Mitsubishi Heavy Industries Air-Conditioner User's Manual

Safety Precautions

Before starting to use the system, please read these "Safety precautions" carefully to ensure proper operation. Keep this manual safely for future reference. If someone else takes over as user, ensure the manual is passed on.

WARNING

Indicates a potentially hazardous situation which, if not avoided, can result in serious consequences such as death or severe injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, can result in personal injury or property damage.

Symbols

• ? Strictly prohibited
• ? Observe instructions with great care
• ⚡ Provide proper earthing

For R32 Refrigerant

This equipment uses flammable refrigerants. If leaked with an ignition source, ignition is possible.

Observe domestic laws when disposing. Do not use means to accelerate defrosting or clean other than recommended. Store in a room without continuously operating ignition sources. Do not pierce or burn. Be aware refrigerants may not contain an odour.

Store in a well-ventilated area. Service staff must hold national qualifications. Indoor unit requires minimum 4.0 m² area.

Installation Precautions

WARNING

The system is for domestic and residential use. Installation must be done by a dealer or qualified installer to prevent water leakage, electric shock, or fire.

CAUTION

Do not install where flammable gas may leak. Ensure an earth leakage breaker is installed. Install the drain hose properly to prevent water damage. Ensure the system is properly earthed, never connecting earth wire to gas/water pipes or lightning conductors.

This product contains fluorinated greenhouse gases (R32, GWP=675).

Operation Precautions

WARNING

Children shall not play with the air-conditioner. Do not expose yourself to cooling air for extended periods. Cleaning and maintenance should not be done by unsupervised children. Do not insert anything into the air outlet, as the internal fan rotates at high speed. Children aged 8+ and persons with reduced capabilities can use the unit with supervision. Store the remote control out of reach of children.

CAUTION

Use only approved fuses. Do not use steel or copper wire instead of fuses. Do not handle switches with wet hands. Do not swing from the indoor unit. Do not place flammable insecticides or spray near the unit. Do not expose combustion appliances to the airflow. Do not wash the unit with water. Do not use for food preservation or with precision devices. Do not place water containers on the unit. Do not aim airflow at plants or animals. Do not step or sit on the unit. Regularly check the unit's support structure.

Do not touch aluminum fins. Do not place electrical appliances or household items underneath the unit. Do not operate without air filters. Do not pour liquid into the unit. Ventilate the room when operating with combustion appliances. Stand firmly on stable objects when cleaning. Stop the unit and turn off power before cleaning. Do not place objects or allow leaves around the outdoor unit.

Do not shut off power immediately after stopping operation. Wait 5 minutes. Do not control the system with the main power switch. Contact your dealer for repairs or if the power cable is damaged.

Wireless LAN Precautions

WARNING

Do not use wireless LAN near automatic control equipment, in hospitals where wireless devices are prohibited, or near individuals with pacemakers/defibrillators, as it may cause equipment malfunction.

CAUTION

Do not use wireless LAN near other wireless devices or microwaves. When operating from outdoors, confirm unit status and room occupants. Notify occupants if operating from outdoors. Check operational status periodically, as sudden temperature changes can affect health.

Precautions for Relocation or Repairs

WARNING

Do not perform repairs yourself; consult your dealer. Improper repairs can cause leaks, shocks, or fire. If the unit fails to cool/warm, contact your dealer for potential refrigerant leaks. If refrigerant contacts skin, it can cause cold injury. Inhaling refrigerant gas can cause dizziness, headache, or heart palpitations. If refrigerant leaks onto a heat source, harmful gases may be generated.

Tips for Effective Operation

• Set a suitable room temperature.
• Clean filters frequently for efficient operation.
• Avoid direct sunlight and draughts; close windows and doors when cooling.
• Adjust airflow direction properly for steady room temperature.
• Operate the unit only when needed, using timers.
• Keep heat sources out of the room when cooling.

Name of Each Part and Its Function

Indoor Unit

Components include: Air inlet panel, Air filters, Fan, Heat exchanger (Aluminum fin), Louvers (Vertical blades for left/right airflow), Flaps (Horizontal blades for up/down airflow), Air outlet, Room temperature sensor, Unit display section, Air-cleaning filter (Allergen clear filter).

Outdoor Unit

Components include: Air inlet, Fan, Heat exchanger (Aluminum fin), Air outlet, Model name and refrigerant type, Refrigerant pipe and electric wire, Drain hose.

Warnings on units: Do not insert anything into air outlets. Do not touch aluminum fins. Do not step on the unit.

Remote Control

Setting the Batteries

Remove cover, insert 2 x R03 (AAA) batteries, paying attention to polarity. Do not mix old/new or different types of batteries. Alkaline batteries are recommended. Remove batteries if not used for a long period. Recommended battery life is 6-12 months. If display is abnormal, press ACL switch.

