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Hitachi RCUE200AG1 - User Manual

Hitachi RCUE200AG1
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AIR COOLED
WATER CHILLERS
-SCREW TYPE-
Installation, Operation and Maintenance Instructions.
Design Information
Technical Catalog
RCUE40AG1-400AG1 (R407C)
Cooling Capacity 108 kW - 1068 kW

Table of Contents

Questions and Answers

  • F
    fwatsonAug 19, 2025
    How to fix a Hitachi Chiller when the condenser fan does not operate?
    • M
      Maria WongAug 19, 2025
      If the condenser fan on your Hitachi Chiller isn't working, there are several potential causes: * The current to the unit may be shut off. Try resetting the power supply line. * The fuse for the operation circuit might be blown or have faulty contact. Check for shorted components or loose connections, and tighten or replace as needed. * The contactor holding coil could be burned out or have faulty contact. Identify the cause and repair or replace the coil. * The overcurrent relay may be tripped. Remove the cause and reset the relay. * There might be low voltage. Verify the unit's voltage rating. * The motor or terminals could be shorted. Inspect the motor and terminals, repairing or replacing them if necessary.
  • E
    Erin HarperAug 21, 2025
    What causes high discharge pressure in a Hitachi Chiller and how to resolve it?
    • M
      Marcus HernandezAug 21, 2025
      High discharge pressure in your Hitachi Chiller can stem from several issues: * High condenser air temperature or insufficient airflow through the condenser. Check the fan operation and clean the coil if it's clogged. * A defective check valve or a partially closed liquid line valve. Inspect the valves, capillary tubes, and strainer, replacing them if necessary. * Overcharged refrigerant. Purge the excess refrigerant. * Air or non-condensable gas in the refrigerant cycle. Purge the gas. * Suction pressure is higher than standard. See “High Suction Pressure.”
  • W
    William KramerAug 23, 2025
    What to do if the compressor does not operate on my Hitachi RCUE200AG1?
    • A
      Amanda JohnsonAug 25, 2025
      If the compressor on your Hitachi Chiller isn't operating, consider these possible causes: * The condenser fan may not be working. Address any issues with the fan. * The interlock circuit for the chilled water pump could be open. Check the pump contactor and the pump itself for faults, repairing or replacing parts as needed. * Electrical protective devices may have tripped. Identify and resolve the cause before resetting the “ON” button. * The wiring connection for the compressor power source may be incorrect. Interchange two of the three terminals (R, S, and T) at the main power source terminals.
  • P
    pdavisAug 26, 2025
    Why is the suction pressure low in my Hitachi RCUE200AG1 Chiller, and how can I fix it?
    • C
      Cameron SparksAug 27, 2025
      Low suction pressure in your Hitachi Chiller can be caused by: * Low inlet temperature of chilled water. Check the installation specifications. * Improperly adjusted or faulty expansion valve. Adjust for correct superheat, or repair/replace the valve if necessary. * Insufficient refrigerant charge. Add refrigerant. * Excessive oil in the water cooler. Purge the oil. * Scales on water cooler plates. Clean the plates.
  • T
    Tammy SharpAug 28, 2025
    How to troubleshoot insufficient cooling in a Hitachi RCUE200AG1?
    • M
      Marc SandovalAug 28, 2025
      If your Hitachi Chiller isn't cooling sufficiently, check the following: * High discharge pressure or low suction pressure. Refer to the sections on “High Discharge Pressure” and “Low Suction Pressure.” * Improper thermostat setting. Readjust the thermostat. * Defective unload mechanism. Adjust the mechanism, and repair or replace any unloaded parts if needed.
  • D
    Daniel BenjaminAug 30, 2025
    What causes a Hitachi RCUE200AG1 Chiller compressor to stop on an overcurrent relay?
    • A
      Alicia RichardsAug 30, 2025
      A Hitachi Chiller compressor might stop due to the overcurrent relay tripping because of: * Excessively high discharge and suction pressure. Refer to “High Discharge Pressure” and “High Suction Pressure”. * High or low voltage, single-phase condition, or phase imbalance. Check the power supply line and contactors, repairing as necessary. * Loose connection. Tighten the loose electrical connection or repair it if needed. * Faulty compressor motor. Check the compressor motor and repair or replace it if necessary. * Faulty overcurrent relay. Replace the relay if necessary.
  • J
    Jennifer JohnsonSep 1, 2025
    Why does the compressor stop on the freeze protection thermostat in my Hitachi Chiller?
    • J
      Jason SullivanSep 1, 2025
      The compressor in your Hitachi Chiller might stop due to the freeze protection thermostat for these reasons: * Excessively low chilled water outlet temperature. Check for an excessively low setting on the chilled water setting knob. * Defective thermistor. Check for malfunction of the thermistor and replace it if necessary. * Shortage of chilled water flow. Check the rotation of the pump. * Air in the water circuit. Purge the air.
  • A
    Andrew BakerSep 3, 2025
    What could cause high suction pressure in a Hitachi RCUE200AG1 Chiller?
    • J
      James HowellSep 3, 2025
      High suction pressure in a Hitachi Chiller can result from: * High inlet temperature of chilled water. Check the insulation of the piping and the installation specifications. * Excessive opening of the expansion valve. Readjust the opening or replace the valve if it's defective.
  • J
    Jeffrey CunninghamSep 5, 2025
    Why does my Hitachi Chiller compressor stop on the high pressure switch?
    • J
      Jessica OdonnellSep 5, 2025
      The Hitachi Chiller compressor may stop due to the high pressure switch for the following reasons: * Excessively high discharge pressure. See “High Discharge Pressure”. * Malfunction of the high pressure switch. Readjust the setting or replace it if defective.
  • L
    lindathompsonSep 7, 2025
    What causes the compressor to stop on the internal thermostat in a Hitachi RCUE200AG1?
    • A
      ann39Sep 7, 2025
      The compressor in your Hitachi Chiller may stop on the internal thermostat or discharge gas thermostat due to: * High or low voltage, single-phase condition, or phase imbalance. Check the power supply line and contactor, repairing if necessary. * Excessive superheat. Check for refrigerant leakage and a faulty solenoid valve for liquid bypass. * Defective element. Check the contact of the internal thermostat during the cold condition. * Excessive high discharge pressure and low suction pressure. See “High Discharge Pressure” and “Low Suction Pressure.”

