Hitachi RAC-35WPC User Manual

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
OUTDOOR UNIT
SERVICE MANUAL
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------------------- 9
MAIN PARTS COMPONENT --------------------------------------------------- 11
WIRING DIAGRAM ---------------------------------------------------------------- 13
After installation
BLOCK DIAGRAM ----------------------------------------------------------------- 16
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 17
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 20
SERVICE CALL Q & A ---------------------------------------------------------- 37
TROUBLE SHOOTING ------------------------------------------------------------41
HHAW
RAC-35WPC
RAC-50WPC
OUTDOOR UNIT
OUTDOOR UNIT
OUTDOOR UNIT
RAC-35W
RAC-50W
(KW)
(B.T.U./h)
(KW)
(B.T.U./h)
W
750(+65)
792(+85)
H
548
600
D
288(+27.5)
299(+47)
MODEL
POWER SOURCE
TOTAL INPUT (W
TOTAL AMPERES (A)
CAPACITY
COOLING
HEATING
TOTAL INPUT (W
TOTAL AMPERES (A)
CAPACITY
1,090 (250
1,460)
DIMENSIONS
(mm)
1,560 (500
2,100)
33
NET WEIGHT (Kg)
TYPE
DC INVERTER
1 PHASE,50Hz ,220-230V
4.87-4.66
1,100 (250
1,700)
5.51-5.27
14,330 (3,070
17,060)
7.30-6.98
3.50 (0.90
4.00)
5.00 (1.90
5.20)
11,940 (3,070
13,650)
17,060 (6,480
17,740)
20,470 (7,510
24,910)
7.93-7.59
1,660 (500
2,750)
4.20 (0.90
5.00)
6.00 (2.20
7.30)
Hitachi Household Appliances(Wuhu) Co., Ltd.
PC
PC
RAC-50WPC
RAC-35WPC
1 PHASE,50Hz ,220-230V
NO.0097E
41
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY-------------19
PARTS LIST AND DIAGRAM
--------------------------------------------------56
1

Hitachi RAC-35WPC Specifications

General

Brand	Hitachi
Model	RAC-35WPC
Category	Air Conditioner
Language	English

Summary

SERVICE MANUAL OVERVIEW

Model Specifications

Details specifications for outdoor units, including power, capacity, dimensions, and weight.

SAFETY DURING REPAIR WORK

WORKING STANDARDS FOR PREVENTING SEMICONDUCTOR DAMAGE

OPERATIONAL CAUTIONS

COMPONENT SPECIFICATIONS

OUTDOOR UNIT INSTALLATION GUIDELINES

Installation Clearances and Pipe Lengths

Details required clearances around the outdoor unit and pipe length limitations for optimal performance.

CONSTRUCTION AND DIMENSIONAL DIAGRAM (RAC-35WPC)

Outdoor Unit Dimensions (RAC-35WPC)

Provides detailed dimensions and mounting hole specifications for the RAC-35WPC outdoor unit.

CONSTRUCTION AND DIMENSIONAL DIAGRAM (RAC-50WPC)

Outdoor Unit Dimensions (RAC-50WPC)

Provides detailed dimensions and mounting hole specifications for the RAC-50WPC outdoor unit.

MAIN PARTS COMPONENT OVERVIEW

Fan Motor and Electric Components

Lists specifications for the fan motor and main electrical components like reactors.

COMPRESSOR MOTOR SPECIFICATIONS

WIRING DIAGRAM

BLOCK DIAGRAM

REFRIGERATING CYCLE DIAGRAM (RAC-35WPC)

Cooling and Heating Cycles (RAC-35WPC)

Illustrates the refrigerant flow for cooling and heating modes for the RAC-35WPC.

REFRIGERATING CYCLE DIAGRAM (RAC-50WPC)

Cooling and Heating Cycles (RAC-50WPC)

Illustrates the refrigerant flow for cooling and heating modes for the RAC-50WPC.

PROCEDURE FOR DISASSEMBLY AND REASSEMBLY

DESCRIPTION OF MAIN CIRCUIT OPERATION

Power Circuit Operation

Explains the function and main parts of the power circuit, including IPM and diode stack.

POWER CIRCUIT (LOW VOLTAGE)

MAIN PARTS AND POWER CIRCUIT CHECKS

REVERSING VALVE CONTROL CIRCUIT

TEMPERATURE DETECTION CIRCUIT

ELECTRIC EXPANSION VALVE CIRCUIT

OUTDOOR DC FAN MOTOR CONTROL CIRCUIT

FAN MOTOR DIAGNOSTICS

POWER CIRCUIT (RAC-50WPC)

MAIN CIRCUIT OPERATION DETAILS

POWER CIRCUIT (LOW VOLTAGE) FOR RAC-50WPC

MAIN PARTS AND POWER CIRCUIT CHECKS (RAC-50WPC)

REVERSING VALVE CONTROL CIRCUIT (RAC-50WPC)

TEMPERATURE DETECTION CIRCUIT (RAC-50WPC)

ELECTRIC EXPANSION VALVE CIRCUIT (RAC-50WPC)

OUTDOOR DC FAN MOTOR CONTROL CIRCUIT (RAC-50WPC)

FAN MOTOR DIAGNOSTICS (RAC-50WPC)

SERVICE CALL Q&A

Cooling Operation Issues

Addresses common questions and solutions for cooling operation problems.

