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Hitachi RAS-10JH4 User Manual

Hitachi RAS-10JH4
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AW NO. 0041E
SERVICE MANUAL
TECHNICAL INFORMATION
REFER TO THE FOUNDATION MANUAL
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
SPECIFICATIONS ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
HOW TO USE ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
CONSTRUCTION AND DIMENSIONAL DIAGRAM
‥‥
MAIN PARTS COMPONENT ‥‥‥‥‥‥‥‥‥‥
WIRING DIAGRAM ‥‥‥‥‥‥‥‥‥‥‥‥‥‥
BLOCK DIAGRAM‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
BASIC MODE‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
REFRIGERATING CYCLE DIAGRAM ‥‥‥‥‥‥
DESCRIPTION OF MAIN CIRCUIT OPERATION
‥‥‥
SERVICE CALL Q & A ‥‥‥‥‥‥‥‥‥‥‥‥
TROUBLE SHOOTING ‥‥‥‥‥‥‥‥‥‥‥‥
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY
‥‥
PARTS LIST AND DIAGRAM ‥‥‥‥‥‥‥‥‥
CONTENTS
4
5
22
24
26
29
30
37
38
68
72
102
105
INDOOR UNIT
RAS-10JH4
RAS-14JH4
OUTDOOR UNIT
RAC-10JH4
RAC-14JH4
RAS-10JH4 / RAC-10JH4
RAS-14JH4 / RAC-14JH4
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
RAS-10JH4 RAC-10JH4
DC INVERTER (WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
790
298
210
10
COOLING
HEATING
INDOOR UNIT OUTDOOR UNIT
1 PHASE, 50Hz, 220-230V
3.70 - 3.53
2.50 (1.60 - 3.10)
8,530 (5,459 - 10,577)
4.71 - 4.50
3.40 (1.70 - 4.00)
11,600 (5,800 - 13,648)
750(+91)
※
(+47)
※
548
288
35
RAS-14JH RAC-14JH
790
298
210
10
INDOOR UNIT OUTDOOR UNIT
1 PHASE, 50Hz, 220-230V
3.50 (1.60 - 3.80)
11,940 (5,459 - 12,966)
1,100 (400 - 1,400)
4.20 (1.70 - 5.00)
14,330 (5,800 - 17,060)
750(+91)
※
(+47)
※
548
288
35
After installation
※
Hitachi Household Appliances (Wuhu) Co., Ltd.
44
690 (400 - 1,120)
880 (400 - 1,160)
1080 (400 - 1,300)
5.17 - 4.94
5.26 - 5.03
Question and Answer IconNeed help?

Do you have a question about the Hitachi RAS-10JH4 and is the answer not in the manual?

Hitachi RAS-10JH4 Specifications

General IconGeneral
TypeSplit System
Cooling Capacity2.5 kW
Heating Capacity3.2 kW
Power Supply220-240V, 50Hz
RefrigerantR410A
Energy Efficiency Ratio (EER)3.21
Indoor Unit Weight9 kg
Outdoor Unit Noise Level48 dB(A)

Summary

Service Manual Technical Information

Specifications

Lists technical specifications for the air conditioner models.

Safety During Repair Work

Working Standards for Preventing Semiconductor Breakage

Items to be Observed in Handling

Details specific procedures and precautions for handling electronic components.

Caution

Specifications

Safety Precautions

Precautions During Installation

Safety measures and considerations required during the installation process of the air conditioner.

Precautions During Shifting or Maintenance

Safety guidelines for moving the unit or performing maintenance tasks to prevent hazards.

Precautions During Operation

Essential safety advice for operating the air conditioner correctly and avoiding risks.

Names and Functions of Each Part

Indoor Unit Parts

Lists and describes the components found within the indoor unit of the air conditioner.

Outdoor Unit Parts

Lists and describes the components found within the outdoor unit of the air conditioner.

Model Name and Dimensions

Provides identification details and physical dimensions for the air conditioner models.

Indoor Unit Control Panel

Explains the functions and layout of the control panel on the indoor unit.

Two Way Air Exchange Duct Filter

Describes the purpose and location of the duct filter for air exchange.

Indoor Unit Indicators

Remote Controller

Details the functionality and operation of the wireless remote control for the air conditioner.

Filter and Air Quality System Installation

Precautions for Use

Important user guidelines and safety tips for operating the air conditioner with installed filters.

Air Intake Filter and Air Exchange Procedures

Various Functions

Explains the various operational modes and features available for the air conditioner.

