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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model Name]
PKA-M35LA2
PKA-M35LA2-ER
PKA-M35LA2-ET
PKA-M50LA2
PKA-M50LA2-ER
PKA-M50LA2-ET
PKA-M35LAL2
PKA-M35LAL2-ER
PKA-M35LAL2-ET
PKA-M50LAL2
PKA-M50LAL2-ER
PKA-M50LAL2-ET
TCH068.indd 1
TCH068.indd 1
[Service Ref.]
PKA-M35LA2.TH
PKA-M35LA2-ER.TH
PKA-M35LA2-ET.TH
PKA-M50LA2.TH
PKA-M50LA2-ER.TH
PKA-M50LA2-ET.TH
PKA-M35LAL2.TH
PKA-M35LAL2-ER.TH
PKA-M35LAL2-ET.TH
PKA-M50LAL2.TH
PKA-M50LAL2-ER.TH
PKA-M50LAL2-ET.TH
INDOOR UNIT
September 2021
R32/R410A
CONTENTS
1. REFERENCE MANUAL ······················· 2
2. SAFETY PRECAUTION ······················· 2
3. PARTS NAMES AND FUNCTIONS ········ 8
4. SPECIFICATIONS ······························ 9
5. NOISE CRITERION CURVES ············· 10
6. OUTLINES AND DIMENSIONS ··········· 11
7. WIRING DIAGRAM ··························· 12
9. TROUBLESHOOTING ······················· 14
10. FUNCTION SETTING ························ 29
11. SPECIAL FUNCTION ························ 30
12. DISASSEMBLY PROCEDURE ············ 32
13. REMOTE CONTROLLER ··················· 36
PARTS CATALOG (TCB068)
No. TCH068
1/10/2564 9:00:26
1/10/2564 9:00:26
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Table of Contents
Related Manuals for Mitsubishi Electric Mr.SLIM PKA-M50LAL2
Summarization of Contents
Reference Manual
Outdoor Unit Service Manuals
Lists service manual and parts catalog numbers for various outdoor unit models.
Safety Precautions
Explains unit symbols, general safety, fire risks, and power disconnection.
New Refrigerant Handling Cautions
Repair Service Preparation and Precautions
Details preparations and precautions during repair service for new refrigerants.
Refrigerant Piping and Component Handling
Cautions regarding refrigerant piping cleanliness, storage, and specific component handling.
Refrigerant Charging and Tool Usage
Guidelines for refrigerant charging, cylinder use, and required tools.
Refrigerant Type and Leak Safety
Stresses using specified refrigerant and ventilating during leaks due to poisonous gas risk.
General Service Warnings and Cautions
Unit Modification and Professional Service
Prohibits unit alteration and advises professional installation/repair by authorized technicians.
Installation Location and Ventilation Safety
Addresses safety regarding installation in small rooms, ventilation, and preventing refrigerant buildup.
Brazing and Storage Safety Guidelines
Details safety measures for brazing work and proper appliance storage conditions.
Service Procedures and Compliance
Covers essential service procedures like refrigerant recovery, filter drier installation, and regulatory compliance.
R32 Refrigerant Servicing Precautions
Work Area Safety and Procedures
Precautions for the work area, general procedures, and personnel safety during servicing.
Fire Safety and Ignition Source Control
Emphasizes presence of fire extinguishers and strict control over ignition sources.
Refrigerant Leak Detection and Ventilation
Details procedures for detecting refrigerant leaks and ensuring adequate ventilation.
Refrigeration Equipment and Electrical Device Checks
Outlines essential checks for refrigeration equipment and electrical components.
Repairing Sealed Components Safety
Provides safety guidelines for repairs on sealed components, including electrical precautions.
R32 Refrigerant Component Handling
Intrinsically Safe Components and Cabling Checks
Safety precautions for intrinsically safe components and checks for cabling integrity.
Flammable Refrigerant Detection and Leak Methods
Prohibits ignition sources for detection and explains leak detection methods.
Refrigerant Removal and Evacuation Procedures
Details the correct procedures for removing and evacuating refrigerant from the system.
Refrigerant Charging Procedures
Outlines specific requirements for charging refrigerant, including contamination prevention.
