Hitachi RAC-25WXEN User Manual

ROOM AIR CONDITIONER
OUTDOOR UNIT
SERVICE MANUAL
TECHNICAL INFORMATION
SPECIFICATIONS
After installation
OUTDOOR UNIT
Johnson Controls-Hitachi Air Conditioning Wuhu Co., Ltd.
JCH-WH
FOR SERVICE PERSONNEL ONLY
RAC-50WXEN
RAC-25WXEN
RAC-35WXEN
OUTDOOR UNIT OUTDOOR UNIT OUTDOOR UNIT
RAC-25W RAC-35W RAC-50W
(KW)
(B.T.U./h)
(KW)
(B.T.U./h)
W
792(+65)
600
299(+27.5)
38.2
H
D
MODEL
POWER SOURCE
TOTAL INPUT (W)
TOTAL AMPERES (A)
CAPACITY
COOLING
HEATING
TOTAL INPUT (W
TOTAL AMPERES (A)
CAPACITY
814 (250 1,400)
DIMENSIONS
(mm)
1,397 (500 2,100)
593 (250 1,200)
NET WEIGHT (Kg)
TYPE
DC INVERTER
1 PHASE,50Hz,220-230V 1 PHASE,50Hz,220-230V 1 PHASE,50Hz,220-230V
481 (250 1,000)
2.73-2.61
3.20 (0.90 4.20)
10,920 (3,070 14,330)
3.74-3.57
3.67-3.51
13,650 (3,070 16,380)
2.92-2.79
2.50 (0.90 3.10)
8,530 (3,070 10,580)
6.36-6.09
3.50 (0.90 4.00) 5.00 (1.90 5.20)
11,940 (3,070 13,650)
17,060 (6,480 17,740)
6.44-6.16
1,415 (500 2,700)
4.00 (0.90 4.80)
5.80 (2.20 7.00)
XEN XEN XEN
792(+65)
600
299(+27.5)
38.2
800(+63)
736
350(+35.5)
51.7
800 (250 1,600)
RAC-25WXEN
RAC-35WXEN
RAC-50WXEN
19,790 (7,510 23,880)
REFER TO THE FOUNDATION MANUAL
CONTENTS
SPECIFICATIONS ------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM ------------ 9
MAIN PARTS COMPONENT ----------------------------------------- 11
WIRING DIAGRAM ------------------------------------------------------ 13
BLOCK DIAGRAM ------------------------------------------------------- 15
SHEATHED HEATER --------------------------------------------------- 16
REFRIGERATING CYCLE DIAGRAM ------------------------------ 18
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY---- 20
DESCRIPTION OF MAIN CIRCUIT OPERATION --------------- 21
SERVICE CALL Q & A -------------------------------------------------- 31
TROUBLE SHOOTING -------------------------------------------------- 35
PARTS LIST AND DIAGRAM ------------------------------------------ 48
NO.0123E
1

Hitachi RAC-25WXEN Specifications

General

Brand	Hitachi
Model	RAC-25WXEN
Category	Air Conditioner
Language	English

Summary

Air Conditioner Specifications

Outdoor Unit Model Specifications

Details electrical ratings, capacities, and dimensions for RAC-25/35/50WXEN models.

Component Specifications

Lists specifications for components like fan motor, compressor, and fuses for outdoor units.

Safety and Handling Procedures

Repair Work Safety Precautions

Essential safety precautions and procedures for personnel performing repair work.

Semiconductor Handling Guidelines

Guidelines for preventing damage to semiconductors during handling and maintenance.

Operational Cautions

Important cautions regarding operation, noise, power failure, and temperature limits.

Installation and Dimensional Data

Outdoor Unit Installation Diagrams

Illustrates recommended installation clearances and pipe length for outdoor units.

Construction and Dimensions

Detailed dimensions and service space requirements for outdoor units.

Component Details and Diagrams

Main Parts Components

Specifications and details for fan motor and key electric components of the outdoor unit.

Wiring and Block Diagrams

Schematic and functional diagrams showing electrical connections and circuit logic.

Refrigerating Cycle Diagrams

Diagrams illustrating the cooling and heating cycles for the air conditioner.

Operation and Maintenance Procedures

Sheathed Heater Operation

Instructions for setting and operating the sheathed heater.

Disassembly and Reassembly

Step-by-step guide for removing and reinstalling outdoor unit components.

Circuit Operation and Control

Main Circuit Operation Description

Explanation of the power circuit, control circuits, and key component functions.

Reversing Valve Control

Details the control logic and measurement for the 4-way reversing valve.

Electric Expansion Valve and Fan Motor Control

Explains the control of electric expansion valve and outdoor DC fan motor.

Base Heater Circuit Operation

Explains the operation and protection features of the base heater circuit.

Service Call Q&A

Operational Troubleshooting

Addresses common problems in cooling, dehumidification, heating, and defrosting modes.

Remote Control and Common Issues

Covers wireless remote control functions and general operational queries.

Troubleshooting and Diagnostics

Inspection and Safety Procedures

Guides on electrical inspection, safety, and power circuit discharge.

Self-Diagnosis and Troubleshooting Flowcharts

Details self-diagnosis modes, blinking codes, and troubleshooting flowcharts for various failures.

Refrigerating Cycle Troubleshooting

Procedure for diagnosing gas leakage or compressor defects using self-diagnosis.

Specialized Unit Operations

Outdoor Unit Test Switch Operation

Instructions for running the outdoor unit using the test switch for diagnostics.

Independent Outdoor Unit Operation

Guide on how to operate the outdoor unit independently for servicing or testing.

Parts List and Diagrams

Parts for RAC-25/35WXEN Outdoor Units

Illustrated parts list and diagram for RAC-25/35WXEN outdoor units.

Parts for RAC-50WXEN Outdoor Unit

Illustrated parts list and diagram for RAC-50WXEN outdoor unit.