Automatic Operation

Describes how the air conditioner automatically adjusts its operation based on environmental conditions.

Auto Restart Control

Details the automatic restart function after a power failure and its configuration.

Heating Operation

Direct Selection

How to directly select the heating operation mode using the remote control.

Manual Selection

Steps for manually adjusting heating operation parameters like fan speed and temperature.

Defrosting

Information on the automatic defrosting process during heating operation.

Dehumidifying Operation

Dehumidifying Function

Explains the specific functions and settings related to dehumidification.

Cooling Operation

Instructions for operating the air conditioner in cooling mode.

Direct Selection

How to directly select the cooling operation mode.

Manual Selection

Steps for manually adjusting cooling operation parameters.

Air Purifier Operation (Fan)

Fan Operation

Details on operating the fan independently or in conjunction with other modes.

Two Way Air Exchange Operation

Explains the operation of the two-way air exchange system for ventilation.

Self Clean Operation

Automatic Two Way Air Exchange Operation

How the unit automatically manages air exchange based on detected air quality.

How to Set the Timer

Guides on setting various timer functions for operation scheduling.

How to Set the Sleep Timer

How to Cancel Reservation

Procedure for cancelling any set timer reservations.

Fresh Air In During Sleep Mode Operation

Adjusting Air Deflectors

Instructions on how to adjust the direction of airflow using the unit's deflectors.

Maintenance Procedures

Opening the Front Panel

How to safely open the front panel to access internal components.

Removing Pre-Filters

Steps for removing the air intake pre-filters for cleaning or replacement.

Removing Filter Cases

Procedure for removing the specialized filter cases for cleaning.

Removing Exhaust Pre-Filter

Steps for removing the exhaust pre-filter.

Confirm Removed Filters

Guidance on checking the condition of filters after removal.

Maintenance Actions

Wash Removed Filters

Instructions for washing the unit's filters with water.

Attaching Filter Cases

Procedure for correctly reinstalling the specialized filter cases.

Attaching Pre-Filters

Steps for properly reattaching the air intake pre-filters.

Close Front Panel

How to correctly close the front panel after maintenance.

Pre-Filter Cleaning Procedure

Specific steps for cleaning the pre-filter component.

Front Panel and Top Grill Cleaning

Instructions for cleaning the unit's front panel and top grill.

Maintenance and Setup

Maintenance at Beginning of Long Off Period

Steps to prepare the unit for extended periods of non-operation.

How to Exchange Batteries in Remote Controller

Guide on replacing the batteries in the remote control unit.

Address Changing Switch

Information on the address changing switch and its function.

Understanding Operating Mechanism

Heating Capability

Details on how the unit provides heating and its performance characteristics.

Cooling and Dehumidifying Capabilities

Explains the unit's functions for cooling and reducing humidity.

Capabilities

General overview of the unit's operational capabilities.

Various Functions

Explains the diverse operational modes and features of the air conditioner.

Timer Programming/Sleep Timer Operation

Guides on setting timers for automatic operation and sleep mode.

Operating Mechanism Details

Air Purifier Operation

Explains the functionality and operation of the air purification system.

Two Way Air Exchange Operation

Details the operation of the two-way air exchange system for improved ventilation.

Sleep Timer Operation

Further explanation of the sleep timer and its effects on operation.

Fresh Air In During Sleep Mode Operation

Adjusting Air Deflectors

Instructions on how to adjust the direction of airflow using the unit's deflectors.

Construction and Dimensional Diagram

Indoor Unit

Diagram illustrating the construction and dimensions of the indoor unit.

Construction and Dimensional Diagram

Outdoor Unit

Diagram illustrating the construction and dimensions of the outdoor unit.

Main Parts Component

Thermostat

Details the specifications and function of the thermostat component.

Fan Motor

Information on the fan motor, including specifications and connection details.

Main Electric Components for Outdoor Unit

Lists key electrical components used in the outdoor unit.

Compressor Motor

Wiring Diagram

Block Diagram

Unit Capabilities and Functions

Heating Capability

Describes the unit's performance and characteristics when operating in heating mode.

Cooling and Dehumidifying Capabilities

Explains the unit's functions for cooling and reducing humidity.

Capabilities

General overview of the unit's operational capabilities.

Various Functions

Explains the diverse operational modes and features of the air conditioner.

Timer Programming/Sleep Timer Operation

Guides on setting timers for automatic operation and sleep mode.

