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Hitachi RAS-25CNH1 User Manual

Hitachi RAS-25CNH1
108 pages
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NO. 0164E
SERVICE MANUAL
PM
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
CONTENTS
SPECIFICATIONS --------------------------------------------------------------4
SAFETY PRECAUTION ------------------------------------------------------6
HOW TO USE -------------------------------------------------------------------8
CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------------- 29
MAIN PARTS COMPONENT --------------------------------------------- 30
WIRING DIAGRAM----------------------------------------------------------- 33
CIRCUIT DIAGRAM---------------------------------------------------------- 35
BLOCK DIAGRAM------------------------------------------------------------ 39
BASIC MODE ------------------------------------------------------------------ 41
AUTO SWING FUNCTION------------------------------------------------- 54
DESCRIPTION OF MAIN CIRCUIT OPERATION ------------------ 55
REFRIGERATING CYCLE DIAGRAM ---------------------------------- 86
SERVICE CALL Q & A ----------------------------------------------------- 87
TROUBLE SHOOTING------------------------------------------------------ 91
PARTS LIST AND DIAGRAM------------------------------------------- 113
RAS-25CNH11
RAC-25CNH11
REFER TO THE FOUNDATION MANUAL
INDOOR UNIT
RAS-25CNH11
OUTDOOR UNIT
RAC-25CNH11
WALL TYPE
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
JANUARY 2003
H.A.P.M.
TYPE
MODEL
1ø 220V 50HzPOWER SOURCE
910 (190 ` 1,150) [COOL] / 1,250 (160 ` 1,350) [HEAT]TOTAL INPUT
4.20 ` 3.85 [COOL] / 5.75 ` 5.25 [HEAT]TOTAL AMPERES (RATED / MAX.)
COOLING CAPACITY
HEATING CAPACITY
DIMENSIONS
NET WEIGHT
(W)
(A)
(kW)
(B.T.U./h)
(kW)
(B.T.U./h)
W
H
D
(kg)
(mm)
2.50 (0.90 ` 2.80)
8,870 (3,070 ` 9,550)
3.60 (0.90 ` 4.00)
12,280 (3,070 ` 13,650)
744
248
168
5.5
700
570
210
29
RAS-25CNH11
RAC-25CNH11

Table of Contents

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Hitachi RAS-25CNH1 Specifications

General IconGeneral
Cooling Capacity2.5 kW
Heating Capacity3.2 kW
Energy Efficiency Ratio (EER)3.21
Power Supply220-240V, 50Hz
RefrigerantR410A
Weight (Indoor Unit)8.5 kg
Weight (Outdoor Unit)28 kg
Outdoor Unit Noise Level48 dB(A)
Coefficient of Performance (COP)3.61
TypeSplit System

Summary

SPECIFICATIONS

CONTENTS

Lists the main sections and their corresponding page numbers.

SAFETY DURING REPAIR WORK

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

Items to be observed in handling

Outlines essential precautions for handling electronic components.

CAUTION

SPECIFICATIONS

Figure showing the Installation of Indoor and Outdoor Unit

Dimension of Mounting Stand of the outdoor unit

Provides detailed dimensions for the outdoor unit mounting stand.

Direction of Piping

Explains the allowed directions for piping installation.

SAFETY PRECAUTION

PRECAUTIONS DURING INSTALLATION

Lists warnings and cautions for the installation process.

PRECAUTIONS DURING OPERATION

Lists warnings and cautions for operating the unit safely.

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT PARTS

Details parts and functions of the indoor unit.

OUTDOOR UNIT PARTS

Details parts and functions of the outdoor unit.

REMOTE CONTROL UNIT USAGE

REMOTE CONTROLLER FUNCTIONS

Explains the features and operation of the remote controller.

OPERATION MODES

AUTOMATIC OPERATION

Details the conditions and settings for automatic operation.

HEATING OPERATION

DEHUMIDIFYING OPERATION

Dehumidifying Function Explanation

Describes how the dehumidifying function operates based on temperature.

