Hitachi RAC-70DH7 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 RAC-70DH7 Specifications

General

Brand	Hitachi
Model	RAC-70DH7
Category	Air Conditioner
Language	English

Summary

Specifications

Safety Precaution

Precautions During Installation

Essential safety guidelines to follow during the installation process of the unit.

Precautions During Shifting or Maintenance

Safety measures for moving or performing maintenance on the unit.

Precautions During Operation

Important safety instructions for operating the air conditioner correctly and safely.

How to Use the Air Conditioner Effectively

Maintenance

Wiring Diagram

Circuit Diagram

Wired Remote Control

Block Diagram

Refrigerating Cycle Diagram

Description of Main Circuit Operation

Reset Circuit

Room Temperature Thermistor Circuit

Power Circuit

Details on the power circuit, including rectification and voltage boosting.

Indoor/Outdoor Interface Circuit

Explanation of the circuit enabling communication between indoor and outdoor units.

Power Module Circuit

Diagram and explanation of the system power module and its peripheral circuit.

Service Call Q & A

Cooling Mode

Dehumidifying Mode

Heating Mode

Trouble Shooting

Precautions for Checking

Essential safety precautions to be taken before performing any troubleshooting checks.

Troubleshooting When Timer Lamp Blinks

Guide to diagnosing issues based on timer lamp blinking patterns.

Self-Diagnosis Lighting Mode

Explanation of the self-diagnosis system and its indicator lights.

Checking the Indoor/Outdoor Unit Electrical Parts and Refrigerating Cycle

Checking Indoor Unit Electrical Parts

Checking the Outdoor Unit Electrical Parts

Checking the Refrigerating Cycle

Procedure for diagnosing issues related to the unit's refrigerating cycle.

System Power Module Diagnosis

How to Check System Power Module