Operating Mechanism Details

Air Purifier Operation

Explains the functionality and operation of the air purification system.

Two Way Air Exchange Operation

Details the operation of the two-way air exchange system for improved ventilation.

Sleep Timer Operation

Further explanation of the sleep timer and its effects on operation.

Mode Data File

Basic Cooling Operation

Cooling Sleep Operation and One-More Timer

Cooling Defrost

Explains the defrost process specifically for cooling operations.

Dehumidifying Operation

Instructions for operating the air conditioner in dehumidifying mode.

Dehumidifying Sleep Operation

Details the dehumidifying mode combined with sleep timer functionality.

Basic Heating Operation

Reversing Valve Defrosting

Explains the defrost process using the reversing valve during heating.

Heating Sleep Operation and One-More Timer

Details the heating sleep mode and the one-more timer function.

Refrigerating Cycle Diagram

Description of Main Circuit Operation

1. Reset Circuit

Details the reset circuit's function in initializing the microcomputer upon power changes.

Main Circuit Operation Details

2. Receiver Circuit

Describes the circuit responsible for receiving signals from the remote controller.

3. Buzzer Circuit

Explains the function of the buzzer circuit for audible feedback.

Main Circuit Operation Details

4. Snap Motor Circuit

Details the circuit controlling the snap motors for air deflectors and dampers.

Main Circuit Operation Details

5. Initial Setting Circuit (IC401)

Explains the circuit that sets initial values for the microcomputer upon power-up.

6. Power Supply

Describes the power supply circuits that generate necessary voltages for unit operation.

Main Circuit Operation Details

7. Fan Motor Drive Circuit

Details the circuit responsible for driving and controlling the fan motor speed.

Main Circuit Operation Details

8. Ventilation Fan Motor Circuit

Explains the circuit for the ventilation fan motor and its abnormality detection.

Main Circuit Operation Details

9. Dirt Sensor (Gas Sensor) Circuit

Describes the function and circuit of the dirt sensor for air quality monitoring.

Outdoor Unit Electrical Parts Overview

Main P.W.B.

Details the functions of the main printed wiring board in the outdoor unit.

Power P.W.B.

Details the functions of the power printed wiring board in the outdoor unit.

Harmonics Improvement Circuit

Explains the circuit designed to improve power factor and reduce harmonics.

Power Circuit Details

2. Power Circuit

Describes the main power conversion and distribution circuits.

Main Parts

Lists and explains the primary components within the power circuit.

Power Circuit Details

Indoor/Outdoor Interface Circuit

3-1 Communication Outdoor to Indoor

Describes the signal transmission from the outdoor unit's microcomputer to the indoor unit.

3-2 Communication Indoor to Outdoor

Describes the signal transmission from the indoor unit's microcomputer to the outdoor unit.

Interface Circuit Details

Control P.W.B.

Details the control printed wiring board involved in unit communication.

Power P.W.B.

Details the power printed wiring board involved in unit communication.

Interface Circuit Waveforms

Fig. 3-2 Voltages Waveforms

Shows voltage waveforms for outdoor to indoor unit communications.

Fig. 3-3 Voltages Waveforms

Shows voltage waveforms for indoor to outdoor unit communications.

Serial Communications Format

1. Outdoor to Indoor Communication

Explains the format of data sent from the outdoor unit to the indoor unit.

2. Indoor to Outdoor Communication

Explains the format of data sent from the indoor unit to the outdoor unit.

3. Communications Waveforms

Illustrates the waveforms associated with serial communication data.

Serial Communications Data

1. Outdoor Message

Details the data content of messages sent from the outdoor unit.

2. Indoor Message

Details the data content of messages sent from the indoor unit.

IPM (Intelligent Power Module) Diagnosis

Circuit Diagram of the Device

Shows the circuit diagram associated with the IPM device.

Circuit Diagram of the Module

Illustrates the internal circuit diagram of the IPM module itself.

Terminals Symbol Mark of the Module

Identifies the terminal markings and symbols on the IPM module.

IPM Operation Switching

IPM Diagnosis Details

Reference

Contains cross-references and notes related to IPM diagnosis and failure indications.

IPM Drive Circuit

Power Circuit for P.W.B.

Power Circuit Voltage Specifications

Microcomputer Peripheral Circuits

6-1. Overload Control Circuit (OVL)

Describes the circuit that controls overload conditions to protect components.

Microcomputer Peripheral Circuits

1. IS OVL

Details the IS OVL circuit for monitoring and limiting total system current.

