Hitachi RCUE180AG1 - User Manual

Questions and Answers

C
Cindy PenaAug 19, 2025
How to fix a Hitachi RCUE180AG1 Chiller when the condenser fan does not operate?
- Y
  yclarkAug 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.
M
Mark HansonAug 21, 2025
What causes high discharge pressure in a Hitachi Chiller and how to resolve it?
- K
  Kristy ClarkAug 22, 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.”
M
Marcus SteeleAug 25, 2025
What to do if the compressor does not operate on my Hitachi Chiller?
- B
  Brandy AlvarezAug 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.
K
kmartinAug 26, 2025
Why is the suction pressure low in my Hitachi RCUE180AG1, and how can I fix it?
- J
  Jennifer RoseAug 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.
F
Fernando MolinaAug 28, 2025
How to troubleshoot insufficient cooling in a Hitachi RCUE180AG1 Chiller?
- F
  Frank Baker DVMAug 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
Derrick FarrellAug 30, 2025
What causes a Hitachi Chiller compressor to stop on an overcurrent relay?
- B
  Brittney MontesAug 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.
M
Mrs. Sara NashSep 1, 2025
Why does the compressor stop on the freeze protection thermostat in my Hitachi RCUE180AG1?
- W
  wrightmichaelSep 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.
G
Gregory GuzmanSep 3, 2025
What could cause high suction pressure in a Hitachi Chiller?
- M
  Mason MeltonSep 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.
S
Steve Morgan DDSSep 5, 2025
Why does my Hitachi RCUE180AG1 compressor stop on the high pressure switch?
- M
  Mr. Michael LopezSep 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
Laurie HouseSep 7, 2025
What causes the compressor to stop on the internal thermostat in a Hitachi Chiller?
- F
  fernandoperrySep 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

Operation Instructions

Hitachi Air-Cooled Water Chillers

Procedures for starting, stopping, daily checking, and basic troubleshooting.

Preparation Initial Check

Initial Check

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

Placing the Unit

Guidelines for safely placing the unit, including unpacking and handling.

Installation

Electrical Wiring

Procedures for main power and control wiring, including safety checks.

Water Piping

Guidelines for connecting chilled water piping, including valve usage and insulation.

Installation Final Check

A checklist for final inspection of the installation work.

Test Running

Preparation

Lists necessary tools and instruments for test running.

Test Running

Step-by-step procedures for conducting the unit test run.

Instructions After Test Running

Guidance for customer instruction and handover after successful test running.

Controller Adjustment

Control System

Overview of the control system, capacity control, and control panel functions.

Controller Adjustment

Details on setting parameters like temperature, type, and capacity control.

Self-Inspection Functions

Alarm Indication

Explains alarm codes displayed on the control panel and their meanings.

Control System

Maintenance

Components

Overview of components requiring periodic inspection and maintenance.

Lubrication

Information on compressor lubrication and oil requirements.

Deposits

Cleaning Method

Safety and Protection Control

Details on safety devices and their functions for unit protection.

Normal Operating Pressure

Troubleshooting

Servicing for R407 C Refrigerant System

Fault Diagnosis and Corrective Actions

Table listing common faults, possible causes, and corrective actions.

Model Selection

Performance Table (R407 C)

Detailed performance data for various models under different conditions.

Electrical Data (R407 C)

Summary

Operation Instructions

Hitachi Air-Cooled Water Chillers

Procedures for starting, stopping, daily checking, and basic troubleshooting.

Preparation Initial Check

Initial Check

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

Placing the Unit

Guidelines for safely placing the unit, including unpacking and handling.

Installation

Electrical Wiring

Procedures for main power and control wiring, including safety checks.

Water Piping

Guidelines for connecting chilled water piping, including valve usage and insulation.

Installation Final Check

A checklist for final inspection of the installation work.

Test Running

Preparation

Lists necessary tools and instruments for test running.

Test Running

Step-by-step procedures for conducting the unit test run.

Instructions After Test Running

Guidance for customer instruction and handover after successful test running.

Controller Adjustment

Control System

Overview of the control system, capacity control, and control panel functions.

Controller Adjustment

Details on setting parameters like temperature, type, and capacity control.

Self-Inspection Functions

Alarm Indication

Explains alarm codes displayed on the control panel and their meanings.

Control System

Maintenance

Components

Overview of components requiring periodic inspection and maintenance.

Lubrication

Information on compressor lubrication and oil requirements.

Deposits

Cleaning Method

Safety and Protection Control

Details on safety devices and their functions for unit protection.

Normal Operating Pressure

Troubleshooting

Servicing for R407 C Refrigerant System

Fault Diagnosis and Corrective Actions

Table listing common faults, possible causes, and corrective actions.

Model Selection

Performance Table (R407 C)

Detailed performance data for various models under different conditions.

Electrical Data (R407 C)

Hitachi RCUE180AG1 Specifications

General

Brand	Hitachi
Model	RCUE180AG1
Category	Chiller
Language	English

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Hitachi RCUE180AG1 - User Manual

Table of Contents

Questions and Answers

Summary

Operation Instructions

Hitachi Air-Cooled Water Chillers

Preparation Initial Check

Initial Check

Placing the Unit

Installation

Electrical Wiring

Water Piping

Installation Final Check

Test Running

Preparation

Test Running

Instructions After Test Running

Controller Adjustment

Control System

Controller Adjustment

Self-Inspection Functions

Alarm Indication

Control System

Maintenance

Components

Lubrication

Deposits

Cleaning Method

Safety and Protection Control

Normal Operating Pressure

Troubleshooting

Servicing for R407 C Refrigerant System

Fault Diagnosis and Corrective Actions

Model Selection

Performance Table (R407 C)

Electrical Data (R407 C)

Summary

Operation Instructions

Hitachi Air-Cooled Water Chillers

Preparation Initial Check

Initial Check

Placing the Unit

Installation

Electrical Wiring

Water Piping

Installation Final Check

Test Running

Preparation

Test Running

Instructions After Test Running

Controller Adjustment

Control System

Controller Adjustment

Self-Inspection Functions

Alarm Indication

Control System

Maintenance

Components

Lubrication

Deposits

Cleaning Method

Safety and Protection Control

Normal Operating Pressure

Troubleshooting

Servicing for R407 C Refrigerant System

Fault Diagnosis and Corrective Actions

Model Selection

Performance Table (R407 C)

Electrical Data (R407 C)

Hitachi RCUE180AG1 Specifications

Related product manuals