VC 4-75 VZ #4 w/motor 4VR 71 A6 0.37 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 71 A6 0.37 Power kW 1000 Vol./Min made from dissimilar materials for explosive environments

This fan is designed 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 in the airflow section of the fans. 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 equipped with tropical-design electric motors).

The housings and blades of explosion-proof fan impellers 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 VC 4-75 #4 (VR 88-72.1-5.5)
• Casing VC 4-75 #4 (VR 80-75-5)
• Electric motor Electric motor 4VR 71 A6 0.37 Power kW 1000 Vol./Min for fan VC 4-75 #4

General information about centrifugal fans VC 4-75 #4 (VR 88-72.1-5.5, VR 80-75-5) with electric motor Electric motor 4VR 71 A6 0.37 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 71 A6 0.37 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 airflow section materials. 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) and tropical (T) climate conditions (placement categories 3 and 2 respectively) according to GOST 15150. Ambient temperature should range from -40°C to +40°C (+40°C with tropical-design motors).

Centrifugal fans VC 4-75 VZ #4 w/motor 4VR 71 A6 0.37 kW 1000 rpm (VR 88-72.1-5.5, VR 80-75-5) are used in:

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

The centrifugal fan VC 4-75 VZ #4 w/motor 4VR 71 A6 0.37 kW 1000 rpm operates in moderate climates 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 71 A6 0.37 kW 1000 rpm:

Air, by receiving energy from the impeller blades, enters the fan under centrifugal force at a 90-degree angle and moves radially to the spiral casing. Inside the spiral, the air moves along the spiral shape and 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 with electric motor Electric motor 4VR 71 A6 0.37 Power kW 1000 Vol./Min includes the following main components:

• Spiral casing
• Impeller
• Base frame
• Collector
• Electric motor Electric motor 4VR 71 A6 0.37 Power kW 1000 Vol./Min

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

The base frame is welded. The base has a hole for installation on vibration isolators or a foundation. The motor and cover are mounted on the frame.

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

Orientation of right-hand (RH) and left-hand (LH) rotation radial fan casings, 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 use (exposed to climatic factors typical of the region).

Category 2: For use under shelter or in spaces where conditions are slightly different from outdoor air, such as tents, trailers, metal structures without insulation, or in equipment enclosures of category 1 (no direct sunlight or precipitation).

Category 3: For use indoors with natural ventilation without controlled climate, where the influence of dust, sand, and humidity is significantly lower than outdoors (e.g., insulated metal, stone, concrete, or wooden buildings).

Category 4: For use in rooms with controlled climate (heated, cooled, ventilated), including partially air-conditioned or well-ventilated underground spaces (no exposure to external factors or moisture condensation).

Category 5: For use in areas with high humidity (e.g., unheated and unventilated underground spaces, mines, basements, soil, ship compartments, or production areas with water presence or moisture condensation).