skip to main content

Riley Surface World uses cookies to give you the best experience on our website. If you continue we assume that you consent to receive cookies on our website. Read More

Machines & equipment for sale

Hitachi RCUE 60AG2 Samurai 156 kW Process Chiller

Stock No
Year of Manufacture
Ave. cooling capacity
Ave. Water Flow Rate
Min Water Flow m3 /h 20.7 Max 55.8
Other Info
Only 1111 Run Hours
Our Central Warehouse, Aldridge, UK
Weight (kgs)
External Dimensions (WxDxH mm)
1980 X 2250 X 2430


Hitachi RCUE 60AG2 Samurai 178 kW Process Chiller

HITACHI is a world leader in technology and with continual research and product development

THE Samurai range incorporates the latest developments of HITACHI´S screw compressor technology for the new millennium with highly reliable HITACHI two-pole compressor motor, built-in oil separator (cyclone oil separator) ™oil sight glass, oil heater, high precision twin screw rotors and suction filter.


Precise Control 

Temperature Continuous capacity control is based on precise control of the water outlet temperature, depending on the thermal requirements of the load. This is reflected in lower operation costs as the unit will only provide the energy needed for the load.

To control the water temperature the SAMURAI uses two essential components as follows:

  1.  A sliding valve in the screw compressor to change the refrigerant circuit variables, adapting them to the requested load.
  2. A sophisticated electronic system based on control bands in which the aim is to maintain a constant outlet temperature.

There are 4 bands which can be configured:


Given a load and having selected a water outlet temperature, the electronic system compares the value measured by thermistors with the desired value. Depending on the measured value, and at one-minute intervals, a control signal is generated that varies the position of the sliding valve either to increase or to decrease the capacity as required.

The control signal is sent to the solenoid valves located in the compressor and those valves command the sliding valve’s movements. The signal has a variable length therefore the slider repositioning will be variable according to the control band.

Features and benefits

When the band LOAD UP 1 is selected, the signal will last for 12 seconds. When the band LOAD UP 2 or LOAD DOWN is selected, the signal will last 2 seconds. When the NEUTRAL BAND is selected, the slider will stay where it is, as will the capacity.

The great advantage of this system is that it has control bands with different behaviours so the unit is better able to adapt to load requirements. When a quick response is needed (when the measured temperature is very different from the desired temperature), the system can be programmed to provide quick control.

When a precise response is required (when the measured temperature is close to the desired temperature), it can be programmed to give a more precise response. Compared to PID control systems, the advantage is that a faster response time can be achieved.

The response in LOAD UP 1 is significantly quicker than a PID system, hence so is achieving the desired results. Also the system’s great flexibility permits the installer to adapt the response times or the system’s precision to that specific installation. This is done by means of a simple programming of the micro switches in the micro-processor.

Low Noise 

Sound levels and vibration are key factors during the operation of a chiller. In many applications it may be necessary to limit the sound level to permitted values, depending on local regulations.

The SAMURAI chillers operate at low sound and vibration levels due to the technical development of the HITACHI semi-hermetic screw compressors, precise machining and meticulous assembly during the production process.

The compressors are mounted on rubber pads that protect the structure of the chiller from possible compressor vibrations, which is why the overall result is absolutely balanced.

Hitachi uses technology to achieve the lowest sound. The new two bladed propellers, rather than four bladed, achieves a reduction of noise level, increases air flow volume, and at the same time provides an important reduction of motor power input.

The compressors are installed in an enclosure and covered with acoustic insulating material to further reduce the sound level as far as possible. The fans are also specifically designed to reduce noise while permitting sufficient circulation of air for the correct operation of the unit.

The AG2 unit is fitted with a DC Inverter fan in order to adapt the air flow more efficiently and therefore control the discharge pressure and the acoustic impact. These features of the SAMURAI chiller can help to reduce the overall installation costs as it can eliminate the need for any acoustic screens or external sound attenuation packages.