Refrigerant Handling and Decommissioning
Decommissioning Safety Procedures
Details safety measures and procedures for decommissioning the unit.
Equipment Labelling and Refrigerant Recovery
Guidelines for proper equipment labelling and safe refrigerant recovery practices.
Service Tools and Parts Identification
Exclusive Service Tools for R32/R410A
Lists specialized service tools required for R32/R410A refrigerant systems.
Indoor Unit Components Overview
Identifies and illustrates the main components of the indoor unit.
Indoor Unit Specifications
Technical Data for Indoor Unit
Presents detailed technical specifications for the indoor unit.
Noise Criterion Curves
Sound Level Measurements
Provides sound pressure levels measured in an anechoic room for different fan speeds.
Noise Criterion Curve Analysis
Displays noise criterion curves across various band center frequencies for fan speeds.
Indoor Unit Dimensions and Layout
Installation Space Requirements
Shows the necessary clearances and space required for indoor unit installation.
Piping Hole Cut-out Details
Provides dimensions and details for creating the piping hole cut-out.
Component Views and Dimensions
Illustrates front, bottom, right, left, and top views with dimensions of unit parts.
Wiring Diagram and Self-Diagnosis
Wiring Diagram Notes and Legend
Provides important notes and definitions for symbols used in the wiring diagram.
Self-Diagnosis Functionality
Explains self-diagnosis features and lists check codes with corresponding symptoms.
Refrigerant System Overview
Cooling Mode Refrigerant Flow
Illustrates the path of refrigerant flow during cooling operation.
Heating Mode Refrigerant Flow
Illustrates the path of refrigerant flow during heating operation.
Troubleshooting Guide
Self-Diagnosis Check Code Summary
Provides a summary of self-diagnosis check codes and recommended actions for service.
Remote Controller Malfunction Diagnosis
Indoor Unit Error Codes and Symptoms
Details error codes and symptoms detected by the indoor unit via remote controller.
Other Unit Error Codes and Symptoms
Lists error codes and symptoms detected by units other than the indoor unit.
Remote Diagnosis Notes and Troubleshooting
Diagnosis Notes and Startup Issues
Provides important notes regarding error detection, signal reception, and unit startup.
Post-Test Run Troubleshooting Guidance
Guides users on troubleshooting issues that persist after a test run.
Self-Diagnosis Action Table - Part 1
Thermistor Error Troubleshooting (P1, P2)
Details troubleshooting for room and pipe temperature thermistor errors.
Drain System Error Troubleshooting (P4, P5)
Details troubleshooting for drain float switch and drain pump errors.
Self-Diagnosis Action Table - Part 2
Protection Error Troubleshooting (P6)
Details troubleshooting for freezing/overheating protection errors.
Pipe Temperature Error Troubleshooting (P8)
Details troubleshooting for pipe temperature errors.
Self-Diagnosis Action Table - Part 3
Thermistor and Refrigerant Circuit Errors (P9, PL)
Details troubleshooting for TH5 thermistor and abnormal refrigerant circuit errors.
Communication Error Troubleshooting (E0, E4)
Details troubleshooting for remote controller transmission/signal receiving errors.
Self-Diagnosis Action Table - Part 4
Remote Controller Communication Errors (E3, E5)
Details troubleshooting for remote controller transmission/signal receiving errors.
Indoor/Outdoor Communication Errors (E6, E7)
Details troubleshooting for indoor/outdoor unit communication errors.
Controller Board Errors (Fb, E1, E2)
Details troubleshooting for indoor controller board and remote controller board errors.
Self-Diagnosis Action Table - Part 5
Water Leakage and Fan Motor Errors (PA, Pb)
Details troubleshooting for forced compressor stop due to water leakage and fan motor errors.
Troubleshooting Specific Problems
Indoor Controller Board LED Issues
Provides troubleshooting steps for LED2 status on the indoor controller board (off or blinking).
Troubleshooting Performance Failures
Vane Motor and Receiver Issues
Details troubleshooting for vane performance failures and wireless receiver issues.
Emergency Operation Procedures
Emergency Operation with Controller Failure
Explains emergency operation when wireless remote or unit microprocessor fails.
