relatively free access, for example, in tents, vehicle bodies, trailers, uninsulated metal enclosures, or the casing of equipment rated for Category 1 (no direct exposure to sunlight and precipitation).

Category 3: For operation in enclosed spaces with natural ventilation and without artificially controlled climate conditions, where fluctuations of temperature and humidity and the impact of sand and dust are significantly lower than outdoors, for example, in insulated metal, stone, concrete, or wooden buildings (no exposure to precipitation, direct sunlight, significantly reduced wind, and significantly reduced or no exposure to diffuse solar radiation and moisture condensation).

Category 4: For operation in rooms with artificially controlled climatic conditions, for example, in enclosed heated or cooled and ventilated industrial rooms, in rooms with conditioned or partially conditioned air, and other well-ventilated underground rooms (no exposure to direct sunlight, precipitation, wind, sand, or dust from outside air; no or significantly reduced exposure to diffuse sunlight and moisture condensation).

Category 5: For operation in rooms with increased humidity (e.g., in unheated and unventilated underground rooms, including mines, basements, soil environments, ship and marine compartments, and other rooms where long-term water presence or frequent moisture condensation on walls and ceilings is possible, such as in some cargo holds, or workshops of textile or hydrometallurgical production, etc.).