Table of Contents
Advertisement
Advertisement
Table of Contents
Troubleshooting
Related Manuals for Mitsubishi SRK25ZSX-W
Summarization of Contents
INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS
TECHNICAL MANUAL
Main document title indicating the type of manual.
EXTERIOR DIMENSIONS
Indoor units
Dimensions and specifications for indoor units of the air conditioner.
Outdoor units
Dimensions and specifications for outdoor units of the air conditioner.
Remote control
Information on remote control units for the air conditioner.
Wired remote control (option parts)
Information on optional wired remote control components and installation.
ELECTRICAL WIRING
Indoor units
Electrical wiring diagrams and specifications for indoor units.
Outdoor units
Electrical wiring diagrams and specifications for outdoor units.
NOISE LEVEL
Sound power level
Sound power level data for indoor and outdoor units across frequencies.
Sound pressure level
Sound pressure level data for indoor and outdoor units across frequencies.
PIPING SYSTEM
Models SRK20ZSX-W, 25ZSX-W, 35ZSX-W
Piping system diagrams for specific models of the air conditioner.
Models SRK50ZSX-W, 60ZSX-W
Piping system diagrams for specific models of the air conditioner.
RANGE OF USAGE & LIMITATIONS
Selection chart
Charts for selecting operation ranges and correcting capacity based on conditions.
Correction of cooling and heating capacity in relation to one way length of refrigerant piping
How to adjust cooling/heating capacity based on refrigerant piping length.
Correction relative to frosting on outdoor heat exchanger during heating
Adjusting heating capacity based on outdoor heat exchanger frosting.
CAPACITY TABLES
Model SRK20ZSX-W, -WB, -WT
Cooling and heating capacity tables for specific models.
Model SRK25ZSX-W, -WB, -WT
Cooling and heating capacity tables for specific models.
Model SRK35ZSX-W, -WB, -WT
Cooling and heating capacity tables for specific models.
APPLICATION DATA
Installation of indoor unit
Guidelines and procedures for installing the indoor unit of the air conditioner.
Installation of outdoor unit
Guidelines and procedures for installing the outdoor unit of the air conditioner.
OUTDOOR UNIT INSTALLATION
Haulage
Safety precautions and methods for safely lifting and moving the outdoor unit.
Selecting the installation location
Guidelines for choosing an appropriate and safe installation location for the unit.
Installation space
Recommended clearance and space requirements around the outdoor unit.
Drain piping work (If necessary)
Steps for correctly installing the drain elbow and grommet.
Installation
Instructions for mounting the outdoor unit on a level base with anchor bolts.
CONNECTING PIPING WORK
Restrictions on unit installation
Key restrictions for unit installation to prevent compressor or performance issues.
Piping work
Instructions for flaring pipes and connecting them securely with specified torque.
Evacuation
Detailed steps for evacuating the refrigerant system using a vacuum pump.
Safety precautions in handling air-conditioners with flammable refrigerants
General
General safety and installation requirements for handling flammable refrigerants.
Unventilated areas
Safety considerations for installing units in unventilated spaces.
Qualification of worker
Requirements for qualified personnel performing servicing operations.
Information on servicing
Specific checks and procedures required for servicing systems with flammable refrigerants.
Checks to the area
Safety checks related to the installation area and potential ignition sources.
Work procedure
Controlled procedures to minimize risks when working with flammable refrigerants.
General work area
Safety measures for the work area, including confined spaces and flammable materials.
Checking for presence of refrigerant
Procedures for detecting flammable refrigerants using appropriate equipment.
Presence of fire extinguisher
Requirement for fire extinguishing equipment during hot work.
No ignition sources
Strict prohibition of ignition sources near refrigeration systems.
Ventilated area
Ensuring adequate ventilation before and during system work.
Checks to the refrigeration equipment
Checks on refrigeration equipment components and adherence to guidelines.
Checks to electrical devices
Safety checks for electrical devices, including capacitors and earth bonding.
Repairs to sealed components
Procedures for safely repairing sealed components after disconnecting power.
Repair to intrinsically safe components
Guidelines for working on intrinsically safe components in flammable atmospheres.
Cabling
Checks for cabling condition, considering wear, corrosion, and vibration.
Detection of flammable refrigerants
Strict prohibition of ignition sources during refrigerant leak detection.
Leak detection methods
Acceptable methods for detecting refrigerant leaks, including electronic detectors.
Removal and evacuation
Procedures for safely removing and evacuating refrigerant from the system.
