Mitsubishi Heavy Industries Air Conditioner User Manual

Introduction

Thank you for choosing a MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. Air Conditioner. For the best and longest-lasting performance, please read and follow this user manual carefully before operating your air conditioner. After reading, keep it in a safe place. Please refer to it if you have questions about usage or if irregularities occur.

Your air conditioner may be marked with this symbol ♻️. This signifies that waste electrical and electronic equipment (WEEE, as per directive 2012/19/UE) should not be mixed with general household waste. Air conditioners must be treated at an authorized facility for reuse, recycling, and recovery, and not disposed of in the municipal waste stream. For more information, contact your installer or local authorities.

This symbol printed on the batteries installed in your air conditioner product is information for end-users according to EU Directive 2006/66/CE, Article 20, Annex II. Batteries, at the end of their useful life, must be disposed of separately from general household waste. If any chemical symbol is printed behind the chemical symbol shown above, that chemical symbol means the batteries contain heavy metal in a certain concentration. This will be indicated as follows: Hg: mercury (0.0005%), Cd: cadmium (0.002%), Pb: lead (0.004%). Dispose of batteries correctly at your local collection point or recycling center.

The noise level of each indoor and outdoor unit is below 70dB(A).

Safety Precautions

Before operating the system, please read these "Safety Precautions" in detail to ensure correct system operation. After reading this user manual, keep it for future reference. If you ever change users, ensure the manual is received by the new user.

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 personal injury or property damage.

Please observe these precautions carefully, as they are essential for your safety.

• This unit is designed for 2 types of refrigerants (R32 or R410A). Consult a label on the outdoor unit to check the refrigerant information.
• The symbols that frequently appear in the text have the following meanings:
• ? Strictly prohibited
• ✔️ Comply with instructions with utmost care
• ? Establish proper grounding.
• ? The user manual should be read thoroughly.
• Information is included in the user manual and/or installation manual.
• Service personnel should handle this equipment by referring to the installation manual.

The following precaution is only for R32:

This equipment uses flammable refrigerant. If there is a refrigerant leak in combination with an external ignition source, there is a possibility of ignition.

WARNING

• National laws must be strictly respected when disposing of the appliance.
• Do not use any means to accelerate the defrosting process or for cleaning other than those recommended by the manufacturer.
• The appliance should be stored in a well-ventilated area where the room size corresponds to the room area as specified for its operation.
• The personnel responsible for service operations must be qualified nationally or have a relevant similar qualification.
• The indoor unit should be stored in a room that has a minimum area of 4.0 m².
• ? Do not puncture or incinerate.
• Note that refrigerants may contain odors.

INSTALLATION PRECAUTIONS

WARNING

• The system is intended for domestic and residential use. If used in environments with harsh conditions, e.g., an engineering workshop, the equipment may perform poorly.
• The system must be installed by your vendor or a qualified installer. It is not recommended that you install the system yourself, as improper handling can cause water leaks, electric shock, or fire.

CAUTION

• Do not install the unit where flammable gases may leak. Such leaks can cause fires.
• Ensure that a ground fault interrupter switch is installed. Failure to install a ground fault interrupter may result in electric shock.
• Ensure the drain pipe is installed correctly so that water drains completely. Incorrect installation of this pipe may cause water to drip into the room, potentially wetting furniture.
• Ensure the system is properly grounded. The grounding wire should never be connected to a gas pipe, water pipe, lightning rod conductors, or the telephone grounding cable. Incorrect installation of the grounding wire can cause electric shock.

This product contains fluorinated greenhouse gases.

• Do not discharge R32 into the atmosphere: R32 is a fluorinated greenhouse gas with a Global Warming Potential (GWP) = 675.
• Do not discharge R410A into the atmosphere: R410A is a fluorinated greenhouse gas with a Global Warming Potential (GWP) = 2088.

Consult the nameplate of the outdoor unit for the amount of fluorinated greenhouse gas and its CO2 equivalent.

Operation Precautions

WARNING

• Children should not play with the air conditioner.
• Do not expose yourself to the cold airflow for prolonged periods. This cold may affect your physical condition and health.
• Children should not carry out user cleaning or maintenance without supervision.
• Do not insert anything into the air outlets. This could cause damage, such as affecting fan rotation at high speed.
• This air conditioner can be used by children aged 8 years and above and by persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge, if they are supervised or have been given instructions on how to use the air conditioner safely and understand the hazards involved.
• Keep the remote control out of the reach of children. Failure to do so may result in them swallowing batteries or other accidents.

CAUTION

• Use only approved fuses. Using a steel or copper wire instead of an approved fuse could cause a malfunction or fire.
• Do not handle switches with wet hands. This could cause electric shock.
• Do not hang or swing from the indoor unit. If the indoor unit falls, it could cause damage.
• Do not place any insecticide or flammable aerosol paint near the air conditioner or spray them directly onto the system. This could result in a fire.
• Do not expose any combustion appliance directly to the air conditioner's airflow. The appliance may not function correctly.
• Do not use for the preservation of food, plants, or animals, precision instruments, or works of art. The system is for use only in common domestic rooms. Any other use of the system may damage the quality of foodstuffs, etc.
• Do not place items containing water, such as glasses or vases, on the unit. If water enters the unit, it could damage the insulation and cause electric shocks.
• Do not install the air conditioner in a place where the airflow is directed straight at animals or plants. This could affect their health.
• Do not step on or sit on the unit, or place anything on top of it.
• Do not wash the air conditioner with water. This can cause electric shock. The use of high-pressure cleaning systems can damage the aluminum fins, reducing performance.
• If the unit falls or something falls from it, people could be injured. Periodically check the unit's support structure after a long period of use. If you do not repair any damage immediately, the unit may fall and cause personal injury.
• Do not touch the aluminum fins of the heat exchanger. Personal injury may occur.
• Do not place any electrical appliances or objects under the indoor or outdoor units. Condensation dripping from the unit can stain objects and cause accidents or electric shocks.
• Do not operate the system without the air filter. It may cause system malfunction due to obstruction of the heat exchanger and blockage of the drain pump.
• Do not disconnect the power immediately after stopping operation. Wait at least 5 minutes; otherwise, there is a risk of water leakage or malfunction.
• Do not control the system with the main power switch. It could cause a fire or water leakage. Furthermore, the fan may start unexpectedly, which could cause injury.
• Avoid spilling liquid on the unit or placing a water container on it. If water enters the unit, it could damage the insulation and cause electric shocks.
• If you operate the air conditioner together with a combustion appliance, ventilate the room regularly. Insufficient ventilation may cause accidents due to oxygen deficiency.
• When cleaning the air conditioner, stop the unit and disconnect the power. Never open the panel while the internal fan is rotating.
• Do not place objects near the outdoor unit or let leaves accumulate around it. If objects or leaves are around the outdoor unit, small animals could enter it and touch electrical components, causing malfunction, smoke, or fire.
• Contact your dealer to clean the internal components of the indoor unit. Do not attempt to do it yourself. Using an unapproved detergent or an improper cleaning method can damage the unit's plastic components and cause leaks. Damage, smoke, or fire may also occur if the detergent comes into contact with the motor's electrical components.
• If you hear thunder or there is a risk of lightning strikes, stop the unit and disconnect the power. This can damage the unit.
• If the power cable is damaged, contact your dealer or a qualified installer. If it is not replaced, it could cause a malfunction or fire.

