Table of Contents
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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING
CAPACITY
TOTAL INPUT
TOTAL AMPERES
HEATING
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
FEBRUARY 2008 Hitachi Household Appliances(Wuhu) Co.,Ltd.
RAS-E14H2A
RAC-E14H2
INDOOR UNIT
RAS-E14H2A
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
INDOOR UNIT + OUTDOOR UNIT
RAS-E14H2A/RAC-E14H2
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 4
HOW TO USE ----------------------------------------------------------------------- 5
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 15
MAIN PARTS COMPONENT --------------------------------------------------- 17
WIRING DIAGRAM ---------------------------------------------------------------- 19
CIRCUIT DIAGRAM --------------------------------------------------------------- 20
BLOCK DIAGRAM ----------------------------------------------------------------- 22
BASIC MODE ----------------------------------------------------------------------- 23
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 29
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 30
TROUBLE SHOOTING ----------------------------------------------------------
PARTS LIST AND DIAGRAM ----------------------------------------------- 90
DC INVERTER (WALL TYPE)
1 PHASE, 50 Hz, 220-230V
1,090 (155 ~ 1,460)
5.22-4.99
3.50 (0.90 ~ 4.00)
11,940 (3,070 ~ 13,650)
1,110 (115 ~ 1,440)
5.32-5.09
4.20 (0.90 ~ 5.00)
14,330 (3,070 ~ 17,060)
780
280
210
9.5
SM0027
CONTENTS
-------------------------
OUTDOOR UNIT
RAC-E14H2
750 (+91)
548
288 (+47)
35
After installation
- 61
88
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Table of Contents
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Summarization of Contents
SAFETY PRECAUTION
PRECAUTIONS DURING INSTALLATION
Important safety guidelines for installing the unit to prevent accidents and ensure proper function.
PRECAUTIONS DURING SHIFTING OR MAINTENANCE
Safety measures to take when moving or servicing the air conditioner to avoid electric shock or fire.
HOW TO USE
PRECAUTIONS DURING OPERATION
Safety measures to follow during the normal operation of the air conditioner to prevent hazards.
NAMES AND FUNCTIONS OF EACH PART
INDOOR UNIT
Details and functions of the components within the indoor unit of the air conditioner.
OUTDOOR UNIT
Details and functions of the components within the outdoor unit of the air conditioner.
VARIOUS FUNCTIONS
Auto Restart Control
Functionality that automatically restarts the unit after power failure.
AUTOMATIC OPERATION
Mode where the device automatically determines heating or cooling based on room temperature.
MAINTENANCE
AIR FILTER
Instructions for cleaning the air filter to maintain efficiency and save power.
CLEANING OF FRONT PANEL
Procedure for cleaning the front panel of the indoor unit to keep it tidy.
MAINTENANCE AT BEGINNING OF LONG OFF PERIOD
Steps to take for maintaining the unit during extended periods of non-use.
INFORMATION
CAPABILITIES
Overview of the room air conditioner's heating, cooling, and dehumidifying capabilities.
MAIN PARTS COMPONENT
THERMOSTAT
Specifications and details related to the thermostat component of the unit.
FAN MOTOR
Specifications and connection details for the fan motor.
MAIN ELECTRIC COMPONENTS FOR OUTDOOR UNIT
List of key electrical components found in the outdoor unit.
DESCRIPTION OF MAIN CIRCUIT OPERATION
Reset Circuit
Explanation of the reset circuit's function in initializing the microcomputer program.
DESCRIPTION OF MAIN CIRCUIT OPERATION
Receiver Circuit
Details the circuit responsible for receiving signals from the wireless remote controller.
Buzzer Circuit
Describes the circuit that generates audible feedback signals using a buzzer.
DESCRIPTION OF MAIN CIRCUIT OPERATION
Auto Sweep Motor Circuit
Explains the circuit controlling the auto sweep motor for air deflector movement.
DESCRIPTION OF MAIN CIRCUIT OPERATION
Initial Setting Circuit (IC401)
Details the circuit for initial setup and reading data from non-volatile memory.
Power Supply
Describes the power supply circuit that generates various voltages for the unit's operation.
DESCRIPTION OF MAIN CIRCUIT OPERATION
Fan Motor Drive Circuit
Explains the circuit responsible for controlling the speed and operation of the fan motor.
