Mitsubishi Heavy Industries Air Conditioner User Manual

Introduction

Thank you for choosing a Mitsubishi Heavy Industries Air Conditioner. This manual provides essential information for the safe and optimal operation of your air conditioner. Please read it carefully before use and keep it in a safe place for future reference.

Safety Precautions

General Warnings:

• WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
• CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or property damage.
• Always follow safety precautions to ensure correct operation and prevent accidents.
• This unit uses refrigerants R32 or R410A. Check the outdoor unit label for specific information.
• Symbols:
• [Prohibited Symbol]: Strictly prohibited.
• [Warning Symbol]: Comply with instructions with utmost care.
• [Information Symbol]: Read the user manual thoroughly.
• [Ground Symbol]: Ensure proper grounding.
• [Service Symbol]: Servicing should be performed by qualified personnel referencing the installation manual.

Specific Precautions for R32:

• This equipment uses flammable refrigerant. Leaks combined with an ignition source can cause ignition.
• Store the unit in a room free from ignition sources (e.g., open flames, gas appliances).
• Do not puncture or incinerate the unit.
• Refrigerants may have odors.
• Ensure the storage room has adequate ventilation and meets specified area requirements.

Installation Precautions:

• This system is for domestic and residential use only.
• Installation must be performed by a qualified vendor or installer to prevent water leaks, electric shock, or fire hazards.
• Do not install where flammable gases may leak, as this can cause fires.
• Ensure a ground fault interrupter (GFI) is installed.
• Ensure the drain tube is installed correctly for complete drainage to prevent water damage to furniture.
• Proper grounding is essential to prevent electric shock. Do not connect the ground wire to gas pipes, water pipes, or telephone ground wires.

Operation Precautions:

• Keep children away from the air conditioner and its remote control.
• Do not expose yourself to direct airflow for prolonged periods, as it may affect your health.
• Do not insert anything into air outlets, as this could damage the fan.
• The unit can be used by children aged 8+ and persons with reduced capabilities if supervised or instructed on safe use.
• Use only approved fuses. Do not use wire or copper in place of a fuse.
• Do not handle switches with wet hands to avoid electric shock.
• Do not hang or swing from the indoor unit.
• Keep flammable aerosols and paints away from the unit.
• Do not place combustion appliances directly in the airflow.
• Do not wash the unit with water; this can cause electric shock. High-pressure cleaning may damage fins.
• Do not use the unit for preserving food, plants, or animals, or for precision devices or works of art.
• Do not place water-containing items (cups, vases) on the unit.
• Do not install the unit where airflow is directed at plants or animals, as it may affect their health.
• Do not step on or sit on the unit.
• Periodically check the unit's support structure for damage.
• Do not touch aluminum fins of the heat exchanger to avoid personal injury.
• Do not place electrical appliances or objects under the unit, as condensation may cause stains or electric shock.
• Do not operate without air filters; this can lead to incorrect operation.
• Wait at least 5 minutes after stopping operation before disconnecting power.
• If the unit is used with a combustion appliance, ensure regular ventilation to prevent oxygen deficiency.
• Use a stable ladder when removing the air intake panel and filters.
• When cleaning, stop the unit and disconnect power. Never open the panel while the fan is spinning.
• Keep the area around the outdoor unit clear of objects and leaves to prevent small animals from entering and causing damage.
• If thunder or lightning is expected, stop the unit and disconnect power.
• If the power cord is damaged, contact your distributor or a qualified installer.

Tips for Effective Operation

• Adjust to a comfortable room temperature; avoid extreme temperatures for health and energy saving.
• Clean filters regularly to maintain efficiency.
• Avoid direct sunlight and drafts. Use curtains or blinds and keep windows/doors closed when cooling.
• Adjust airflow direction (up/down, left/right) for even temperature distribution.
• Operate the unit only when needed, utilizing timer functions.
• Keep heat sources away from the room when cooling.

Parts Identification

Indoor Unit:

• Air Intake Panel: Opens for air intake.
• Air Filters: For cleaning the air.
• Fan: Circulates air within the unit.
• Heat Exchanger (Aluminum Fins): Transfers heat.
• Louver (Vertical Vanes): Adjusts airflow direction left/right.
• Deflectors (Horizontal Vanes): Adjusts airflow direction up/down.
• Air Inlet: Draws in ambient air.
• Air Outlet: Discharges conditioned air.
• Ambient Temperature Sensor: Detects room temperature.
• Movement Sensor: Detects human presence and movement.
• Display Section: Shows operating status.

Outdoor Unit:

• Air Inlet (Rear/Side): Draws in ambient air.
• Fan: Circulates air.
• Heat Exchanger (Aluminum Fins): Transfers heat.
• Air Outlet: Discharges air.
• Drain Port: For condensate drainage.
• Refrigerant Piping & Electrical Connection: Connects to the indoor unit.
• Drain Hose: Carries away condensate.