Precautions for Relocation or Repairs

WARNING

• Do not perform any repairs or modifications. Consult with the unit supplier. Repairing or modifying the unit may cause water leaks, electric shocks, or fire.
• For repairs, consult your dealer. Incorrect repairs can cause electric shocks, fires, etc.
• If the air conditioner is relocated, contact your dealer or a qualified installer. Improper installation can cause water loss, electric shocks, fires, etc.
• If you detect any irregularity (burning smell, etc.), stop the system, disconnect the power, and consult your dealer. Continuous use of the system under abnormal circumstances may result in malfunction, electric shocks, fires, etc.
• If the air conditioner does not cool or heat the room, it may be due to a refrigerant leak. Contact your dealer. If refrigerant needs to be added, contact your supplier for appropriate instructions. If refrigerant comes into contact with the skin, it could cause a cold injury. If refrigerant gas is inhaled excessively, it may temporarily cause impairment of nerve function such as dizziness and headache, or impairment of heart function such as arrhythmia and palpitations. If an unexpected refrigerant leak falls on a heater, stove, iron, or other heat source, harmful gases could be generated.

Names of Each Part and Their Function

Indoor Unit

• Air Inlet: Where air is drawn in.
• Air Outlet: Blows air from here.
• Air Filter: Removes dust or dirt from the air inlet. (See page 25)
• Refrigerant Pipe and Electrical Cable Connection: Connection point for refrigerant lines and electrical wiring.
• Unit Display Section (Remote Control Signal Receiver): Receives signals from the remote control.
• Drain Hose: Drains water from the indoor unit.

Accessories

• Wireless Remote Control
• Wireless Remote Control Holder
• Wood Screw x 2 (for remote control holder mount)
• Battery x 2 (R03 (AAA, Micro))

Outdoor Unit

• Air Inlet (On the side and rear surface)
• Air Outlet
• Outdoor Unit Fan
• Heat Exchanger

Unit Display Section

• RUN Light (Green): Illuminates during operation. Flashes when airflow stops due to "HOT KEEP" and "CLEAN" mode operation. (See page 24 for timing)
• TIMER Light (Yellow): Illuminates during TIMER operation.
• HI POWER Light (Green): Illuminates during HIGH POWER operation. Flashes during heating preparation.
• ECONO Light (Orange): Illuminates during ECONOMY operation.
• Remote Control Signal Receiver: Receives signals from the remote control.
• Unit ON/OFF Button: This button can be used to turn the unit on/off when the remote control is not available. (See page 9)

Acoustic Signal for Remote Control: When 24°C temperature, AUTO operation, and AUTO airflow are selected, the unit emits an acoustic signal (PIPI). When the air conditioner is turned off by pressing the ON/OFF button (except in CLEAN mode), the unit emits an acoustic signal (PI). This function is practical when operating the air conditioner in the dark.

Airflow Adjustment: The unit cannot adjust airflow direction. (See page 13 for details on setting airflow direction).

Preset Temperature: Temperature setting.

Representative Installation Examples

Ceiling Recessed Installation (Side Air Outlet): Shows an indoor unit installed within a ceiling with air exiting from the side.

Ceiling Recessed Installation (Downward Air Outlet): Shows an indoor unit installed within a ceiling with air exiting downwards.

Diagrams show the remote signal receiver, air outlet, and air inlet grille for local placement.

Remote Control Operation

Battery Replacement Procedure

The following cases indicate depleted batteries. Replace depleted batteries with new ones:

• The signal reception sound is not emitted from the unit when the signal is transmitted.
• Display indications fade.

1. Remove the cover and take out the used batteries.
2. Insert batteries. R03 (AAA, Micro) x2. Pay attention to the polarity marks (+ and -).
3. Close the cover.
4. Press the ACL switch with the tip of a pen. (See page 12)

NOTE:

• Do not use old batteries together with new ones.
• Remove the batteries when the remote control will not be used for a prolonged period.
• The recommended battery life, according to JIS / IEC, should be 6-12 months with normal use. If used for an indeterminate time or longer than specified, there is a risk of batteries leaking, causing irreparable damage to the remote control.
• The recommended battery life is printed on the battery. This life may be shorter due to the unit's manufacturing time. However, the battery may still have sufficient charge after its expiration date.

When the display shows an abnormal state, press the ACL switch with the tip of a pen.

Using the Remote Control Holder

The remote control can be used separately from the wall using the remote control holder. In this case, install the remote control after verifying that the air conditioner receives the signal correctly. To install or remove the remote control, slide it upwards or downwards from the top of the holder.

Warning Notes on Remote Control Handling

• Do not place the remote control in places with high temperatures or near heating appliances.
• Do not place obstacles between the remote control and the unit's display area.
• ? Do not expose the remote control to direct sunlight or intense lighting.
• ? Do not pour any liquid onto the remote control.
• ? Do not drop the remote control. Be cautious.
• ? Do not place heavy objects on the remote control or step on it.

Remote Control Malfunction

• Are the batteries depleted? Refer to the "Battery Replacement Procedure" above. Replace batteries with new ones and try again.
• If the remote control fails, operate the unit with the temporary (emergency) operation function.

Contact your dealer to check the remote control.

Temporary (Emergency) Operation

The ON/OFF button located in the unit's display section controls temporary on/off operation when the remote control is not in use.

• Operation Mode: AUTO
• FAN SPEED: AUTO

Operation starts by pressing the unit's ON/OFF button, and stops by pressing it again.

