Mitsubishi Heavy Industries Air Conditioner User Manual

Introduction

Thank you for choosing a Mitsubishi Heavy Industries Thermal Systems, Ltd. air conditioner. To ensure long-lasting and reliable operation, please read this user manual carefully before use and keep it for future reference. Consult this manual for any operational questions or irregularities.

Environmental Considerations:

The device may be marked with a symbol indicating it is Waste Electrical and Electronic Equipment (WEEE) according to Directive 2012/19/EU. This means the air conditioner should not be mixed with general household waste. It must be sent to an approved treatment facility for reuse, recycling, or recovery. Contact your installer or local authorities for more information.

Battery Disposal:

Batteries must be disposed of separately from household waste at the end of their life. If a chemical symbol (Hg, Cd, Pb) is printed on the battery, it indicates the presence of heavy metals. Dispose of batteries properly at designated collection points or hazardous waste sites.

The sound pressure level of the indoor and outdoor units is below 70 dB(A).

Safety Instructions

General Warnings:

• Read all safety instructions carefully before operating the system to ensure proper functioning.
• Keep this manual for future reference.
• Symbols used in this manual:
• 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.
• Pay close attention to these safety instructions for your personal safety.
• This unit uses refrigerants R32 or R410A. Check the outdoor unit's nameplate for the specific refrigerant type.
• Forbidden Symbol: Indicates actions that are strictly prohibited.
• Observe Symbol: Indicates that instructions must be followed carefully.
• Grounding Symbol: Indicates the need for proper grounding.
• Manual Symbol: Indicates that the user manual must be read.
• Professional Installation Symbol: Indicates that the unit must be installed by qualified personnel according to the installation manual.

Specific Warnings for R32:

This unit uses flammable refrigerant (R32). If refrigerant leaks and an ignition source is present, a fire may occur.

• WARNING:
• When disposing of the unit, national regulations must be strictly followed.
• Do not use any means other than those recommended by the manufacturer for faster defrosting or cleaning.
• Operate the unit in a room without continuously operating ignition sources (e.g., open flames, gas appliances, electric heaters).
• Do not puncture or incinerate.
• Be aware that refrigerant may be odorless.
• Ensure the unit is operated in a well-ventilated area with sufficient space for operation.
• Maintenance personnel must possess appropriate national qualifications.
• The indoor unit requires a minimum room size of 4.0 m². (This applies to split systems; refer to the outdoor unit's installation sheet for multi-systems.)

Installation Precautions:

• WARNING:
• The system is intended for domestic and private use. Using it in other environments may lead to malfunctions.
• Installation must be performed by a dealer or qualified installer. Do not attempt self-installation, as improper handling can lead to electric shock or fire.
• CAUTION:
• Do not install near potential leaks of flammable gases, as gas leaks can cause fire.
• Ensure a residual current device (RCD) is installed. Do not install an earthed circuit breaker, as this can cause electric shock.
• Ensure the drain hose is correctly installed for proper water drainage. Improper installation can cause water leakage and damage furniture.
• Ensure the unit is properly grounded. Never connect the grounding cable to gas pipes, water pipes, lightning conductors, or telephone grounding wires. Improper grounding can cause electric shock.

Refrigerant Information:

This product contains fluorinated greenhouse gases. R32 has a Global Warming Potential (GWP) of 675. R410A has a GWP of 2088. The amount of refrigerant and CO2 equivalent is listed on the outdoor unit's nameplate.

Operational Precautions:

• WARNING:
• Do not let children play with the air conditioner.
• Do not expose yourself to direct cold air for extended periods, as this can cause physical harm or health problems.
• Do not insert objects into the air outlet, as the internal fan rotates at high speed and can cause injury.
• Children aged 8 and above, and persons with reduced physical, sensory, or mental capabilities, may use the unit if supervised or instructed on safe operation and understand the risks.
• Keep the remote control out of reach of children to prevent accidental ingestion of batteries or other accidents.
• CAUTION:
• Use only proper fuses. Using copper wire instead of fuses is strictly prohibited and can cause failure or fire.
• Do not operate switches with wet hands, as this can cause electric shock.
• Do not swing on or hang from the indoor unit, as it could fall and cause injury.
• Do not place flammable insect repellents or paint cans near the unit, or spray them directly onto the system, as this can cause fire.
• Do not place combustion appliances in the direct airflow of the unit, as this may cause malfunctions.
• Do not clean the unit with water, as this can cause electric shock. Using a high-pressure cleaner can damage the aluminum fins and reduce performance.
• Do not touch the heat exchanger's aluminum fins, as this can cause injury.
• Do not place electrical appliances or objects under the indoor or outdoor units. Condensate dripping from the unit can soil objects and cause accidents or electric shock.
• Do not operate the system without the air filter, as this can lead to system malfunction due to heat exchanger blockage.
• Do not disconnect the power immediately after shutting down the unit. Wait at least 5 minutes to prevent water leakage or malfunctions.
• Do not operate the unit via the main power switch, as this can cause fires or water leaks, and the fan may start unexpectedly, causing injury.
• Do not pour liquids into the unit or place water containers on it. Water entering the unit can damage insulation and cause electric shock.
• For internal cleaning of the indoor unit, contact your dealer. Do not attempt self-cleaning, as unapproved solvents or incorrect washing methods can damage plastic parts and cause leaks, smoke, or fire.
• During thunderstorms or lightning, switch off the unit and disconnect it from the power supply to prevent damage.
• If the power cord is damaged, contact your dealer or a qualified installer. Failure to replace it can cause failure or fire.

Transport and Repair Precautions:

• WARNING:
• Do not attempt repairs or modifications yourself. Consult your dealer for any necessary repairs. Improper repairs can lead to water leaks, electric shock, or fire.
• For more information on repairs, contact your dealer. Faulty repairs can cause electric shock or fire.
• If the air conditioner needs to be moved, contact your dealer or a qualified installer. Improper installation can cause water leaks, electric shock, or fire.
• If you notice anything unusual (e.g., burning smell), switch off the system, disconnect the power supply, and inform your dealer. Continued use under abnormal conditions can lead to malfunction, electric shock, or fire.
• If the unit does not cool or heat, there may be a refrigerant leak. Contact your dealer. If refrigerant needs to be refilled, consult your dealer for the correct procedure. Refrigerant contact with skin can cause frostbite. Inhaling refrigerant gas can cause nervous system deterioration (dizziness, headache) or heart function deterioration. If refrigerant leaks onto a heater, harmful gases may be produced.

Tips for Effective Operation

Follow these tips for economical and efficient operation:

• Room Temperature: Avoid extreme temperatures; maintain a comfortable room temperature for health and energy saving.
• Filter Maintenance: Clean filters regularly. Clogged filters restrict airflow and reduce efficiency.
• Sunlight and Drafts: Avoid direct sunlight and drafts. Use curtains or blinds during cooling operation. Keep windows and doors closed, except for ventilation.
• Airflow Direction: Adjust airflow (up/down, left/right) for even room temperature distribution.
• Operation Timing: Use timers appropriately for efficient operation.
• Heat Sources: Remove any heat sources from the room during cooling operation.

Parts Identification

Indoor Unit:

The indoor unit features an air inlet flap, air filter, fan, room temperature sensor, air outlet, heat exchanger (aluminum fins), vertical louvers for left/right airflow adjustment, horizontal louvers for up/down airflow adjustment, a motion sensor, and a display panel. It also houses air purification filters (Allergen filter and Photocatalytic odor-removing filter).

Outdoor Unit:

The outdoor unit includes air inlets (rear and side), a fan, a heat exchanger (aluminum fins), a drain opening, a model name label, refrigerant pipe connections, and a drain hose.

Remote Control:

The remote control includes an ON/OFF button, mode selection buttons (MODE), temperature adjustment buttons (TEMP), fan speed control (FAN SPEED), airflow direction control (AIR FLOW U/D, AIR FLOW L/R), special mode buttons (HI/ECO, 3D AUTO, SILENT, ALLERGEN CLEAR, NIGHT SETBACK), timer buttons (ON TIMER, OFF TIMER, SLEEP TIMER, WEEKLY TIMER), a MENU button, a SET button, a CANCEL button, and an ACL reset switch. The display shows operating status, temperature, and timer settings. The remote control has a signal receiver.