2. ID OVL

Details the ID OVL circuit for monitoring and limiting compressor current.

Microcomputer Peripheral Circuits

3. Start Current Control

Explains the circuit that maintains constant start current for smooth compressor operation.

Microcomputer Peripheral Circuits

6-2. Reset Circuit

Details the reset circuit that initializes the microcomputer program.

Temperature Detection Circuit

Reversing Valve Control Circuit

Electric Expansion Valve Control Circuit

Outdoor DC Fan Motor Control Circuit

Outdoor DC Fan Motor Control Circuit Details

Service Call Q & A

Cooling Mode

Q&A related to problems encountered during cooling operation.

Dehumidifying Mode

Q&A related to problems encountered during dehumidifying operation.

Heating Mode

Q&A related to problems encountered during heating operation.

Service Call Q & A Troubleshooting

Auto Fresh Defrosting

Q&A regarding the auto fresh defrosting function.

Auto Operation

Q&A related to the automatic operation mode.

Nice Temperature Reservation

Q&A regarding the nice temperature reservation feature.

Infrared Remote Control

Q&A related to the functionality of the infrared remote control.

Service Call Q & A Others

Two Way Air Exchange Mode Q&A

Trouble Shooting

Precautions for Checking

Essential safety precautions to follow before performing checks and diagnostics.

Discharge Procedure and Power Shut Off

Discharge Procedure

Step-by-step instructions for safely discharging electrical components.

Structure of Indoor Unit Electric Parts

Removing Electrical Parts

Steps for safely removing electrical components from the indoor unit.

How to Remove Control P.W.B.

Instructions for removing the control printed wiring board.

How to Remove Indicating P.W.B. (Display)

Steps for removing the indicating printed wiring board at the display panel.

How to Remove Indicating P.W.B. (Switch)

Instructions for removing the indicating printed wiring board at the switch.

Structure of Indoor Unit Electric Parts

1. Electrical Parts (Outdoor Unit)

Describes the electrical parts located in the outdoor unit.

Removing P.W.B.s (Outdoor Unit)

Steps for removing printed wiring boards from the outdoor unit.

C. Power Factor Improvement Capacitor

Details the power factor improvement capacitor and its replacement procedure.

Precautions for Servicing

Removing P.W.B.s (Outdoor Unit)

Steps for removing printed wiring boards from the outdoor unit.

C. Power Factor Improvement Capacitor

Specific instructions for handling the power factor improvement capacitor during servicing.

Other Cautions

1. Cautions Concerning ICP (IC Protector)

Specific warnings and precautions when working with ICP (IC Protector) components.

Support Function of Failure Diagnosis

1. Self-diagnosis Indication Function

Describes how the unit indicates detected failures through lamps and blinking patterns.

2. Self-diagnosis Memory

Explains how failure data is stored and can be accessed for analysis.

3. Self-diagnosis of Communication Circuit

Details the function for diagnosing communication circuit issues.

Self-Diagnosis Memory Function

How to Redisplay Diagnosed Failure Modes

Step-by-step guide to view previously stored failure information.

How to Clear Failure Diagnosis Data

Procedure for clearing the stored failure diagnosis data.

Self-Diagnosis Lighting Mode

Outdoor Unit Operations and Diagnosis

Checking Electrical Parts and Refrigerating Cycle

Checking Indoor/Outdoor Unit Electrical Parts

Procedures for diagnosing electrical issues in both indoor and outdoor units.

Checking the Refrigerating Cycle

Steps for diagnosing problems related to the unit's refrigerating cycle.

Checking Indoor Unit Electrical Parts

1. Power Does Not Come On (No Operation)

Troubleshooting steps when the unit fails to power on or operate.

Checking Indoor Unit Electrical Parts

2. Indoor Fan Does Not Operate

Troubleshooting steps when the indoor fan fails to operate, with others normal.

3. Air Deflector Does Not Move

Troubleshooting steps when the air deflectors fail to move, with others normal.

Checking Indoor Unit Electrical Parts

4. Check the Control P.W.B. (Power Circuit)

Steps for checking the control printed wiring board and its power circuit.

Checking Indoor Unit Electrical Parts

5. Failure Phenomenon: Ventilation Fan Motor Does Not Operate

Diagnosing and resolving issues where the ventilation fan motor fails to operate.

Troubleshooting Start

Initial steps to begin diagnosing ventilation fan motor issues.

Checking Indoor Unit Electrical Parts

6. Failure Phenomenon: Two Way Air Exchange Lamp Blinks

Diagnosing and resolving issues related to the two-way air exchange lamp blinking.

