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Mitsubishi Electric Mr.Slim MUZ-GC50NA - C1 User Manual

Mitsubishi Electric Mr.Slim MUZ-GC50NA - C1
64 pages
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SERVICE MANUAL
CONTENTS
1. PART NAMES AND FUNCTIONS· ···················· 3
2. SPECIFICATION ················································ 4
3. OUTLINES AND DIMENSIONS ························ 8
4. WIRING DIAGRAM ············································ 9
5. REFRIGERANT SYSTEM DIAGRAM ············· 14
6. PERFORMANCE CURVES ····························· 18
7. ACTUATOR CONTROL ··································· 23
8. SERVICE FUNCTIONS ··································· 24
9. TROUBLESHOOTING ····································· 24
10. DISASSEMBLY INSTRUCTIONS ···················· 54
Models
SPLIT-TYPE AIR CONDITIONERS
MUZ-GC25NA -
C1
MUZ-GC35NA -
C1
MUZ-GC35NA -
C2
MUZ-GC50NA -
C1
MUZ-GC50NA -
C2
MUZ-GC60NA -
C1
MUZ-GC60NA -
C2
MUZ-GC71NA -
C1
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH482
REVISED EDITION-C
OUTDOOR UNIT
Indoor unit service manual
MSZ-GC•NA Series (OBH481)
MUZ-GC25/35NA
PARTS CATALOG (OBB482)
Please void OBH482 REVISED EDITION-B.
Revision C:
MUZ-GC35NA -
C2
has been added.

Table of Contents

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Mitsubishi Electric Mr.Slim MUZ-GC50NA - C1 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMr.Slim MUZ-GC50NA - C1
CategoryAir Conditioner
LanguageEnglish

Summary

PART NAMES AND FUNCTIONS

Outdoor Unit Component Identification

Diagrams labeling parts for different models.

SPECIFICATIONS

Electrical and Performance Data

Detailed electrical specs, capacity, and performance metrics.

Main Electric Parts Specifications

Ratings and specifications for key electrical components.

OUTLINES AND DIMENSIONS

Unit Size and Installation Space Requirements

Diagrams showing physical dimensions and required clearance for installation.

WIRING DIAGRAMS

MUZ-GC25/35NA Wiring Schematic

Electrical wiring diagram for specific outdoor unit models.

MUZ-GC50/60/71NA Wiring Schematic

Electrical wiring diagram for specific outdoor unit models.

REFRIGERANT SYSTEM DIAGRAMS

MUZ-GC25/35NA Refrigerant Flow

Diagram illustrating the refrigerant circuit for specific models.

MUZ-GC50NA Refrigerant Flow

Diagram illustrating the refrigerant circuit for specific models.

MUZ-GC60NA Refrigerant Flow

Diagram illustrating the refrigerant circuit for specific models.

MUZ-GC71NA Refrigerant Flow

Diagram illustrating the refrigerant circuit for specific models.

MAXIMUM REFRIGERANT PIPING AND CHARGE

Piping Length and Height Differences

Table outlining maximum refrigerant piping limits and height differences.

Additional Refrigerant Charge Calculation

Guidelines for calculating extra refrigerant charge based on piping length.

PERFORMANCE CURVES

Capacity and Input Curves

Graphs showing cooling capacity and total input at rated frequency.

Compressor Frequency Correction Factors

Charts showing capacity and input correction based on compressor frequency.

Test Run Operation Procedure

Instructions for performing a fixed-frequency test run operation.

Outdoor Low Pressure and Current

Graphs showing outdoor low pressure and unit current under cooling operation.

ACTUATOR CONTROL

Outdoor Fan Motor Control Logic

Description of how the outdoor fan motor operates in relation to the compressor.

Reversing Valve (R.V. Coil) Control

Explanation of the 4-way valve operation during cooling and heating modes.

Sensor and Actuator Relationships

Table mapping sensors to actuators for different model groups.

SERVICE FUNCTIONS

Defrost Setting Adjustment

Procedure for changing the defrost finish temperature setting.

Pre-Heat Control Activation

Method for activating pre-heat control to prevent compressor issues.

TROUBLESHOOTING

General Troubleshooting Precautions

Safety guidelines and initial checks before troubleshooting.

FAILURE MODE RECALL FUNCTION

Indoor/Outdoor Unit Failure Recall Flowchart

Step-by-step guide to recall stored failure information.

Outdoor Unit Failure Recall Flowchart

Detailed flowchart for recalling outdoor unit specific failure modes.

OUTDOOR UNIT FAILURE MODE TABLE

MUZ-GC25/35NA Failure Codes

Table mapping LED indications to failure modes and correspondences.

MUZ-GC50/60/71NA Failure Codes

Table mapping LED indications to failure modes and correspondences.

MUZ-GC50NA-C2 Failure Codes

Table mapping LED indications to failure modes and correspondences.

TROUBLESHOOTING CHECK TABLE

MUZ-GC25/35NA Symptoms and Checks

Table correlating symptoms, LED indications, and troubleshooting steps.

MUZ-GC50/60/71NA Symptoms and Checks

Table correlating symptoms, LED indications, and troubleshooting steps.

MUZ-GC50NA-C2 Symptoms and Checks (1)

Table correlating symptoms, LED indications, and troubleshooting steps.

MUZ-GC50NA-C2 Symptoms and Checks (2)

Table correlating symptoms, LED indications, and troubleshooting steps.

TROUBLE CRITERIA OF MAIN PARTS

MUZ-GC25/35NA Component Checks

Resistance and voltage checks for key components.