Accessories:

The unit comes with a remote control, batteries (R03/AAA), and a remote control holder. Air purification filters (Allergen and Photocatalytic) are also included.

Operation Notes:

A summer tone (PipPip) sounds when the preset temperature is 24°C, AUTO mode is selected, or automatic airflow is chosen. A tone (Pip) sounds when the unit is turned off via the ON/OFF button (except in SELF CLEAN mode).

Warnings for Remote Control:

• Do not expose the remote control to direct sunlight or strong light sources.
• Do not spray the remote control with water or liquids.
• Do not drop or handle the remote control roughly.
• Do not place heavy objects on the remote control or step on it.
• Do not place the remote control near high-temperature areas like electric blankets or heaters.
• Ensure there are no obstacles between the remote control and the air conditioner.

Remote Control Operation

Inserting Batteries:

1. Remove the battery cover.
2. Insert two R03 (AAA) batteries, observing polarity.
3. Replace the battery cover.
4. Press the ACL switch with a ballpoint pen tip to reset.

Remote Control Holder:

The holder can be mounted on a wall or pillar. Ensure the air conditioner can receive signals from the chosen location.

Troubleshooting Remote Control:

If the remote control is not functioning:

• Check if batteries are empty and replace them.
• If operation fails, use the temporary operation function on the main unit.
• Contact your dealer for inspection.

Temporary Operation:

The ON/OFF button on the unit can be used temporarily when the remote control is unavailable. The unit operates in AUTO mode with AUTO fan speed and airflow. Pressing the ON/OFF button starts and stops the unit.

Setting Current Time:

1. Press the TIME SETP UP button.
2. Use the ▲ or ▼ (TIMER) buttons to select the day of the week.
3. Press the SET button to confirm the day and start blinking the time.
4. Use the ▲ or ▼ (TIMER) buttons to set the time.
5. Press the SET button to finalize the time setting.

Auto Restart Function:

This function automatically resumes operation from the previous state after a power outage. Timer settings and HIGH POWER mode are reset.

Auto Operation (AUTO):

The unit automatically selects COOL or HEAT mode based on the room temperature when turned on. Press MODE to cycle through modes, then ON/OFF to start.

Temperature Adjustment in AUTO Mode:

The default AUTO temperature is 24°C. Use the ▲ or ▼ (TIMER) buttons to adjust between 18°C and 30°C.

Fan Speed (FAN SPEED):

Press the FAN SPEED button to cycle through fan speeds: AUTO, ULo, Lo, Me, Hi. Note: DRY mode does not allow fan speed adjustment.

Operating Modes (COOL/HEAT/DRY/FAN):

1. Press MODE to select the desired mode (COOL, HEAT, DRY, FAN).
2. Press ON/OFF to start/stop.
3. Press TEMP to adjust the temperature. Recommended settings: COOL (26-28°C), HEAT (22-24°C), DRY (24-26°C).
4. Press FAN SPEED to set fan speed.

Operating Temperature Range:

Ensure operation within specified outdoor (-15 to 46°C for COOL, -20 to 24°C for HEAT) and indoor (18 to 32°C for COOL, 10 to 30°C for HEAT) temperature ranges to prevent malfunctions.

HEAT Mode Characteristics:

The unit uses a heat pump system. Heating performance decreases in colder temperatures. Defrosting may occur, temporarily interrupting heating. Steam may appear during defrosting.

Airflow Direction Setting:

Use AIR FLOW U/D and AIR FLOW L/R buttons to adjust airflow direction. The unit remembers the last set position (Memory Flap). Specific settings are recommended based on installation location (center, left, right).

3D AUTO Operation:

Automatically controls fan speed and airflow direction for efficient room conditioning. Press 3D AUTO to activate/deactivate. This mode is available in AUTO, COOL, or HEAT modes.

