VC 4-75 VZ #4 w/motor 4VR 80 B4 1.5 kW 1500 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 80 B4 1.5 Power kW 1500 Vol./Min made of dissimilar materials for explosive environments

This fan is intended for ventilation or air conditioning systems operating with explosive gas-vapor-air mixtures of the 1st and 2nd categories of groups T1, T2, T3 according to the "Rules for Electrical Installations" (PUE), which do not cause accelerated corrosion of materials in the flow part of the fan. 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 (placement category 3) and tropical (T) climate (placement category 2), in accordance with DSTU 15150. Ambient temperature is allowed in the range from -40 °C to +40 °C (+40 °C when using electric motors of tropical design).

The casing and impeller blades of explosion-proof fans are made from material pairs (steel-brass or steel-aluminum) that are safe from ignition by friction sparks according to DSTU 22782.0-81.

The centrifugal fan VC 4-75 #4 (VR 88-72.1-5.5, VR 80-75-5) consists of the following units that can be purchased 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 (shell) of the fan VC 4-75 #4 (VR 80-75-5)
• Electric motor Electric motor 4VR 80 B4 1.5 Power kW 1500 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 80 B4 1.5 Power kW 1500 Vol./Min made from dissimilar metals:

• Low pressure
• Single-sided suction
• Backward-curved blades
• Number of blades: 12
• Rotation direction: right and left
• Manufactured according to TU U 28.2-24881057-003:2023
• Material: dissimilar metals

Purpose of centrifugal fans VC 4-75 VZ #4 w/motor 4VR 80 B4 1.5 kW 1500 rpm (VR 88-72.1-5.5, VR 80-75-5):

This fan is intended for ventilation or air conditioning systems operating with explosive gas-vapor-air mixtures of the 1st and 2nd categories of groups T1, T2, T3 according to the "Rules for Electrical Installations" (PUE), which do not cause accelerated corrosion of materials in the flow part of the fan. 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 (placement category 3) and tropical (T) climate (placement category 2), in accordance with GOST 15150. Ambient temperature is allowed in the range 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 80 B4 1.5 kW 1500 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 80 B4 1.5 kW 1500 rpm (VR 88-72.1-5.5, VR 80-75-5) operates in moderate climate conditions with ambient temperatures ranging 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 80 B4 1.5 kW 1500 rpm (VR 88-72.1-5.5, VR 80-75-5):

Air, after receiving energy from the impeller blades, enters the fan under the influence of centrifugal force at a 90-degree angle and moves radially toward the spiral casing. In the spiral-shaped casing, the air is directed under pressure through the fan exhaust.

Completeness of 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 electric motor Electric motor 4VR 80 B4 1.5 Power kW 1500 Vol./Min consists of the following main components:

• Spiral casing
• Impeller
• Frame
• Collector
• Electric motor Electric motor 4VR 80 B4 1.5 Power kW 1500 Vol./Min

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

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

The conical collector for supplying air to the impeller is mounted on the inlet pipe. The overlap between the collector and the front disc of the impeller is adjusted by axial displacement of the collector in the inlet pipe.

Fan housing positions (view from the suction side):

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

Note on placement categories depending on climate conditions:

Category 1: For outdoor use (exposed to the full range of climatic factors specific to the macroclimatic region).

Category 2: For use under a canopy or in enclosures where temperature and humidity variations are not significantly different from outdoor conditions and with relatively free access to outside air, such as tents, containers, metal enclosures without insulation, or inside enclosures of category 1 devices (no direct exposure to sunlight or precipitation).

Category 3: For use in enclosed spaces with natural ventilation and no artificial climate control, where temperature and humidity fluctuations and exposure to dust and sand are significantly lower than outdoors, such as insulated metal, stone, concrete, or wooden buildings (no direct exposure to precipitation or sunlight, significantly reduced wind, reduced or no diffused sunlight and moisture condensation).

Category 4: For use in spaces with controlled climate conditions, such as heated, cooled, and ventilated industrial premises, or in ventilated underground areas (no exposure to direct sunlight, precipitation, wind, or outdoor dust and sand; significantly reduced or no diffused sunlight and moisture condensation).

Category 5: For use in spaces with high humidity (e.g., unheated and unventilated underground areas, including mines, basements, in soil, and in ship or other compartments where water presence or condensation frequently occurs, such as some ship holds or workshops in textile or hydrometallurgical industries).