VC 4-75 VZ #5 w/motor 4VR 80 A6 0.75 kW 1000 rpm, execution 1

Series VC 4-75 #5 low-pressure centrifugal fan (VR 88-72.1-5.5, VR 80-75-5) with Electric motor 4VR 80 A6 0.75 Power kW 1000 Vol./Min electric motor, manufactured from dissimilar materials for explosive atmospheres.

Intended Application:

This fan is intended for ventilation or air-conditioning systems handling gas–steam–air explosive mixtures of the 1st and 2nd categories of groups T1, T2, T3 according to the classification of the “Rules for Electrical Installations” (PVE), which do not cause accelerated corrosion of the materials in the flow parts 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 (placement category 3) and tropical (T) climate (placement category 2) conditions in accordance with DSTU 15150. The ambient temperature range is 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 form a non-sparking combination under frictional conditions, in accordance with DSTU 22782.0-81.

Configuration and Modular Components:

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

• Fan VC 4-75 #5 (VR 88-72.1-5.5, VR 80-75-5) without electric motor
• Impeller wheel of fan VC 4-75 #5 (VR 88-72.1-5.5)
• Fan housing (casing) VC 4-75 #5 (VR 80-75-5)
• Electric motor Electric motor 4VR 80 A6 0.75 Power kW 1000 Vol./Min for fan VC 4-75 #5

General Characteristics of Series VC 4-75 #5 Fans with Electric motor 4VR 80 A6 0.75 Power kW 1000 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
• Manufactured in accordance with TU U 28.2-24881057-003:2023
• Construction material: dissimilar metals

Applications of Series VC 4-75 VZ #5 w/motor 4VR 80 A6 0.75 kW 1000 rpm Fans (VR 88-72.1-5.5, VR 80-75-5):

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

Operating Conditions:

The series VC 4-75 VZ #5 w/motor 4VR 80 A6 0.75 kW 1000 rpm centrifugal fans operate under moderate climate conditions at ambient temperatures from −40 °C to +40 °C. The temperature of the conveyed medium must not exceed 80 °C.

Principle of Operation:

Air, by means of energy imparted by the impeller blades, enters the fan under the influence of centrifugal force at a 90° angle, is directed radially into the scroll-type casing, and within the casing follows a spiral path under pressure before being discharged through the fan outlet.

Delivery Set of Series VC 4-75 #5 Fans Made of Dissimilar Metals:

The VC 4-75 #5 centrifugal fan (VR 88-72.1-5.5, VR 80-75-5) with electric motor Electric motor 4VR 80 A6 0.75 Power kW 1000 Vol./Min comprises the following main units:

• Spiral casing
• Impeller wheel (front and rear discs, 12 sheet blades, and hub)
• Support frame
• Collector
• Electric motor Electric motor 4VR 80 A6 0.75 Power kW 1000 Vol./Min

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

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

The conical collector for guiding air to the impeller wheel is secured to the inlet nozzle. The overlap between the collector and the front disc of the impeller wheel is regulated by axial movement of the collector within the inlet nozzle.

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

• Right rotation
• Left rotation

Note on Placement Categories Based on Climatic Conditions:

1st category: for outdoor operation (influence of combined climatic factors characteristic of the 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 enclosures 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., insulated metal, stone, concrete, wooden enclosures (absence of precipitation, direct solar radiation; significant reduction of wind; reduced or absent diffused solar radiation and condensation);

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

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