Dehumidification Operation Issues

Addresses common questions and solutions for dehumidification operation.

Heating Operation Issues

Addresses common questions and solutions for heating operation.

Auto-Fresh Defrost Issues

Addresses questions regarding the auto-fresh defrost function.

Automatic Operation Issues

Addresses questions about automatic operation mode and wind speed selection.

COMMON OPERATIONAL ISSUES

Automatic Wind Speed Adjustment

Explains changes in automatic wind speed based on temperature and cold wind prevention.

Startup Noise and Noise Variations

Explains noise during startup and variations due to temperature settings.

Temperature Setting Differences

Discusses discrepancies between temperature setting and actual room temperature.

No Wind After Startup

Explains why there might be no wind immediately after startup.

WIRELESS REMOTE CONTROL FUNCTIONS (PART 1)

Timer Settings and Display Issues

Covers issues with setting timers and the disappearance of time displays.

Timer Reservation and Sleep Timer Conflicts

Addresses problems with timer reservations and setting sleep timers with ON timers.

WIRELESS REMOTE CONTROL FUNCTIONS (PART 2)

Sleep Timer and Operation Mode Limitations

Explains sleep timer behavior and limitations in certain modes.

Temperature Display and Vertical Vane Button

Covers temperature display behavior and the response of the vertical vane button.

TROUBLESHOOTING INSPECTION INSTRUCTIONS

Electrical Parts and Grounding Checks

Provides instructions for checking electrical parts and grounding, including oscilloscope usage warnings.

DISCHARGE PROCEDURE FOR POWER CIRCUIT

OTHER HANDLING INSTRUCTIONS

Connector Detaching and Reattaching Methods

Details methods for detaching and reattaching tab terminals and board connectors safely.

Connector Handling Precautions

Warns against detaching or reattaching connectors while the unit is energized.

TROUBLESHOOTING SUPPORT

Self-Diagnosis Function Overview

Explains the self-diagnosis function, failure mode storage, and detection methods.

SELF-DIAGNOSIS LIGHTING MODE (RAC-35WPC)

Self-Diagnosis Codes and Troubleshooting (RAC-35WPC)

Lists self-diagnosis codes, main check points, and repair methods for RAC-35WPC.

SELF-DIAGNOSIS LIGHTING MODE (RAC-50WPC)

Self-Diagnosis Codes and Troubleshooting (RAC-50WPC)

Lists self-diagnosis codes, main check points, and repair methods for RAC-50WPC.

DIAGNOSIS AND TROUBLESHOOTING OF OUTDOOR ELECTRIC PARTS

Electrical Parts Troubleshooting Flowchart

A flowchart to diagnose issues with outdoor electrical parts based on symptoms.

SELF-DIAGNOSIS FLOWCHART (RAC-35WPC)

SELF-DIAGNOSIS FLOWCHART (RAC-50WPC)

TROUBLESHOOTING BY LD301 BLINKING CODES (PART 1)

Power Supply and Thermistor Errors

Diagnoses issues related to power supply voltage and thermistor abnormalities.

TROUBLESHOOTING BY LD301 BLINKING CODES (PART 2)

Overload, Switchover, and Peak Current Issues

Guides troubleshooting for overload, switchover failures, slow rotation, and peak current.

TROUBLESHOOTING BY LD301 BLINKING CODES (PART 3)

Voltage, Fan Lock, and Fan Stop Errors

Covers troubleshooting for active voltage abnormalities, fan lock, and fan stop conditions.

CHECKING THE REFRIGERATING CYCLE

Gas Leakage and Compressor Defect Diagnosis

Procedure to diagnose gas leakage and compressor defects using self-diagnosis lamp and pressure.

OPERATING THE OUTDOOR UNIT WITH TEST SWITCH

OPERATING THE OUTDOOR UNIT INDEPENDENTLY

Connection Procedure and Refrigerant Charge (RAC-35WPC)

Details connection steps and refrigerant charging for the RAC-35WPC.

Connection Procedure and Refrigerant Charge (RAC-50WPC)

Details connection steps and refrigerant charging for the RAC-50WPC.

OUTDOOR UNIT PARTS LIST AND DIAGRAM (RAC-35WPC)

Component Identification and List (RAC-35WPC)

Illustrates and lists all parts of the RAC-35WPC outdoor unit with their corresponding numbers.

OUTDOOR UNIT PARTS LIST AND DIAGRAM (RAC-50WPC)

Component Identification and List (RAC-50WPC)

Illustrates and lists all parts of the RAC-50WPC outdoor unit with their corresponding numbers.