VC 4-75 VZ #3.15 w/motor 4VR 71 B4 0.75 kW 1500 rpm, execution 1

Series VC 4-75 #3,15 low-pressure centrifugal fan (VR 88-72.1-5.5, VR 80-75-5) with Electric motor 4VR 71 B4 0.75 Power kW 1500 Vol./Min electric motor, manufactured from dissimilar materials for explosive atmospheres.

Intended Application:

This fan is designed for ventilation or air-conditioning systems handling gas–steam–air explosive mixtures of categories 1 and 2 of groups T1, T2, T3 according to the “Rules for Electrical Installations” (PVE), which do not cause accelerated corrosion of the flow parts of the fans. These mixtures should not exceed a temperature of 80 °C, and the content of fibrous materials, sticky substances, dust, and other solid impurities should not exceed 100 mg/m³ under moderate (U) climate (placement category 3) and tropical (T) climate (placement category 2) conditions in accordance with DSTU 15150. The ambient temperature is permitted from −40 °C to +40 °C (+40 °C when equipped with tropical-design electric motors).

Housing and Impeller Blade Material:

The housing and impeller blades of the explosion-proof fans are manufactured from material pairs (steel–brass or steel–aluminum) that are non-sparking under frictional conditions, in accordance with DSTU 22782.0-81.

Configuration and Modular Components:

The series VC 4-75 #3,15 centrifugal fan (VR 88-72.1-5.5, VR 80-75-5) consists of the following modules, which can be purchased separately:

– Fan VC 4-75 #3,15 (VR 88-72.1-5.5, VR 80-75-5) without electric motor

– Impeller wheel of fan VC 4-75 #3,15 (VR 88-72.1-5.5)

– Fan housing (casing) VC 4-75 #3,15 (VR 80-75-5)

– Electric motor Electric motor 4VR 71 B4 0.75 Power kW 1500 Vol./Min for fan VC 4-75 #3,15

General Characteristics of Series VC 4-75 #3,15 (VR 88-72.1-5.5, VR 80-75-5) Fans with Electric motor 4VR 71 B4 0.75 Power kW 1500 Vol./Min Electric Motor, Manufactured from Dissimilar Metals:

– Low pressure

– Single-sided suction

– Backward-curved blades

– Number of blades: 12

– Direction of rotation: right and left

– Fans are manufactured in accordance with TU U 28.2-24881057-003:2023

– Construction material: dissimilar metals

Application of Series VC 4-75 VZ #3.15 w/motor 4VR 71 B4 0.75 kW 1500 rpm (VR 88-72.1-5.5, VR 80-75-5) Centrifugal Fans:

These fans are used in:

– Air conditioning systems

– Ventilation systems

– Air heating systems

– Other sanitary and industrial applications

Operating Conditions:

The series VC 4-75 VZ #3.15 w/motor 4VR 71 B4 0.75 kW 1500 rpm centrifugal fans (VR 88-72.1-5.5, VR 80-75-5) operate under moderate climate conditions at ambient temperatures from −40 °C to +40 °C. The temperature of the conveyed medium should not exceed 80 °C.

Principle of Operation:

Air is drawn into the fan under the influence of centrifugal force, passing through the impeller blades at a 90° angle and directed radially into the scroll-shaped casing. In the casing, the pressurized air is guided along the spiral path and discharged through the fan outlet.

Assembly of Series VC 4-75 #3,15 Centrifugal Fans Made of Dissimilar Metals:

The VC 4-75 #3,15 (VR 88-72.1-5.5, VR 80-75-5) fan with Electric motor 4VR 71 B4 0.75 Power kW 1500 Vol./Min electric motor comprises the following main components:

– Spiral casing

– Impeller wheel

– Support frame (stand)

– Collector

– Electric motor Electric motor 4VR 71 B4 0.75 Power kW 1500 Vol./Min

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

The fan stand is welded. The base has a hole for mounting on vibration isolators or foundation. The electric motor and casing are mounted on the stand.

The conical collector for guiding air to the impeller wheel is attached to the inlet nozzle. The overlap between the collector and the front disc of the impeller wheel is adjusted by axial movement of the collector in the inlet nozzle.

Position of Radial Fan Housings for Right (PR) and Left (LIV) Rotation, Viewed from the Suction Side:

a) Right rotation

b) Left rotation

Note on Placement Categories Based on Climatic Conditions:

1st category: for outdoor operation (influence of combined climatic factors characteristic of a given macroclimate region);

2nd category: for operation under a canopy or in volumes where temperature and humidity fluctuations do not differ significantly from those outdoors and there is relatively free access to external air, e.g., tents, vehicle bodies, trailers, metal enclosures without insulation, and in the enclosure of 1st category products (absence of direct solar radiation and atmospheric precipitation);

3rd category: for operation in enclosed volumes with natural ventilation without artificially regulated climatic conditions, where temperature and humidity fluctuations and the influence of dust and sand are significantly less than outdoors, e.g., metal-insulated, stone, concrete, wooden enclosures (absence of precipitation, direct solar radiation; significant reduction in wind; reduced or absent diffusion of solar radiation and condensation);

4th category: for operation in volumes with artificially regulated climatic conditions, e.g., closed heated or cooled and ventilated production premises, for operation in conditioned or partially conditioned air environments and others, including well-ventilated underground spaces (absence of direct solar radiation, atmospheric precipitation, wind, sand and dust; absence or significant reduction of diffused solar radiation and moisture condensation);

5th category: for operation in volumes with elevated humidity (e.g., unheated and unventilated underground spaces, including mines, basements, in the ground, and in ship, vessel, and other spaces where water may persist or frequent moisture condensation on walls and ceilings, e.g., some holds, some textile and hydrometallurgical production areas, etc.).