Serial Communications Format
Outdoor microcomputer to indoor microcomputer
Format for data transmission from the outdoor unit's microcomputer to the indoor unit.
Indoor microcomputer to outdoor microcomputer (HIC)
Format for data transmission from the indoor unit's microcomputer to the outdoor unit.
Communications waveforms
Visual representation of the signal waveforms during indoor and outdoor unit communication.
Serial Communications Data
Outdoor message
Data structure for messages sent from the outdoor unit, including status and sensor readings.
Indoor message
Data structure for messages sent from the indoor unit, including operational status and settings.
IPM (Intelligent Power Module) DIAGNOSIS
IPM drive circuit
Details the circuit within the IPM that drives the IGBTs for compressor control.
Microcomputer's Peripheral Circuits
Overload control circuit (OVL control circuit)
Circuit that protects the compressor and components by reducing speed during overload conditions.
Microcomputer's Peripheral Circuits
Start current control
Manages the initial DC current to ensure smooth compressor startup.
Microcomputer's Peripheral Circuits
Reset Circuit
Initializes the microcomputer program, ensuring proper startup after power cycles.
SERVICE CALL Q & A
COOLING MODE
Frequently asked questions and answers regarding issues encountered during cooling operation.
DEHUMIDIFYING MODE
Questions and answers related to problems during dehumidifying operation of the unit.
HEATING MODE
Common issues and solutions for the heating operation mode of the air conditioner.
SERVICE CALL Q & A
AUTO FRESH DEFROSTING
Explains the process of auto fresh defrosting after heating operation stops.
AUTO OPERATION
Addresses questions about fan speed behavior during automatic operation mode.
NICE TEMPERATURE RESERVATION
Clarifies how the nice temperature reservation function affects operation start times.
INFRARED REMOTE CONTROL
Answers questions related to setting timers and displaying time on the remote control.
SERVICE CALL Q & A
OTHERS
Covers miscellaneous questions about fan speed variations, noises, and operation timing.
TROUBLE SHOOTING
PRECAUTIONS FOR CHECKING
Critical safety warnings and precautions before performing any diagnostic checks on the unit.
Other Cautions
Cautions concerning ICP (IC Protector)
Specific warnings regarding the ICP (IC Protector) and potential failures.
THE SUPPORT FUNCTION OF FAILURE DIAGNOSIS
Self-diagnosis indication function
How the unit indicates failures on the indoor and outdoor sides using lamps and blinking patterns.
CHECKING THE INDOOR UNIT ELECTRICAL PARTS
Power does not come on (no operation)
Step-by-step guide to diagnose and resolve issues when the unit does not power on.
CHECKING THE INDOOR UNIT ELECTRICAL PARTS
Indoor fan does not operate (others are normal)
Troubleshooting steps if the indoor fan fails to operate while other functions are normal.
Air deflector does not move (others are normal)
Diagnostic guide for when the air deflector fails to move, assuming other parts function correctly.
CHECKING THE INDOOR UNIT ELECTRICAL PARTS
Check the control P.W.B. (power circuit)
Procedures to check the control P.W.B. and its power circuit for faults.
PRECAUTIONS FOR SERVICING
Removing the P.W.B.s.
Instructions on how to safely remove the main and power P.W.B.s from the outdoor unit.
PRECAUTIONS FOR SERVICING
Power Factor Improvement capacitor
Steps for replacing the power factor improvement capacitor in the outdoor unit.
HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT
HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY
Procedure for operating the outdoor unit independently for testing and maintenance.
Procedure for Disassembly and Reassembly
1. Front Panel
Step-by-step guide to remove the front panel of the indoor unit for servicing.
2. Front cover
Instructions on how to safely remove the front cover of the indoor unit.
3. Control P.W.B. and Indicating P.W.B.
Procedure for removing the control and indicating P.W.B.s from the indoor unit.
Procedure for Disassembly and Reassembly
4. Tangential air flow fan and fan motor
Steps for removing the fan and fan motor from the indoor unit's tangential airflow system.
1. Electrical parts
Guide to removing electrical components from the outdoor unit casing.
PARTS LIST AND DIAGRAM
INDOOR UNIT MODEL: RAS-E14H2A
Exploded view and parts list for the indoor unit of the RAS-E14H2A model.
PARTS LIST AND DIAGRAM
OUTDOOR UNIT MODEL: RAC-E14H2
Exploded view and parts list for the outdoor unit of the RAC-E14H2 model.
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