Summary

Important Notices and Working Range

Safety Hazard Definitions

Defines DANGER, WARNING, and CAUTION signal words for hazard identification.

Compressor Details and Operation

Twin Screw Compressor System

Details the Twin Screw Compressor, its features, and the principle of compression.

Continuous Capacity Control Mechanism

Explanation of the slide valve system for precise capacity adjustment.

Energy Saving and Control System

Control System Functions

Overview of control board functions and precise temperature control capabilities.

Heat Exchanger Technology

Plate Type Evaporator and Air-Cooled Condenser

Details advantages of plate type evaporators and high-performance air-cooled condensers.

Operation Instructions and Troubleshooting

Starting and Stopping the Chiller

Step-by-step guide for starting and stopping Hitachi Air-Cooled Water Chillers.

Unit Operation Troubleshooting

Common operational issues like start failure or poor cooling, with troubleshooting steps.

Initial Installation Preparations

Unit Transportation Procedures

Transportation Methods and Safety

Instructions for transporting the unit via rigging or rollers, including critical safety warnings.

Installation Electrical Wiring

Main Power and Control Wiring Procedures

Step-by-step guide for main power wiring, earthing, and control wiring connections.

Control Wiring and System Connections

BMS Connection Wiring

Details on connecting the BMS interface unit (HARC70-CE1) and control wiring.

Water Piping Installation

Chilled Water Piping Guidelines

Recommendations for chilled water piping, including flexible joints, valves, and insulation.

Building Management System (BMS) Connection

System Overview and Signal List

Final Installation Work Checklist

Installation Work Verification

Test Running Procedures

Test Running Preparation and Execution

Steps for preparing and performing the chiller's test run, including safety checks.

Controller Adjustment Settings

Controller Panel Overview and Switches

Specific Controller Setting Explanations

Detailed Controller Adjustments

Continuous Capacity Control Settings

Advanced Controller Settings

DSW5 Settings for Capacity Control

Self-Inspection Functions and Alarms

Alarm Indication Codes

Lists alarm codes displayed on the control panel and their corresponding issues.

Checking Operational Parameters

Checking Input Parameters

Control System Operation Sequences

Control System Operation Sequences (Continued)

Maintenance Overview and Component Checks

Component Maintenance Requirements

Heat Exchanger Cleaning Procedures

Plate Heat Exchanger Cleaning Method

Detailed steps for cleaning plate type heat exchangers and water piping.

Seasonal Maintenance and Refrigeration Cycle

Part Replacement and Refrigerant Handling

Compressor Removal Procedures

Step-by-Step Compressor Removal

Detailed instructions for safely removing the compressor from the unit.