NOTE: Do not hold down the ON/OFF button for more than 5 seconds. (Holding it down for more than 5 seconds will set the automatic cooling used during maintenance and when relocating the air conditioner.)

Installing Two Air Conditioners in the Same Room

If two air conditioners are installed in the same room, use this setting if the two units are not controlled by a single remote control. Adjust the remote control and the indoor unit.

Remote Control Adjustment

1. Remove the cover and extract the batteries.
2. Disconnect the switching line next to the batteries with pliers.

Indoor Unit Adjustment

1. Disconnect the power and reconnect it after 1 minute.
2. Point the remote control, previously configured as described to the left, towards the unit's display section and send a signal by pressing the ACL switch on the remote control.

Since the "pip" signal is sent 6 seconds after pressing the ACL switch, keep the remote control oriented towards the unit's display section for a while.

3. Insert the batteries. Close the cover.

3. Confirm that the "pip" reception sound is emitted from the indoor unit. Upon completing the adjustment, the indoor unit emits a "pip" sound. (If the reception sound is not emitted, repeat the adjustment from the beginning.)

Child Lock Protection

This function locks the remote control operation to prevent malfunction.

1. Press the SET button for 3 seconds or more. The ? symbol is displayed. While child lock is active, only the ON/OFF button can be operated.

Cancellation Procedure

Deactivate the indicator by pressing the SET button for 3 seconds or more.

NOTE: With child lock activated, temperature and fan speed settings cannot be changed.

Remote Control Operation and Display Section

• OPERATION MODE Selection Button: Pressing this button cycles through the modes. (See page 12, 14)
• TEMPERATURE Adjustment Button: This button adjusts the room temperature.
• HI/ECO Button (ON/ECO): This button alternates between HIGH POWER and ECONOMY modes. (See page 22)
• SILENT Button: This button switches to SILENT mode. (See page 23)
• ON TIMER Button: This button selects ON TIMER operation. (See page 16)
• OFF TIMER Button: This button selects OFF TIMER operation. (See page 15)
• NIGHT SETBACK Button: This button sets the NIGHT SETBACK mode. (See page 23)
• SET Button (Adjustment)/Child Lock: This button is used to adjust the timer and child lock. (See page 10)
• WEEKLY Button: This button activates and deactivates the Weekly Timer. (See page 18)
• CANCEL Button: This button cancels ON timer, OFF timer, and SLEEP operation.
• CLEAN Switch: This switch selects the CLEAN mode. (See page 24)
• SLEEP Button (Auto-off): This button selects SLEEP mode operation. (See page 15)

Transmission Section

• ON/OFF Button (Illuminated): Press to start the unit, press again to stop it.
• FAN SPEED Button: Pressing this button cycles through fan speeds. (See page 13)
• AIR FLOW Button (UP/DOWN): This button changes the airflow direction (up/down). This button is not used. (Airflow direction adjustment cannot be performed.) (See page 13)

Remote Display

• Display when off: Shows current time, day of the week, and operating mode when the air conditioner is off.
• TIMER Button: This button is used to set the current time and the timer function.
• PROGRAM Button: This button sets the Weekly Timer. (See page 18)
• ACL Switch: Switch to reset the microcomputer. (See page 9)
• TIME SET UP Switch: This switch is used for time setting. (See page 12)

Transmission Procedure: When pressing each button on the remote control, pointing the remote control towards the unit's display section, a signal is transmitted. When the signal is received correctly, you will hear a sound from the unit.

Reception Pip: A "pip" sound indicates successful signal reception.

Setting the Current Time

When batteries are inserted, the current time automatically enters the time setting mode. Monday and 13:00 are displayed as the current time. Set the day of the week and the time.

Example: Set to Saturday at 10:30.

1. Press the TIME SET UP switch. Press with the tip of a pen, etc. The day of the week flashes, indicating it can be adjusted.
2. Press the "◀ or ▶ (TIMER)" button. (Set to Saturday)
3. Press the SET button. The day of the week indicator changes from flashing to a steady light, completing the day of the week setting. The time indicator then flashes. Ensure you press the button within 60 seconds of the last operation in step 2, otherwise, the day of the week will not be set.
4. Press the "◀ or ▶ (TIMER)" button. (Set to 10:30)
5. Press the SET button. The time indicator changes from flashing to a steady light, indicating the setting is complete. Ensure you press the button within 60 seconds of the last operation in step 4, otherwise, the time will not be set.

NOTE:

• Timer operation is based on the internal clock, so you must set the time correctly.
• Remote control data will be reset when the current time is set.
• When the remote control batteries are changed or the ACL switch is pressed, the remote control returns to its initial state. As the Weekly Timer program is not set in the initial state, you must set the program according to the setting procedure.

AUTO (Automatic) Mode Operation

Operates by automatically selecting the operation mode (COOL, HEAT, DRY) depending on the ambient temperature upon startup.

1. Press the MODE button. The mode changes each time the button is pressed. Set to ? (AUTO).
2. Press the ON/OFF button.

NOTE: If no air comes out during operation. (See page 27)

To Stop: Press the ON/OFF button.

AUTO mode operation can be performed simply by pressing the ON/OFF button next time.

• If you do not wish to use AUTO mode, switch to COOL, HEAT, DRY, or FAN instead. (See page 14)
• Airflow direction adjustment procedure. (See page 13)

Temperature Adjustment During AUTO Operation

It is possible to adjust the air temperature even during automatic operation. There are 6 possible adjustment levels using the ⬆️ or ⬇️ button. During automatic operation, the preset temperature for both heating and cooling is 24°C.

1. Press the "◀ or ▶ (TIMER)" button.

When it's a bit cold: Press the ⬆️ button. Each time the button is pressed, the switch changes in the following order: -6, -5, ..., -1, ±0, +1, ..., +6. When +6 is indicated, even if the button is pressed, the indicator will not change.

When it's a bit hot: Press the ⬇️ button. Each time the button is pressed, the switch changes in the following order: +6, +5, ..., +1, ±0, -1, ..., -6. When -6 is indicated, even if the button is pressed, the indicator will not change.

Remote Control Display:

FAN SPEED (Fan Speed)

You can select the fan speed of your air conditioner as long as you are not in dry mode.

1. Press the FAN SPEED button. Each time the button is pressed, the fan speed changes.

NOTE: When changing FAN SPEED from Hi to Lo or ULo, you may hear the refrigerant flowing.