Using the Remote Control Holder

The holder can be wall-mounted. Move the remote up or down in the holder to install/remove.

Warning Note for Remote Control

Strictly prohibited: Do not place near high temperatures (stoves), expose to direct sunlight, spill liquid, or place obstructing objects or heavy objects on it.

Operation Failure with the Remote Control

If operation fails, check batteries or use temporary run operation. Contact dealer if issues persist.

Temporary Run Operation

The unit ON/OFF button on the unit can be used temporarily when the remote control is not available. Default settings are AUTO mode, AUTO fan speed, AUTO airflow. Press ON/OFF to start/stop.

Installing Two Air-Conditioners in the Same Room

Use this setting if two units are not operated with one remote. Involves disconnecting a switching line in the remote control and setting the indoor unit by sending a signal.

Child Lock

Locks remote control operation to prevent errors. Press AIRFLOW L/R for 3+ seconds to activate (displays ). Only ON/OFF button works. Press again to cancel. Settings like mode, temperature, fan speed cannot be changed while locked.

Airflow Range Setting

Adjust left/right airflow for optimal air-conditioning based on installation location. Stop the unit, press AIRFLOW U/D and L/R buttons together for 5+ seconds to enter setting mode. Use AIRFLOW L/R to select center, right end, or left end installation. Press ON/OFF to confirm. Setting is stored even after power loss.

Operation and Display Section for Remote Control

Details the functions of each button on the remote control, including LCD screen indicators, transmission section, and transmission procedure.

Current Time Setting

After inserting batteries, the unit enters time setting mode (default 13:00). Press TIME SET UP switch, then use TEMP/TIMER buttons to set time, and press ON/OFF to confirm. Setting must be done within 60 seconds.

AUTO Mode Operation

Automatically selects COOL or HEAT mode based on room temperature. Press MODE button to cycle through modes (AUTO, COOL, HEAT, DRY, FAN). Press ON/OFF to start/stop.

Temperature Adjustment During AUTO Mode

Default AUTO temperature is 24°C. Use TEMP/TIMER button with or buttons to adjust between 18°C and 30°C.

FAN SPEED

Set fan speed (except DRY mode) using FAN SPEED button and or buttons. Options: AUTO, ULo, Lo, Me, Hi. Sound of refrigerant may be heard when changing speed. FAN SPEED may adjust automatically in COOL mode at low outside temperatures.

COOL/HEAT/DRY/FAN Mode Operation

Select mode using MODE button (COOL, HEAT, DRY, FAN). Press ON/OFF to start. Set temperature using TEMP/TIMER button. Set fan speed using FAN SPEED button. Recommended temperatures: COOL (26-28°C), HEAT (20-24°C), DRY (24-26°C).

Air-Conditioner Operation Temperature Range

Characteristics of HEAT Mode Operation

The unit transfers heat from outside air. Heating capacity reduces in colder temperatures. It may take time to supply hot air. Use additional heating sources in extremely low temperatures.

Defrosting

In low temperatures and high humidity, the outdoor unit heat exchanger may frost over. Automatic defrost function activates, stopping heating for 5-15 minutes. RUN light blinks slowly during defrosting. Outdoor unit may release steam. Heating resumes after defrosting.

Airflow Direction Adjustment

Adjust up/down airflow using AIRFLOW U/D button. Adjust left/right airflow using AIRFLOW L/R button. Modes include stopped and swing. For heating, airflow is fixed horizontally/center to avoid cold drafts. Memory flap/louver function allows saving a stopped position. WARNING: Do not expose directly to airflow for long periods. CAUTION: Avoid prolonged downward airflow in COOL/DRY modes to prevent condensation. Do not adjust flaps/louvers by hand.

3D AUTO Operation

Automatically controls fan speed and airflow direction for efficient air-conditioning. Press ON/OFF to start, then 3D AUTO button to activate. Press 3D AUTO again to cancel. Operation mode change also cancels 3D AUTO.

SLEEP TIMER Operation

Unit stops automatically after set time. Temperature adjusts to prevent discomfort. Press SLEEP button to activate (unit stops after set time). Cannot be set with OFF TIMER.

OFF TIMER Operation

Unit stops automatically at set time. Press ON/OFF, then OFF TIMER button. Use TEMP/TIMER buttons to set time. Press OFF TIMER again to confirm. Timer light illuminates.

ON TIMER Operation

Operation starts 5-60 minutes before set time for optimal temperature. Press ON TIMER button. Use TEMP/TIMER buttons to set time. Press ON TIMER again to confirm. Timer light illuminates. If unit is running, ON TIMER cancels current operation.