COOLING OPERATION

FAN OPERATION

FAN SPEED (AUTO)

Explains how AUTO fan speed adjusts during cooling/heating operations.

TIMER SETTING PROCEDURES

OFF-Timer Setting

Explains how to set the timer to turn the unit off.

ON-Timer Setting

Explains how to set the timer to turn the unit on.

SLEEP TIMER SETTING

Sleep Timer Explanation

Explains the sleep timer operation and notes.

ADJUSTING THE AIR DEFLECTOR

CAUTION

Warns about potential condensation issues with the air deflector.

REMOTE CONTROL BATTERY REPLACEMENT

TEMPORARY SWITCH USAGE

Explains the use of the temporary switch for operation.

IDEAL OPERATION PRACTICES

Temperature and Ventilation Advice

Provides warnings and advice on temperature and ventilation.

AIR FILTER MAINTENANCE

AIR FILTER CLEANING PROCEDURE

Details the procedure for cleaning and maintaining the air filter.

Washable Front Panel Cleaning

LONG TERM STORAGE MAINTENANCE

REGULAR INSPECTION CHECKLIST

Lists points for regular inspection by qualified service personnel.

AFTER SALE SERVICE AND WARRANTY

SERVICE CHECKLIST

Lists checks to perform before requesting service.

UNIT CONSTRUCTION AND DIMENSIONS

RAS-25CNH11 DIMENSIONS

Illustrates the construction and dimensions of the indoor unit model.

RAC-25CNH11 DIMENSIONS

Illustrates the construction and dimensions of the outdoor unit model.

MAIN PARTS COMPONENT DETAILS

THERMOSTAT SPECIFICATIONS

Provides thermostat specifications and operating points.

FAN MOTOR SPECIFICATIONS

Provides fan motor specifications, connection, and resistance values.

COMPRESSOR MOTOR SPECIFICATIONS

WIRING DIAGRAM

CIRCUIT DIAGRAMS

RAS-25CNH11 CIRCUIT DIAGRAM

Displays the circuit diagram for the RAS-25CNH11 model.

BLOCK DIAGRAM

SYSTEM OPERATION BLOCK DIAGRAM

Illustrates the overall system operation and component interaction.

BASIC MODE OPERATION

OPERATIONAL DATA TABLES

Lists operational data including mode, temperature, and fan speed parameters.

OPERATION MODE DETAILS

Cooling Operation Details

Describes cooling operation, fan speed, and compressor control.

Dehumidifying Operation Details

Describes dehumidifying operation and fan speed control.

Heating Operation Details

Describes heating operation, fan speed, and compressor control.

BASIC COOLING OPERATION ANALYSIS

COOLING OPERATION DATA TABLES

Lists cooling operation parameters like TCMAX and dewing conditions.

DEHUMIDIFYING AND DEFROST OPERATIONS

Cooling Defrost Process

Explains the cooling defrost operation and its parameters.

COOL RHYTHM OPERATION

Cool Rhythm Operation Notes

Provides important notes regarding the Cool rhythm operation.

Basic heating operation Details

Heating Operation Notes

Provides notes on heating operation, including hot dash and preheating.

Reversing valve defrost Explanation

Defrost Operation Notes

Provides notes on defrost inhibit period, maximum speed, and defrost period.

AUTO SWING FUNCTIONALITY

MAIN CIRCUIT OPERATION DESCRIPTIONS

Reset Circuit Function

Explains the function and operation of the reset circuit.

Receive Circuit Function

Buzzer Circuit Function

Auto Sweep Motor Circuit Function

Auto Sweep Motor Rotation Data

Shows rotation angle and time per step for the auto sweep motor.

Temperature Sensor Circuits

Room Temperature Thermistor Circuit

Explains the room temperature thermistor circuit and voltage output.

Heat Exchanger Thermistor Circuit

Explains the heat exchanger thermistor circuit and its control functions.

Temporary Switch Function

DC Fan Motor Drive Circuit Function

Fan Motor Characteristics

12V Power Circuit Function

Power Circuit Details

Power Circuit References

Provides references for troubleshooting power circuit faults.