Airflow Direction Adjustment

Adjusting the airflow direction up/down. The direction of airflow cannot be adjusted, although the display will change if the "AIR FLOW" button is pressed.

COOL/HEAT/DRY/FAN Mode Operation

1. Press the MODE button. Set the desired mode. (❄️ Cool, ? Heat, ? Dry, ? Fan)
2. Press the ON/OFF button.
3. Press the TEMP button. Press the ⬆️ or ⬇️ button to adjust the desired temperature.
4. Press the FAN SPEED button. Adjust the fan speed as desired. Fan speed cannot be adjusted in Dry mode.

To Stop: Press the ON/OFF button.

NOTE:

• If no air comes out when starting heating mode operation. (See page 27)
• The operating mode can also be set or changed while the air conditioner is running.

Air Conditioner Operating Temperature Adjustment

Use the unit within the following operating range. If not, the protection device will activate, and the unit will not operate.

Prolonged use of the unit with humidity above 80% may cause condensation to form on the indoor unit's surface, leading to water leaks.

HEAT Mode Operation Characteristics

HEAT Mode Operating Mechanism and Capacity

Mechanism: The unit takes in cold outside air, heats it, and transfers it indoors, thus heating the environment. The heating capacity of the heat pump system decreases as the outdoor air temperature drops.

It may take some time after turning on the air conditioner before the unit starts supplying hot air.

If the outdoor temperature becomes extremely low, it is recommended to use an additional heating source.

Defrosting

If the outdoor temperature is low and the ambient humidity is high, the heat exchanger in the outdoor unit may freeze, preventing efficient heating. If this occurs, the automatic defrost function will activate, stopping heating mode operation for 5 to 15 minutes.

• Both the indoor and outdoor fans stop, and the RUN light flashes slowly (1.5 sec ON, 0.5 sec OFF) during defrosting.
• The outdoor unit may emit some steam during this operation. This is to aid the defrosting process and is not a defect.
• HEAT operation resumes as soon as defrosting is complete.

SLEEP TIMER (Auto-off) Operation

The unit will automatically stop after the preset time has elapsed. The preset temperature is automatically adjusted according to the elapsed time to prevent excessive cooling or heating. (See page 17)

1. Press the SLEEP button.

If pressed while the unit is off: SLEEP TIMER (AUTO-OFF) mode starts with previous operating settings, and the air conditioner will turn off after the preset time.

If pressed while the unit is running: The air conditioner will turn off after the preset time.

Each time this button is pressed, the display changes as follows:

... (Hour units) ? Without indicator (canceled)

Example: You prefer the unit to stop after 7 hours.

Set to 7 hours. The TIMER light (yellow) will be lit.

Changing the Time Setting

Set a new time by pressing the SLEEP button.

Cancellation Procedure

Press the CANCEL button to deactivate the SLEEP (Auto-off) indicator.

NOTE: The unit stops after the set time has elapsed. It cannot be set concurrently with OFF-TIMER mode.

OFF TIMER (Shutdown Timer) Operation

The unit automatically stops when the set time is reached.

If the air conditioner is off, start from step 1. If the air conditioner is running, start from step 2.

Example: You want the unit to stop at 22:30.

1. Press the ON/OFF button.
2. Press the OFF TIMER button. The OFF TIMER indicator will flash.
3. Press the "◀ or ▶ (TIMER)" button. Each time the button is pressed, the display changes in the following order: 0:00, 0:10, 0:20, ..., 1:00, 1:10 (Ten-minute units). Each time the button is pressed, the display changes in the following order: 0:00, 23:50, 23:40, ..., 23:00, 22:50 (Ten-minute units).
4. Set to 22:30.
5. Press the SET button. The display changes from flashing to a steady light, and the setting is complete. The timer light (yellow) turns on.

Changing the Time Setting

Set a new time using the OFF TIMER button.

Cancellation Procedure

Press the CANCEL button to turn off the timer display.

NOTE:

• The unit stops operation at the set time.
• Ensure you press the button within 60 seconds of the last operation in step 3, otherwise, the setting will not be completed.
• The current time is not displayed during OFF TIMER mode operation.
• Unlike SLEEP TIMER operation, automatic temperature adjustment does not occur during OFF TIMER mode.

ON TIMER (Startup Timer) Operation

The unit starts operation 5 to 60 minutes before the set time so that the room temperature has reached its optimal point by that time. ON TIMER operation can be configured regardless of whether the air conditioner is operating or not. (See page 17)

Example: If you want the desired room temperature to be reached by 8:00.

1. Press the ON TIMER button. The ON TIMER indicator will flash.
2. Press the "◀ or ▶ (TIMER)" button. Each time the button is pressed, the display changes in the following order: 0:00, 0:10, 0:20, ..., 1:00, 1:10 (Ten-minute units). Each time the button is pressed, the display changes in the following order: 0:00, 23:50, 23:40, ..., 23:00, 22:50 (Ten-minute units).
3. Set to 8:00.
4. Press the SET button. The display changes from flashing to a steady light, and the setting is complete. The timer light (yellow) turns on. The unit stops if the ON time is set while it is running.

Changing the Time Setting

Set it to a new time using the ON TIMER button.

Cancellation Procedure

Press the CANCEL button to deactivate the timer indicator.

NOTE:

• Operation starts 5 to 60 minutes before the set time.
• The timer light (yellow) turns off at the programmed time.
• Ensure you press the button within 60 seconds of the last operation in step 2, otherwise, the setting will not be completed.
• The current time is not displayed during ON TIMER mode operation.
• If the ON/OFF button is pressed after setting the ON TIMER, the setting will be canceled.

SLEEP TIMER + ON TIMER Mode Operation

Combined operation of SLEEP TIMER and ON TIMER modes.

Example: You want the unit to stop after 3 hours and then restart, reaching the preset temperature by 8:00.

1. SLEEP TIMER Mode Setting: Configure using the procedures on page 15.
2. ON TIMER Operation Configuration: Configure according to the procedure in the ON TIMER section.

Set to desired times. The timer light (yellow) setting for this unit has been performed.

After the set time in SLEEP TIMER mode elapses, the unit stops and restarts 5 to 60 minutes before the ON TIMER time.

The timer light turns off when the ON TIMER time is reached.

Changing the Time Setting

Set a new time using the SLEEP or ON TIMER button.

Cancellation Procedure

Press the CANCEL button to turn off the timer display.