Remote Control Display & Buttons:

• ON/OFF Button: Powers the unit on/off.
• MODE Button: Selects operating mode (AUTO, COOL, HEAT, DRY, FAN).
• TEMP Buttons (▲/▼): Adjusts temperature.
• FAN SPEED Button: Adjusts fan speed (AUTO, ULo, Lo, Me, Hi).
• AIR FLOW Buttons (U/D, L/R): Adjusts airflow direction.
• TIMER Buttons (ON, OFF, SET, CANCEL): For setting timers.
• SLEEP Button: Activates sleep timer function.
• HI/ECO Button: Selects High Power or Economy mode.
• SILENT Button: Activates silent operation.
• 3D AUTO Button: Enables automatic airflow control.
• NIGHT SETBACK Button: Activates comfort setback for night.
• ALLERGEN CLEAR Button: Activates allergen removal function.
• WEEKLY Button: Activates weekly timer programming.
• MENU Button: Accesses settings like display brightness, AUTO OFF, SELF CLEAN, PRESET.
• TIME SETUP / ACL Button: For time setting and reset.
• RUN Indicator (Green): Shows unit is operating.
• TIMER Indicator (Yellow): Shows timer functions are active.
• Display Screen: Shows current settings (time, mode, temperature, fan speed).

Operating Modes

Basic Operation:

• ON/OFF: Press the ON/OFF button on the remote or unit to start/stop operation.
• AUTO Mode: The unit automatically selects COOL, HEAT, or FAN based on room temperature.
• COOL Mode: For cooling the room. Recommended temperature: 26-28°C.
• HEAT Mode: For heating the room. Recommended temperature: 22-24°C.
• DRY Mode: For dehumidifying. Recommended temperature: 24-26°C. Fan speed cannot be adjusted in DRY mode.
• FAN Mode: Circulates air without heating or cooling.

Advanced Functions:

• Fan Speed: Adjusts fan speed (AUTO, ULo, Lo, Me, Hi).
• Airflow Direction: Adjust louvers/vanes for desired airflow (up/down, left/right). The unit can memorize the last set position.
• 3D AUTO: Automatically controls fan speed and airflow direction for efficient room conditioning.
• HIGH POWER (HI): Provides powerful cooling/heating for 15 minutes. Cancels automatically or can be manually cancelled.
• ECO Mode: Energy-saving operation that adjusts settings based on detected movement and room temperature for comfort.
• NIGHT SETBACK: Maintains a comfortable temperature (approx. 10°C) during sleep or when the room is unoccupied in cold weather to save energy.
• SILENT Mode: Reduces outdoor unit noise for quieter operation.
• SLEEP TIMER: Automatically stops the unit after a set time, with gradual temperature adjustments to prevent overcooling/overheating.
• OFF TIMER: Sets the unit to stop at a specific time.
• ON TIMER: Sets the unit to start at a specific time, often with a pre-start function to reach optimal temperature.
• WEEKLY TIMER: Allows programming of ON/OFF cycles for each day of the week.
• ALLERGEN CLEAR: Uses enzymes to remove allergens from the air filter. Recommended for use when the room is unoccupied.
• SELF CLEAN: Operates after cooling/dehumidifying modes to dry the indoor unit and prevent mold growth.
• PRESET Function: Saves preferred settings for quick recall.
• AUTO OFF: Automatically stops the unit after a set period (1 or 2 hours) if the movement sensor detects no one in the room.

Maintenance

• Before Maintenance: Disconnect power. Do not spill liquids on the unit. Do not touch aluminum fins. Use a stable ladder. Avoid hot water, gasoline, or solvents for cleaning.
• Cleaning Air Filters: Clean filters every two weeks or when dirty. Remove filters by pulling the air intake panel forward. Wash filters with lukewarm water (approx. 30°C) and dry them. Replace if very dirty or after one year of use.
• Cleaning the Unit: Wipe the unit with a soft, dry cloth or vacuum. For heavy dirt, use a damp cloth with lukewarm water.
• Cleaning Air Intake Panel: Remove the panel and clean with a dry cloth.
• Seasonal Maintenance: At the end of the season, run the fan for 2-3 hours to dry the interior, then turn off and disconnect power. Remove remote control batteries. At the beginning of the season, check grounding, outdoor unit frame for rust, and ensure no airflow obstructions.

Troubleshooting

Common Issues:

• No Airflow (Heating): Unit may be pre-heating or defrosting. Wait 2-5 minutes.
• No Airflow (DRY Mode): Normal operation.
• Unusual Noises: Refrigerant flow, plastic expansion/contraction, valve operation, compressor speed changes, or stopping of another indoor unit.
• Unit Not Restarting Immediately: A 3-minute protection timer is active.
• Remote Control Issues: Check batteries, ensure unobstructed line of sight, avoid direct sunlight on the receiver.
• Moisture/Dripping: May occur with prolonged high humidity or incorrect airflow settings in COOL/DRY modes.
• Bad Odor: May be caused by tobacco or cosmetics absorbed by the unit.
• Auto-Diagnosis: The unit has a self-diagnosis function indicated by flashing RUN/TIMER lights. Refer to the manual for error codes (e.g., sensor errors, motor errors, refrigerant issues).

If Problems Persist: Contact your distributor if issues are not resolved after checking the manual or if specific error conditions are met.

Technical Information & Declarations

EU Declaration of Conformity:

• Mitsubishi Heavy Industries Thermal Systems, Ltd. declares that the Split Type Air Conditioner conforms to EU directives (Machinery 2006/42/EC) and applied standards (EN 378-2, EN 60335-1, EN 60335-2-40).
• Authorised Representative in the EU: Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd.

Company Contact Information:

• Japan: Mitsubishi Heavy Industries Thermal Systems, Ltd.
• Europe: Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. (www.mhiae.com)
• Australia: Mitsubishi Heavy Industries Air-Conditioners Australia, Pty. Ltd. (www.mhiaa.com.au)