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SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Outdoor unit
[Model Name]
PUZ-M100VKA2
PUZ-M100VKA2-ET
PUZ-M100VKA2-ER
PUZ-M125VKA2
PUZ-M125VKA2-ET
PUZ-M125VKA2-ER
PUZ-M140VKA2
PUZ-M140VKA2-ET
PUZ-M140VKA2-ER
PUZ-M100YKA2
PUZ-M100YKA2-ET
PUZ-M100YKA2-ER
PUZ-M125YKA2
PUZ-M125YKA2-ET
PUZ-M125YKA2-ER
PUZ-M140YKA2
PUZ-M140YKA2-ET
PUZ-M140YKA2-ER
[Service Ref.]
PUZ-M100VKA2.TH
PUZ-M100VKA2-ET.TH
PUZ-M100VKA2-ER.TH
PUZ-M125VKA2.TH
PUZ-M125VKA2-ET.TH
PUZ-M125VKA2-ER.TH
PUZ-M140VKA2.TH
PUZ-M140VKA2-ET.TH
PUZ-M140VKA2-ER.TH
PUZ-M100YKA2.TH
PUZ-M100YKA2-ET.TH
PUZ-M100YKA2-ER.TH
PUZ-M125YKA2.TH
PUZ-M125YKA2-ET.TH
PUZ-M125YKA2-ER.TH
PUZ-M140YKA2.TH
PUZ-M140YKA2-ET.TH
PUZ-M140YKA2-ER.TH
R32
CONTENTS
1. REFERENCE MANUAL ······················· 2
2. SAFETY PRECAUTION ······················· 2
3. SPECIFICATIONS ···························· 13
4. DATA ·············································· 14
5. OUTLINES AND DIMENSIONS ··········· 17
6. WIRING DIAGRAM ··························· 18
7. WIRING SPECIFICATIONS ················ 21
8. REFRIGERANT SYSTEM DIAGRAM ··· 26
9. TROUBLESHOOTING ······················· 28
10. FUNCTION SETTING ························ 74
11. MONITORING THE OPERATION DATA
BY THE REMOTE CONTROLLER ······· 75
12. EASY MAINTENANCE FUNCTION ······ 83
13. DISASSEMBLY PROCEDURE ··········· 85
14. REMOTE CONTROLLER ··················· 91
PARTS CATALOG (OCB773)
September 2021
No.OCH773
Note:
• This service manual
describes technical data
of the outdoor units only.
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Summarization of Contents
REFERENCE MANUAL
INDOOR UNIT SERVICE MANUAL
Details for indoor unit service procedures.
SAFETY PRECAUTIONS
SYMBOLS DISPLAYED ON THE UNIT
Explanation of symbols used on the unit for user guidance.
ALWAYS OBSERVE FOR SAFETY
Critical safety instructions to follow during all operations.
CAUTIONS RELATED TO NEW REFRIGERANT
PREPARATION BEFORE REPAIR SERVICE
Steps to take before commencing repair work on the unit.
PRECAUTIONS DURING REPAIR SERVICE
Safety measures to observe while performing repairs.
CAUTIONS FOR UNITS UTILIZING REFRIGERANT R32
Guidelines for safe operation of units using R32 refrigerant.
WARNING FOR SERVICE
INFORMATION ON SERVICING
Guidelines and requirements for performing service operations.
CAUTIONS FOR SERVICE
Specific precautions to be taken during service and maintenance.
ADDITIONAL REFRIGERANT CHARGE
Procedures and considerations for adding refrigerant.
CAUTIONS FOR UNIT USING R32 REFRIGERANT
INFORMATION ON SERVICING
Guidelines and requirements for performing service operations.
REPAIRS TO SEALED COMPONENTS
Procedures for repairing sealed components safely and effectively.
CAUTIONS FOR UNIT USING R32 REFRIGERANT
DETECTION OF FLAMMABLE REFRIGERANTS
Methods and precautions for detecting flammable refrigerants.