Ideal Starting System

The electrical starting system in the SAMURAI range prevents you from having to install oversized electrical wiring due to the peak currents that are usually caused by conventional chillers. This is due mainly to two reasons. The compressor’s electrical motor has a STAR-DELTA starting system which is installed as standard which allows a significant reduction in the compressor’s starting power.

Minimum Amount of Water in the Installation

To prevent an excessive number of compressor starts and stops, which results in reducing their useful life, the installation must have a minimum amount of water to provide the system with the required thermal inertia.

This minimum required volume depends on how good the control system is and what is the minimum capacity of the unit.

SAMURAI chillers require a small installed volume since the capacity control range is very wide (15%-100%). Furthermore, by utilising the optional function (volt free contact) this external contact can be installed in the Electrical Box in order to control the compressor/s of the unit. This minimum possible capacity makes it possible to reduce the minimum installation volume when required.

Minimum Amount of Refrigerant

SAMURAI chillers use a stainless steel plate heat exchanger as the evaporator. This exchanger is far more compact than the traditional shell & tube type heat exchangers. It takes up far less space even though it exchanges the same capacity.

Thanks to this technological development, SAMURAI requires the lowest charge of refrigerant on the market. This leads to lower operating costs once the system is in operation, as the amount of refrigerant that may need to be replaced during maintenance operations will be minimal.

New Electronic Expansion Valve

These units are equipped with an electronic expansion valve to provide sophisticated control under any temperature conditions. The electronic expansion valve provides reduced electrical power consumption compared to the classical system.



  • Cooling Capacity kW 156
  • Total Power Input kW 52.3 
  • COP – 2.98
  • Outer Dimension
  • Height mm 2,430 
  • Width mm 1,980 
  • Depth mm 2,250 
  • Cabinet Colour Natural Grey
  • Shipping Weight kg 1,560 
  • Compressor Type – Semi-Hermetic Screw Type
  • Models – 50ASC-Z 
  • Quantity – 1 
  • Oil Heater W 150 
  • Capacity Control, Continuous Capacity
  • Working Range % 15 ~100 
  • Water Cooler Type – Brazing Plate Type Brazing Plate Type
  • Condenser Type – Multi-Pass Cross Finned Tube 
  • Fan Motor kW 0.38
  • Quantity – 4 
  • Refrigerant Type – R407C
  • Charge kg 41
  • Flow Control Electrical Expansion Valve 
  • Number of Circuits – 1
  • Oil Type – Japan Energy Freol UX300 (Ester) 
  • Evaporator Type Stainless steel plate heat exchanger brazed with copper 
  • Min Water Flow m3 /h 20.7 
  • Max Water Flow m3 /h 55.8
  • Max. Pressure MPa 1.0 
  • Connections inches 3” Victaulic (1xInlet / 1xOutlet) 
  • Control System – Micro-Processor Control
  • Chilled Water outlet Temperature ˚C 5 ~ 15 (-10 ˚C Option) 
  • Condenser Air Inlet Temperature ˚C -15 ~ 46
  • Sound Power Level dB 84
  • Sound Pressure Level dB (A) 67 
  • Power Supply – 3~, N / 380V-415V / 50Hz 

General Data Notes

  1. Cooling capacity, input power, flow rate and water pressure drop calculated according to EN12055 for standard conditions. (Ambient = 35°C, chilled outlet water = 7°C and chilled inlet water = 12°C, Condenser water inlet 30°C and condenser water outlet 35°C, Refrigerant saturated vapour temperature =45°C)
  2. Heating capacity according to EN12055 for standard conditions (Ambient = 8°C DB, outlet water = 45°C, inlet water = 40°C
  3. Sound power values according to EUROVENT test. Sound pressure measured to 1.5m height and 1m from control panel

pdf icon Print / Download Hitachi RCUE 60AG2 Samurai 156 kW Process Chiller Datasheet

Additional files

Photographs taken prior refurbishment. Our refurbishment service is not available on all machines.