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Hitachi RAC-35WX8 User Manual

Hitachi RAC-35WX8
189 pages
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HHAW
SERVICE MANUAL
TECHNICAL INFORMATION
INFORMATIONS TECHNIQUES
REFER TO THE FOUNDATION MANUAL
REPORTEZ-VOUS AU MANUEL DE BASE
ROOM AIR CONDITIONER
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LES SPECIFICATIONS ET PIECES DETACHEES PEUVENT CHANGER POUR ETRE AMELIOREES.
FOR SERVICE PERSONNEL ONLY
RESERVE AU PERSONNEL
NO. 0015EF
RAS-25WX8 / RAC-25WX8
RAS-35WX8 / RAC-35WX8
RAC-25WX8
RAC-35WX8
SPECIFICATIONS
CARACTERISTIQUES GENERALES
SPECIFICATIONS
CARACTERISTIQUES GENERALES
HOW TO USE
UTILISATION
CONSTRUCTION AND DIMENSIONAL DIAGRAM
DIMENSIONS DES UNITÉS
MAIN PARTS COMPONENT
PRINCIPAUX COMPOSANTS
WIRING DIAGRAM
SCHÉMA ÉLECTRIQUE
WIRING DIAGRAM OF THE PRINTED WIRING BOARD

SCHÉMA ÉLECTRIQUE DU CIRCUIT IMPRIMÉ
BLOCK DIAGRAM
ORGANIGRAMME DE CONTRÔLE
BASIC MODE
MODE DE BASE
REFRIGERATING CYCLE DIAGRAM
SCHÉMA DU CYCLE DE RÉFRIGÉRATION
DISASSEMBLY & ASSEMBLY PROCEDURE
PROCÉDURE D'ASSEMBLAGE ET DESASSEMBLAGE
DESCRIPTION OF MAIN CIRCUIT OPERATION
DESCRIPTION DES PRINCIPAUX CIRCUITS
SERVICE CALL Q&A 
MODE OPERATOIRE DE DEPANNAGE
TROUBLE SHOOTING
DETECTION DES PANNES
PARTS LIST AND DIAGRAM
LISTE DES PIÉCES DE RECHANGE
CONTENTS
TABLE DES MATIERES
INDOOR UNIT + OUTDOOR UNIT
MARCH 2008 Hitachi Appliances, Inc.
9
10
34
38
40
42
47
50
63
65
69
127
135
183
OUTDOOR UNIT
UNITÉ EXTÉRIEURE
INDOOR UNIT
UNITÉ INTÉRIEURE
ĆAfter installation Après installation

RAS-25WX8
RAS-35WX8
RAS-25WX8 RAC-25WX8
EPYTEPYT
MODEL MODÈLE
POWER SOURCE
SOURCE D'ALIMENTATION (PHASE/TENSION/FREQUENCE)
TOTAL INPUT
PUISSANCE ABSORBEE TOTALE (W)
TOTAL AMPERES
)A(XUATOTSEREPMA
CAPACITY CAPACITE
(kW)
(B.T.U./h)
TOTAL INPUT
PUISSANCE ABSORBEE TOTALE (W)
TOTAL AMPERES
)A(XUATOTSEREPMA
CAPACITY CAPACITE
(kW)
(B.T.U./h)
W, L
DIMENSIONS DIMENSIONS (mm) H, H
D, P
)gk(TENSDIOPTHGIEWTEN
DC INVERTER INVERSEUR C.C.
INDOOR UNIT
UNITÉ INTÉRIEURE
OUTDOOR UNIT
UNITÉ EXTÉRIEURE
COOLING
RÉFRIGÉRATION
HEATING
CHAUFFAGE
RAS-35WX8 RAC-35WX8
INDOOR UNIT
UNITÉ INTÉRIEURE
OUTDOOR UNIT
UNITÉ EXTÉRIEURE
1ø, 220V - 230V, 50Hz
580(155-1,290)
3.11-2.97
2.5(0.9-3.1)
8,530(3,070-10,580)
790(115-1,250)
3.99-3.82
3.4(0.9-4.4)
11,600(3,070-15,010)
795 750(+91)
Ć
295 548
198 288(+47)
Ć
9.5 35
4.2˄0.9-5.0˅
14,330˄3,070-17,060˅
980(155-1,460)
4.69-4.49
3.5(0.9-4.0)
11,940(3,070-13,650)
1,010(115-1,440)
4.84-4.63
795
750(+91)
Ć
295
548
198
288(+47)
Ć
9.5
35
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Hitachi RAC-35WX8 Specifications

General IconGeneral
Cooling Capacity3.5 kW
RefrigerantR410A
Power Supply220-240V, 50Hz
Noise Level (Outdoor)50 dB(A)
Weight (Indoor Unit)9 kg
TypeSplit Type

Summary

Safety During Repair Work

General Repair Precautions

Essential safety guidelines for personnel performing repairs.

Semiconductor Handling Safety

Preventing Semiconductor Damage

Standards for safely handling and storing semiconductor parts.

Operational Cautions

General Operating Precautions

Important safety advice for operating the air conditioner under various conditions.

Unit Specifications

General Specifications

Detailed technical specifications for the unit models.

Safety Precautions

Precautions During Installation

Critical safety measures to follow during unit installation.

