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Hitachi RCUE60AG1 - User Manual

Hitachi RCUE60AG1
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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

  • R
    Rebecca BellAug 19, 2025
    How to fix a Hitachi Chiller when the condenser fan does not operate?
    • J
      Jennifer WatkinsAug 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.
  • D
    Dr. Sarah StoneAug 21, 2025
    What causes high discharge pressure in a Hitachi RCUE60AG1 Chiller and how to resolve it?
    • K
      kramerrichardAug 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.”
  • P
    pberryAug 25, 2025
    What to do if the compressor does not operate on my Hitachi Chiller?
    • J
      Jessica RandolphAug 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.
  • J
    Jennifer BenjaminAug 26, 2025
    Why is the suction pressure low in my Hitachi RCUE60AG1, and how can I fix it?
    • T
      Tiffany BlanchardAug 26, 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.
  • M
    Matthew BrownAug 28, 2025
    How to troubleshoot insufficient cooling in a Hitachi Chiller?
    • L
      llewisAug 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.
  • C
    Christopher LongAug 30, 2025
    What causes a Hitachi RCUE60AG1 compressor to stop on an overcurrent relay?
    • T
      Timothy SmithAug 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.
  • E
    evanschristineSep 1, 2025
    Why does the compressor stop on the freeze protection thermostat in my Hitachi Chiller?
    • D
      David BrownSep 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
    Alan NicholsSep 3, 2025
    What could cause high suction pressure in a Hitachi RCUE60AG1 Chiller?
    • S
      Susan BradfordSep 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.
  • D
    David JacobsSep 5, 2025
    Why does my Hitachi RCUE60AG1 Chiller compressor stop on the high pressure switch?
    • M
      Michael ZunigaSep 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.
  • J
    Jordan PerrySep 7, 2025
    What causes the compressor to stop on the internal thermostat in a Hitachi RCUE60AG1?
    • L
      Logan JacksonSep 8, 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 Notice and Operating Range

Operation Instructions for Chillers

Hitachi Air-Cooled Water Chillers Operation

Provides instructions for starting and stopping the unit, daily checks, and troubleshooting.

Preparation and Initial Check Procedures

Initial Site and Material Checks

Covers required materials, installation location, space, and foundation checks.

Unit Placement and Unpacking Procedures

Details precautions and steps for placing the unit, including unpacking.

Service Space and Foundation Requirements

Shows required service space and foundation details with diagrams.

Transportation Guidelines and Safety Precautions

Explains transportation methods like rigging and rollers, with safety precautions.

Installation Procedures

Electrical Wiring and Connections Guide

Details tools, schedule checks, main power wiring procedures, and control wiring.

Water Piping and Connections Guide

Provides guidelines for water piping connections, including valve usage and insulation.

BMS Connection and System Setup

Final Installation Checks and Verification

A checklist for verifying installation work quality and adequacy.

Test Running Procedures

Performing the Test Run

Describes the procedure for performing test runs on the unit.

Controller Adjustment and Settings

Key Temperature and Zone Settings

Compressor and Mode Control Settings

Details Capacity Control, Delay Time, Mode Switches, and Pump Operation.

Control System Overview and Adjustment

Control System Architecture and Components

Detailed Controller Adjustment Parameters

Specific Controller Settings and Switches

Capacity Control and Compressor Cycling Settings

Explains DSW5 settings for capacity control and DSW2 for compressor cycling.

Manual Stop and Load-up;down Settings

Additional Controller Settings and Options

DSW4 Settings and Anti-freeze Control

Self-Inspection Functions and Indicators

Alarm Indication Codes and Meanings

Explains how alarm codes are indicated on the control panel and lists common alarm codes.

Indication of Operation Conditions

Checking Specific Operational Parameters

Control System Operation Sequences

Standard Operation Sequence RCUE 40-70 AG1

Standard Operation Sequence RCUE 80-140 AG1

Standard Operation Sequence RCUE 150-270 AG1

Standard Operation Sequence RCUE 300-400 AG1

Maintenance Procedures and Guidelines

Component Maintenance Overview

Cleaning Methods for Heat Exchangers

Provides a method for cleaning heat exchangers and water piping.

Seasonal Shutdown and Start-up Procedures

Refrigeration Cycle Maintenance and Charging

Covers strainer checks and refrigerant charging procedures.

Compressor Removal and Handling Procedures

Safety and Protection Control Settings

Explains various safety and protection controls for compressors, fans, and the refrigeration cycle.

Normal Operating Pressure Checks

Troubleshooting Guide for Common Issues

Condenser Fan and Compressor Operational Faults

Lists possible causes and corrective actions for fan and compressor operational faults.

Compressor Protection and Stop Faults

Details causes and actions for compressor stops due to pressure, relay, or thermostat issues.

Cooling Performance and Noise Troubleshooting

Addresses causes and corrective actions for insufficient cooling, noisy operation, and misc. noise.

Pressure and Flow Related Faults

Explains causes and actions for faults related to high/low pressure, and flow problems.

Technical Drawings and Diagrams

Wiring Diagrams - Power Circuits

Shows the power circuit wiring diagram for various model groups.

Wiring Diagrams - Control Circuits

Shows the control circuit wiring diagram for specific models.

Printed Circuit Board Layouts

Customer Wiring Diagram

Model Selection and Performance Data

Model Selection Example

Performance Tables for R407 C Models

Electrical Data for R407 C Models

Hitachi RCUE60AG1 Specifications

General IconGeneral
RefrigerantR-410A
Number of Compressors2
TypeAir-cooled scroll chiller
EER10.5
Sound Pressure Level78 dBA

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