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Mitsubishi Electric MSZ-HJ25VA-E1 User Manual

Mitsubishi Electric MSZ-HJ25VA-E1
32 pages
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CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. NOISE CRITERIA CURVES ······························ 6
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM ············································ 7
7. REFRIGERANT SYSTEM DIAGRAM ··············· 8
8. SERVICE FUNCTIONS ····································· 9
9. MICROPROCESSOR CONTROL ····················11
10. TROUBLESHOOTING ····································· 15
11. DISASSEMBLY INSTRUCTIONS ···················· 27
MSZ-HJ25VA
-
E1
MSZ-HJ35VA
-
E1
MSZ-HJ50VA
-
E1
Outdoor unit service manual
MUZ-HJ·VA Series (OBH648)
SERVICE MANUAL
No. OBH647
REVISED EDITION-A
INDOOR UNIT
PARTS CATALOG (OBB647)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
SPLIT-TYPE AIR CONDITIONERS
Models
Revision A:
• MSZ-HJ50VA-
E1
has been added.
Please void OBH647.
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Mitsubishi Electric MSZ-HJ25VA-E1 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMSZ-HJ25VA-E1
CategoryAir Conditioner
LanguageEnglish

Summary

General Safety and Preparation

Preparation Before Repair Service

Steps to prepare for air conditioner repair work.

Precautions During Repair Service

Safety measures to follow while performing air conditioner repair.

Technical Changes and Product Information

New Model Introduction

Details the addition of a new model to the product line.

Part Names and Functions Overview

Identifies key components and accessories of the indoor unit.

Product Specifications and Ratings

Provides detailed technical specifications for different models.

Noise Criteria Curves Analysis

Graphs showing sound pressure levels across frequencies for various operating conditions.

Unit Dimensions and Piping Details

Outlines physical measurements and piping connection requirements.

Wiring Diagram and Component Identification

Visual representation of electrical connections and component labels.

Refrigerant System Diagrams

Illustrates refrigerant flow paths in cooling and heating modes for different models.

Service Functions and Operation Control

Timer Short Mode Function

Description of how to shorten the timer delay for service purposes.

Individual Unit Operation Setup

Procedure for modifying PC boards for multiple remote controllers.

Auto Restart Function Management

Explanation of the automatic restart feature and how to disable it.

Wireless Remote Controller Functions

Overview of buttons, signals, and operation states for the remote controller.

Indoor Unit Indicator Lamp States

Explains the meaning of the operation indicator lamp's status.

Cool Operation Mode Details

Steps and features for operating in cool mode, including frost prevention.

Dry Operation Mode Details

Steps and features for operating in dry mode.

Heat Operation Mode Details

Steps and features for operating in heat mode, including cold air prevention.

Auto Vane Operation Modes

Explains horizontal vane control for different operating modes.

Timer Operation (ON/OFF Timer) Guide

Instructions for setting and releasing ON/OFF timers.

Emergency and Test Operation Procedures

Guidelines for using the emergency switch for testing and operation.

3-Minute Time Delay Protection

Explanation of the compressor's 3-minute restart delay function.

Troubleshooting and Diagnostics

General Troubleshooting Cautions

Important safety and procedural notes before starting diagnosis.

Troubleshooting Procedure Steps

General steps for diagnosing unit abnormalities using indicator lamps.

Remote Controller Battery Replacement

Guide on replacing batteries to resolve remote controller malfunctions.

Failure Mode Recall Function Guide

Instructions on how to recall and interpret stored failure codes.

Indoor Unit Failure Mode Table

Correlates indicator lamp patterns to specific indoor unit faults and remedies.

Troubleshooting Flowchart Instructions

Guidance on using flowcharts to diagnose unit issues systematically.

Troubleshooting Check Table

Lists abnormal points, symptoms, conditions, and remedies for unit failures.

Trouble Criterion of Main Parts

Methods and criteria for checking the functionality of key internal components.

Troubleshooting Flow: Indoor Fan Motor

Step-by-step guide to diagnose and resolve indoor fan motor issues.

Troubleshooting: Remote Controller & PC Board

Diagnostic steps for issues related to the remote controller and indoor electronic PC board.

Troubleshooting: Indoor PC Board & Fan Motor

Diagnostic steps for issues involving the indoor PC board and fan motor.

Troubleshooting: Miswiring and Serial Signal

Procedures to check for and resolve miswiring or serial signal communication errors.

Electromagnetic Noise Troubleshooting

Interference Prevention Measures

Steps to mitigate electromagnetic interference with TVs and radios.

Pre-Service Noise Diagnosis

Checks to perform before contacting service for noise issues.

Test Point Diagram and Voltage References

Indoor Power PC Board Test Points

Diagrams showing test points and voltage references on the indoor power PC board.

Indoor Electronic Control PC Board Test Points

Diagrams showing test points and voltage references on the indoor electronic control PC board.

Disassembly Instructions

Terminal Locking Mechanism Removal

Guide on how to detach terminals with locking mechanisms.

Removing the Front Panel

Step-by-step instructions for removing the indoor unit's front panel.

Removing Indoor Power PC Board and Electrical Box

Procedure for safely removing the indoor power PC board and associated electrical box.

Removing Indoor Electronic Control PC Board

Steps for removing the indoor electronic control PC board.

Removing the Vane Motor Assembly

Instructions for disassembling and removing the vane motor unit.

Removing Fan Motor, Coil Thermistor, and Fan

Detailed steps for removing the indoor fan motor, coil thermistor, and line flow fan.

Fixing the Indoor Coil Thermistor

Procedures for correctly mounting and securing the indoor coil thermistor.

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