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Mitsubishi Electric MUZ-GL12NA User Manual

Mitsubishi Electric MUZ-GL12NA
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HFC
utilized
R410A
INDOOR UNIT
SERVICE MANUAL
No. OBH733
REVISED EDITION-J
Indoor unit service manual
MSZ-GL•NA, MSY-GL•NA Series (OBH732)
MUZ-GL18/24NA
MUZ-GL18/24NAH
MUY-GL18/24NA
PARTS CATALOG (OBB733)
OBH733 REVISED EDITION-H is void.
Revision J:
A warning when opening or closing the valve has
been added.
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················7
5. WIRING DIAGRAM ·····································9
6. REFRIGERANT SYSTEM DIAGRAM ··········· 21
7. DATA······················································ 24
8. ACTUATOR CONTROL ····························· 39
9. SERVICE FUNCTIONS ······························ 40
10. TROUBLESHOOTING ······························· 41
11. DISASSEMBLY INSTRUCTIONS ················· 65
OUTDOOR UNIT
Models
MUZ-GL09NA
-
U1
,
U2
,
U8
MUZ-GL09NAH
-
U1
,
U2
,
U8
MUY-GL09NA
-
U1
,
U2
MUZ-GL12NA
-
U1
,
U2
MUZ-GL12NAH
-
U1
,
U2
MUY-GL12NA
-
U1
,
U2
MUZ-GL15NA
-
U1
,
U2
MUZ-GL15NAH
-
U1
,
U2
MUY-GL15NA
-
U1
,
U2
MUZ-GL18NA
-
U1
MUZ-GL18NAH
-
U1
MUY-GL18NA
-
U1
MUZ-GL24NA
-
U1
,
U2
MUZ-GL24NAH
-
U1
MUY-GL24NA
-
U1
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Mitsubishi Electric MUZ-GL12NA Specifications

General IconGeneral
Cooling Capacity12, 000 BTU/h
Heating Capacity13, 600 BTU/h
Heating Seasonal Performance Factor (HSPF)10.0
RefrigerantR-410A
Noise Level (Outdoor)49 dB(A)
TypeSplit System Air Conditioner
Power Supply208 / 230V, 1 Phase, 60 Hz
Sound Level (Indoor)19 dB(A)

Summary

1 TECHNICAL CHANGES

Model and Component Updates

Details model variations and component revisions across different units.

2 PART NAMES AND FUNCTIONS

Outdoor Unit Component Identification

Illustrates and names external parts of the outdoor unit.

3 SPECIFICATION

Electrical and Performance Specifications

Details capacity, power, airflow, and refrigerant control parameters.

Physical Dimensions and Refrigerant Details

Lists unit dimensions, weight, piping sizes, and refrigerant charge.

Operating Range and Test Conditions

Power Supply and Operating Range

Specifies guaranteed voltage and operating limits for power supply.

SEER and HSPF Test Conditions

Outlines indoor/outdoor air conditions for performance tests.

4 OUTLINES AND DIMENSIONS

Model Dimensions and Installation Clearances

Provides detailed measurements and installation space requirements for various models.

5 WIRING DIAGRAM

Electrical Schematics for Various Models

Shows the internal electrical connections for various models.

6 REFRIGERANT SYSTEM DIAGRAM

Refrigerant Circuit Layouts and Components

Illustrates the refrigerant flow and key components for different models.

Refrigerant Piping and Charging Data

Max. Piping Length, Height Difference, and Charge Calculation

Specifies max piping, height difference, and refrigerant charge calculation methods.

7 DATA

Cooling Performance Data and Corrections

Lists cooling capacity and correction factors at various conditions.

Capacity Correction Factors

Cooling and Heating Capacity Correction Factors by Piping Length

Provides factors to adjust cooling and heating capacity based on piping length.

Heating Capacity Data

Heating Capacity Performance at Various Conditions

Details heating capacity at different indoor/outdoor temperatures.

7-2. PERFORMANCE CURVE

Cooling Performance Curves

Graphical representation of cooling capacity vs. temperature.

Heating Performance Curves

Heating Performance Curves vs. Temperature

Graphical representation of heating capacity vs. temperature.

7-3. CONDENSING PRESSURE

Cooling Condensing Pressure Charts

Shows condensing pressure variations based on temperatures.

Heating Pressure Charts

Heating Condensing Pressure Charts

Shows pressure variations during heating based on temperatures.

7-4. STANDARD OPERATION DATA

Standard Operation Parameters by Model

Lists key electrical and operational data for various models.