Charging procedures
Requirements for charging refrigerant, including contamination prevention and pressure testing.
Decommissioning
Steps for safely decommissioning the unit and recovering refrigerant.
Labelling
Requirements for labelling equipment containing flammable refrigerants.
Recovery
Safe practices for recovering refrigerants using approved equipment and cylinders.
Other safety precautions
Additional safety measures for handling flammable refrigerants and components.
OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
Operation control function by wireless remote control
Overview of the wireless remote control buttons and their functions.
Unit ON/OFF button
How to operate the unit using the ON/OFF button and its operational details.
Auto restart function
Explanation of the auto restart function and its cancellation conditions.
Installing two air-conditioners in the same room
Procedure for setting up multiple units to operate with a single remote.
Selection of the annual cooling function
How to enable/disable and understand the annual cooling function's control logic.
Heating only function
How to enable the heating-only function by disconnecting a jumper wire.
High power operation
Details on activating high power mode, its duration, and conditions for cancellation.
Economy operation
How economy operation works, its conditions, and how it's cancelled.
Air flow direction adjustment
How to adjust flap and louver direction using the remote control.
Louver
Specific angles and modes for louver adjustment (swing, spot, wide).
Swing
How flap and louver swing functions operate in different modes.
Memory flap (Flap or louver stopped)
How to set and use the memory function for flap or louver positions.
3D auto operation
How 3D auto operation controls flap and louver based on room conditions.
Timer operation
Details on setting ON Timer, OFF Timer, and Weekly Timer operations.
Air flow range setting
How to set the air flow range for left/right direction adjustment.
Silent operation
How silent operation works by reducing fan and compressor speeds.
Night setback operation
How night setback operation adjusts the heating temperature.
Air flow range setting
Procedure for setting the air flow range using remote control buttons.
Display brightness adjustment
How to adjust the brightness of the unit's display.
AUTO OFF operation
How the auto OFF function stops operation when no one is detected in the room.
Outline of heating operation
Overview of major functional components and control details during heating operation.
Defrost operation
Conditions and procedures for defrost operation in heating mode.
Countermeasure for excessive temperature rise
How to lower the setting temperature to prevent excessive temperature rise.
Outline of cooling operation
Overview of major functional components in cooling mode.
Operation of major functional components in cooling mode
Component status during cooling operation (compressor, fans, valves).
Detail of control in each mode (Pattern)
Control details for each mode, including fuzzy operation.
Fuzzy operation
How fuzzy logic controls fan speed based on temperature differences.
Determination of operation mode
How the operation mode is determined based on indoor and outdoor temperatures.
Operation mode is changes when keep cooling and heating thermostat off 20 minutes and be satisfied following conditions.
How operation mode changes based on thermostat status and conditions.
When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is selected during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.
How unit operates in previous mode after restart or automatic operation selection.
Setting temperature can be adjusted within the following range.
Range and relationship of setting temperatures displayed on the remote control.
Cooling low outdoor air temperature protective control
Protective control for cooling operation at low outdoor temperatures.
Heating high pressure control
Control to prevent high pressure operation during heating.
Heating overload protective control
Protective control for heating operation to prevent overload.
Heating low outdoor temperature protective control
Protective control for heating operation at low outdoor temperatures.
Compressor overheat protection
Protection against compressor overheating.
Current safe
Protection against unsafe current conditions.
Current cut
Protection against current cut failures.
Outdoor unit failure
Identification and handling of outdoor unit failures.
Indoor fan motor protection
Protection mechanisms for the indoor fan motor.
Serial signal transmission error protection
Protection against errors in serial signal transmission.
Rotor lock
Troubleshooting steps for rotor lock issues.
Outdoor fan motor protection
Protection mechanisms for the outdoor fan motor.
Outdoor fan control at low outdoor temperature
Control logic for the outdoor fan at low temperatures.
Refrigeration cycle system protection
Protection controls for the refrigeration cycle system.
MAINTENANCE DATA
Cautions
General safety precautions to follow during maintenance procedures.
Items to check before troubleshooting
Preliminary checks to perform before starting troubleshooting.
Troubleshooting procedure (If the air-conditioner does not run at all)
Step-by-step guide for diagnosing and fixing issues when the unit does not operate.
Troubleshooting procedure (If the air-conditioner runs)
Flowchart for diagnosing issues when the air conditioner is running but malfunctioning.
Self-diagnosis table
Table detailing error codes, causes, and display conditions for self-diagnosis.
Service mode (Trouble mode access function)
How to access and use the service mode for troubleshooting.
