Hitachi RAS25YH4 User Manual

SM0001
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
DECEMBER
2003
Hitachi Household Appliance (Wuhu) Co., Ltd.
SERVICE MANUAL
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)
RAS25YH4 RAC25YH4
DC INVERTER (WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
780
280
205
9.5
RAS25YH4
RAS35YH4
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 4
HOW TO USE ----------------------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 25
MAIN PARTS COMPONENT --------------------------------------------------- 27
WIRING DIAGRAM ---------------------------------------------------------------- 29
CIRCUIT DIAGRAM --------------------------------------------------------------- 31
PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 37
BLOCK DIAGRAM ----------------------------------------------------------------- 41
BASIC MODE ----------------------------------------------------------------------- 43
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 55
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 56
SERVICE CALL Q & A ---------------------------------------------------------- 84
TROUBLE SHOOTING ----------------------------------------------------------- 87
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY ---------- 113
PARTS LIST AND DIAGRAM ------------------------------------------------ 115
RAS25YH4 / RAC25YH4
RAS35YH4 / RAC35YH4
RAC25YH4
RAC35YH4
COOLING
HEATING
INDOOR UNIT
OUTDOOR UNIT INDOOR UNIT
OUTDOOR UNIT
1 PHASE, 50Hz, 230V
560 (155 ~ 1,080)
2.86
2.50 (0.90 ~ 3.10)
8,530 (3,070 ~ 10,575)
770 (115 ~ 1,120)
3.72
3.40 (0.90 ~ 4.40)
11,601 (3,070 ~ 15,695)
750
548
288
35
780
280
205
9.5
750
548
288
35
1 PHASE, 50Hz, 230V
950 (155 ~ 1,300)
4.35
3.50 (0.90 ~ 4.00)
11,942 (3,070 ~ 13,650)
980 (115 ~ 1,300)
4.49
4.20 (0.90 ~ 5.00)
14,331 (3,070 ~ 17,745)
After installation
RAS35YH4 RAC35YH4
HITACHI
AW NO. 0001
RAS-25YH4/RAC-25YH4
RAS-35YH4/RAC-35YH4
RAS_25_35_AW_000cover 2003.12.31, 10:41 AM1

Hitachi RAS25YH4 Specifications

General

Type	Split System
Cooling Capacity	2.5 kW
Heating Capacity	3.2 kW
Refrigerant	R410A
Power Supply	220-240V, 50Hz
Outdoor Unit Noise Level	50 dB(A)
Indoor Unit Weight	8.5 kg
Outdoor Unit Weight	26 kg
Air Flow (Indoor)	510 m³/h

Summary

Specifications

Model Specific Specifications

Detailed technical specifications for different models.

Safety Precautions

Repair and Semiconductor Handling Safety

Safety guidelines for repair work and handling semiconductors.

Installation, Maintenance, and Operation Safety

Safety measures for installation, unit handling, and operation.

Unit Components and Operation

Component Identification and Functions

Overview of indoor and outdoor unit parts and their functions.

Remote Controller and Operation Modes

How to use the remote controller and various operation modes.

Timer and Sleep Functions

Setting and using timer and sleep functions for operation control.

Maintenance and Technical Diagrams

Routine Maintenance Procedures

Steps for cleaning filters and maintaining unit parts.

Construction and Electrical Diagrams

Dimensional drawings, wiring, circuit, and block diagrams.

Main Component Specifications

Thermostat, Fan Motor, and Compressor Specs

Electrical and operational specifications for key components.

Troubleshooting and Failure Diagnosis

Service Call Q&A and General Troubleshooting

Common issues, answers, and initial troubleshooting steps.

Self-Diagnosis and Indicator Lights

Interpreting indicator lamps for failure codes.

Refrigerating Cycle Diagnosis

Procedures for diagnosing gas leaks and compressor issues.

Electrical System and Repair Procedures

Electrical Parts Checks and Power Circuit

Checking electrical parts and power circuit functions.

Component Diagnosis and Replacement

Diagnosing IPM and procedures for part replacement.