SLEEP TIMER + ON TIMER Operation

Combined timer function. Set SLEEP TIMER first, then ON TIMER. Unit stops after SLEEP time and starts before ON time.

PROGRAM TIMER Operation

Combines ON and OFF timers for daily repetition. Set OFF TIMER, then ON TIMER. Timer light indicates setting is complete. Comfort Start-up ensures optimal temperature by starting operation early. SLEEP TIMER automatically adjusts temperature.

ALLERGEN CLEAR Operation

Uses enzyme technology to eliminate allergens from the filter. Press ALLERGEN CLEAR button. Recommended for unoccupied rooms. Operation completes in approx. 90 minutes. Settings cannot be changed during this operation.

HIGH POWER/ECONOMY Operation

HIGH POWER: Intensifies cooling/heating for 15 mins. Displays . Not available in DRY/PROGRAM TIMER. Cancels if other operations are set or after 15 mins. ECONOMY: Soft operation to avoid excessive cooling/heating. Unit operates at slightly higher/lower temps. Displays . Cancels if other operations are set.

NIGHT SETBACK Operation

Maintains room temperature at approx. 10°C during absence or night for comfort. Press NIGHT SETBACK button to activate. Temperature settings cannot be changed. Recommended for unoccupied rooms. Cancels if other operations are set.

SILENT Operation

Reduces outdoor unit noise in 2 levels. Press SILENT button to activate. Maximum cooling/heating capacities may deteriorate. Not available in DRY/FAN modes. Resumes SILENT operation when unit turns on again after stop.

MENU Function

Accesses settings like Wireless LAN connection, Backlight, Display brightness, SELF CLEAN, Fan control in heating thermo-OFF, SILENT mode, and Wireless LAN communication. Use MENU switch and TEMP/TIMER buttons.

Wireless LAN Connection Setting

Refer to another user's manual. Poor communication may affect settings.

Backlight Setting

Turn backlight on/off. Select setting via MENU, then use TEMP/TIMER buttons to toggle on/off, then press ON/OFF to confirm.

Display Brightness Adjustment

Adjust display brightness. Select via MENU, use TEMP/TIMER buttons to set level (100%, 50%, 0%), then press ON/OFF.

SELF CLEAN Operation

Removes moisture from the indoor unit to control mold/bacteria. Run after AUTO, COOL, DRY. Select via MENU, then use TEMP/TIMER to turn on. Press ON/OFF to confirm. Runs for approx. 2 hours. RUN light blinks. Other operations cancel SELF CLEAN.

Fan Control in Heating Thermo - OFF

When heating reaches set temperature, thermostat turns off, but fan can continue circulating heat from other sources (Fireplace function). Other modes include Normal, Interval, and Stop functions. Settings are stored.

SILENT Mode Setting

Adjusts outdoor unit sound volume in 2 levels during SILENT operation. Select via MENU, use TEMP/TIMER to choose level (50, 51, 52), then press ON/OFF.

Wireless LAN Communication Setting

Switch wireless LAN communication ON or OFF. Select via MENU, use TEMP/TIMER to choose ON/OFF, then press ON/OFF. Setting is stored. If OFF, Wi-Fi is unavailable.

Initialization of Wireless LAN Setting

Resets wireless LAN settings to factory default. Stop unit, press OFF TIMER and 3D AUTO together for 5+ seconds. Then press ON/OFF for 5 seconds. Use CANCEL to cancel. Recommended when user changes or unit is disposed of.

PRESET Operation

How to Save

Save preferred settings (Mode, Temp, Fan Speed, Airflow) for future use. Press ON/OFF, select settings, press FAN SPEED "down" for 3+ seconds to save.

How to Start

Press FAN SPEED "up" for 3+ seconds to start saved PRESET operation. Canceled by 3D AUTO or HIGH POWER. Continues during ECONOMY.

Maintenance

Before Maintenance

Turn off power source.

During the Operational Season

Cleaning the Air Filter

Standard interval: every two weeks. Remove air filter by pulling up the air inlet panel. Clean filter with warm water (approx. 30°C) if very dirty. Do not use boiling water or dry over flame. Reinstall securely. Operating without filters can cause dust and damage.

Cleaning the Unit

Wipe with a soft, dry cloth or vacuum cleaner. Use a cloth soaked in warm water for heavy dirt.

Cleaning the Air Inlet Panel

The panel can be washed with water. Wipe dry out of direct sunlight.

How to open and close the air inlet panel

Open by placing thumbs on the lower part and pulling up. Close by pushing corners evenly.

