Water Cooled Screw Chiller RCUF420WZY

In 1972 we manufactured the first semi-hermetic twin-screw compressor in refrigeration areas. Until now we have delivered more than 200000 Hitachi twin-screw compressors to countries around the world. WZ Series adopt the latest Hitachi G-type compressors, which provides greater service to clients.

MODEL CODE

UNIT STRUCTURE

HIGH EFFICIENCY AND ECO-FRIENDLY

1. Adopt R134a environmental refrigerant without any destruction to ozone layer.

2. High efficiency units reduce electric energy consumption so as to lower the CO² discharge and greenhouse effect.

3. The whole series comply with RoHS directive.

TECH INNOVATION AND CUTTING-EDGE DESIGN

1. Adopt the latest R134a high efficiency twin-screw compressor with great capability and higher stability.

2. Equip refrigerant distributors for both inlet and outlet of evaporator improving refrigerant distributions and heat exchanger efficiency. The sub cooler is installed in the condenser, which could increase condensate depression and cycle efficiency.

3. Flooded units equip with efficient oil + scavenge pump + oil level optoelectronic switch, which is simple, reliable and without operating risk of that the compressor is lack of oil.

Flooded units equip with Application of Differential Pressure Flow Switches with effective anti-freezing capability.

OPERATION RANGE

INDEPENDENTLY DEVELOPED HITACHI R134A REFRIGERANT G-TYPE SEMI-HERMETIC TWIN-SCREW COMPRESSOR

1. Independently developed new rotors decrease internal leakage of refrigerant during the compression process as possible.

8. Pressure differential oil supply (no oil pump), with the least components, ensuring operating reliability, easy to maintain.

9. Internal exhaust non-return valve, effectively preventing reversion of rotors caused by compressed air back surging when stopping.

10. Internal Suction Filter, filtering large grained impurity, protecting screw surface from damages.

Compressor equipped with oil heater, oil sight glass, oil, repair hole and exhaust valve, convenient for maintaining

CYCLONE OIL SEPARATOR

The adoption of centrifugal oil separator is one of the major features of the Hitachi unit. Compared with the traditional filter type oil separator, there is no resistance produced by the oil filter net, and the energy consumption of the compressor is reduced.The oil separation efficiency is greatly improved, the oil entering the heat exchanger is greatly reduced, the COP of the unit is greatly improved, and the lubrication of the compressor is effectively ensured.

100-125RT EVAPORATOR

1. Dry Type evaporator, with low quantity of refrigerant sealed, has a good performance of oil return, dispensing with external oil pump or oil return filter. It has no easy damaged parts and has low costs of maintenance.

4. Multi-condensing units circulate independently, which makes good performance on

155-520RT EVAPORATOR

3. The refrigerant distributor in the evaporator implement the most reasonable distribution of the refrigerant.

REFRIGERANT CIRCUIT

Each compressor can operate independently, with good standby application, including exhaust check valve, safety valve,pipe ball valve, filter, service valve, pressure switch, pressure sensor, thermistor and etc

ADVANCED MICROCOMPUTER CONTROL SYSTEM

Clear User-friendly LCD touch Console

1. 7-inch LCD touch console, visual, simple, intuitive.

2. The display makes it easy to view the current operating status and simplify the setting procedure.Various parameters can be confirmed at a glance. Regardless of operating status, the console allows you to set a variety of operation modes.

3. A warning log function makes it possible to recall the latest 10 recent warning events.

4. The user interface is provided in both English and Chinese, suitable for domestic and international market demand.

CENTRALIZED-CONTROL SYSTEM SATISFYING INTELLECTUAL USAGE NEEDS (WATER COOLED)

MODBUS-RTU IS ALTERNATIVE, WHICH CAN CONNECT WITH THE BUILD MANAGEMENT SYSTEM.

SAFETY VALVE

If the pressure of condenser is too high, and all the other protectors are out of work, the safety valve will start to protect the units from being damaged

OVER-HIGH EXHAUST TEMPERATURE PROTECTION

If the temperature of the exhausting is too high, the liquid-side refrigerant will start to protect the compressor

COMPRESSOR MOTOR TEMPERATURE PROTECTION

The thermostat is installed into compressor motor and could shut the motor down when its temperature is higher than normal.

AVOIDING FREQUENTLY STARTING AND STOPPING OF COMPRESSORS

The thermostat delays the compressor starting time,avoiding starting frequently so as to protect the compressor.

HIGH - PRESSURE PROTECTION& LOW - PRESSURE PROTECTION ANTI-FREEZING PROTECTION

The protector turns on to make the compressor stop when the discharge pressure exceeds the set point or suction pressure is lower than set point.

REVERSING PROTECTING DEVICE

The device inducts the phases of power supply, which protects compressors from reversing operation caused by wrong phase of the power supply.

THREE-SECTION OVER-CURRENT PROTECTION

When the current of the compressor is higher than its set value, the overcurrent relay will turn off the circuit and the compressor will stop the service.

DIFFERENTIAL WATER PRESSURE SWITCH PROTECTION

When the chilled water flow is too low or even cutoff,the water pressure differential will start to work and the unit will stop working. It will protect the evaporator from being frozen.

OIL HEATER

Ensure the great lubricating performance. Prevent the oil foaming induced by Starting

PROTECTION FOR OPTOELECTRICAL OIL LEVEL SWITCH

Stop and alarm when the compressor operates beyond 1min with oil shortage, which avoids risks caused by oil shortage

ANTI-FREEZING PROTECTION

The anti-freezing protector turns on when the compressor temperature is lower than the set point, which avoids crystallization of refrigerating fluid in evaporator.

SPECIFICATIONS

RCUF100/125WZY DIMENSIONAL DATA

RCUF100/125WZY UNIT FOUNDATION FIGURE