Hitachi RAK-18QXD User Manual

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT
SERVICE MANUAL
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 6
HOW TO USE ---------------------------------------------------------------------- 9
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 29
MAIN PARTS COMPONENT --------------------------------------------------- 30
WIRING DIAGRAM ---------------------------------------------------------------- 31
CIRCUIT DIAGRAM --------------------------------------------------------------- 33
After installation
BLOCK DIAGRAM ----------------------------------------------------------------- 35
BASIC MODE ----------------------------------------------------------------------- 36
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 47
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 51
SERVICE CALL Q & A ---------------------------------------------------------- 61
INDOOR UNIT
INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT
RAK-25R RAC-25W RAK-35R RAC-35W RAK-50R RAC-50W
(KW)
(B.T.U./h)
(KW)
(B.T.U./h)
W
295
210
11
792(+65)
600
299(+27.5)
37.5
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
14,330 (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)
20,470 (7,510
24,910)
6.44-6.16
1,415 (500 2,700)
4.00 (0.90
4.80) 5.80 (2.20 7.00)
XD XD XD XD XD XD
RAK-35RXD
RAK-25RXD
RAK-18QXD
RAK-50RXD
295
210
11
792(+65)
600
299(+27.5)
37.5
900
295
210
11
800(+63)
736
350(+35.5)
51
RAK-35RXD
RAK-50RXD
RAK-18QXD
RAK-25RXD
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY------------- 49
RAK-18QXD RAK-25RXD RAK-35RXD RAK-50RXD
-
RAC-25WXD RAC-35WXD RAC-50WXD
RAM-33NP2B
o o
- -
RAM-40NP2B
o o o
-
RAM-53NP2B
o o o o
RAM-53NP3B
o o o o
RAM-68NP3B
o o o o
RAM-70NP4B
o o o o
RAM-90NP5B
o o o o
RAM-110NP6B
o o o o
Single outdoor unit
Multi
outdoor
unit
Indoor unit
This manual describes only points that differ from
RAC-25WXD,RAC-35WXD,RAC-50WXD（JCH-WH NO.0112E）
for items not described in this manual.
800 (250 1,600)
RAM-33NP2B（PM NO.0581E）
RAM-40NP2B（PM NO.0582E）
RAM-53NP2B,RAM-53NP3B（PM NO.0583E）
RAM-110NP6B
（PM NO.0584E）RAM-68NP3B
（PM NO.0585E）RAM-70NP4B
（PM NO.0586E）RAM-90NP5B
（PM NO.0587E）
PARTS LIST AND DIAGRAM --------------------------------------------------
VARIOUS SETTINGS ----------------------------------------------------------------- 71
900900
NO.0111E
90
JCH-WH
Johnson Controls-Hitachi Air Conditioning Wuhu Co., Ltd.
- 1 -

Hitachi RAK-18QXD Specifications

General

Model	RAK-18QXD
Capacity	1.5 Ton
Star Rating	3 Star
Weight (Outdoor Unit)	34 kg
Outdoor Unit Weight	34 kg
Noise Level (Outdoor Unit)	52 dB
Type	Split Air Conditioner
Cooling Capacity (W)	5050 W
Cooling Capacity (kW)	5.05 kW
Power Supply	220-240V, 50Hz
Power Supply (V, Hz)	220-240V, 50Hz

Summary

Safety and Repair Standards

SAFETY DURING REPAIR WORK

Essential safety guidelines for personnel performing repairs on the unit.

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

Procedures to prevent damage to sensitive electronic components during handling.

Unit Specifications and Operation Modes

SPECIFICATIONS

Technical details and performance data for various models.

NAMES AND FUNCTIONS OF REMOTE CONTROLLER

Explanation of buttons, display elements, and features of the remote control.

HEATING OPERATION

Guidelines for operating the unit in heating mode, including temperature ranges.

DEHUMIDIFYING OPERATION

Instructions for using the unit to reduce indoor humidity effectively.

COOLING OPERATION

Procedures for operating the unit in cooling mode and optimal temperature settings.

ECO OPERATION

Description of the energy-saving function that adjusts settings automatically.

WEEKLY TIMER OPERATION

Programming daily or weekly operating schedules for the air conditioner.

BASIC MODE

Overview of fundamental operating modes and fan speed settings.

Technical Details and Maintenance

NAMES AND FUNCTIONS OF EACH PART

Identification and description of internal and external components of the indoor unit.

MAINTENANCE

Procedures for cleaning air filters and front panels for optimal performance.

CONSTRUCTION AND DIMENSIONAL DIAGRAM

Visual representation of the indoor unit's physical structure and dimensions.

REFRIGERATING CYCLE DIAGRAM

Visual representation of the refrigerant flow during cooling and heating cycles.

Procedure for Disassembly and Reassembly

Step-by-step instructions for safely taking apart and reassembling the indoor unit.

Troubleshooting and Diagnostics

SERVICE CALL Q&A

Common service issues, their causes, and recommended solutions.

Diagnosis and troubleshooting of indoor electric parts

A systematic approach to diagnosing electrical faults within the indoor unit.

1. Failure phenomenon: The power will not become turned on.

Steps to diagnose and resolve issues where the unit fails to power on.

2.Failure phenomenon: The product will not receive a remote control signal.

Troubleshooting steps for issues related to remote control signal reception.

How to identify sources of jamming in the reception of remote control signals

Methods to detect and eliminate external factors interfering with remote control signals.

3. Failure phenomenon: The compressor will not run.

Diagnostic procedures for when the compressor fails to operate.

4. Failure phenomenon: The fan motor will not stop.

Steps to troubleshoot a fan motor that continues to run after being stopped.

12. Timer lamp blinking: blinking 12 times

Troubleshooting guide for a 12-time blinking timer lamp indicating communication errors.

PARTS LIST AND DIAGRAM

Comprehensive list of all parts with corresponding diagrams for identification.