LEAK DETECTION METHODS
Techniques and tools for identifying refrigerant leaks.
REMOVAL AND EVACUATION
Procedures for safely removing and evacuating refrigerant.
CAUTIONS FOR UNIT USING R32 REFRIGERANT
DECOMMISSIONING PROCEDURES
Procedures for safely decommissioning the unit.
REFRIGERANT RECOVERY
Steps for safely recovering refrigerant from the system.
LABELLING REQUIREMENTS
Requirements for proper labeling of equipment.
SERVICE TOOLS
PIPE REUSE FLOWCHART
Visual guide for determining pipe usability and filter dryer necessity.
PRECAUTIONS WHEN REUSING EXISTING REFRIGERANT PIPES
CAUTIONS FOR REFRIGERANT PIPING WORK
Specific work procedures and tool requirements for R32 refrigerant piping.
TOOLS AND MATERIALS FOR R32
Table detailing tool compatibility and requirements for R32 systems.
CHOOSING OUTDOOR UNIT INSTALLATION LOCATION
INSTALLATION AREA REQUIREMENTS (A)
Requirements for securing sufficient installation space.
MINIMUM INSTALLATION AREA
VENTILATION OPEN AREA REQUIREMENTS (C)
Guidelines for creating adequate ventilation openings for safety.
INDOOR UNIT INSTALLATION HEIGHTS
Recommended installation heights for various indoor unit types.
MINIMUM INSTALLATION AREA
FLOOR STANDING UNIT INSTALLATION (CASE 2)
Specific installation area requirements for floor-standing models.
DATA
REFILLING REFRIGERANT CHARGE (R32: KG)
Table detailing refrigerant charge amounts based on piping length.
COMPRESSOR TECHNICAL DATA
Technical data related to the compressor specifications.
OUTLINES AND DIMENSIONS
FREE SPACE REQUIREMENTS
Minimum clearances required around the unit for proper operation and maintenance.
SERVICE SPACE REQUIREMENTS
Minimum space needed for accessing components for service.
FOUNDATION BOLTS AND PIPING DIRECTIONS
Information on mounting and piping connections.
WIRING DIAGRAM
PUZ-M100VKA2 WIRING DIAGRAM
Specific wiring diagram for the PUZ-M100VKA2 model.
WIRING DIAGRAM
PUZ-M125VKA2 WIRING DIAGRAM
Specific wiring diagram for the PUZ-M125VKA2 model.
PUZ-M140VKA2 WIRING DIAGRAM
Specific wiring diagram for the PUZ-M140VKA2 model.
WIRING DIAGRAM
PUZ-M100YKA2 WIRING DIAGRAM
Specific wiring diagram for the PUZ-M100YKA2 model.
PUZ-M125YKA2 WIRING DIAGRAM
Specific wiring diagram for the PUZ-M125YKA2 model.
PUZ-M140YKA2 WIRING DIAGRAM
Specific wiring diagram for the PUZ-M140YKA2 model.
WIRING SPECIFICATIONS
FIELD ELECTRICAL WIRING SPECIFICATIONS
Guidelines for power wiring installations.
SEPARATE INDOOR UNIT/ OUTDOOR UNIT POWER SUPPLIES
1:1 SYSTEM POWER SUPPLY
Power supply wiring for single indoor/outdoor unit systems.
SIMULTANEOUS TWIN/TRIPLE SYSTEM POWER SUPPLIES
Power supply wiring for multi-unit systems.
M-NET WIRING METHOD
POINTS TO NOTE FOR M-NET WIRING
Important considerations for M-NET wiring installations.
EARTHING EXAMPLES FOR M-NET SHIELD WIRE
Correct and incorrect earthing methods for M-NET shield wires.
M-NET WIRING METHOD
M-NET ADDRESS SETTING
How to configure M-NET addresses for outdoor units.