Troubleshooting Start

Initial steps to begin diagnosing two-way air exchange lamp blinking issues.

Checking the Remote Controller

Using the Test Card

Method for testing remote control functionality using a specialized test card.

Precautions for Servicing

Removing P.W.B.s (Outdoor Unit)

Steps for removing printed wiring boards from the outdoor unit.

C. Power Factor Improvement Capacitor

Specific instructions for handling the power factor improvement capacitor during servicing.

Power Factor Improvement Capacitor

Checking Outdoor Unit Electrical Parts

No Operation or Abnormal Operation

Diagnostic steps when the outdoor unit shows no operation or abnormal behavior.

Checking Outdoor Unit Electrical Parts

Checking Outdoor Unit Electrical Parts

Checking Outdoor Unit Electrical Parts

Checking Outdoor Unit Electrical Parts

Thermistor Abnormal

Diagnosing issues when thermistors report abnormal readings.

Checking Outdoor Unit Electrical Parts

OH Thermistor Temperature Rise

Diagnosing issues related to overheating detected by the OH thermistor.

Overload Lower Limit Cut

Troubleshooting steps for overload protection triggering.

Failure of Switching

Diagnosing issues related to switching failures within the unit.

Abnormal Low Speed

Troubleshooting steps for the fan motor operating at abnormal low speeds.

Checking Outdoor Unit Electrical Parts

Peak Current-Cut

Diagnosing issues related to peak current cut-offs.

Reset Stop

Troubleshooting steps when the unit stops due to a reset condition.

Checking the Refrigerating Cycle

1. Troubleshooting Procedure (No Operation, No Heating, No Cooling)

Steps to diagnose issues when the unit has no operation, heating, or cooling.

Checking the IPM (Main P.W.B.)

Procedure for checking the IPM on the main P.W.B. as part of cycle diagnosis.

Operating the Outdoor Unit

How to Operate Using the Service Switch

Steps to operate the unit in forced cooling mode using the service switch.

How to Operate the Outdoor Unit Independently

Procedures for independent testing and operation of the outdoor unit.

IPM (Intelligent Power Module) Diagnosis

Circuit Diagram of the Device

Shows the circuit diagram associated with the IPM device.

Circuit Diagram of the Module

Illustrates the internal circuit diagram of the IPM module itself.

Terminals Symbol Mark of the Module

Identifies the terminal markings and symbols on the IPM module.

IPM Diagnosis Procedure

Diagnosis Procedure of IPM Using Multimeter

Detailed steps for using a multimeter to diagnose IPM issues.

Procedure for Disassembly and Reassembly

Indoor Unit

General note indicating the procedure applies to the indoor unit.

1. Front Panel, Air Purifying Unit

Steps for removing the front panel and air purifying unit.

2. Top Grill, Front Cover

Instructions for removing the top grill and front cover components.

Disassembly and Reassembly Procedures

3. Indicating P.W.B. (Display)

Steps for removing the indicating P.W.B. located at the display panel.

4. Control P.W.B.

Instructions for removing the control printed wiring board.

5. Two Way Air Exchange Unit

Steps for removing the two-way air exchange unit.

6. Dew-free Assembly

Procedure for removing the dew-free assembly.

7. Indicating P.W.B. (Switch)

Steps for removing the indicating P.W.B. located at the switch.

8. Cross-flow Fan and Fan Motor

Instructions for removing the cross-flow fan and fan motor assembly.

Disassembly and Reassembly Procedures

1. Electrical Parts (Outdoor Unit)

Steps for removing electrical parts from the outdoor unit.

Removing P.W.B.s (Outdoor Unit)

Steps for removing printed wiring boards from the outdoor unit.

C. Power Factor Improvement Capacitor

Procedure for removing the power factor improvement capacitor.

Parts List and Diagram

Indoor Unit

Lists and diagrams parts specific to the indoor unit.

Indoor Unit Parts List

Indoor Unit Parts List

Parts List and Diagram

Outdoor Unit

Lists and diagrams parts specific to the outdoor unit.

Outdoor Unit Parts List

Parts List and Diagram

Outdoor Unit

Lists and diagrams parts specific to the outdoor unit.

Outdoor Unit Parts List

Outdoor Unit Parts List

Parts List and Diagram

Outdoor Unit

Lists and diagrams parts specific to the outdoor unit.

Indoor Unit Parts List

Indoor Unit Parts List

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