MUZ-GC50/60/71NA Component Checks

Resistance and voltage checks for key components.

TROUBLESHOOTING FLOWCHARTS

Inverter and Compressor Troubleshooting

Flowcharts to diagnose inverter and compressor issues.

COMPONENT DIAGNOSTIC PROCEDURES

Open Phase and Compressor Checks

Steps to check for open phase and compressor health.

Compressor Winding and Operation Checks

Procedures for checking compressor winding resistance and operation time.

COMPRESSOR START FAILURE DIAGNOSIS

Compressor Operation Time Analysis

Analyzing compressor stop times due to overcurrent for diagnosis.

Compressor Start Failure Identification

Steps to identify and address compressor start failure.

THERMISTOR AND COIL CHECKS

Outdoor Thermistor Resistance Testing

Procedure to measure resistance of outdoor thermistors for fault diagnosis.

R.V. Coil Functionality Test

Checks for R.V. coil operation in cooling and heating modes.

RV COIL AND 4-WAY VALVE TROUBLESHOOTING

Heating Operation R.V. Coil/Valve Issues

Diagnosing R.V. coil and 4-way valve problems during heating.

Cooling Operation R.V. Coil/Valve Issues

Diagnosing R.V. coil and 4-way valve problems during cooling.

OUTDOOR FAN MOTOR AND WIRING CHECKS

Outdoor Fan Motor Resistance and Voltage Test

Procedures to test fan motor resistance and voltage supply.

POWER SUPPLY AND BOARD CHECKS

Power Supply Voltage Verification

Checking input voltages to various boards and units.

Inverter and Control Board Voltage Checks

Verifying voltages on inverter and indoor electronic control boards.

EXPANSION VALVE (LEV) DIAGNOSIS

LEV Operation and Resistance Checks

Testing LEV operation, vibration, and coil resistance.

LEV Voltage Measurement

Measuring voltage at the LEV connector for proper operation.

INVERTER P.C. BOARD DIAGNOSIS

Inverter Board Fuse and LED Checks

Checking the fuse and LED status on the inverter P.C. board.

MISWIRING AND SERIAL SIGNAL ERROR CHECK

Power Supply and Wiring Verification

Checking power supply, wiring integrity, and serial signal status.

SERIAL SIGNAL AND WIRING ERROR DIAGNOSIS

Power and Serial Signal Checks (MUZ-GC50/60/71NA)

Verifying power and serial signal for specific models.

HIGH PRESSURE SWITCH (HPS) CHECK

HPS Resistance and Protection Test

Testing HPS resistance and verifying protection activation.

ELECTROMAGNETIC NOISE INTERFERENCE

Troubleshooting Electromagnetic Noise

Steps to diagnose and mitigate electromagnetic noise affecting TVs/radios.

TEST POINT DIAGRAMS AND VOLTAGES (Inverter P.C. Board)

MUZ-GC25/35NA Inverter Board Test Points

Diagram showing test points and voltage locations on the inverter board.

TEST POINT DIAGRAMS (MUZ-GC50NA-C2 Inverter P.C. Board)

MUZ-GC50NA-C2 Inverter Board Test Points

Diagram showing test points and voltage locations on the inverter board.

OUTDOOR ELECTRONIC CONTROL P.C. BOARD DIAGNOSTICS

MUZ-GC50/60/71NA Control Board Test Points

Diagram showing test points for thermistors and signals on the control board.

NOISE FILTER P.C. BOARD LAYOUT

MUZ-GC50/60/71NA Noise Filter Board Components

Diagram showing component layout and connections on the noise filter board.

OUTDOOR POWER BOARD LAYOUT

MUZ-GC50/60/71NA Power Board Connections

Diagram showing connections and test points on the outdoor power board.

DISASSEMBLY INSTRUCTIONS

Terminal Detaching Mechanism

Explanation of how to detach terminals with locking mechanisms.

MUZ-GC25/35NA Cabinet and Panel Removal

Step-by-step guide for removing outer panels and cabinets.

COMPONENT REMOVAL PROCEDURES

Inverter Assembly and Board Removal

Steps for removing the inverter assembly and related P.C. boards.

R.V. Coil Removal

Procedure for removing the Reversing Valve coil.

Thermistor Removal

Steps for removing discharge and defrost thermistors.

MAJOR COMPONENT DISASSEMBLY

Outdoor Fan Motor Removal

Instructions for removing the outdoor fan motor assembly.

Compressor and 4-Way Valve Removal

Steps for removing the compressor and the 4-way valve.

MUZ-GC50/60/71NA CABINET AND PANEL REMOVAL

Cabinet and Panel Removal Steps

Detailed steps for disassembling cabinets and panels for specific models.

INVERTER AND POWER BOARD REMOVAL

MUZ-GC50/60/71NA Inverter/Power Board Removal

Procedures for removing inverter and power board assemblies.

MUZ-GC50NA-C2 Inverter Assembly Removal

Steps for removing the inverter assembly for a specific model.

BOARD AND MOTOR COMPONENT REMOVAL

R.V. Coil and Thermistor Removal

Instructions for removing R.V. coil and various thermistors.

Outdoor Fan Motor Removal Procedure

Steps for disconnecting and removing the outdoor fan motor.

COMPRESSOR, 4-WAY VALVE, AND REACTOR REMOVAL

Compressor and 4-Way Valve Detachment

Steps for detaching pipes and removing the compressor and 4-way valve.

Reactor Removal Procedure

Instructions for removing the reactor component.

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