Explanation of terms
Definitions of key terms used in service and self-diagnosis data.
Service mode display procedure
Step-by-step guide to accessing and interpreting service mode displays.
Self-diagnosis data
Explanation and examples of self-diagnosis data recorded by the unit.
Stop data
Explanation of stop data related to protective stops and system behavior.
Error code, stop code table
Comprehensive table listing error codes, causes, and recovery.
Inspection procedures corresponding to detail of trouble
Troubleshooting steps for various component errors like sensors and motors.
Current cut
Causes and troubleshooting steps for current cut errors.
Current safe stop
Causes and troubleshooting for current safe stop conditions.
Over heat of compressor
Troubleshooting steps for compressor overheat conditions.
Error of signal transmission
Troubleshooting steps for signal transmission errors between units.
Trouble of outdoor unit
Common troubleshooting steps for issues related to the outdoor unit.
Outdoor fan motor error
Troubleshooting steps for outdoor fan motor errors.
Rotor lock
Troubleshooting steps for rotor lock issues, often related to compressor or outdoor PCB.
Service valve (gas side) closed operation
Troubleshooting steps when the gas side service valve is closed.
Limit switch anomaly
Troubleshooting steps for limit switch anomalies, including checking panel and PCB.
Phenomenon observed after shortcircuit, wire breakage on sensor
Phenomena and causes for sensor issues in the indoor and outdoor units.
Indoor unit
Phenomena and causes for sensor issues in the indoor unit.
Outdoor unit
Phenomena and causes for sensor issues in the outdoor unit.
Checking the indoor electrical equipment
Steps to check the indoor electrical equipment, including PCB and fan motor.
Indoor PCB check procedure
Steps to check the indoor PCB for proper operation and voltage.
Indoor unit fan motor check procedure
Procedures to check the indoor unit fan motor and its output.
Indoor PCB output check
Procedure for checking output voltages from the indoor PCB.
Fan motor resistance check
How to measure fan motor resistance to diagnose faults.
How to make sure of wireless remote control
Method to check if the wireless remote control is functioning correctly.
Inspection procedure for blown fuse on the indoor and outdoor PCB
Steps to inspect and replace blown fuses on indoor and outdoor PCBs.
Outdoor unit inspection points
Visual guide to inspection points on the outdoor unit's PCB.
Outdoor unit inspection points
Detailed electrical inspection points for the outdoor unit.
Outdoor unit inspection points
Inspection procedures for electronic expansion valve, sensors, fan motor, and power transistor.
INDOOR UNIT DISASSEMBLY PROCEDURE
Side panel (R/L)
Steps for removing and installing the left and right side panels of the indoor unit.
Front panel
Steps for removing and installing the front panel of the indoor unit.
Removing the front panel
Detailed steps for removing the front panel and related components.
Removing the control cover
Procedures for removing the control cover and disconnecting connectors.
Removing the front panel
Steps for removing the front panel and air outlet grill assembly.
Removing the control box board
Procedures for removing the control box and its components.
Removing the front panel
Steps for removing the front panel and its components.
Removing the control box board
Procedures for removing the control box and its components.
Removing the fan motor ASSY
Steps for removing the fan motor assembly.
Removing the motor case
Procedures for removing the fan motor case.
Removing the fan motor ASSY
Steps for removing the fan motor assembly.
Removing the fan motor
Steps for removing the fan motor and its components.
Removing the gear box ASSY (L/R) and motion sensor ASSY
Procedures for removing the gear box and motion sensor assemblies.
OPTION PARTS
Wired remote control
Safety precautions for installing the wired remote control.
Model RC-EX3
Safety warnings and precautions related to the RC-EX3 wired remote control.
WARNING
Critical warnings about installing the unit in unsuitable environments to prevent hazards.
CAUTION
Cautions regarding installation locations for the remote control to ensure proper function.
Accessories & Prepare on site
Installation place
Guidelines for selecting the installation location and space requirements.
Installation procedure
Installation procedure
Steps for performing the installation and wiring of the remote control.
Main/Sub setting when more than one remote control are used
Advice: Connection to personal computer
Instructions for connecting the unit to a PC via USB for settings.
Advice: Initializing of password
Procedures for initializing administrator and service passwords.
How to set upper and lower limit of temperature setting range
Connection of wired remote control
Wiring instructions for connecting the wired remote control.
Control of multiple units by a single wired remote control
How to control multiple indoor units with one wired remote control.
Master/Slave setting wired when 2 of wired remote control are used
Setting up master and slave roles when using two wired remote controls.
