Mitsubishi Heavy Industries Air-Conditioner User's Manual

Safety Precautions

Please read these safety precautions carefully to ensure proper operation of the system.

WARNING

• The system is for domestic and residential use.
• The system must be installed by your dealer or a qualified installer.
• Children shall not play with the air-conditioner.
• Do not expose yourself to the cooling air for a long period.
• Do not insert anything into the air outlet.
• Do not touch the aluminum fins on the heat exchanger.
• Do not place household electrical appliances or household items underneath the indoor or outdoor units.
• Do not operate the system without the air filter.
• If you operate air-conditioner together with a combustion appliance, you must regularly ventilate the indoor air.
• When you clean air-conditioner, stop the unit and turn off the power source. Never open the panel while the internal fan is rotating.
• Do not place objects near the outdoor unit or allow leaves to gather around the unit.
• Do not shut off the power source immediately after stopping the operation.
• Do not control the system with main power switch.
• Do not pour liquid into the unit and do not put water container on the unit.
• Contact your dealer to clean inside the indoor unit, do not attempt to do by yourself.
• Stop the unit and turn off the power if you hear thunder or there is a danger of lightning.
• If the power cable becomes damaged, contact your dealer or a qualified installer.

CAUTION

• Do not install it where flammable gas may leak.
• Make sure that an earth leakage breaker is installed.
• Make sure to install the drain hose properly so that all the water is drained out.
• Make sure that the system has been properly earthed.
• Use of steel or copper wire instead of an approved fuse is strictly prohibited.
• Do not handle the switches with wet hands.
• Do not swing from the indoor unit.
• Do not place a flammable insecticide or paint spray near the air-conditioner, nor spray it directly on the system.
• Do not expose any combustion appliance directly to the air stream of the air-conditioner.
• Do not wash the air-conditioner with water.
• Do not use for preservation of food, plants or animals, precision devices or works of art.
• Do not place anything containing water, like vases, on top of the unit.
• Do not install the air-conditioner where the airflow direction is aimed directly at plants or animals.
• Do not step/sit on the unit nor put anything on it.
• After a long period of use, check the unit's support structure regularly.

Symbols

• Strictly prohibited ?
• Observe instructions with great care ⚠️
• Provide proper earthing ?
• The user's manual should be read carefully. ?
• There is information included in the user's manual and/or installation manual. ℹ️
• A service personnel should be handling this equipment with reference to the installation manual. ?️

Installation Precautions

• The system is for domestic and residential use.
• The system must be installed by your dealer or a qualified installer.
• Do not install it where flammable gas may leak.
• Make sure that an earth leakage breaker is installed.
• Make sure to install the drain hose properly so that all the water is drained out.
• Make sure that the system has been properly earthed.

Operation Precautions

• Children shall not play with the air-conditioner.
• Do not expose yourself to the cooling air for a long period.
• This air-conditioner can be used by children aged from 8 years and above and people with reduced physical, sensory or mental capabilities or lack of experience and knowledge, if they have been given supervision or instruction concerning use of the air-conditioner in a safe way and understand the hazards involved.
• Store the remote control out of reach of children.
• Only use approved fuses.
• Do not handle the switches with wet hands.
• Do not swing from the indoor unit.
• Do not place a flammable insecticide or paint spray near the air-conditioner, nor spray it directly on the system.
• Do not expose any combustion appliance directly to the air stream of the air-conditioner.
• Do not wash the air-conditioner with water.
• Do not use for preservation of food, plants or animals, precision devices or works of art.
• Do not place anything containing water, like vases, on top of the unit.
• Do not install the air-conditioner where the airflow direction is aimed directly at plants or animals.
• Do not step/sit on the unit nor put anything on it.
• After a long period of use, check the unit's support structure regularly.
• Do not touch the aluminum fins on the heat exchanger.
• Do not shut off the power source immediately after stopping the operation.
• Do not control the system with main power switch.
• Do not pour liquid into the unit and do not put water container on the unit.
• If you operate air-conditioner together with a combustion appliance, you must regularly ventilate the indoor air.
• When you clean air-conditioner, stop the unit and turn off the power source.
• Do not place objects near the outdoor unit or allow leaves to gather around the unit.

