Introduction
Thank you for purchasing a Mitsubishi Heavy Industries air conditioner. Please read this user's manual carefully and follow its instructions to ensure proper and long-lasting operation of your air conditioner. Keep this manual handy for future reference or in case of any operational issues.
This unit uses refrigerants R32 and R410A, which are fluorinated greenhouse gases. Please refer to the unit's rating plate for specific information on the refrigerant type and its CO2 equivalent.
Safety Precautions
Please read and follow all safety precautions carefully to ensure your safety and prevent damage to the unit.
General Warnings
- ⚠️ WARNING: Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
- ⚠️ CAUTION: Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury or property damage.
- Always follow the instructions provided in this manual.
- Ensure proper grounding of the unit.
Refrigerant Safety (R32/R410A)
- ⚠️ WARNING: This equipment uses flammable refrigerants. If refrigerant leaks near an ignition source, there is a risk of fire.
- Refrigerants may be odorless.
Installation Safety
- This unit is designed for residential use only.
- Installation must be performed by a qualified technician or dealer. Do not attempt self-installation, as incorrect installation can lead to refrigerant leaks, water leaks, electric shock, or fire.
- Do not install the unit in locations where flammable gas may leak.
- A residual current device (RCD) or Ground Fault Circuit Interrupter (GFCI) must be installed.
- Ensure the drain hose is properly installed to allow complete water drainage.
- Proper grounding is essential. Do not connect the ground wire to gas pipes, water pipes, lightning conductors, or telephone grounding wires.
Operation Safety
- ⚠️ WARNING: Children should not play with the air conditioner.
- Do not expose yourself to prolonged direct cold airflow, as it may affect your health.
- Cleaning and user maintenance should not be performed by children without supervision.
- Do not insert fingers or objects into air outlets, as the internal fan rotates at high speed and can cause injury.
- Use only specified fuses.
- Do not touch controls with wet hands, as this may cause electric shock.
- Do not swing from or hang on the indoor unit.
- Keep flammable sprays (insecticides, paints) away from the unit.
- Do not place fuel-burning appliances directly in the airflow.
- Do not wash the unit with water, as this can cause electric shock.
- Do not use high-pressure washers, as they may damage the unit.
- Do not use the unit for storing food, plants, or artwork.
- Do not place water containers (e.g., vases) on the unit.
- Do not direct airflow onto plants or animals, as it may be harmful to them.
- Do not stand or sit on the unit.
- Periodically check the mounting structure for secure fastening.
- Do not touch the heat exchanger fins.
- Keep the area around the outdoor unit clear of obstructions and leaves to prevent foreign objects from entering and contacting electrical parts.
- ⚠️ CAUTION: Do not disconnect power immediately after stopping the unit. Wait at least 5 minutes.
- Do not attempt to operate the unit using the main power switch.
- Protect the unit from liquids and do not place water containers on it.
- Consult your dealer for internal cleaning of the unit.
- During thunderstorms, stop operation and disconnect power.
- If the power cord is damaged, contact a qualified technician.
Maintenance & Repair Safety
- Do not attempt to repair or modify the unit yourself. Contact your dealer for any repairs.
- If the unit is not cooling or heating, check for refrigerant leaks and contact your dealer.
- Inhaling refrigerant gas can cause dizziness, headaches, or cardiac arrhythmias.
- Refrigerant leaks near heat sources can produce harmful gases.
Parts Identification
Indoor Unit
The indoor unit includes:
- Air Intake Grille: Where air is drawn into the unit.
- Air Outlet: Where conditioned air is discharged.
- Air Filter: Cleans incoming air.
- Refrigerant Pipe and Electrical Connections: Connects the indoor and outdoor units.
- Display Unit (Remote Control Signal Receiver): Receives signals from the remote control.
- Drain Hose: For draining condensate water from the indoor unit.
Outdoor Unit
The outdoor unit includes:
- Air Intake: Located on the side and rear surfaces.
- Air Outlet: Where air is expelled.
- Outdoor Fan Motor: Drives the fan.
- Heat Exchanger: Facilitates heat transfer.
Accessories
Included accessories typically consist of:
- Wireless Remote Control.
- Wall Mount Bracket for the remote control.
- Screws for mounting the bracket.
- Batteries (e.g., R03/AAA).
Remote Control Operation
Display and Indicators
The remote control display shows the current time, day of the week, operating mode, fan speed, temperature settings, and timer status. Indicators include RUN (green), TIMER (yellow), HIGH POWER (green), and ECONO (orange).
Key Buttons
- MODE: Selects operating mode (AUTO, COOL, HEAT, DRY, FAN).
- TEMP: Adjusts the set temperature (▲/▼).
- HI/ECO: Switches between HIGH POWER and ECONOMY modes.
- FAN SPEED: Adjusts fan speed (AUTO, ULo, Lo, Me, Hi).
- AIR FLOW: Adjusts the vertical airflow direction (U/D).
- SILENT: Activates the SILENT mode for reduced noise.
- NIGHT SETBACK: Activates the mode for maintaining a comfortable temperature at night.
- ON TIMER: Sets the timer for the unit to turn ON.
- OFF TIMER: Sets the timer for the unit to turn OFF.
- WEEKLY: Activates the weekly timer function.
- SLEEP: Activates the SLEEP timer function.
- CLEAN: Activates the self-cleaning function.
- SET: Confirms settings and activates child lock.
- CANCEL: Cancels timer settings.
- PROGRAM: Used for setting the weekly timer.
