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|Top-class Compact Design and Light Weight Design|
|Structure of Model Name|
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.
|* 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.|
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
Low loss bearing structureAdoption 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 vaneSpecial 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 100ï¼…ï½ž20ï¼… 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.|