Starting and Stopping Emergency Operation
Details how to start, stop, and notes for emergency operation modes.
Component Checking Procedures
Checking Thermistors and Motors
Details how to check thermistors (TH1, TH2, TH5) and vane/fan motors (MV, MF).
Thermistor Characteristic Analysis
Presents a graph showing thermistor resistance characteristics versus temperature.
DC Fan Motor Troubleshooting
Checking DC Fan Motor Operation
Provides a step-by-step method for checking the DC fan motor and its circuit board.
Fan Motor Rotation and Stopping Issues
Guides troubleshooting when the indoor fan motor fails to rotate or stop correctly.
Indoor Controller Board Test Points
Indoor Controller Board Diagram
Shows a diagram of the indoor controller board with test points and connector labels.
DIP Switch and Jumper Wire Functions
Board Configuration Settings
Explains how DIP switches and jumper wires control board functions like model and capacity settings.
Function Setting via Remote Controller
Remote Controller Function Configuration
Details how to set unit functions using the remote controller for different unit numbers.
Special Functions Overview
Rotation and Back-up Functionality
Explains rotation, back-up, and system constraints for multi-unit systems.
2nd Stage Cut-in Function Details
Explains the 2nd stage cut-in function for supplemental cooling/heating.
2nd Stage Cut-in Function Constraint
Cooling Mode Availability
Specifies that the 2nd stage cut-in function is only available in cooling mode.
Disassembly Procedures - Initial Steps
Power Off and Panel Removal
Emphasizes powering off the unit and provides instructions for removing the front panel.
Electrical Box Removal
Details the procedure for removing the electrical box and its cover.
Disassembly Procedures - Board and Motor Removal
Controller Board and LED Board Removal
Provides instructions for removing the indoor controller board, wireless remote board, and LED board.
Nozzle Assembly and Vane Motor Removal
Details the procedure for removing the nozzle assembly, vane motor, and drain hose.
Disassembly Procedures - Fan and Thermistor Removal
Indoor Fan Motor and Line Flow Fan Removal
Details the procedure for removing the indoor fan motor and the line flow fan.
Pipe and Evaporator Thermistor Removal
Provides instructions for removing the pipe temperature and condenser/evaporator thermistors.
Disassembly Procedures - Heat Exchanger and Thermistor Removal
Heat Exchanger Removal Process
Details the procedure for removing the heat exchanger.
Room Temperature Thermistor Removal
Provides instructions for removing the room temperature thermistor.
Remote Controller Functions - PAR-41MAA
Controller Interface and Button Functions
Shows the controller layout and explains the functions of various buttons.
Display Indicators and Modes
Explains the status indicators like ON/OFF lamp and the purpose of function buttons.
Remote Controller Display Information
Display Modes and Icons Explained
Explains the different display modes (Full/Basic) and various icons shown on the remote controller.
Central Control and Error Indicators
Indicates centrally controlled operations and preliminary error displays.
Remote Controller Menu Navigation
Main Menu Structure Overview
Provides an overview of the main menu structure for navigating settings.
Operation and Timer Settings Menu
Lists settings related to unit operation, timers, and energy saving.
Initial, Display, and Operation Settings
Covers settings for initial setup, display appearance, and operation modes.
Service and Maintenance Menu Options
Maintenance and Cleaning Functions
Lists options for maintenance, including error information, filter status, and cleaning.
Service Test Run and Input Information
Provides access to service functions like test runs and inputting maintenance information.
Settings, Check, and Other Functions
Covers settings, check functions (history, diagnosis), and other options.
Remote Controller Function Settings - Detailed
Operation and Timer Function Details
Explains operation settings like vane, i-See sensor, high power, and timer functions.
Energy Saving Function Details
Covers energy saving settings: Restriction, Operation lock, Auto return, Schedule, and Energy data.
Remote Controller Menu Functions Summary
Initial, Display, and Operation Settings
Covers initial settings, display settings, and operation settings.
Maintenance, Service, and Check Functions
Covers maintenance, service, and check functions like error history and diagnosis.
Other Menu Options
Covers other functions: Maintenance password, Initialize remote controller, Remote controller information.
Remote Controller - PAR-SL97A-E Interface
Controller Layout and Display Elements
Shows the controller layout and explains the display elements and indicators.
