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

Linde / Bitzer | Three-Compressor Industrial Refrigeration Pack

Technical Frame Specifications:
Set Manufacturer: Linde Aktiengesellschaft
Model / Type: VHM 316-4521
Serial Number: 10309
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Year of Manufacture: 1993
Refrigerant: R22
Permissible Working Pressure: 25 / 13 bar
Frame Overall Dimensions: 2930 × 830 × 1870 mm

Compressor Specifications (3x Bitzer Kühlmaschinenbau GmbH):
Power Supply: 380–420 V (50 Hz) / 440–480 V (60 Hz) – 3 phase
Maximum Operating Current: 24 A (per compressor)
Displacement per unit: 42.3 m³/h (at 50 Hz) / 51.0 m³/h (at 60 Hz)
Total displacement of the unit: 126.9 m³/h (at 50 Hz) / 153.0 m³/h (at 60 Hz)
Protection class: IP 54

Compressor List in the Set:
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 German group Linde, based on three two-stage, semi-hermetic Bitzer piston compressors from the S4G series. Such systems are designed for supplying low-temperature refrigeration installations – cold stores, freezing tunnels, and advanced cooling systems in food processing plants (meat, fish, bakery industries).

The configuration based on three identical units allows for highly flexible, three-step cooling capacity control (increments of 33%). The system automatically activates the necessary number of compressors depending on the actual thermal load, optimizing power consumption and extending component lifespan. The entire unit is assembled on a compact base frame for easy installation.

Key features:
- Reliable Two-Stage Bitzer Compressors: The two-stage compressor series is specially designed for deep-freezing applications. It ensures stable operation at very low evaporation temperatures, offering a high energy efficiency ratio.

- Linde Frame Safety and Automation: The industrial-grade frame integrates a shared suction and discharge manifold, advanced oil equalization and separation system, and all necessary control and monitoring devices (protective pressure switches), providing effective system protection against failures.

- Industrial Protection Grade (IP 54): Hermetically sealed electrical enclosures and compressor construction protect the unit from moisture and dust, ensuring safe operation in demanding machine room environments.

- Wide Application Versatility: The package is factory-configured for R22. Due to the ‘Y’ compressor variant (charged with ester oil), the unit can be reliably adapted for use with modern, eco-friendly HFC refrigerants (e.g., R448A / R449A / R404A / R507) after standard seal checks and controller adjustments.

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