Hitachi RAS-35WX8 - User Manual

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

Hitachi RAS-35WX8 Specifications

General

Cooling Capacity	3.5 kW
Heating Capacity	4.0 kW
Power Supply	220-240V, 50Hz
Refrigerant	R410A
Category	Air Conditioner

Summary

Safety During Repair Work

Working Standards for Preventing Semiconductor Breakage

Specifications

General Specifications

Detailed technical specifications for cooling and heating.

Fan Motor and Compressor Specifications

Specifications for fan motor and compressor components.

Safety Precautions

Precautions During Installation

Guidelines for safe installation of the unit.

Precautions During Operation

Safety guidelines to follow while operating the unit.

Names and Functions of Each Part

Indoor Unit Components

Identification and function of indoor unit parts.

Outdoor Unit Components

Identification and function of outdoor unit parts.

Remote Controller Functions

Various Functions

Automatic Operation

How the unit automatically selects heating or cooling mode.

Heating Operation

Dehumidifying Operation

Cooling Operation

Fan Operation

Adjusting the Air Deflectors

How to Set the Sleep Timer

How to Set the Timer

The Ideal Ways of Operation

Effective Timer Usage

Guidance on using timer functions for comfort.

Maintenance

Air Filter Cleaning and Care

Instructions for cleaning and maintaining the air filter.

Regular Inspection

Names and Functions of Each Part

Indoor Unit Parts and Functions

Identification and description of indoor unit components.

Outdoor Unit Parts and Functions

Identification and description of outdoor unit components.

Automatic Operation

Refrigeration Mode Operation

Fan Operation

How to Set the Timer

Service After Sales and Warranty

Troubleshooting Checklist

Points to check before requesting service.

Construction and Dimensional Diagram

Model RAS-25 WX8, RAS-35 WX8 Dimensions

Dimensional drawings for the indoor unit.

Main Parts Component

Fan Motor

Specifications and wiring for the fan motor.

Wiring Diagram

Indoor Unit Wiring

Electrical wiring schematic for the indoor unit.

Outdoor Unit Wiring

Electrical wiring schematic for the outdoor unit.

Wiring Diagram of the Printed Wiring Board

Block Diagram

Indoor Unit Block Diagram

Functional block diagram of the indoor unit.

Outdoor Unit Block Diagram

Functional block diagram of the outdoor unit.

Basic Mode

Operation Mode Selection

How to select operating modes like Auto, Cooling, Heating.

Timer Functions

Setting and using timer functions.

Basic Cooling Operation

Cooling Sleep Operation

Refrigerating Cycle Diagram

Cooling Cycle Diagram

Diagram illustrating the refrigerant flow during cooling.

Heating Cycle Diagram

Diagram illustrating the refrigerant flow during heating.

Procedure for Disassembly and Reassembly

1. Front Panel Removal and Attachment

Steps for removing and reattaching the front panel.

3. Control Board Assembly

Procedure for accessing and handling the control board.

4. Drain Pan Assembly

5. Fan Motor

6. How to Attach the Front Cover

Description of Main Circuit Operation

1. Power Circuit Operation

Explanation of the indoor unit's power circuit functionality.

2. Reset Circuit

3. Room Temperature Thermistor Circuit

5. Fan Motor Drive Circuit

Waveforms of Fan Motor Signals

Visual representation of fan motor control signals.

7. Receive Circuit

8. Initial Setting Circuit (IC401)

1. The Electrical Parts for the Outdoor Unit

Main P.W.B.

Main printed wiring board functions.

2. Power Circuit

Main parts

Major components of the power circuit.

3. Indoor;Outdoor Interface Circuit

Outdoor to Indoor Communication Signal

Signal transfer from outdoor to indoor microcomputers.

Indoor to Outdoor Communication Signal

Signal transfer from indoor to outdoor microcomputers.

Fig. 2-1 Indoor;outdoor Interface Circuit

Fig. 3-2 Voltages Waveforms of indoor; Outdoor Microcomputers (Outdoor to Indoor Communications)

[Serial Communications Format during Normal Communications]

Outdoor to Indoor Microcomputer Communication

Format for serial communication from outdoor to indoor unit.

Parts List and Diagram

Model RAS-25 WX8, RAS-35 WX8 Parts List

List of all parts for the specified models.

Model RAS-25 WX8, RAS-35 WX8 Parts List Continuation