ON TIMER (Startup Timer) + OFF TIMER (Shutdown Timer) Mode Operation

Combination of timer settings for ON TIMER and OFF TIMER modes.

Example: Current time is 21:00. The air conditioner is running. You want the unit to stop at 23:30 and then restart, reaching the preset temperature by 8:00.

1. OFF TIMER Operation Adjustment: Perform the adjustment according to the procedure on page 15. Set to 23:30.
2. ON TIMER Operation Adjustment: Perform the adjustment according to the procedure on page 16. Set to 8:00.

NOTE: Timer operation can only be set for the next 24 hours.

The timer light (yellow) on the unit's display section will illuminate when the setting is complete. The set time will be displayed on the remote control. The indicator will change according to the operating status.

• The air conditioner is stopped. First, the air conditioner turns on with the ON TIMER. Then, the air conditioner turns off with the OFF TIMER.
• The air conditioner is running. First, the air conditioner turns off with the OFF TIMER. Then, the air conditioner turns on with the ON TIMER.

Changing the Time Setting

Set a new time using the OFF TIMER button or the ON TIMER button.

Cancellation Procedure

Press the CANCEL or ON/OFF buttons to turn off the timer display.

Comfort Start

In ON TIMER mode, the unit starts a little earlier so the room can approach the optimal temperature by the start time. This is called "Comfort Start".

• Mechanism: The room temperature is checked 60 minutes before the start time. Depending on the ambient temperature at that time, operation starts 5 to 60 minutes in advance.
• Operation:
• Cooling Operation (Stop): Starts operation.
• Temperature Setting: (Operation)
• Ambient Temperature Check:
• Advance Setting: 60 min. before.

The function is available in COOL and HEAT modes (including AUTO). It does not act in DRY mode.

SLEEP TIMER (Auto-off Timer)

When SLEEP TIMER mode is selected, the set temperature is automatically adjusted after a while, ensuring the room is not too cold during cooling or too hot during heating.

• During cooling: The preset temperature is lowered by 1°C at the start of SLEEP (Auto-off) operation (when the timer is active). After that, the temperature rises by 1°C every hour until it is 1°C above the programmed temperature.
• During heating: The preset temperature is lowered by 1°C at the start of SLEEP (Auto-off) operation (when the timer is active). After that, the temperature drops by 3°C in one hour and 6°C in two hours, below the programmed temperature.

Weekly Timer Operation

Up to 4 timer programs (ON-TIMER/OFF-TIMER) can be set for each day of the week. Up to 28 programs are available. Once set, the timer will repeat with the same programs every week, unless the Weekly Timer is canceled.

Example (with cold weather):

• ⚙️: Weekly Timer Setting
• ?: MANUAL Setting

The diagram shows various ON/OFF settings for different modes (COOL, DRY) across days of the week.

Weekly Timer ON/OFF Setting

Activate and deactivate the Weekly Timer with the WEEKLY button.

1. Press the WEEKLY button. The Weekly Timer enters operation. Each time the WEEKLY button is pressed, the indicator changes in the following order:

? Without indicator (Weekly Timer activated) ?? (Weekly Timer deactivated)

NOTE: When WEEKLY TIMER is ON, the timer light (yellow) on the unit display section will be lit. When the remote control batteries are changed or the ACL switch is pressed, the remote control returns to its initial state. As the Weekly Timer program is not set in the initial state, you must set the program according to the setting procedure.

• The Weekly Timer is activated and deactivated independently of whether the air conditioner is running or not.
• The ON-TIMER mode of the Weekly Timer is effective regardless of whether the air conditioner is running or not. When the ON-TIMER time is reached, the remote control operates according to the set values. The remote control indicator also displays the set values. The setting can be changed from the remote control after the Weekly Timer ON-TIMER mode is activated. The following settings can be made with the ON-TIMER: Operating mode, fan speed, temperature, ECONOMY, NIGHT SETBACK, SILENT. Comfort start is not executed in the Weekly Timer ON-TIMER mode.
• The OFF-TIMER mode of the Weekly Timer is effective only when the air conditioner is running. When the OFF-TIMER time is reached, the air conditioner stops.
• When multiple program numbers are set for the current day (day of the week), operation starts from the first set time.
• When several timers are active (ON-TIMER, OFF-TIMER, and SLEEP TIMER), the Weekly Timer does not operate even if the ON-TIMER or OFF-TIMER time is reached. The Weekly Timer starts operating after the various timers have finished.
• An ON-TIMER and an OFF-TIMER cannot be set for the same time on the same day of the week.
• If the WEEKLY TIMER has not been sent from the remote control, the TIMER light will not be on even if the WEEKLY button is pressed and it appears on the remote control.

Mode Setting

Set after establishing the day of the week and time.

1. Press the PROGRAM button. The current day and ⚙️ flash.
2. Press the "◀ or ▶ (TIMER)" button. Select a day of the week to reserve. Each time the button is pressed, the display changes in the following order: Mon, Tue, Wed, ..., Sun. It shows all days of the week. Each time the button is pressed, the display changes in the following order: Mon, Sun, Sat, ..., Tue. It shows all days of the week.
3. Press the SET button. The day of the week is selected, and the program number flashes.
4. Press the "◀ or ▶ (TIMER)" button. Select a program number. Each time the button is pressed, the display changes in the following order: P1, P2, P3, P4. Each time the button is pressed, the display changes in the following order: P1, P4, P3, P2.
5. Press the SET button. When adjustment values (ON-TIMER or OFF-TIMER) are not available, the timers ⚙️ and ⏰ flash. When adjustment values (ON-TIMER or OFF-TIMER) are available, ⚙️ or ⏰ illuminates.
6. Press the ON-TIMER or OFF-TIMER button. ON-TIMER or OFF-TIMER is set, and the time indicator flashes. ON-TIMER is selected. OFF-TIMER is selected.
7. Press the "◀ or ▶ (TIMER)" button. Set the time. Each time the button is pressed, the display changes in the following order: 0:00, 0:10, 0:20, ..., 1:00, 1:10 (Ten-minute units). Each time the button is pressed, the display changes in the following order: 0:00, 23:50, 23:40, ..., 23:00, 22:50 (Ten-minute units). With ON-TIMER selected, proceed to Step 8. With OFF-TIMER selected, proceed to Step 9.
8. Set the adjustment values as needed. If ON-TIMER is selected, the operating mode and fan speed can be changed, and ECONO, SILENT, or NIGHT SETBACK modes can be set.
9. Press the SET button. The time is set, and ⚙️ and ⏰ flash.
10. Press the PROGRAM button or the SET button. When the PROGRAM button is pressed, the setting is sent to the air conditioner. Transmission takes 3 seconds, so keep the remote control pointed towards the unit's display section during this period. When the setting is received, a "pip, pip, pip" sound is emitted. When the SET button is pressed, the setting continues from Step 2.

