Skip to main content

Hitachi in India

Standard Efficiency Type

Hitachi GSG Series Centrifugal Chillers
Top-class Compact Design and Light Weight Design
  • The compact design greatly improves flexibility in installation.
  • Realizing space saving of machine room.
  • Easy carry-in to machine room.
  • Suitable for replacement of long-operating chillers.
  • Significant reduction of refrigerant volume.
Structure of Model Name
Surge Protection

Adopting strict criteria specified in JIS for stable operation under high cooling water temperature. 3D 2-stage impeller enables stable operation even at low cooling load or high cooling water inlet temp. which prevents occurrence of surge.

  • Compressor characteristic comparison
* This figure shows general characteristics and does not provide any guarantees as to the performance.
New Type Economizer
Improvement of vapor-liquid separation performance and significant downsizing are realized by the use of Newly-developed economizer. (cyclonic system)
Compatible with BMS
Chiller control panel is equipped with RS485 communication port and compatible with Building Management System through MODBUS RTU protocol.
Easy Operation with Touch Panel Type Control Panel
10.4 inch color touch panel screen
Monitor various operating data
Indicate trend graph during operation
Trend data for max. 40 hours. (Updated every 1 hour)
Indicate and store operation history for the past 12 hours (Updated every hour)
Indicate and store failure and alarm history (latest 6 times each)
Show Handling Guide in case of failure
Automatic restart function after instantaneous power failure (Option)
Multilingual Languages Indication (Japanese, English, Chinese [Simplified, Traditional], Portuguese)
Download 3-month operation date to USB memory
Ozone layer Protection
Chlorofluorocarbons (CFCs) diffusing in the stratosphere are exposed to ultraviolet rays to be decomposed, separationg chlorine atoms. It is said that separated chlorine atoms combine with oxygen atoms in ozone to destroy the ozone. Because HFC134a has no chlorine atoms, it does not destroy the ozone in the atmosphere.
By employing a three-dimensional blade impeller (2 stages), economizer cycle and high-performance heat exchanger tubes, Hitachi succeeded in greatly increasing efficiency.
2-stage Compression Cycle
To improve compressor efficiency, refrigerant economizer is added with 2-stage compressor that is equipped with 2 impellers, as shown in the right drawing. In this case, the refrigerant goes through two expansion devices.
When the refrigerant goes through the first devices, some of the refrigerant flashes, or become a gas. The flashed refrigerant is introduced to the compressor between the two stages.
In the one-stage compressor cycle without the economizer, all refrigerant flows in the cycle.
Comparatively, In the 2-stage compressor cycle the part of the refrigerant is bypass from the economizer to the 2-stage impeller.
High-Efficiency Refrigerating Cycle

Three dimensional high efficiency 2-stage impeller

  • Blade-like and 3-dimensional structure impeller with low flow loss achieves high efficiency in wider range.
  • Impeller material is a high hardness alloyed metal.
  • Vaccum precision casting realizes an ideal streamline shape.


Low loss bearing structure

Adoption of 2 stage compressor cycle technology which decrease compressor rotation speed enables the bearing to lower mechanical loss.
This also achieves longer life-span of centifugal chiller.


Diffuser with vane

Special designed diffuser with vane enables to improve specified efficiency and also to keep the stable operation in wider range. The capacity is well controlled between 100%~20% without any surging.


Reduction of High-frequency Wave Sound Enables Low Noise
Design optimization of fluid in compressor enables to reduce noise in fluid working. Rotation speed reduction by adopting 2 stage compressor also realizes low noise in high-wave in particular and stabilizes operation.
Key-free shaft coupling is used
A friction force transmission system that is free from stress concentration further improves strength against low-cycle fatique.
High Reliability Design - High reliable lubricating oil supplying system -
Direct refrigerant cooling of lubrication oil in oil cooler without cooling water piping increase reliability.
Wider Operating Range
Stable operation continues eve when cooling water temperature rises in hot summer and condenser pressure rises due to proceeding tube fouling.


Our Clients

  • Retail Chain
  • Telecommunications
  • Food Joints
  • Residential
  • Banks
  • Automobile Showrooms
  • Corporate Offices
  • Builders
  • Educational Institutes

*All company logos are trademarks™ or registered® trademarks of their respective holders