Safety and Protection Controls

Compressor and Fan Motor Protection

Details on safety devices protecting the compressor and fan motors from overloads.

Normal Operation and Safety Device Activation

Normal Operating Pressure Ranges

Troubleshooting Common Issues

Fan and Compressor Operation Faults

Troubleshooting steps for condenser fan and compressor operational problems.

Troubleshooting Cooling and Pressure Issues

Compressor Stops and Cooling Performance Faults

Addresses issues like compressor stops, insufficient cooling, and pressure-related problems.

General Specifications Overview

General Specifications Overview (Continued)

Power Circuit Wiring Diagrams

Power Circuit for RCUE40-70 AG1

Electrical diagram showing the power circuit for RCUE40, 50, 60, and 70AG1 models.

Power Circuit Wiring Diagrams (Continued)

Power Circuit for RCUE80-140 AG1

Electrical diagram showing the power circuit for RCUE80, 100, 120, and 140AG1 models.

Power Circuit for RCUE150-200 AG1

Electrical diagram showing the power circuit for RCUE150, 180, and 200AG1 models.

Power Circuit for RCUE240-270 AG1

Electrical diagram showing the power circuit for RCUE240 and 270AG1 models.

Power Circuit for RCUE300-330 AG1

Electrical diagram showing the power circuit for RCUE300 and 330AG1 models.

Power Circuit for RCUE360-400 AG1

Electrical diagram showing the power circuit for RCUE360 and 400AG1 models.

Control Circuit Wiring Diagrams

Control Circuit for RCUE40-70 AG1

Electrical diagram showing the control circuit for RCUE40, 50, 60, and 70AG1 models.

Control Circuit Wiring Diagrams (Continued)

Control Circuit for RCUE80-140 AG1

Electrical diagram showing the control circuit for RCUE80, 100, 120, and 140AG1 models.

Control Circuit for RCUE150-200 AG1

Electrical diagram showing the control circuit for RCUE150, 180, and 200AG1 models.

Control Circuit for RCUE240-270 AG1

Electrical diagram showing the control circuit for RCUE240 and 270AG1 models.

Control Circuit for RCUE300-330 AG1

Electrical diagram showing the control circuit for RCUE300 and 330AG1 models.

Control Circuit for RCUE360-400 AG1

Electrical diagram showing the control circuit for RCUE360 and 400AG1 models.

Printed Circuit Board Diagrams

Main Printed Circuit Board (Master) Diagram

Subsidiary Printed Circuit Board Diagrams

Relay Printed Circuit Board (Subsidiary) Diagrams

Relay Printed Circuit Board Diagrams (Continued)

Relay PCB Layouts for Various Models

Relay PCB Layouts for Higher Capacity Models

Customer Wiring Diagram

Low Voltage Remote Control and BMS Wiring

Wiring diagram illustrating connections for remote control and BMS.

Component Data - Compressor and Condenser Specifications

Compressor Unit Specifications

Condenser and Condenser Fan Specifications

Model Selection Process

Performance Tables (R407 C)

Performance Data for RCUE40-70 AG1

Performance data (Capacity, Input, COP) for RCUE40, 50, 60, 70AG1 models.

Performance Tables (R407 C) (Continued)

Performance Data for RCUE80-140 AG1

Performance data (Capacity, Input, COP) for RCUE80, 100, 120, 140AG1 models.

Performance Data for RCUE150-240 AG1

Performance data (Capacity, Input, COP) for RCUE150, 180, 200, 240, 270AG1 models.

Performance Data for RCUE270-400 AG1

Performance data (Capacity, Input, COP) for RCUE270, 300, 330, 360, 400AG1 models.

Performance Data for RCUE360-400 AG1

Performance data (Capacity, Input, COP) for RCUE360 and 400AG1 models.

Electrical Data for Model Selection

Electrical Specifications (R407 C)

Application Data - Part Load Performance

Part Load Performance Data (RCUE40-100 AG1)

Application Data - Part Load Performance (Continued)

Part Load Performance Data (RCUE120-400 AG1)

Application Data - Ethylene Glycol Use

Ethylene Glycol Application for Low Ambient

Component Data - Water Cooler Specifications

Water Cooler Details

Hitachi RCUE200AG1 Specifications

General IconGeneral
Cooling Capacity200 kW
Power Supply400V / 3Ph / 50Hz
Compressor TypeScrew
TypeAir Cooled
Capacity200 kW
Operating Temperature Range -10 to 45 °C

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