Button Functions Overview
Explains the functions of various buttons like ON/OFF, Temperature, Fan Speed, Mode, and Timer.
Remote Controller - PAR-SL101A-E Interface
Display Indicators and Settings
Shows the display indicators for operation modes, temperature, fan speed, and vane settings.
3D i-See Sensor Functionality
Explains the 3D i-See sensor for air distribution and its settings.
Error Information Display and Reset
Viewing Error Details and Navigation
Describes the screen that appears when an error occurs, showing details and how to navigate.
Error Reset Procedure
Explains how to reset the currently occurring error using specific buttons.
Checking Error Information Status
Accessing Error Information via Maintenance Menu
Explains how to view error information from the Maintenance menu when no errors are active.
Service Menu Access and Password
Accessing the Service Menu
Instructs on selecting 'Service' from the main menu and entering the maintenance password.
Service Menu Options and Notes
Lists available Service menu options and notes regarding unit stoppage and central control limitations.
Test Run Procedure - PAR-41MAA
Initiating Test Run Operation
Details how to select and initiate the test run from the Service menu.
Checking Cooling, Heating, and Vane Functions
Explains how to check cooling, heating, and auto vane functions during a test run.
Test Run Procedures for Other Models
Test Run for PAR-SL97A-E
Details the test run procedure for the PAR-SL97A-E remote controller.
Test Run for PAR-SL101A-E
Details the test run procedure for the PAR-SL101A-E remote controller.
Function Setting - PAR-41MAA
Setting Unit Addresses and Functions
Details setting refrigerant addresses and unit numbers for function configuration.
Mode and Setting Number Configuration
Guides on selecting and changing mode and setting numbers for functions.
Function Setting - Pattern Variations
Navigating and Confirming Function Settings
Explains navigating through pages, selecting numbers, and sending settings.
Function Setting Notes and Documentation
Provides notes on referencing tables and manuals for detailed function settings and documentation.
Function Setting - PAR-SL97A-E Wireless
Wireless Function Selection Procedure
Illustrates the step-by-step flow for selecting functions using the wireless remote.
Operating Instructions for Function Selection
Provides operating instructions for function selection, including unit number and mode selection.
Function Setting - PAR-SL101A-E Wireless
Wireless Function Selection Steps
Details how to enter function select mode, set unit number, mode, and setting number.
Completing Function Selection and Documentation
Instructs on completing function selection and advises documenting changed settings.
Rotation Setting Configuration
Rotation and Support Function Setup
Guides on setting rotation function, period, backup, and support functions via wired remote.
Updating Settings and Reset Method
Instructs on updating settings and explains the reset method for rotation function operation time.
Error History Management
Accessing and Viewing Error History
Details how to access and view error history records from the Service menu.
Deleting Error History Records
Details the procedure for deleting error history records.
Preliminary Error History Management
Accessing and Deleting Preliminary Error History
Explains how to view and delete preliminary error history records.
Self-Diagnosis Procedure - PAR-41MAA
Initiating Self-Diagnosis and Checking Results
Details initiating self-diagnosis, entering refrigerant address, and checking results.
Resetting Error History in Self-Diagnosis
Details the procedure for resetting error history within the self-diagnosis function.
Malfunction Diagnosis Procedures
Self-Diagnosis for PAR-SL97A-E
Details the malfunction diagnosis procedure for the PAR-SL97A-E remote controller.
Self-Check for PAR-SL101A-E
Details the self-check procedure for the PAR-SL101A-E remote controller.
Remote Controller Diagnosis Function
Initiating Remote Controller Check
Details initiating the remote controller check from the Service menu.
Interpreting Remote Controller Check Results
Explains how to interpret the results of the remote controller check (OK, E3, NG, ERC).
Smooth Maintenance Function
Accessing and Setting Smooth Maintenance
Details accessing and setting smooth maintenance parameters like reference address and stable mode.
Viewing Operation Data
Explains that operation data like run time and frequency will be displayed.
Request Code for Operation Data
Accessing Request Code Function
Details accessing the request code function from the Service menu.
Setting Refrigerant Address and Request Code
Details how to set the refrigerant address and request code to retrieve operation data.
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