Part Identification and Functions

Indoor and Outdoor Unit Components

Identification and description of key parts of the indoor and outdoor units.

Remote Controller Functions and Precautions

Details on the remote controller's functions, operation, and handling.

Unit Operation Functions

Automatic Operation Modes

Explanation of automatic operation and auto restart control features.

Heating and Cooling Operations

How to operate the unit in heating and cooling modes.

Dehumidifying Operation

Instructions for using the dehumidifying function of the unit.

Specialized Operation Modes

Airflow and Air Purification Control

How to use fan operation, air purifying, and adjust air deflectors.

Timer Functions

Setting Sleep and On/Off Timers

Step-by-step guide for setting the sleep and on/off timer functions.

Remote Controller and Power

Battery Replacement and Circuit Breaker

Procedures for replacing remote controller batteries and managing the circuit breaker.

Ideal Operation Practices

Room Environment and Filter Maintenance

Tips for optimal room conditions, ventilation, and filter cleaning.

User Information and Environmental Factors

Environmental and Interference Precautions

Information on room heat sources, lightning, and electrical interference.

Maintenance and Cleaning

Air Filter Maintenance

Procedures for cleaning and attaching the air filter for optimal performance.

Panel Cleaning and Long-Term Storage

After-Sales Service and Troubleshooting

Pre-Service Checks and Common Issues

Checklist of points to verify before requesting service for operational problems.

Unit Construction and Dimensions

Indoor Unit Diagram

Detailed dimensional diagram of the indoor unit.

Outdoor Unit Diagram

Detailed dimensional diagram of the outdoor unit.

Component Identification

Thermostat and Fan Motor Components

Identification and specifications of the thermostat and fan motor.

Compressor Specifications

Detailed specifications for the compressor motor.

Wiring and Circuit Diagrams

Indoor and Outdoor Unit Wiring Diagrams

Electrical wiring diagrams for both indoor and outdoor units.

Printed Wiring Board and Remote Control Circuit

Wiring diagram for the printed wiring board and remote control signal path.

System Block Diagrams

Overall System Block Diagram

A high-level overview of the unit's internal system components and their interactions.

Basic Operation Modes

Mode Selection and Fan Speed

Guide to selecting basic operation modes and fan speeds.

Automatic, Heating, and Cooling Modes

Details on automatic, heating, and cooling operation modes.

Dehumidifying, Fan, and Sleep Timer Operations

Instructions for dehumidifying, fan-only, and sleep timer operations.

Operational Mode Details

Cooling Operation Cycle and Condensation Criteria

Explanation of the cooling operation cycle and conditions for condensation.

Defrost and Sleep Operation Cycles

Visual representation of defrost and sleep operation cycles.

Dehumidifying Operation Cycles

Visual representation of dehumidifying and sleep operation cycles.

Heating Operation Details

Heating Sleep and Defrost Operations

Explanation of heating sleep operation and defrosting procedures.

Refrigeration Cycle Diagrams

Cooling and Heating Cycle Schematics

Detailed diagrams illustrating the refrigerant flow in cooling and heating cycles.

Disassembly and Reassembly Procedures

Front Panel and Electrical Box Removal

Step-by-step instructions for disassembling the front panel and electrical box.

Fan Motor and Front Cover Reassembly

Procedures for disassembling the fan motor and reassembling the front cover.

Main Circuit Operation Descriptions

Power Circuit Overview

Explanation of the main power circuit's function and components.

Reset Circuit Functionality

Description of the reset circuit's role in initializing the microcomputer.

Temperature Sensor Circuits

Explanation of room and heat exchanger thermistor circuits and their voltage outputs.

Fan Motor Drive Circuit Operation

Explanation of the fan motor drive circuit and its control mechanism.

Buzzer and Receiver Circuits

Description of the buzzer circuit and the wireless remote signal receiving circuit.

Initial Setting and Temporary Switch Circuits

Explanation of the initial setting circuit and the temporary switch function.

Outdoor Unit Electrical Components

Power and Main Board Overview

Description of the outdoor unit's power and main printed circuit boards.

Outdoor Unit Electrical System Details

Printed Wiring Board (PWB) Composition

Description of the outdoor unit's power and main printed circuit boards.

Detailed Circuit Analysis

Power Circuit Operation and Components

Detailed analysis of the power circuit, including rectification and input current shaping.

Power Circuit Waveforms and Components

Explanation of input current waveforms and components like diodes and inductors.

Power Circuit Filtering and Protection

Description of filtering, surge absorption, and protection circuits in the power supply.

Communication Interface Circuit Analysis

Outdoor to Indoor Communication Signal

Detailed analysis of the signal transmission from outdoor to indoor microcomputers.

Indoor to Outdoor Communication Signal

Detailed analysis of the signal transmission from indoor to outdoor microcomputers.

Indoor/Outdoor Interface Circuit Diagram

Diagram illustrating the interface circuit between indoor and outdoor units.

Communication Protocol Analysis

Serial Communication Data Format

Format of serial communications between indoor and outdoor units.

Parts List and Diagrams

Indoor Unit Parts Identification

Exploded view diagram identifying all parts of the indoor unit.

Parts List Table

A comprehensive list of all parts with their numbers and designations.

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