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Linde, Bitzer VHM 316-4521, S4G-12.2-40P, S4G-12.2 Y

Linde / Bitzer | Triple-Compressor Industrial Chiller

Technical specifications of the frame:
Unit manufacturer: Linde Aktiengesellschaft
Model / Type: VHM 316-4521
Serial number: 10309
Year of manufacture: 1993
Refrigerant: R22
Allowable working pressure: 25 / 13 bar
Overall dimensions of the frame: 2930 × 830 × 1870 mm

Specifications of the installed compressors (3x Bitzer Kühlmaschinenbau GmbH):
Power supply: 380–420 V (50 Hz) / 440–480 V (60 Hz) – 3 phases
Maximum operating current: 24 A (per compressor)
Volumetric capacity per unit: 42.3 m³/h (for 50 Hz) / 51.0 m³/h (for 60 Hz)
Total volumetric capacity of the unit: 126.9 m³/h (for 50 Hz) / 153.0 m³/h (for 60 Hz)
Protection class: IP 54

List of compressors in the section:
Compressor no. 1:
Type S4G-12.2 Y
Serial number: 15851279

Compressor no. 2:
Type S4G-12.2-40P
Serial number: 1676905728

Compressor no. 3:
Type S4G-12.2-40P
Serial number: 1678210359

Industrial central multi-compressor unit (so-called "compressor pack") built by the German Linde Group based on three two-stage, semi-hermetic Bitzer reciprocating compressors from the S4G series. This type of system is designed to power low-temperature installations – freezers, freezing tunnels, and advanced refrigeration systems in food processing plants (meat, fish, bakery).

The design based on three identical units allows for very flexible, three-stage cooling capacity management (in steps of 33%). The system automatically activates the appropriate number of compressors depending on the actual thermal load, which optimizes energy consumption and extends the service life of the components. The entire unit is mounted on a compact support frame, which facilitates installation.

Key features:
- Reliable Bitzer two-stage compressors: The two-stage compressor series is specifically designed for deep freezing. It ensures stable operation at very low evaporation temperatures and is characterized by a high energy efficiency ratio.

- Safety and automation of the Linde frame: The industrial design of the frame integrates a common suction and discharge manifold, an advanced oil equalization and separation system, and the necessary control and measuring equipment (protective pressure switches), which effectively protects the system from failures.

- Industrial protection class (IP 54): Hermetic electrical boxes and the compressor design protect the system from moisture and dust, allowing for safe operation in harsh machine room conditions.

- Application versatility: The unit is factory-designed to operate with R22 refrigerant. Due to the presence of compressors with the "Y" designation (filled with ester oil), the system can be successfully adapted to work with modern, environmentally friendly alternatives from the HFC group (e.g., R448A / R449A / R404A / R507) after a standard verification of seals and automation settings.
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