Precautions for Relocation or Repairs

• Do not perform any repairs or modifications by yourself. Consult the dealer if the unit requires repair.
• Consult your dealer for repairs.
• In case the air-conditioner is relocated elsewhere, contact your dealer or a qualified installer.
• If you notice anything abnormal (smell of burning, etc.), stop the system, turn off the power source and consult your dealer.
• If the air-conditioner fails to cool or warm the room, it may have a refrigerant leakage. Contact your dealer.

Name of Each Part and Its Function

Indoor Unit

• Air Inlet: Air enters here.
• Air Outlet: Air blows out of here.
• Air Filter: Removes dust or dirt from the inlet air.
• Refrigerant piping connection and electric wire
• Unit display section (Remote control signal receiver)
• Drain hose: Drains water from the indoor unit.

Accessories

• Wireless remote control
• Wireless remote control holder
• Wood screw × 2 (for remote control holder mounting)
• Battery × 2 (R03 (AAA, Micro))

Outdoor Unit

• Air Inlet: (On side & rear surface)
• Air Outlet
• Outdoor unit fan
• Heat exchanger

Remote Control Handling

Replacing the Batteries

Replace old batteries with new ones when the receiving beep is not emitted or the display fades away.

1. Pull out the cover and take out old batteries.
2. Insert new batteries (R03 (AAA, Micro) x2).
3. Close the cover.
4. Press the ACL switch with the tip of a ballpoint pen.

NOTE:

• Do not use old and new batteries together.
• Remove the batteries when the remote control is not used for a long period.
• The recommended effective period of a battery conforming to JIS or IEC should be 6 to 12 months with normal use.
• When the display shows any abnormal condition, press the ACL switch with the tip of a ballpoint pen.

Using the Remote Control Holder

The remote control can be attached to a wall or pillar by using a remote control holder. Before installing the remote control, check that the air-conditioner receives the signals properly.

Warning Note for Remote Control Handling

• Do not go near high temperature places, such as an electric carpet or a stove.
• Do not leave the remote control exposed to direct sunlight or other strong lighting.
• Do not spill any liquid on the remote control.
• Do not drop the remote control. Handle with care.
• Do not put any obstructing obstacles between the remote control and the unit display section.
• Do not place heavy objects on the remote control, or step on it.

Operation Failure with the Remote Control

If the operation fails, operate the unit with temporary operation function. Contact your dealer to have the remote control checked.

Temporary Run Operation

The unit ON/OFF button on the unit display section operates ON/OFF temporarily when the remote control is not used.

• Operation program: OPERATION MODE : AUTO, FAN SPEED : AUTO
• Operation starts by pressing the unit ON/OFF button; it stops if you press the button again.

NOTE: Do not hold the Unit ON/OFF button down for more than 5 seconds.

Installing Two Air-Conditioners in the Same Room

Use this setting when the two air-conditioners are not operated with one remote control. Set the remote control and indoor unit.

Setting the Remote Control

1. Pull out the cover and take out batteries.
2. Disconnect the switching line next to the battery with wire cutters.
3. Insert batteries. Close the cover.

Setting an Indoor Unit

1. Turn off the power source, and turn it on after 1 minute.
2. Point the remote control that was set according to the procedure described on the left side at the unit display section and send a signal by pressing the ACL switch on the remote control.
3. Check that the reception buzzer sound "pip" is emitted from the indoor unit.

Child Lock

This function locks the remote control operation to prevent an operation error.

• Press the SET button for 3 seconds or longer. ? is displayed. While Child Lock is set, only the ON/OFF button can be operated.

Releasing procedure: Turn off the light by pressing the SET button for 3 seconds or longer.

NOTE: While Child Lock is set, the settings of temperature and fan speed cannot be changed. To change the settings, reset Child Lock.