Mode Setting

Set the same adjustment values to the same program number for all days of the week. In Step 2 above, select "all days of the week". If individually adjusted values already exist for that same program number, the values will be overwritten.

NOTE: If no operation is performed for 60 seconds in the adjustment mode, the adjustment changes made so far are canceled, and the adjustment mode ends. Subsequently, all program numbers (P1, P2, P3, and P4) flash for 10 seconds. (This flashing cannot be observed if the adjustment mode ends while adjusting a single program).

Upon completion of the adjustment mode, point the remote control towards the unit's display section and press the PROGRAM button. In this case, confirm that the air conditioner emits a "pip, pip, pip" reception sound three times. If the sound is not emitted, enter the adjustment mode again by pressing the PROGRAM button and confirm that the sound is emitted.

How to Cancel Setting

1. Press the PROGRAM button. The current day and ⚙️ flash.
2. Press the "◀ or ▶ (TIMER)" button. Select a day of the week to cancel.
3. Press the SET button. The day of the week is selected, and the program number flashes.
4. Press the "◀ or ▶ (TIMER)" button. Select a program number to cancel. During cancellation operation, do not press the SET button. If the SET button is pressed, it proceeds to the SET mode.
5. Press the CANCEL button. The ON-TIMER and OFF-TIMER setting contents are canceled and displayed in the time indication section.
6. Press the PROGRAM button. When the PROGRAM button is pressed, the setting is sent to the air conditioner. When the setting is received, a "pip, pip, pip" sound is emitted. The setting contents for each program are canceled. Perform the operation indicated above for each program you wish to cancel.

How to Cancel Setting

When the same adjustment values exist for the same program number for all days of the week, collective deletion is permitted. In Step 2 above, select "all days of the week". The procedure in Step 3 is the same as indicated above. If the adjustment values have been changed or deleted by individual adjustment after the collective adjustment described on page 20, discrepancies in adjustment values between days of the week are created, making collective deletion not permitted.

Confirmation Mode

The Weekly Timer setting contents can be confirmed.

1. Press the PROGRAM button for 3 seconds or more. ⚙️ flashes and the adjustment value is illuminated.
2. Press the "◀ or ▶ (TIMER)" button. The indicator starts from the current day of the week. - is displayed for programs without settings. When the PROGRAM button is pressed in Confirmation mode, it switches to adjustment mode.

Mon P1 P2 P3 P4

Tue P1 P2 P3 P4

Sun P1 P2 P3 P4

Shows all days of the week P1 P2 P3 P4

Cancellation Procedure

Confirmation mode can be exited by pressing the ON/OFF, CANCEL, or SET button.

NOTE: If no operation is performed for 60 seconds in Confirmation mode, it terminates.

HIGH POWER/ECONOMY Mode Operation

1. Press the ON/OFF button.
2. Press the HI/ECO button.

When the operation mode is AUTO, COOL, or HEAT: Each time the HI/ECO button is pressed, the display changes in the following order:

? (High Power) ? (ECONOMY) ? (Normal Operation)

When the operation mode is DRY or ON-TIMER + OFF-TIMER: Each time the HI/ECO button is pressed, the display changes in the following order:

? (ECONOMY) ? (Normal Operation)

HIGH POWER Mode

Pressing the HI/ECO button intensifies the operating power and starts a powerful cooling or heating operation for 15 consecutive minutes. The remote control displays the indication, and the FAN SPEED indication disappears.

NOTE:

• During HIGH POWER operation, the room temperature is not controlled. If this operating mode causes excessive cooling or heating, press the HI/ECO button again to cancel HIGH POWER mode.
• HIGH POWER mode is not available with DRY and ON-TIMER + OFF-TIMER modes.
• With HIGH POWER mode set after setting the ON-TIMER, it will switch to HIGH POWER mode at the set time.
• After HIGH POWER operation, you may hear the sound of refrigerant flow.
• HIGH POWER mode operation will be canceled when any of the following operations are performed:
• 1. When the HI/ECO button is pressed again. (The operating mode will change to ECONOMY mode).
• 2. When the operation mode is changed.
• 3. When 15 minutes have passed since the start of HIGH POWER operation.
• 4. When the SILENT button is pressed.
• 5. When the NIGHT SETBACK button is pressed.
• Does not operate while the air conditioner is OFF.

ECONOMY Mode

Pressing the HI/ECO button initiates a gentle operation, with power reduced to prevent excessive heating or cooling. The unit operates 1.5°C above the set temperature during cooling, or 2.5°C below it during heating. The ? symbol appears on the remote control, and the FAN SPEED indication disappears.

NOTE:

• The next time the air conditioner starts, it will enter ECONOMY mode if the following cases occur:
• 1. If the air conditioner is stopped by the ON/OFF button during ECONOMY mode.
• 2. When the air conditioner stops while in SLEEP or OFF TIME modes while operating in ECONOMY mode.
• 3. When the unit operation resumes from CLEAN modes.
• ECONOMY mode operation will be canceled when any of the following operations are performed:
• 1. When the HI/ECO button is pressed again.
• 2. When the operation mode is changed from DRY to FAN.
• 3. When the NIGHT SETBACK button is pressed.
• Does not operate while the air conditioner is OFF.

NIGHT SETBACK (Night Comfort) Mode Operation

During cold weather, the room temperature can be maintained at a pleasant level when no one is home, during the night, or when the room is empty. The air conditioner maintains the temperature at approximately 10°C.

1. Press the NIGHT SETBACK button. Each time the NIGHT SETBACK button is pressed, the display changes in the following order:

? (NIGHT SETBACK activated) ?? (NIGHT SETBACK deactivated)

Cancellation Procedure

Press the NIGHT SETBACK button or the MODE button to deactivate the NIGHT SETBACK indicator.

