Certification and Company Information

Johnson Controls - Hitachi Air Conditioning, based in Tokyo, Japan, holds ISO 9000 (since 1995) and ISO 14000 (since 1997) certifications, ensuring quality and environmental management compliance. Contact and product details are accessible via their official website.

Product Overview: Scroll Compressors for Ultra-Low Temperature Applications

The company specializes in scroll compressors tailored for ultra-low temperature uses, notably helium refrigeration compressors (model HR-E594R). They pioneered the first scroll compressor for ultra-low temperatures in 1985 and introduced inverter-driven models in 2005.

Key Features and Advantages

• High Pressure Chamber Structure: Eliminates tip-seal and thrust bearing, reducing mechanical losses and enhancing operational stability and lifespan.
• Oil Injection Cooling System: Keeps discharge gas and motor temperatures low, improving reliability and efficiency.
• Corona Electric Discharge Resistance: Design and exclusive motor improve resistance to corona discharge under helium gas and inverter control, extending motor life and compressor reliability.
• Energy Saving: Inverter control avoids ON-OFF cycling during idling and low load, enabling energy savings, wide operating range, and compressor downsizing.

Historical Development Timeline

• 1966: Began supplying reciprocating compressors for railway air conditioners.
• 1983: Developed the world’s first scroll compressor for packaged air conditioners.
• 1985: Created the first scroll compressor for ultra-low temperature applications.
• 1999-2011: Expanded production of various horsepower classes (2.5HP to 10HP).
• 2005: Started manufacturing inverter-driven units.

Technical Specifications

The document details compressor models with motor types (constant speed and inverter), horsepower classes (2.5HP to 10HP), power supply phases and voltages, displacement volumes, gas flow rates, pressure ratios, and net weights.

• Gas flow rates range from ~33 to 190 Nm³/h depending on model and frequency.
• Pressure ratios typically range from 1.8 to 7.5.
• Net weights vary between approximately 28 kg (61.7 lbs) and 70 kg (154 lbs).
• Operating conditions include suction gas pressures of 0.58 to 0.74 MPaG and discharge pressures up to 2.07 MPaG.
• Specified oil injection flow rates and temperatures ensure effective cooling and lubrication.

Dimensional and Connection Data

Comprehensive mechanical drawings specify refrigerant suction, discharge, oil injection, and oil outlet connection sizes (brazing and flare), terminal box locations, oil sight glass, and nameplate positions. Dimensions are provided in millimeters and inches to facilitate installation.

Compressor Models and Dimensions

• Models: GA120SHA and GA150SHA
• Connection type: 1/2" Brazing (R25)
• Connection diameter: 210 mm (8.3 in)
• Material references: S403DH, S503DH, S603DH suitable for ultra-low temperature environments
• Dimensions:
  • GA120SHA: L1 = 26 mm (1.0 in), L2 = 628 mm (24.7 in)
  • GA150SHA: L1 = 30 mm (1.2 in), L2 = 632 mm (24.9 in)

Operating Range Specifications

• Discharge Pressure (Pd): 1.08 to 2.45 MPaG (157 to 355 psig)
• Suction Pressure (Ps): 0.10 to 1.00 MPaG (14.5 to 145 psig)
• Compression Ratio (ε): 1.8 to 7.5 (dimensionless)

Operating Range Graphs

Graphs illustrate permissible operating envelopes showing relationships between suction and discharge pressures for different models, ensuring reliable performance under ultra-low temperature conditions.

Notes and Definitions

• Compression Ratio (ε) is defined as the ratio of absolute discharge pressure to absolute suction pressure.
• Pressure values are provided in both MPaG and psig for clarity.

Summary of Best Practices and Limitations

• Strict adherence to specified pressure ranges is essential for maintaining compressor efficiency and longevity.
• Proper brazing connections and compliance with dimensional specifications ensure mechanical integrity.
• Material choices (S403DH, S503DH, S603DH) confirm suitability for ultra-low temperature applications.

Critical Information Summary

• Design Innovations: High pressure chamber and oil injection cooling enhance reliability and efficiency in helium gas environments.
• Energy Efficiency: Inverter control technology enables broad operating ranges, energy savings, and unit downsizing.
• Application Scope: Ideal for ultra-low temperature refrigeration, especially helium refrigeration systems.
• Installation Support: Detailed mechanical and connection dimensions facilitate precise installation.
• Certifications: ISO 9000 and ISO 14000 series certifications guarantee quality and environmental standards compliance.

This document serves as a comprehensive technical reference for engineers and professionals involved in specifying, installing, and maintaining Johnson Controls - Hitachi ultra-low temperature scroll compressors.