REFRIGERANT ADDRESS SETTING
How to set refrigerant addresses for indoor units.
REGULATIONS IN ADDRESS SETTINGS
Rules and guidelines for setting refrigerant and M-NET addresses.
REFRIGERANT COLLECTING (PUMP DOWN)
OPERATION FROM INDOOR UNIT
How to perform test run using the indoor unit controls.
OPERATION FROM OUTDOOR UNIT
How to perform test run using the outdoor unit controls.
TROUBLESHOOTING
CHECKPOINT UNDER TEST RUN
Pre-test run checks to ensure proper system setup.
ERROR AND DIAGNOSTIC REFERENCES
Guidance on accessing error information, history, and self-diagnosis.
TROUBLESHOOTING
INDOOR UNIT ERROR INDICATIONS
Codes and symptoms indicating errors detected by the indoor unit.
OUTDOOR UNIT ERROR INDICATIONS
Codes and symptoms indicating errors detected by the outdoor unit.
SELF-DIAGNOSIS ACTION TABLE
ABNORMALITIES DETECTED WHEN POWER IS ON
Troubleshooting steps for issues detected with power applied.
SELF-DIAGNOSIS ACTION TABLE
ABNORMALITIES DETECTED DURING OPERATION
Troubleshooting steps for issues occurring during unit operation.
SELF-DIAGNOSIS ACTION TABLE
HIGH PRESSURE AND THERMISTOR ISSUES
Troubleshooting for high pressure, thermistor, and valve faults.
SELF-DIAGNOSIS ACTION TABLE
FAN MOTOR AND POWER MODULE ISSUES
Troubleshooting for fan motor, power module, and thermistor faults.
SELF-DIAGNOSIS ACTION TABLE
VOLTAGE AND CURRENT SENSOR ISSUES
Troubleshooting for voltage, current sensor, and signal errors.
SELF-DIAGNOSIS ACTION TABLE
OVERHEAT PROTECTION AND COMPRESSOR ISSUES
Troubleshooting for overheat protection and compressor faults.
SELF-DIAGNOSIS ACTION TABLE
REMOTE CONTROLLER COMMUNICATION ERRORS
Troubleshooting for remote controller communication faults.
SELF-DIAGNOSIS ACTION TABLE
INDOOR/OUTDOOR COMMUNICATION ERRORS
Troubleshooting for communication errors between indoor and outdoor units.
SELF-DIAGNOSIS ACTION TABLE
MISWIRING AND REFRIGERANT ISSUES
Troubleshooting for miswiring and refrigerant circuit issues.
SELF-DIAGNOSIS ACTION TABLE
M-NET COMMUNICATION AND REFRIGERANT ISSUES
Troubleshooting M-NET communication and refrigerant circuit issues.
SELF-DIAGNOSIS ACTION TABLE
NO ACK SIGNAL AND REFRIGERANT ISSUES
Troubleshooting steps for no ACK signal and refrigerant circuit issues.
SELF-DIAGNOSIS ACTION TABLE
MISWIRING AND REFRIGERANT ISSUES
Troubleshooting steps for miswiring and refrigerant circuit issues.
REMOTE CONTROLLER DIAGNOSIS
DIAGNOSIS FLOW FOR 'PLEASE WAIT' DISPLAY
Steps to diagnose the 'Please Wait' message on the remote controller.
DIAGNOSIS FLOW FOR BLANK REMOTE DISPLAY
Troubleshooting steps for a blank remote controller display.
DIAGNOSIS FLOW FOR REMOTE CONTROLLER ISSUES
Further steps for diagnosing remote controller communication and display problems.
FREQUENT CALLS FROM CUSTOMERS
UNIT NOT OPERATING AT ALL
Troubleshooting steps when the unit fails to start.
REMOTE CONTROLLER ISSUES
Common problems related to remote controller functionality.