Indoor/Outdoor Interface Circuit Explanation

Power Module Circuit Analysis

Power Module Circuit Diagram

Shows the circuit diagram of the power module and its related components.

Power Module Simplified Check

P.W.B. Power Circuit Details

Drive Circuit Analysis

Upper Arm Drive Circuit Diagram

Shows the circuit diagram for the upper arm drive.

Lower Arm Drive Circuit Analysis

Lower Arm Drive Circuit Diagram

Shows the circuit diagram for the lower arm drive.

HIC and Peripheral Circuits Overview

Microcomputer and Peripheral Circuits Diagram

Shows the microcomputer and its peripheral circuits.

Peak Current Cut-off Circuit

Peak Current Cut-off Circuit Diagram

Shows the peak current cut-off circuit and its operational waveforms.

Overload Control Circuit (OVL)

External Overload Judgement Circuit

Explains the external overload judgement circuit.

Voltage Amplifier Circuit Function

Start Current Control

Trip Signal Synthesis Circuit

Trip Signal Transfer Table

Shows circuits to which various modulation signals are transferred.

Temperature Detection Circuits

Temperature Detection Circuit Diagram

Shows the circuit diagram for temperature detection.

Reset Circuit Functionality

Reset Circuit Diagram

Shows the circuit diagram for the reset circuit.

REFRIGERATING CYCLE DIAGRAMS

Cooling Cycle Diagram

Illustrates the refrigerating cycle diagram for cooling operation.

SERVICE CALL Q & A

Cooling Operation Troubleshooting

Addresses common issues and questions during cooling operation.

Dehumidifying Operation Troubleshooting

Addresses common issues and questions during dehumidifying operation.

Heating Operation Troubleshooting

Auto Operation Troubleshooting

Remote Controller and Timer Troubleshooting

GENERAL TROUBLE SHOOTING

PRECAUTIONS FOR CHECKING

Provides essential safety precautions before performing checks.

CAPACITOR DISCHARGE PROCEDURE

ELECTRICAL PARTS DIAGNOSTIC FLOWCHART

Outdoor Unit Electrical Parts Check

Outlines the diagnostic process for electrical parts and the cycle.

INDICATOR LAMP BLINK TROUBLESHOOTING

Outdoor Unit Diagnostics

Refrigerating Cycle Check

Instructs to check the refrigerating cycle for proper operation.

SELF-DIAGNOSIS CODE REFERENCE

Self-Diagnosis Details

Lists self-diagnosis codes and their corresponding details and check points.

Main Check Points

Specifies the main check points for each self-diagnosis code.

Troubleshooting Flowchart: Non-Operation

Outdoor Unit Non-Operation Troubleshooting

Indoor Unit Fan Operation Troubleshooting

Air Deflector Movement Troubleshooting

Unit Stops After Startup Troubleshooting

Remote Control Switch Troubleshooting

Alternative Remote Control Checks

Video Monitor Check Method

Describes how to check the remote using a video monitor.

Checker Device Construction

Explains how to build and use a checker for the remote control.

Overall Air Conditioner Non-Operation Troubleshooting

Outdoor Unit Electrical Parts Check

Outlines the diagnostic process for electrical parts and the cycle.

Power Module Diagnosis Methods

MP 6501 Model Details

Identifies the power module model and its basic structure.

Power Module Circuit Diagrams

Shows circuit diagrams of the power module and its related components.

Power Module Checking Procedure

Power Module Check Caution

Cautions about indicator behavior and connections when checking the power module.

Refrigerating Cycle Checking

Gas Leakage and Compressor Defect Judgment

Details how to judge between gas leakage and compressor defects.

Troubleshooting Procedure: No Operation/Heating/Cooling

Provides a troubleshooting flowchart for non-operation, heating, and cooling issues.

PARTS LISTS AND DIAGRAMS

RAS-25CNH11 Parts List and Diagram

Shows an exploded view diagram of the RAS-25CNH11 model parts.

RAC-25CNH11 Parts List and Diagram

Shows an exploded view diagram of the RAC-25CNH11 model parts.

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