- ACL: Reset button for the remote control.
Basic Operation
To operate the unit:
- Press the ON/OFF button to turn the unit on or off.
- Select the desired MODE (e.g., AUTO, COOL, HEAT).
- Adjust the TEMP using the up/down buttons.
- Adjust FAN SPEED as needed.
Timer Operations
- SLEEP TIMER: Automatically adjusts temperature and turns off the unit after a set period.
- OFF TIMER: Turns the unit off at a preset time.
- ON TIMER: Turns the unit on at a preset time.
- WEEKLY TIMER: Allows programming of different ON/OFF times for each day of the week.
- Timers can be set, modified, or cancelled using the respective buttons (ON TIMER, OFF TIMER, SLEEP, WEEKLY, CANCEL).
Child Lock
Press and hold the SET button for 3 seconds to activate or deactivate the child lock feature (indicated by a lock icon ? on the display). When locked, only the ON/OFF button functions.
Operating Modes
- AUTO: The unit automatically selects COOL, HEAT, or FAN mode based on the room temperature.
- COOL: Cools the room.
- HEAT: Heats the room.
- DRY: Dehumidifies the air. Fan speed is fixed in this mode.
- FAN: Circulates air without cooling or heating.
- HIGH POWER: Provides maximum cooling or heating for 15 minutes for rapid temperature adjustment.
- ECONOMY: Operates at a slightly reduced capacity to save energy, adjusting temperature by 1.5°C (cooling) or 2.5°C (heating) from the set point.
- SILENT: Reduces the noise level of the outdoor unit for quieter operation.
- NIGHT SETBACK: Maintains a minimum temperature (approx. 10°C) during the night or when the room is unoccupied to prevent excessive cooling or heating.
- SELF CLEAN: Operates for approximately 2 hours after cooling or drying to remove moisture from the indoor unit, preventing mold and bacteria growth.
Tips for Effective Operation
- Set an appropriate room temperature. Avoid extreme settings that waste energy and can affect comfort.
- Regularly clean the air filters. Clogged filters reduce efficiency and increase noise.
- Avoid direct sunlight and drafts. Close curtains or blinds during cooling operation.
- Ensure proper airflow by keeping indoor unit vents clear.
- Use timers effectively to operate the unit only when needed.
- Keep doors and windows closed when the unit is operating, except for ventilation.
- Keep heat sources away from the unit during cooling operation.
Appliance Care
Before Cleaning
- Disconnect the power supply before cleaning.
- Do not allow water to enter the unit.
- Wipe the unit with a soft, dry cloth.
- Do not touch the aluminum fins of the heat exchanger.
- Do not use hot water (over 40°C), gasoline, solvents, or polishing agents, as they can cause deformation or discoloration.
During the Operating Season
- Clean the air filters regularly. Refer to dealer for cleaning instructions.
End of Season
- Run the fan for 2-3 hours to dry the interior components.
- Stop the unit and disconnect the power supply.
- Clean the air filters and reinstall them.
- Remove batteries from the remote control if the unit will be stored for an extended period.
Start of Season
- Check the grounding wire for damage or disconnection.
- Inspect the outdoor unit's mounting base for corrosion or rust.
- Ensure no objects obstruct the airflow at the indoor and outdoor unit vents.
- Connect the power supply.
- Insert batteries into the remote control.
Troubleshooting
Before calling for service, check the following:
- Unit does not operate: Check if the power switch is on. Check if a timer is set. Check for power outage or blown fuse.
- Weak cooling or heating: Check if the thermostat is set correctly. Check if the air filter is clean. Ensure doors/windows are closed. Check for direct sunlight or heat sources in the room.
- Other issues: Refer to the self-diagnosis section for error codes indicated by blinking RUN and TIMER lights.
If problems persist after these checks, contact your dealer.
Notes on Operation
Airflow
- During HEATING start-up, there may be no airflow for 2-5 minutes as the unit warms up.
- During defrosting (especially in cold, humid conditions), the unit may temporarily stop heating and emit steam. This is normal.
- The indoor fan may stop temporarily to prevent moisture from being blown out.
Noise
- Bubbling or crackling sounds may occur due to refrigerant circulation or thermal expansion/contraction.
- Hissing or whistling sounds may indicate normal operation of control valves or the compressor.
Other
- The unit may have a 3-minute delay before restarting after being switched off to protect the compressor.
- In COOL mode, slight steam may be emitted from the indoor unit, especially in humid conditions.
- If the unit does not receive signals from the remote control, check for obstructions or direct sunlight on the remote receiver.
- Moisture may form on the air outlet grilles if the unit has been idle in high humidity.
- The fan may continue to run for a short period after shutdown for cooling or cleaning operations.
Contact Information
For service, support, or inquiries, please contact:
MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
16-5 Konan 2-chome, Minato-ku, Tokyo, 108-8215, Japan
http://www.mhi-mth.co.jp/en/
MITSUBISHI HEAVY INDUSTRIES AIR-CONDITIONING EUROPE, LTD.
5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET, United Kingdom
Tel: +44-333-207-4072
Fax: +44-333-207-4089
http://www.mhiae.com/
MITSUBISHI HEAVY INDUSTRIES AIR-CONDITIONERS AUSTRALIA, PTY. LTD.
9C Commercial Road Kingsgrove NSW 2208 PO BOX 318 Kingsgrove NSW 1480
Tel : +61-2-8571-7977
Fax: +61-2-8571-7992
http://www.mhiaa.com.au