The functional setting
[Flow of function setting]
Visual guide for navigating the function setting menu.
How to set function
How to check the current setting
Method to view the current settings of the air conditioner functions.
Operation and setting from wired remote control
R/C function setting
Settings related to remote control functions like air flow, timer, and sensors.
IU settings
Settings specific to the Indoor Unit (IU) such as fan speed and drain pump operation.
Service & Maintenance
Options for servicing and maintenance, including IU address and error history.
Contact company
Information on how to contact the company for support or service.
Inspection
Information displayed when an error occurs, indicating the need for inspection.
PC connection
Instructions for connecting the unit to a PC via USB for settings.
Connection of Superlink E board
Functions of CnT connector
Details on the functions and settings available through the CnT connector.
Installation of the interface
Mounting the interface directly on a wall
Procedures for installing the interface kit directly on a wall.
Recessing the interface in the wall
Steps for recessing the interface kit into a wall.
Mounting the interface with the mounting bracket
Procedures for mounting the interface kit using a bracket.
Installation check items
Checklist for verifying correct installation of the interface kit.
Superlink E board (SC-ADNA-E)
Installation
Steps for installing the Superlink E board, including mounting and wiring.
Indicator display
Explanation of indicator lights and their meanings during Superlink E board operation.
REFERENCE
Outline
General introduction to the reference section.
R32 as the alternative refrigerant for residential air-conditioners.
Discussion on the use of R32 refrigerant and its environmental impact.
Chemical characteristics of R32
Chemical properties, pressure characteristics, and safety of R32 refrigerant.
Chemical charactaristic
Detailed chemical composition and properties of R32 refrigerant.
Pressure charactaristic
Comparison of R32 pressure characteristics with R410A and R22.
General
General information requirements for manuals regarding refrigerant handling and room safety.
The following information shall be specified in the manual where the information is needed for the function of the manual and as applicable to the appliance:
Specific details required in manuals for appliances containing flammable refrigerants.
Qualification of workers
Requirements for competent persons performing safety-affecting work procedures.
Cautions for safety
General safety cautions for handling equipment with flammable refrigerants.
Transport of equipment containing flammable refrigerants
Regulations for transporting equipment with flammable refrigerants.
Marking of equipment using signs
Importance of safety signs and employee training on their meaning.
Disposal of equipment using flammable refrigerants
Guidelines for the proper disposal of equipment with flammable refrigerants.
Symbols
Explanation of warning symbols used in the manual.
General
General information requirements for manuals related to refrigerant handling and room safety.
The following information shall be specified in the manual where the information is needed for the function of the manual and as applicable to the appliance:
Specific details required in manuals for appliances containing flammable refrigerants.
Qualification of workers
Examples of working procedures requiring competent persons.
Checks to the area
Safety checks for the installation area to minimize ignition risks.
Work procedure
Controlled work procedures to reduce risks with flammable gas or vapor.
General work area
Safety measures for the work area, including confined spaces.
Checking for presence of refrigerant
Using detectors to check for potentially toxic or flammable atmospheres.
Presence of fire extinguisher
Ensuring fire extinguishing equipment is available for hot work.
No ignition sources
Strict prohibition of ignition sources near refrigeration systems.
Ventilated area
Ensuring adequate ventilation before and during system work.
Checks to the refrigeration equipment
Checks on refrigeration equipment components and adherence to guidelines.
Checks to electrical devices
Safety checks for electrical devices, including capacitors and earth bonding.
Repairs to sealed components
Procedures for safely repairing sealed components after disconnecting power.
Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered in such a way that the level of protection is affected.
Ensuring electrical component work does not compromise the casing's protection level.
Repair to intrinsically safe components
Guidelines for working on intrinsically safe components in flammable atmospheres.
Cabling
Checks for cabling condition, considering wear, corrosion, and vibration.
Detection of flammable refrigerants
Strict prohibition of ignition sources during refrigerant leak detection.
Leak detection methods
Acceptable methods for detecting refrigerant leaks, including electronic detectors.
Removal and evacuation
Procedures for safely removing and evacuating refrigerant from the system.
Charging procedures
Requirements for refrigerant charging, including contamination prevention and pressure testing.
Decommissioning
Steps for safely decommissioning the unit and recovering refrigerant.
Labelling
Requirements for labelling equipment containing flammable refrigerants.
Recovery
Safe practices for recovering refrigerants using approved equipment and cylinders.
Need help?
Do you have a question about the SRK25ZSX-W and is the answer not in the manual?
Questions and answers