NOTE:

• In NIGHT SETBACK mode, the air conditioner maintains the temperature at approximately 10°C.
• In NIGHT SETBACK mode, temperature adjustments cannot be made.
• As room temperature can vary greatly, this mode is recommended for when the room is unoccupied.
• In NIGHT SETBACK mode, HIGH POWER and ECONOMY modes cannot be selected.
• When NIGHT SETBACK mode is canceled by pressing the NIGHT SETBACK button, the operating mode reverts to the mode immediately prior to entering NIGHT SETBACK.

SILENT Mode Operation

When SILENT mode is set, the unit operates more quietly, i.e., it reduces the noise from the outdoor unit. If the air conditioner is off, start from step 1. If the air conditioner is running, start from step 2.

1. Press the ON/OFF button.
2. Press the SILENT button.

When the operation mode is AUTO, COOL, HEAT, or NIGHT SETBACK: Each time the NIGHT SETBACK button is pressed, the display changes in the following order:

? (SILENT activated) ?? (SILENT deactivated)

Cancellation Procedure

Press the SILENT button to deactivate the SILENT indicator.

NOTE:

• During SILENT mode, heating or cooling will not be maximized.
• SILENT mode will not operate with DRY or FAN modes activated.
• For the following modes, the conditioner will return to SILENT mode when turned on again:
• 1. When the air conditioner is stopped by the ON/OFF button during SILENT mode.
• 2. When the air conditioner stops in SLEEP or OFF-TIMER modes during SILENT mode.
• 3. When unit operation resumes from CLEAN modes.
• Does not operate while the air conditioner is OFF.
• The outdoor unit's noise level may not decrease, depending on the case.
• For the SCM multi-system, the SILENT control function is not valid.

SELF CLEAN Mode Operation

CLEAN operation should be executed after AUTO, COOL, and DRY operation to remove moisture from inside the unit and control the growth of mold and bacteria.

1. To activate CLEAN mode, press the CLEAN switch with the tip of a pen.

Each time the CLEAN switch is pressed, the display changes in the following order:

? (CLEAN activated) ?? (CLEAN deactivated)

NOTE:

• Two hours later, the air conditioner automatically stops CLEAN mode. To stop the air conditioner immediately, press the ON/OFF button.
• CLEAN mode will not activate after the unit has been operating in HEAT and FAN, OFF-TIMER, SLEEP modes.
• The indoor unit fan operates for about two hours during CLEAN operation.
• The RUN light will illuminate during CLEAN operation. (Timing: 3 sec ON, 1 sec OFF)
• Press the SLEEP button or the NIGHT SETBACK button during CLEAN mode to cancel it. The unit then switches to SLEEP or NIGHT SETBACK mode.
• This is not a function to remove mold, germs, or dirt that are already adhered to the unit.

Auto Restart Function

What is the Auto Restart Function?

The auto restart function records the operating state of the air conditioner immediately before it turns off due to a power failure, and automatically restores its functions after the power supply has been recovered.

The following settings will be canceled:

1. Timer settings
2. HIGH POWER operations

NOTE: The auto restart function is activated when the air conditioner leaves the factory. Consult your dealer if you wish to deactivate this function.

If a power failure occurs, the timer programming is canceled. When power is restored, you will need to reprogram the timer again.

Tips for Effective Operation

To operate your unit comfortably and economically. Please consider the following:

• Set a pleasant ambient temperature. Excessively high or low temperatures are not good for your health and waste electricity.
• Adjust airflow direction correctly according to the operation instructions for the local placement part. Adjust the airflow up/down and left/right to achieve an even ambient temperature. The unit cannot perform left/right airflow direction adjustment.
• Clean the filters frequently. Clogged filters can block airflow and lead to reduced operating efficiency. Ask a specialized technician to clean the air filter.
• Operate the unit only when needed. Make good use of the timer to operate the unit only when necessary.
• Avoid direct exposure to sunlight and airflow. During cooling, reduce sunlight using curtains or screens. Keep windows and doors closed, except when ventilating.
• Keep heat sources away when trying to cool a room. Keep heat sources out of the room as much as possible.

Maintenance

Before Maintenance

• Disconnect the power supply.
• Do not spill any liquid. You risk electric shock.
• Clean the unit with a soft, dry cloth.
• Do not touch the aluminum fins of the heat exchanger.
• Do not use the following items:
• Hot water (40°C or more) - This could deform or discolor the unit.
• Gasoline, solvent, benzine, or cleaners, etc. - All of them could deform or scratch the unit.

During Operation Period

Cleaning the air filter. Ask a specialized technician to clean the air filter.

NOTE: The air filter that comes with the unit cannot be washed with water. When the air filter is clogged with dust, etc., the cooling and heating capacity is affected, operating noise increases, and energy is wasted. Therefore, clean the filter regularly and correctly.

At the End of the Season

1. Run the fan for 2-3 hours. This dries the inside of the unit.
2. Turn off the unit and disconnect the power supply. The unit consumes approximately 2 W even when not in operation. Disconnecting the power saves energy and reduces your consumption and expenses.
3. Clean and reinstall the air filters. (The air filter that comes with the unit cannot be washed with water.)
4. Remove the batteries from the remote control.

At the Beginning of the Season

1. Ensure the grounding wire is not pinched or disconnected.
2. Check for corrosion or rust on the outdoor unit frame.
3. Ensure there are no obstacles blocking airflow around the air inlet and outlet openings of the indoor and outdoor units.
4. Connect the power supply.
5. Insert the batteries into the remote control.

Correct Installation

Proper Installation Position

• Do not place any object in front of the indoor unit that would impede its proper ventilation and operation.
• Do not install the unit in any of the following locations:
• Where there is a risk of flammable gas leakage.
• Risk of splashing with petroleum and its derivatives.
• In cases where the unit is used in places like spas, where sulfur gases are generated, or in districts exposed to sea breezes, corrosion may cause damage. Consult your dealer.
• The air conditioner body and the remote control should be more than 1 meter away from other appliances such as televisions, radios, etc.
• The drainage of accumulated water from condensation inside the unit must be drained to the correct location.

Also Pay Attention to Operating Noises

• When installing the unit, choose a location that can support the unit's weight and where it is fixed, and does not produce noise or vibration during operation. If vibrations are transmitted through the house, fix the unit by placing anti-vibration rubber pads between the unit itself and the anchors.
• Choose a location where the cold or hot air, as well as noises from the indoor and outdoor units, do not cause any disturbance to your neighbors.
• Items near the air inlet or outlet of the indoor unit can cause damage or increase operating noise. Do not leave obstacles near the air inlet or outlet.
• If you hear an irregular sound during operation, consult your dealer.