INSUFFICIENT COOLING PERFORMANCE
Reasons and solutions for insufficient cooling performance.
FREQUENT CALLS FROM CUSTOMERS
SOUND FROM AIR CONDITIONER
Explanation of normal operating sounds.
BLOWER PERFORMANCE ISSUES
Troubleshooting steps for abnormal blower operation.
AIRFLOW DIRECTION ISSUES
Solutions for problems related to airflow direction control.
FREQUENT CALLS FROM CUSTOMERS
WHITE MIST FROM INDOOR UNIT
Explanation for white mist observed from the indoor unit.
WATER OR MOISTURE FROM OUTDOOR UNIT
Reasons for water or moisture expulsion from the outdoor unit.
REMOTE CONTROLLER DISPLAY ISSUES
Troubleshooting steps for dim or non-functional remote controller displays.
HOW TO CHECK THE PARTS
DC FAN MOTOR AND OUTDOOR CONTROLLER CHECK
Method for checking the DC fan motor and its associated controller board.
HOW TO CHECK THE COMPONENTS
LINEAR EXPANSION VALVE OPERATION
Explanation of the linear expansion valve's operation and control.
HOW TO CHECK THE COMPONENTS
ATTACHING AND DETACHING LINEAR EXPANSION VALVE COIL
Instructions for safely removing and installing the LEV coil.
EMERGENCY OPERATION
EMERGENCY OPERATION CHECK CODES
List of error codes that enable emergency operation.
EMERGENCY OPERATION CAUTIONS
Important warnings and restrictions for emergency operation.
EMERGENCY OPERATION PROCEDURE
Step-by-step guide to initiate emergency operation.
TEST POINT DIAGRAM
OUTDOOR CONTROLLER CIRCUIT BOARD TEST POINTS
Specific test points on the outdoor controller board.
TEST POINT DIAGRAM
OUTDOOR NOISE FILTER CIRCUIT BOARD
Test points and connections for the outdoor noise filter circuit board.
TEST POINT DIAGRAM
OUTDOOR POWER CIRCUIT BOARD TEST POINTS
Test points and connections for the outdoor power circuit board.
TEST POINT DIAGRAM
OUTDOOR POWER CIRCUIT BOARD TEST POINTS
Test points and connections for the outdoor power circuit board.
FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS
FUNCTION OF SWITCHES
Details on the functions of various DIP switches.
FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS
FUNCTION OF SWITCHES (CONTINUED)
Further details on DIP switch functions.
FUNCTION OF CONNECTORS
Explanation of connector functions.
FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS
FUNCTION OF CONNECTORS (CONTINUED)
Further explanation of connector functions.
SPECIAL FUNCTIONS
Special operational features and their configurations.
OUTDOOR UNIT OPERATION MONITOR FUNCTION
MONITORING DISPLAY MODES
Explanation of different display modes for unit status.
NORMAL OPERATION DISPLAY
Indicators for normal unit operation.
ABNORMAL OPERATION INDICATIONS
LED and check code indications for abnormal unit operation.
OUTDOOR UNIT OPERATION MONITOR FUNCTION
ABNORMAL OPERATION INDICATIONS (CONTINUED)
Detailed error codes and their corresponding inspection methods.
OUTDOOR UNIT OPERATION MONITOR FUNCTION
ERROR CODES AND INSPECTION (POWER ON)
Error codes observed when power is initially applied.
ERROR CODES AND INSPECTION (DURING OPERATION)
Error codes observed during normal unit operation.
OUTDOOR UNIT OPERATION MONITOR FUNCTION
OPERATION MODE AND RELAY OUTPUT DISPLAY
Display of operating mode and relay status.
OUTDOOR UNIT OPERATION MONITOR FUNCTION
COMPRESSOR OPERATING FREQUENCY CONTROL STATUS
Indicators for compressor frequency control modes.
FUNCTION SETTING
UNIT FUNCTION SETTING VIA REMOTE CONTROLLER
Procedures for setting unit functions using the remote controller.
