High Performance A-Type Screw Compressor
Built-in Cyclone Oil Separator
- Low oil carrying-out is realized and reduction of heat transfer efficiency is minimized.
No outside pump is required due to the reliable differential-pressure oil-feeding system.
- This oil-feeding system, which does not use any electrical mechanism, prevents the compressor from being damaged and maintains long-term stable operation.
High Technology by Internal Manufacture
- Because all manufacturing processes, from rotor manufacturing to unit assembly, are done internally, exceptional reliability is achieved.
Low Vibration, Low Noise
- Without the conventional demister chamber system, no noise is produced during oil separation of discharge gas. A vibration-proof base is not required for the chiller body thanks to the firmly-secured, low-vibration screw compressor.
Continuous Capacity Control
The temperature of the chilled water outlet can be kept at the set temperature ±1°C by continuous capacity control, so it is suitable for industrial use.
Simple Structure and Small Number of Parts
Whereas the number of main parts for the casing, compression mechanism and capacity control mechanism of a reciprocating compressor is 268, that of a screw compressor is only 27, just one tenth of the number. A structure with so few parts offers high reliability and easy maintenance.
High Technology by Internal Manufacture
Because all manufacturing processes, from rotor manufacturing to unit assembly, are done internally, exceptional reliability is achieved.
Modular System
Hitachi chiller units feature a modularization cycle structure, so each module can be packed and transported individually, for more convenient local installation and displacement. Furthermore, the refrigerant system of each module can be operated independently, which makes maintenance easier.
The Volume, installation space and weight are all reduced, making installation easy.
The Hitachi chiller is equipped with several safety devices as standard. Those safety devices protect the unit from abnormal operation for higher reliability and longer lifespan of the chiller.
List of Safety Devices
- Three-Phase Over-current Relay
- High-Pressure Switch
- Low-Pressure Switch
- Oil Heater
- Internal Thermostat for Comoressor Motor
- Fusible Plug
- Freeze Protection Thermostat
- Reverse Phase Protection Relay
- Discharge Gas Thermostat
- Operation Hour-Meter and Safety Valve