How to remove and install the air inlet panel

Open panel 90 degrees, pull forward to remove. Install by inserting panel arm into slot, holding ends, lowering, and pushing until latched.

At the end of the season

Perform fan operation for 2-3 hours to dry unit. Stop unit and turn off power. Clean and reinstall filters. Clean indoor/outdoor units. Remove remote batteries.

At the beginning of the season

Ensure earth wiring is secure. Check for corrosion on outdoor unit base. Ensure no airflow obstructions. Turn on power source. Insert remote batteries.

Installing, Inspecting and Replacing the Air-Cleaning Filter

Remove air filters. Remove allergen clear filter (light orange), clean with vacuum. Replace if dirty or after 1 year. Install air-cleaning filter. Install air filters and close panel. CAUTION: Heat exchanger has sharp edges. Stand firmly on stepladder. Contact dealer for replacement filter.

Proper Installation

Suitable Installation Position

Ensure no obstruction to indoor unit ventilation. Avoid places with flammable gas or oil. Avoid corrosive environments (spas, seaside). Keep unit at least 1 meter from TV/radio. Ensure drain liquid drains well.

Pay Attention to Operating Noises

Choose a stable location to minimize noise/vibration. Use vibration-proof pads if necessary. Select a location that does not inconvenience neighbours with cold/hot air or noise. Ensure no obstacles near outdoor unit inlets/outlets. Contact dealer for irregular noises.

Inspection and Maintenance

Regular inspection and maintenance recommended for performance and longevity. Contact dealer for service (fee applies). Recommended during off-season. Damaged supply cords must be replaced by authorized repair shops.

Troubleshooting

Check power switch, timer settings, power failure/fuse, thermostat setting, filter cleanliness, open doors/windows, direct sunlight, heat sources, and room occupancy before calling for service. If issues persist, switch off power and contact dealer.

Notice

Airflow

HEATING OPERATION: Air not blown out or delayed blowing (5-15 mins) may occur due to warming up the indoor heat exchanger. RUN light blinks slowly. DRY OPERATION: Air may not be blown out. Indoor fan may stop to prevent re-evaporation of dehumidified moisture.

Noise

Gurgling sound: Refrigerant movement. Cracking sound: Heat expansion/contraction. Hissing/Clicking: Refrigerant control valves or electric components. Whistling: Compressor speed change. "Shooooo" sound: Another indoor unit stopped.

Operation

Timer functions set via wireless remote can be canceled by signals from wired remote or smartphone app. It is recommended to use only one timer type.

Others

Unit does not restart immediately: Restart blocked for 3 mins for protection. Steam release during COOL: May occur with high room temp/humidity; disappears as temp/humidity decrease. Close windows/doors. Slight smell: Caused by tobacco/cosmetics on unit. No auto-restart after power cut: Ensure auto-restart function is set. Remote signal issues: Avoid direct sunlight or bright light on the signal receiver. Moisture on grills: May form with long operation in high humidity. Fan not stopping: Indoor fan runs for 2 hours in SELF CLEAN. Outdoor fan stops for 1 min for protection. RUN light stays on: Illuminates during SELF CLEAN; turns off when complete.

Contact Your Dealer

Turn off power immediately and inform dealer if fuse blows continuously, cable gets hot, cable is cracked, TV/radio malfunctions, switch fails, strange noise occurs, or abnormalities persist after restart. Blinking RUN/TIMER lights or non-working lights indicate issues.

Auto Restart Function

Records operational status before power cut and resumes automatically after power is restored. Timer settings and HIGH POWER operations are canceled. Function is set ON by default; consult dealer to switch off. Timer settings are canceled by power failure and must be reset.

Self Diagnosis Function

The unit provides error codes indicated by RUN and TIMER light flashes:

EU DECLARATION OF CONFORMITY

Mitsubishi Heavy Industries Thermal Systems, Ltd. declares that the Split Type Air Conditioner (Model names: SRK Series Indoor Units, SRC Series Outdoor Units) conforms with EU directives like Machinery 2006/42/EC and applied standards EN 60335-1, EN 60335-2-40. Authorized representative in EU: MHIAE SERVICES B.V.

UK DECLARATION OF CONFORMITY

Mitsubishi Heavy Industries Thermal Systems, Ltd. declares that the Split Type Air Conditioner (Model names: SRK Series Indoor Units, SRC Series Outdoor Units) conforms with GB directives like Supply of Machinery Regulations S.I. 2008/1597 and applied standards EN 60335-1, EN 60335-2-40. Authorized representative in GB: 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), MHIAE SERVICES B.V. (Netherlands), and Mitsubishi Heavy Industries Air-Conditioners Australia, Pty. Ltd. are provided, including addresses, phone numbers, fax numbers, and websites.