SELECTING FUNCTIONS VIA REMOTE CONTROLLER
Steps for selecting and adjusting various unit functions.
MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER
HOW TO MONITOR OPERATION DATA
Guide to accessing and interpreting operational data.
REQUEST CODE LIST FOR OPERATION DATA
List of request codes for retrieving specific operational data.
EASY MAINTENANCE FUNCTION
SMOOTH MAINTENANCE
Features for streamlined maintenance procedures.
PAR-21MAA MAINTENANCE FEATURES
Specific maintenance benefits of the PAR-21MAA model.
EASY MAINTENANCE FUNCTION
GUIDE FOR OPERATION CONDITION
How to interpret operation conditions based on temperature readings.
DISASSEMBLY PROCEDURE
REMOVING SERVICE AND TOP PANELS
How to remove the outer service and top panels.
REMOVING THE FAN MOTOR (MF1)
Procedure for removing the fan motor assembly.
REMOVING THE ELECTRICAL PARTS BOX
Steps for accessing and removing the electrical components enclosure.
DISASSEMBLY PROCEDURE
DISASSEMBLING ELECTRICAL PARTS BOX (VKA2 TYPE)
Detailed steps for disassembling the electrical box for VKA2 models.
DISASSEMBLY PROCEDURE
DISASSEMBLING ELECTRICAL PARTS BOX (YKA2 TYPE)
Detailed steps for disassembling the electrical box for YKA2 models.
REMOVING THE 2-PHASE PIPE THERMISTOR (TH6)
Procedure for removing the 2-phase pipe thermistor.
DISASSEMBLY PROCEDURE
REMOVING THE AMBIENT THERMISTOR (TH7)
Procedure for removing the ambient thermistor.
REMOVING LIQUID, DISCHARGE, AND COMP. SURFACE THERMISTORS
Steps for removing liquid, discharge, and surface thermistors.
DISASSEMBLY PROCEDURE
REMOVING THE LEV COIL
Procedure for removing the linear expansion valve coil.
REMOVING THE LEV
Steps for removing the linear expansion valve assembly.
REMOVING THE HIGH PRESSURE SWITCH (63H)
Procedure for removing the high pressure switch.
DISASSEMBLY PROCEDURE
REMOVING THE 4-WAY VALVE COIL (21S4)
Procedure for removing the 4-way valve coil.
REMOVING THE 4-WAY VALVE
Steps for removing the 4-way valve assembly.
REMOVING THE COMPRESSOR (MC)
Procedure for safely removing the compressor.
REMOTE CONTROLLER
REMOTE CONTROLLER FUNCTIONS (PAR-41MAA)
Explanation of functions available on the PAR-41MAA remote controller.
REMOTE CONTROLLER
FULL DISPLAY MODE
How the remote controller display appears in full mode.
BASIC DISPLAY MODE
How the remote controller display appears in basic mode.
REMOTE CONTROLLER
REMOTE CONTROLLER MENU STRUCTURE
Navigation hierarchy for the remote controller's menu system.
REMOTE CONTROLLER
REMOTE CONTROLLER MENUS AND FUNCTIONS
Overview of available menus and their associated functions.
REMOTE CONTROLLER
MAIN MENU FUNCTIONS LIST
Detailed breakdown of functions available in the main menu.
REMOTE CONTROLLER
INITIAL SETTING FUNCTIONS
Settings configurable during initial setup via remote controller.
DISPLAY SETTING FUNCTIONS
Options for customizing the remote controller display.
OPERATION SETTING FUNCTIONS
Functions related to unit operation control.
MAINTENANCE FUNCTIONS
Functions for unit maintenance and diagnostics.
SERVICE MENU FUNCTIONS
Accessing and using the service menu for advanced settings.
SETTINGS MENU FUNCTIONS
Configuring various unit settings through the remote controller.