7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY

Inverter Frequency Effects on Capacity and Input

Illustrates how inverter frequency affects capacity and input.

7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION

Test Run Operation Procedure

Guides users on performing test run operations with fixed frequency.

8 ACTUATOR CONTROL

Outdoor Fan Motor and R.V. Coil Control Logic

Explains the control sequence for the outdoor fan motor and R.V. coil.

Sensor to Actuator Mapping for Protection

Details how sensors relate to specific actuators for protection and control.

9 SERVICE FUNCTIONS

Defrost Setting and Pre-Heat Control Configuration

Instructions for adjusting defrost settings and pre-heat control function.

10 TROUBLESHOOTING

Troubleshooting Cautions and Procedures

Important safety warnings and general troubleshooting steps.

10-2. FAILURE MODE RECALL FUNCTION

Failure Mode Recall Function Flowchart and Operation

Visual guide to recall and operate the failure mode recall function.

Detailed Outdoor Unit Failure Mode Recall

Detailed Outdoor Unit Failure Recall Flowchart

Step-by-step process to diagnose outdoor unit specific failures.

Outdoor Unit Failure Mode Recall Table

Table of Outdoor Unit Failure Modes and Remedies

Lists failure codes, symptoms, and corresponding remedies for outdoor units.

10-3. TROUBLESHOOTING CHECK TABLE

Comprehensive Troubleshooting Check Table

Links symptoms, LED indications, and remedies for system failures.

10-4. TROUBLESHOOTING CRITERION OF MAIN PARTS

Main Component Resistance and Check Criteria

Specifies resistance values and checks for key parts like thermistors and compressor.

10-5. TROUBLESHOOTING FLOW

Inverter and Compressor Troubleshooting Flow

Diagnostic steps for inverter and compressor issues.

Compressor Troubleshooting Details

Checking Compressor Winding, Operation, and Start Failure

Procedures to test compressor winding, operation time, and start issues.

Outdoor Thermistor Checks

Checking Outdoor Thermistor Resistance and Operation

Guides for measuring thermistor resistance and verifying unit operation.

R.V. Coil and 4-Way Valve Troubleshooting

Diagnosing R.V. Coil and 4-Way Valve Malfunctions

Steps to check R.V. coil and 4-way valve operation and voltage.

Outdoor Fan Motor Troubleshooting

Checking Outdoor Fan Motor Resistance and Voltage

Procedure to test outdoor fan motor resistance and voltage output.

Power Supply Troubleshooting

Checking Power Supply Voltage and Inverter Board Status

Verifies power supply, AC voltage, DC bus voltage, and LED status.

LEV (Expansion Valve) Troubleshooting

Checking LEV Operation, Vibration, and Coil Characteristics

Guides for verifying LEV click, vibration, coil resistance, and voltage.

Inverter P.C. Board Troubleshooting

Checking Inverter P.C. Board Fuse, Connections, and LED

Steps to check fuse, motor connections, and LED blink codes on the inverter board.

Miswiring and Serial Signal Error Checks

Troubleshooting Miswiring and Serial Signal Errors

Guides for detecting and correcting wiring issues and serial signal errors.

Defrost Heater and Refrigerant Circuit Checks

Checking Defrost Heater and Outdoor Refrigerant Circuit

Verifies defrost heater, thermistors, and refrigerant circuit for proper function.

Electromagnetic Noise Troubleshooting

Identifying and Resolving Electromagnetic Noise Issues

Steps to diagnose and mitigate electromagnetic interference with external devices.

10-6. TEST POINT DIAGRAM AND VOLTAGE

Inverter P.C. Board Test Points and Voltage Checks

Identifies test points and voltage measurements on the inverter board.

11 DISASSEMBLY INSTRUCTIONS

Cabinet Removal Procedure

Step-by-step guide to remove the outer cabinet panels.

Inverter and R.V. Coil Removal

Removing Inverter Assembly and P.C. Board

Instructions for disassembling and removing the inverter system components.

Removing the R.V. Coil

Procedure for detaching the reversing valve coil.

Thermistor and Fan Motor Removal

Removing Temperature Sensors

Steps to remove discharge, defrost, outdoor heat exchanger, and ambient thermistors.

Removing the Outdoor Fan Motor

Instructions for disassembling and removing the outdoor fan motor assembly.

Compressor and 4-Way Valve Removal

Removing Compressor and Associated Piping

Steps to detach and remove the compressor and its connected pipes.

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