Timers (SLEEP, OFF, ON):

SLEEP TIMER: Automatically turns off the unit after a set time, adjusting temperature for comfort. Press SLEEP to set. The timer light (yellow) indicates activation. Cannot be used with ALLERGEN CLEAR or simultaneously with OFF TIMER.

OFF TIMER: Turns the unit off at a set time. Press OFF TIMER, then use ▲/▼ (TIMER) to set time, and SET to confirm. The timer light (yellow) indicates activation.

ON TIMER: Starts the unit at a set time, with pre-operation to reach optimal temperature. Press ON TIMER, then use ▲/▼ (TIMER) to set time, and SET to confirm. The timer light (yellow) indicates activation.

Combined Timers: SLEEP TIMER & ON TIMER, and ON TIMER + OFF TIMER can be set.

Comfort Start: For ON TIMER, the unit starts 5-60 minutes before the set time to reach the desired temperature.

ALLERGEN CLEAR Operation:

Uses enzyme power to eliminate allergens on the filter. Press ALLERGEN CLEAR. This operation runs for approximately 90 minutes. It cannot be used with other timers or modes like HEAT/FAN. Not available for SCM multi-systems.

WEEKLY TIMER: Allows setting up to 4 programs per day for a week. Press WEEKLY to activate/deactivate. Settings can be customized for each day or collectively.

HIGH POWER/ECO Operation:

HIGH POWER: Provides 15 minutes of strong cooling/heating. Press HI/ECO repeatedly to cycle through HIGH POWER, ECO, and Normal. HIGH POWER is automatically cancelled after 15 minutes or if other modes are selected.

ECO Operation: Saves energy by adjusting temperature based on detected motion (via motion sensor). The unit may automatically switch to ECO mode upon restart if previously set.

NIGHT SETBACK Operation: Maintains room temperature around 10°C during cold seasons when away or at night. Press NIGHT SETBACK to activate. Temperature cannot be adjusted during this mode.

SILENT Operation: Reduces noise level, particularly from the outdoor unit. Press SILENT to activate. Note that cooling/heating performance may decrease. SILENT operation is not available in DRY or FAN modes.

MENU Function:

Accesses settings for Display Brightness, AUTO OFF, SELF CLEAN, and PRESET. Use the MENU button to cycle through options, and ▲/▼ (TIMER) to adjust settings, then SET to confirm.

AUTO OFF: Automatically stops the unit after 1 or 2 hours if no motion is detected by the sensor, preventing unnecessary operation. Select the level (1H or 2H) and press SET.

SELF CLEAN: Runs for approximately 2 hours after cooling/dry operation to remove moisture and prevent mold/bacteria growth. Press MENU, then select SELF CLEAN, then SET. The RUN light indicates operation.

PRESET Operation: Allows saving preferred settings (Mode, Temp, Fan Speed, Airflow) for future use. Select PRESET via MENU, configure settings, press SET, then press MODE for over 3 seconds to activate the saved preset.

Maintenance

Before Maintenance:

• Disconnect the unit from the power supply.
• Do not spill liquid on the unit.
• Do not touch the aluminum fins of the heat exchanger.
• Use a stable ladder or surface when removing flaps or filters.
• Do not use hot water (over 40°C), petroleum, paint thinner, gasoline, or harsh cleaning agents, as they can deform or scratch the unit.

During Operation Season:

Cleaning Air Filters:

1. Remove air filters by lifting the air inlet flap.
2. Clean filters with water (approx. 30°C) if heavily soiled. Dry thoroughly.
3. Reinstall filters. Operating without filters can cause dust buildup and damage.

Cleaning the Unit:

Clean the unit with a soft, dry cloth or a vacuum cleaner. A warm cleaning solution can be used for stubborn dirt.

Cleaning the Air Inlet Flap:

Remove and reinstall the flap. Wipe with a soft, dry cloth. Do not wash the flap with water.

Opening and Closing the Air Inlet Flap:

To open, place fingers on the corners of the flap and pull upwards. To close, press evenly on the corners and then lightly in the center.

Seasonal Maintenance:

End of Season: Run the fan for 2-3 hours to dry the interior. Turn off and disconnect the unit from power. Clean filters and reinstall. Clean indoor and outdoor units. Remove batteries from the remote control.

