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

Linde / Bitzer | Three-Compressor Industrial Refrigeration Unit

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

Specifications of Installed Compressors (3 × Bitzer Kühlmaschinenbau GmbH):
Power supply: 380–420 V (50 Hz) / 440–480 V (60 Hz) – 3 phase
Maximum running current: 24 A (per compressor)
Individual compressor displacement: 42.3 m³/h (at 50 Hz) / 51.0 m³/h (at 60 Hz)
Total displacement of set: 126.9 m³/h (at 50 Hz) / 153.0 m³/h (at 60 Hz)
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Protection rating: IP 54

List of Compressors in 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 multi-compressor central pack (so-called compressor pack) manufactured by the German concern Linde, based on three two-stage, semi-hermetic Bitzer S4G reciprocating compressors. Systems of this type are dedicated for low-temperature applications such as cold stores, blast freezers, and advanced refrigeration systems in food processing plants (meat, fish, bakery).

The construction, based on three twin units, allows for highly flexible, three-stage capacity control (stepped at 33% increments). The system automatically engages the required number of compressors according to current thermal load, optimizing energy consumption and extending component service life. The unit is assembled on a compact support frame for ease of installation.

Key Features:
- Reliable Bitzer two-stage compressors: This series is specially designed for deep-freezing, offering stable operation at very low evaporation temperatures with a high energy efficiency ratio.

- Linde frame safety and automation: The industrial-grade frame integrates a common suction and discharge manifold, state-of-the-art oil equalizing and separation system, and all essential control and measurement instrumentation (protective pressure switches), ensuring effective protection of the system against failures.

- Industrial protection rating (IP 54): Hermetically sealed electrical boxes and compressor construction protect the system against moisture and dust, allowing safe operation in harsh plant environments.

- Universal application: The unit is factory-adapted for use with R22 refrigerant. Due to the presence of compressors with the "Y" designation (pre-filled with ester oil), the system can be converted for use with modern, eco-friendly HFC replacements (such as R448A / R449A / R404A / R507) following standard seal and control system checks.

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