CHECK MENU FUNCTIONS
Accessing diagnostic and error information.
OTHER MENU FUNCTIONS
Miscellaneous functions available on the remote controller.
REMOTE CONTROLLER
REMOTE CONTROLLER FUNCTIONS (PAR-SL97A-E)
Explanation of functions for the PAR-SL97A-E remote controller.
REMOTE CONTROLLER OPERATING INSTRUCTIONS
How to operate the PAR-SL97A-E remote controller.
REMOTE CONTROLLER
REMOTE CONTROLLER FUNCTIONS (PAR-SL100A-E)
Explanation of functions for the PAR-SL100A-E remote controller.
ERROR INFORMATION
CHECKING AND RESETTING ERRORS
Procedures for viewing error status and resetting active errors.
ERROR INFORMATION
CHECKING ERROR INFORMATION VIA MAINTENANCE MENU
Accessing error details through the maintenance menu.
SERVICE MENU
MAINTENANCE PASSWORD REQUIREMENT
Information on the password needed to access the service menu.
TEST RUN
TEST RUN OPERATION (PAR-41MAA)
How to conduct a test run using the PAR-41MAA remote controller.
AUTO VANE CHECK
How to check the functionality of the auto vane.
TEST RUN OPERATION (PAR-SL97A-E)
How to conduct a test run using the PAR-SL97A-E remote controller.
TEST RUN OPERATION (PAR-SL100A-E)
How to conduct a test run using the PAR-SL100A-E remote controller.
FUNCTION SETTING
FUNCTION SETTING PROCEDURE (PAR-41MAA)
Step-by-step guide for setting functions using the PAR-41MAA controller.
DISPLAY FORMAT AND SETTING METHOD VARIATIONS
Differences in display and setting methods across indoor units.
FUNCTION SETTING
FUNCTION SETTING PROCEDURE (PAR-SL97A-E)
Guide for setting functions using the PAR-SL97A-E remote controller.
OPERATING INSTRUCTIONS FOR FUNCTION SETTING
Key steps and notes for performing function settings.
FUNCTION SETTING
FUNCTION SETTING PROCEDURE (PAR-SL100A-E)
Guide for setting functions using the PAR-SL100A-E remote controller.
ERROR HISTORY
DELETING ERROR HISTORY
Procedure for clearing recorded error data.
ERROR HISTORY
PRELIMINARY ERROR HISTORY
Accessing and managing preliminary error records.
DELETING PRELIMINARY ERROR HISTORY
Procedure for clearing preliminary error data.
SELF-DIAGNOSIS
SELF-DIAGNOSIS PROCEDURE (PAR-41MAA)
Steps for running self-diagnosis using the PAR-41MAA controller.
RESETTING ERROR HISTORY VIA SELF-DIAGNOSIS
How to reset error history through the self-diagnosis function.
SELF-DIAGNOSIS
MALFUNCTION-DIAGNOSIS METHOD (PAR-SL97A-E)
Procedure for diagnosing malfunctions with the PAR-SL97A-E controller.
MALFUNCTION-DIAGNOSIS METHOD (PAR-SL100A-E)
Procedure for diagnosing malfunctions with the PAR-SL100A-E controller.
REMOTE CONTROLLER CHECK
REMOTE CONTROLLER CHECK PROCEDURE
Steps for performing a remote controller diagnostic check.
SMOOTH MAINTENANCE
SMOOTH MAINTENANCE PROCEDURE (PAR-41MAA)
Step-by-step guide for smooth maintenance using the PAR-41MAA controller.
SETTING ITEMS FOR SMOOTH MAINTENANCE
Configuration options within the smooth maintenance function.
OPERATION DATA DISPLAY
How to view operational data during smooth maintenance.
REQUEST CODE
SETTING REFRIGERANT ADDRESS AND REQUEST CODE
Procedure for setting refrigerant addresses and requesting data.
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