Hitachi RAD-50DH7A User Manual

NO. 0411E
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
APRIL 2008 Refrigeration & Air-Conditioning Division
SERVICE MANUAL
PM
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
RAD-50DH7A
RAD-60DH7A
RAD-70DH7A
CONTENTS
SPECIFICATIONS ----------------------------------------------------- 4
HOW TO USE ---------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM ------- 23
MAIN PARTS COMPONENT ------------------------------------- 26
WIRING DIAGRAM -------------------------------------------------- 28
CIRCUIT DIAGRAM ------------------------------------------------- 29
BLOCK DIAGRAM --------------------------------------------------- 35
BASIC MODE --------------------------------------------------------- 39
REFRIGERATING CYCLE DIAGRAM ------------------------- 52
DESCRIPTION OF MAIN CIRCUIT OPERATION --------- 54
SERVICE CALL Q & A -------------------------------------------- 80
TROUBLE SHOOTING --------------------------------------------- 83
PARTS LIST AND DIAGRAM ----------------------------------- 103
RAD-50DH7A/RAC-50DH7
RAD-60DH7A/RAC-60DH7
RAD-70DH7A/RAC-70DH7
After installation
RAC-50DH7
RAC-60DH7
RAC-70DH7
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
(DUCTING TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
COOLING
HEATING
OUTDOOR UNIT
RAC-50DH7
INDOOR UNIT
RAD-50DH7A
900
270
720
35
1 Ø, 50 Hz, 220-240V
1,400 (200 ~ 2,100)
6.40 ~ 5.90
5.00 (0.90 ~ 6.00)
17,070 (3,073 ~ 20,490)
1,590 (200 ~ 2,200)
7.30 ~ 6.70
6.00 (0.90 ~ 7.00)
20,490 (3,073 ~ 23,901)
850
800
298
55
900
270
720
35
1 Ø, 50 Hz, 220-240V
1,870 (200 ~ 2,500)
8.55 ~ 7.90
6.00 (0.90 ~ 7.00)
20,490 (3,073 ~ 23,901)
2,130 (200 ~ 2,600)
9.75 ~ 9.00
7.30 (0.90 ~ 8.00)
24,920 (3,073 ~ 27,315)
850
800
298
55
OUTDOOR UNIT
RAC-60DH7
INDOOR UNIT
RAD-60DH7A
OUTDOOR UNIT
RAC-70DH7
INDOOR UNIT
RAD-70DH7A
900
270
720
35
1 Ø, 50 Hz, 220-240V
2,530 (200 ~ 2,920)
11.60 ~ 10.70
7.10 (0.90 ~ 8.00)
24,240 (3,073 ~ 27,310)
2,340 (200 ~ 3,100)
10.70 ~ 9.80
8.00 (0.90 ~ 9.00)
27,310 (3,073 ~ 30,730)
850
800
298
55

Hitachi RAD-50DH7A Specifications

General

Brand	Hitachi
Model	RAD-50DH7A
Category	Air Conditioner
Language	English

Summary

Hitachi Air Conditioner Specifications

Model Specifications

Detailed technical specifications for various Hitachi air conditioner models.

Fan Motor Specifications

Technical details and connection diagram for the fan motor.

Compressor Motor Specifications

Technical data and resistance values for the compressor motor.

Semiconductor Handling Standards

Items to Observe in Handling Semiconductors

Guidelines for safe handling of semiconductors during maintenance and operations.

Operating Precautions and Cautions

General Safety Precautions

Precautions During Installation

Precautions During Shifting or Maintenance

Precautions During Operation

Air Conditioner Functions

Heating Operation Guide

Dehumidifying Operation Guide

Cooling Operation Guide

Timer Reservation Functions

Maintenance Procedures

Air Filter Cleaning

After-Sales Service and Warranty

Service Request Checklist

Points to check before requesting service for operational issues.

Construction and Dimensional Diagrams

Main Component Details

Wiring Diagram

Circuit Diagrams

Wired Remote Control Circuit

Block Diagram

Refrigerating Cycle Diagrams

Main Circuit Operation Descriptions

Overload Control Circuit (OVL)

Temperature Detection Circuits

Electric Expansion Valve Control

Power Circuit Details

Indoor/Outdoor Interface Circuit

Power Module Circuit Analysis

Power Supply Circuit Operation

Rotor Magnetic Pole Detection

Microcomputer Peripheral Circuits

Troubleshooting Common Issues

Checking Precautions

Safety warnings and procedures before checking electrical parts.

Power Circuit Discharge Procedure

Method for safely discharging capacitors in the power circuit.

Timer Lamp Blinking Troubleshooting

Self-Diagnosis Lighting Mode

Interpreting indicator lights for self-diagnosis of unit faults.

Electrical and Refrigerating Cycle Checks

Unit Does Not Operate (with Diagnostics)

Diagnostic steps for when the unit fails to operate.

Indoor Unit Electrical Checks

Power Does Not Come On

Troubleshooting for no power or operation in the indoor unit.

Outdoor Unit Operation Checks

Outdoor Unit Does Not Operate (Receives Signal)

Diagnosing issues when the outdoor unit is unresponsive but receives signals.

Fan Operation Troubleshooting

Indoor Fan Does Not Operate

Troubleshooting steps for when only the indoor fan is not functioning.

All Systems Stop After Start

Diagnosing why all unit systems stop shortly after operation begins.

Main P.W.B. Power Circuit Check

Main P.W.B. (Power Circuit) Checks

Steps to check the main printed wiring board and its power circuit.

Remote Controller Checks

Outdoor Unit Electrical Parts Checks

Power Circuit Phenomena

Rotation Speed Does Not Increase

Troubleshooting for issues with increasing rotation speed.

Refrigerating Cycle Troubleshooting

No Operation Troubleshooting

Procedure for diagnosing gas leaks versus compressor defects.

System Power Module Diagnosis

System Power Module Checking Method

Outdoor Unit Service Operation

Independent Outdoor Unit Operation

Parts List and Diagrams

Indoor Unit Parts List

Exploded view and part number list for the indoor unit.

Outdoor Unit Parts List

Exploded view and part number list for the outdoor unit.