Inspection and Maintenance

Depending on the unit's environment, the inside of the air conditioner can become quite dirty after a few years of operation. This will reduce its performance. In addition to normal cleaning, we recommend performing inspections and maintenance on the appliance. (This can make the air conditioner have a longer trouble-free lifespan.)

• For inspection and maintenance, consult your dealer or a sales office of distribution companies. (Service charge may apply in this case.)
• We recommend performing inspection and maintenance during seasons when the unit is not used.
• If the unit's supply cable is damaged, it must only be replaced by a repair center authorized by the manufacturer, as special tools must be used for this purpose.

Troubleshooting

Please check the following before requesting after-sales service from your dealer.

The air conditioner does not operate correctly.

• Is the switch disconnected?
• Is the timer set to ON?
• Is there a power failure or is the fuse blown?

If the air conditioner does not operate correctly after checking the points above, if doubt persists after consulting page 27, or if any of the conditions described on page 28 occur, interrupt the power supply or contact your dealer.

Poor Cooling or Heating

• Is the ambient temperature set as desired? (Pleasant temperature)
• Are the air filters clean (not clogged)?
• Are windows or doors open?
• Is sunlight directly entering the room?
• Poor Cooling: Is there any heat source in the room? Are there many people in the room?

Notice

Airflow

• No air comes out when starting heating mode. The RUN lamp flashes slowly (1.5 sec ON, 0.5 sec OFF). Air is stopped for 2 to 5 minutes to prevent cold air from blowing out until the heat exchanger warms up. (HOT KEEP program).
• No air comes out during heating mode for 5 to 15 minutes, or the air that comes out is not hot. The RUN lamp flashes slowly (1.5 sec ON, 0.5 sec OFF). When the outdoor temperature is low and humidity is high, the unit sometimes performs defrosting automatically. Please wait. During defrosting, you may hear water running inside the unit. The outdoor fan sometimes stops to prevent moisture evaporation and save energy.
• No air comes out when starting DRY (dehumidification) mode. (The RUN light is illuminated.) The fan stops blowing air to prevent blowing out cold air until the heat exchanger has warmed up. (2 to 5 min.) (HOT KEEP program).

Noise

• Sounds like running water are heard. This is the sound produced by the liquid (refrigerant) circulating inside the unit.
• Sounds like cracking are heard. This is caused by the expansion or contraction of plastics.
• A hissing or clicking sound is heard. This is caused by the operation of refrigerant control valves or electrical components.
• A whistling sound from the outdoor unit is heard. This noise indicates that the compressor's rotation speed is increasing or decreasing.
• A sound like "shooooo" is occasionally heard for a brief period when the unit is turned off. This sound is produced when operation of another indoor unit is stopped.

Others

• The unit does not restart immediately after you have stopped it. (The RUN light is illuminated). As a protective measure, the unit restart is blocked for 3 minutes after it has been stopped. Please wait three minutes. The microcomputer's 3-minute protection timer restarts the unit automatically.
• Does not operate? If the auto restart function is not set, the unit will not restart automatically. Operate the remote control again to restart operation.
• Mist comes out during COOL operation. The air blown during operation may have a particular odor. This is caused by tobacco or cosmetics that have permeated the unit.
• Bad odor comes from the unit. The air produced during operation may have a particular odor. This is caused by tobacco or cosmetics that have permeated the unit.
• After a power failure, the unit does not restart even though power has been restored. If the auto restart function is not set, the unit will not restart automatically. Operate the remote control again to restart operation.
• Remote control signals are not received. Remote control signals may not be received if the unit's display area is exposed to direct sunlight or other bright lights. In this case, block the sunlight or reduce the lighting.
• Moisture forms on the air outlet grilles. If the unit has been operating for a long period with high humidity, moisture may form on the air outlet grilles and drip.
• The fan does not stop immediately after stopping unit operation. Indoor fan: The fan will not stop for about 2 hours if set to CLEAN operation. Outdoor fan: The fan will not stop for approximately 1 minute to protect the unit.
• The RUN light remains on even though operation has stopped. The RUN light illuminates during CLEAN operation. The RUN light turns off when CLEAN operation is finished.

Contact Your Dealer

Immediately turn off the power supply and inform your dealer in any of the following situations:

• Fuses or plug often burnt. Fuse blown.
• The power supply cable is excessively hot. The power cable cover is broken.
• PRECAUTION: If the power cable is damaged, consult your dealer or a qualified engineer to install the replacement to avoid accidents.
• Damage is observed on the television, radio, or other electronic appliances.
• The switch does not act reliably.
• Abnormal noises are heard during operation.

Contact your dealer when foreign objects enter the indoor unit through the air outlets and the airflow regulator stops functioning.

The RUN and TIMER indicator lights in the unit display section flash rapidly (0.5 sec ON; 0.5 sec OFF), and the appliance does not operate.

If irregularities occur, disconnect the power immediately and reconnect it after 3 minutes. After restarting operation with the remote control's ON/OFF button, the anomalies continue.

About Multiple Air Conditioners

Simultaneous Operation

• Air conditioners cannot be in different operating modes at the same time, e.g., one unit in "Cool" mode and another in "Heat" mode.
• When different operations are performed, the air conditioner that was put into operation first will have priority, so the unit started later will perform the blowing operation.
• If you want the unit started second to have priority, stop the unit that has priority or make the operation mode of the first unit the same as the second unit.
• When indoor units are operating in different modes, the RUN light will illuminate. (Timing: 0.5 sec ON, 0.5 sec OFF)

Automatic Operation

• When the remote control operation switch is set to "AUTO," the air conditioner automatically selects "COOL," "DRY," or "HEAT" when operation starts, depending on the room temperature.
• During simultaneous operation of air conditioners, operating modes may automatically change in response to the temperatures of each room; this may result in the outdoor unit stopping. In such cases, COOL or HEAT modes should be used instead of AUTO. (This feature only applies when using more than one air conditioner.)

Refrigerant (Oil) Recovery Operation

• If indoor units have not been used simultaneously for a prolonged period, the performance of heating and cooling processes may temporarily decrease. This measure is intended to control the refrigerant (oil) recovery in indoor units that have been inactive. During this process, you may hear the sound of refrigerant flow in those units.

Self-Diagnosis Function

We constantly strive to improve service for our customers by installing elements to better observe abnormalities of each function as follows: