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Hitachi RAK-18QH8SW User Manual

Hitachi RAK-18QH8SW
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NO. 0456E
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT
JUNE 2009
Refrigeration & Air-Conditioning Division
SERVICE MANUAL
PM
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
DC INVERTER (WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ----------------------------------------------------- 4
HOW TO USE ---------------------------------------------------------- 8
CONSTRUCTION AND DIMENSIONAL DIAGRAM ------- 30
MAIN PARTS COMPONENT ------------------------------------- 31
WIRING DIAGRAM -------------------------------------------------- 32
CIRCUIT DIAGRAM ------------------------------------------------- 33
BLOCK DIAGRAM --------------------------------------------------- 37
BASIC MODE --------------------------------------------------------- 39
REFRIGERATING CYCLE DIAGRAM ------------------------- 53
AUTO SWING FUNCTION ---------------------------------------- 55
DESCRIPTION OF MAIN CIRCUIT OPERATION --------- 56
SERVICE CALL Q & A -------------------------------------------- 63
PARTS LIST AND DIAGRAM ------------------------------------ 72
COOLING
HEATING
795
295
198
RAK-50QH8(W)
RAK-50QH8(B)
1 PHASE, 50/60 Hz, 220-240V
REFER TO THE SPECIFICATION (OUTDOOR)
INDOOR UNIT
RAK-25QH8(W)
RAK-25QH8(B)
RAK-35QH8(W)
RAK-35QH8(B)
NOTE:
This manual describes only points that differ from
PM No. 0270E, PM No. 0312E, PM No. 0322E &
PM No. 0371E for items not described in this manual.
9.5
9.5
RAK-18QH8S(W)
RAK-18QH8(W)
RAK-25QH8(W)
RAK-35QH8(W)
RAK-50QH8(W)
RAK-18QH8S(B)
RAK-18QH8(B)
RAK-25QH8(B)
RAK-35QH8(B)
RAK-50QH8(B)
RAK-18QH8S(W)
RAK-18QH8(W)
RAK-25QH8(W)
RAK-35QH8(W)
RAK-50QH8(W)
RAK-18QH8S(B)
RAK-18QH8(B)
RAK-25QH8(B)
RAK-35QH8(B)
RAK-50QH8(B)
RAK-18QH8(W)
RAK-18QH8(B)
9.5 9.5
RAK-18QH8S(W)
RAK-18QH8S(B)
9.5
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Hitachi RAK-18QH8SW Specifications

General IconGeneral
Star Rating3 Star
Cooling Capacity5100 W
TypeSplit AC
RefrigerantR32
Power Supply50 Hz

Summary

SPECIFICATIONS

HOW TO USE

Instructions for operating the air conditioner.

CONSTRUCTION AND DIMENSIONAL DIAGRAM

Detailed diagrams of the indoor unit's physical structure and dimensions.

MAIN PARTS COMPONENT

Identification and specifications of key internal components like thermostat and fan motor.

WIRING DIAGRAM

Schematic showing electrical connections within the indoor unit.

CIRCUIT DIAGRAM

Detailed electrical schematic for the remote control unit.

BLOCK DIAGRAM

Overview of the indoor unit's functional blocks and their interconnections.

BASIC MODE

Explains the fundamental operating modes and their control logic.

REFRIGERATING CYCLE DIAGRAM

Illustrates the refrigerant flow for cooling, dehumidifying, and heating operations.

AUTO SWING FUNCTION

Details on how the auto swing feature operates under different conditions.

DESCRIPTION OF MAIN CIRCUIT OPERATION

Explanation of the indoor unit's power and control circuit operations.

SAFETY DURING REPAIR WORK

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

Guidelines for handling and protecting semiconductor components from damage.

CAUTION

SPECIFICATIONS

Detailed component specifications, including presence of protector, switches, and thermostat.

FEATURES

Highlights new refrigerant R410A and synthetic ester oil, and associated new technology.

REFRIGERANT PIPING MATERIALS

Details on piping thickness, flare expansion, and nut dimensions for R410A.

SERVICING TOOLS

Lists new tools required for R410A refrigerant handling and their differences from HCFC-22 tools.

SWITCH SETTING TO SELECT CAPACITY

Instructions for setting the unit's capacity between 1.8kW and 1.2kW.

SAFETY PRECAUTION

NAMES AND FUNCTIONS OF EACH PART

Identification and description of major indoor unit components like filters, panels, and indicators.

NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT

Details the buttons, display, and functions of the remote control unit.

VARIOUS FUNCTIONS

Explains Auto Restart Control and Automatic Operation modes of the air conditioner.

HEATING OPERATION

Guide on how to operate the unit for heating, including fan speed and temperature settings.

DEHUMIDIFYING OPERATION

Instructions for operating the unit in dehumidifying mode, including temperature and fan speed.

COOLING OPERATION

Guide on how to operate the unit for cooling, including fan speed and temperature settings.

FAN OPERATION

Instructions for using the unit as a fan for air circulation.

HOW TO SET THE TIMER

Steps for setting the OFF-timer, ON-timer, and ON/OFF-timer functions.

HOW TO SET THE SLEEP TIMER

Guide on setting the sleep timer function for automatic adjustment of temperature.

SHIFT VALUE ADJUSTMENT

Process for adjusting shift values on the remote control for fine-tuning operation.

HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER

Instructions for replacing batteries in the remote controller.

THE IDEAL WAYS OF OPERATION

Suitable Room Temperature

Recommendations for optimal room temperature settings for comfort and energy saving.

Install curtain or blinds

Tips on using curtains or blinds to manage heat entering the room.

Ventilation

Advice on maintaining adequate ventilation by occasionally opening doors and windows.

Effective Usage Of Timer

Guidance on using timer functions for comfortable room temperature control, especially at night.

Do Not Forget To Clean The Air Filter

Importance of regular air filter cleaning for efficient operation and energy saving.

Please Adjust Suitable Temperature For Baby And Children

Precautions for setting temperature and airflow for vulnerable individuals like babies and children.

FOR USER'S INFORMATION

The Air Conditioner And The Heat Source In The Room

How room heat sources can affect the air conditioner's ability to reach set temperatures.

Not Operating For A Long Time

Recommendation to switch off the power supply when the unit is not used for extended periods.

When Lightning Occurs

Safety advice to stop operation and unplug the unit during lightning storms.

Interference From Electrical Products

Guidance on maintaining distance from electrical products to avoid noise interference.

MAINTENANCE

ATTACHING THE AIR CLEANSING FILTERS

Step-by-step instructions for installing the air cleansing filters into the unit.

AIR FILTER

Procedure for cleaning the air filter to maintain airflow and cooling efficiency.

Washable Front Panel

Instructions for removing and cleaning the front panel of the indoor unit.

MAINTENANCE AT BEGINNING OF LONG OFF PERIOD

Steps for maintaining the unit before a long period of non-operation.

REGULAR INSPECTION

Checklist for qualified personnel to perform periodic inspections of the unit.

AFTER SALE SERVICE AND WARRANTY

WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS

A guide to common issues and checks when requesting service for the air conditioner.

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MAIN PARTS COMPONENT

Specifications and connection details for Thermostat and Fan Motor components.

WIRING DIAGRAM

Schematic showing electrical connections within the indoor unit.

CIRCUIT DIAGRAM

Detailed electrical schematic for the remote control unit.

BLOCK DIAGRAM

Overview of the indoor unit's functional blocks and their interconnections.

BASIC MODE

Basic Cooling Operation

Detailed timing chart and notes explaining the sequence and conditions of basic cooling operation.

Cooling Sleep Operation

Explanation of the sleep operation mode for cooling, including temperature and fan speed adjustments.

Dehumidifying Sleep Operation

Details on the sleep operation mode for dehumidifying, including temperature and fan speed settings.

Basic Heating Operation

Detailed timing chart and notes explaining the sequence and conditions of basic heating operation.

Reversing Valve Defrosting

Explanation of the defrosting process and inhibit periods during reversing valve operation.

Heating Sleep Operation

Guide to the sleep operation mode for heating, including temperature and fan speed settings.

DESCRIPTION OF MAIN CIRCUIT OPERATION

Reset Circuit

Description and timing chart for the reset circuit that initializes the microcomputer.

Receiver Circuit

Explanation of the light receiver unit's function in processing wireless remote signals.

Buzzer Circuit

Details on the buzzer circuit that provides audible feedback during operation.

Fan Motor Drive Circuit

Explanation of the circuit controlling the indoor fan motor speed and rotation feedback.

Auto sweep motor circuit

Description of the circuit controlling the auto sweep motors for air deflectors.

Room Temperature Thermistor Circuit

Explanation of the circuit that measures room temperature and its voltage output.

Heat exchanger temperature thermistor circuit

Explanation of the circuit measuring heat exchanger temperature for various control functions.

Initial Setting Circuit

Description of the circuit that reads initial settings from E2PROM for compressor and preheating values.

SERVICE CALL Q & A

TROUBLESHOOTING WHEN TIMER LAMP BLINKS

Guide to diagnosing issues based on timer lamp blinking patterns and possible causes.

CHECKING INDOOR UNIT ELECTRICAL PARTS

Flowchart for diagnosing power issues and checking electrical components in the indoor unit.

CHECKING THE REMOTE CONTROLLER

Procedures for troubleshooting and verifying the functionality of the remote controller.

Procedure for Disassembly and Reassembly

PARTS LIST AND DIAGRAM

Illustrated diagram showing the location of various indoor unit parts with corresponding numbers.

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