Start of Season: Check grounding wiring. Inspect the outdoor unit base for corrosion. Ensure no obstructions around air inlets/outlets. Turn on the unit. Insert batteries into the remote control.

Air Purification Filters:

Allergen Filter (Light Orange): Removes allergens using enzyme power. Replace approximately annually or when cleaning is ineffective. Can be installed on either side.

Photocatalytic Odor-Removing Filter (Orange): Breaks down odor sources. Can be washed with water but is fragile. Exposure to sunlight renews its deodorizing effect. Can be installed on either side.

Installation and Troubleshooting

Proper Installation:

• Ensure clear airflow around the indoor unit.
• Do not install in locations with flammable gas, oil splatters, corrosive gas, or near salty sea breezes.
• Keep the unit and remote control at least 1 meter away from TVs or radios.
• Ensure condensate water drains properly.
• Install the unit securely to prevent vibration noise.
• Choose a location that minimizes noise disturbance to neighbors.
• Avoid obstructions near the outdoor unit's air inlets/outlets.
• Contact your dealer if unusual noises occur.

Inspection and Maintenance:

Regular inspection and maintenance are recommended for optimal performance and longevity.

Troubleshooting:

Unit does not operate: Check power supply, timer settings, and fuses.

Insufficient Cooling/Heating: Check thermostat setting, air filter cleanliness, closed doors/windows, direct sunlight, other heat sources, and room occupancy.

If problems persist after checking these points, switch off the unit and contact your dealer.

Hints:

• Airflow: No airflow during initial heating or dry modes. This is normal as the unit warms up or prevents condensation.
• Noises: Gurgling, cracking, hissing, or whistling noises may occur due to refrigerant flow, thermal expansion/contraction, or component operation.
• Operation after Shutdown: The unit has a 3-minute delay before restarting to protect the compressor.
• Moisture: Condensation may appear on the air outlet grill in high humidity/temperature conditions.
• Remote Signal Issues: Ensure the remote is not obstructed or exposed to direct sunlight.
• Self-Diagnosis: The unit has a self-diagnosis function that indicates errors via blinking lights on the RUN and TIMER indicators. Refer to the manual for specific error codes and their causes.

Contacting Your Dealer

Contact your dealer immediately if:

• Switches or fuses are constantly activated.
• Cables are hot or insulation is broken.
• Other appliances are disturbed.
• A switch malfunctions.
• Unusual noises occur during operation.
• After restarting the unit, the issue persists.
• RUN and TIMER lights blink rapidly or are off.

Auto Restart Function:

This feature automatically resumes operation from the previous state after a power failure, restoring the previous operating state. Timer settings and HIGH POWER mode are reset.

Multi-Unit Operation:

Units cannot operate in different modes simultaneously (e.g., one cooling, one heating). The first unit started takes priority. If units are in different modes, the RUN light may illuminate. For simultaneous operation, ensure all units are in the same mode or adjust settings accordingly.

Refrigerant Oil:

If units are not operated for a long time, cooling/heating performance may temporarily decrease due to refrigerant oil management.

Self-Diagnosis Function:

The unit has a self-diagnosis system that indicates faults via blinking lights. Refer to the table for specific error codes (e.g., RUN light blinking 1-7 times, TIMER light ON, RUN light blinking continuously) and their corresponding causes (e.g., sensor errors, circuit faults, fan motor issues, refrigerant leaks, compressor problems).

EU Declaration of Conformity

Mitsubishi Heavy Industries Thermal Systems, Ltd. declares that the apparatus conforms with EU directives, including Machinery 2006/42/EC, and applied standards such as EN 378-2, EN 60335-1, and EN 60335-2-40. The authorized representative in the EU is Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd.

Company Information

Contact details for Mitsubishi Heavy Industries Thermal Systems, Ltd. (Japan), Mitsubishi Heavy Industries Air-Conditioning Europe, Ltd. (UK), and Mitsubishi Heavy Industries Air-Conditioners Australia, Pty. Ltd. are provided, including addresses, phone numbers, fax numbers, and websites.