Operation and Display Section for Remote Control

Transmission Section

• ON/OFF (luminous) button: Press to start operation, press again to stop.
• TEMPERATURE button: This button sets the room temperature.
• HI/ECO button: This button changes the HIGH POWER/ECONOMY operation.
• SILENT button: This button selects the SILENT operation.
• ON TIMER button: This button selects ON TIMER operation.
• OFF TIMER button: This button selects OFF TIMER operation.
• WEEKLY button: This button switches the WEEKLY TIMER to ON/OFF.
• CLEAN switch: This switch selects the CLEAN operation.
• SLEEP button: This button selects SLEEP operation.
• FAN SPEED button: Each time the button is pressed, the fan speed changes.
• AIR FLOW (UP/DOWN) button: This button changes the air flow (up/down) direction.
• NIGHT SETBACK button: This button sets NIGHT SETBACK operation.
• SET/Child Lock button: Use this button to set the timer and Child Lock.
• CANCEL button: This button cancels the ON timer, OFF timer, and SLEEP operation.
• TIMER button: This button is used for setting the current time and timer function.
• PROGRAM button: This button sets WEEKLY TIMER.
• ACL switch: Switch for resetting microcomputer.
• TIME SET UP switch: This switch is for setting the time.

Display in OFF status

The current time, day of the week, and present OPERATING MODE are displayed while the air-conditioner is turned off.

Transmission Procedure

When each button on the remote control is pressed with the remote control pointing towards the unit display section, a signal is transmitted. When the air-conditioner receives the signal correctly, it will beep.

Current Time Setting

When inserting the batteries, the current time is automatically set to time setting mode. Mon and 13:00 are displayed as the current time. Set a correct day of the week and a time.

1. Press the TIME SET UP switch.
2. Press the "▲ or ▼ (TIMER)" button.
3. Press the SET button.
4. Press the "▲ or ▼ (TIMER)" button.
5. Press the SET button.

NOTE: The timer operation works based on the time clock, so please set it correctly. The remote control data is reset when the present time is set.

AUTO Mode Operation

Automatically selects the operation mode (COOL, HEAT, DRY) depending on the room temperature when switched on.

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

To stop: Press the ON/OFF button.

NOTE: AUTO mode can be operated by simply pressing the ON/OFF button.

Temperature Adjustment During AUTO

Air temperature adjustment is possible even during automatic operation. There are 6 levels of adjustment possible with the ▲ or ▼ button. During automatic operation, 24°C is preset both for heating and cooling.

1. Press the "▲ or ▼ (TEMP)" button.

When it is a little cold: Press the ▲ button.

When it is a little hot: Press the ▼ button.

FAN SPEED

You can choose the fan speed of your air-conditioner without dry mode.

1. Press the FAN SPEED button.

Operation capacity by your choice:

• Set automatically by microcomputer
• Silent operation
• Energy-saving operation
• Standard operation
• Powerful operation with high capacity

NOTE: When FAN SPEED is changed from Hi to Lo or ULo, the sound of refrigerant flowing may be heard.

Airflow Direction Adjustment

Air flow direction adjustment can not be performed, although a display will be changed if "AIR FLOW” button is pushed.

COOL/HEAT/DRY/FAN Mode Operation

1. Press the MODE button.
2. Press the ON/OFF button.
3. Press the TEMP button.
4. Press the FAN SPEED button.

To stop: Press the ON/OFF button.

NOTE: The operation mode can also be set or changed when the air-conditioner is not in operation.

Air-conditioner Operable Temperature Setting

Use within the following operational range. Operating outside of this range may result in the protection devices being activated, preventing the unit from working.

The long-term use of the unit with a humidity level exceeding 80% may result in condensation forming on the surface of the indoor unit, leading to water drops.

Characteristics of HEAT Mode Operation

Mechanism and Capacity of HEAT Mode Operation

The unit draws heat from the cold outside air, transfers it to indoors and heats the room. As a characteristic of heat pump system, the heating capacity reduces when the outside air temperature gets colder.

• It may take some time to supply hot air after turning on the air-conditioner.
• If the outside temperature becomes extremely low, it would be better to use an additional source of heating.

Defrosting

If the outside temperature becomes low and humidity is high, the heat exchanger in the outdoor unit may frost over, which prevents efficient heating.

• If this happens, the automatic defrost function is activated and during defrosting the heating operation stops for 5 to 15 minutes during defrosting.
• Both indoor and outdoor fans stop and the RUN light blinks slowly (1.5 sec. ON, 0.5 sec. OFF) during defrosting.
• The outdoor unit may give off some steam during defrosting. This is to help the defrosting process and is not a defect.
• The HEAT operation resumes as soon as defrosting has been completed.

SLEEP TIMER Operation

The unit will stop automatically after the set time lapses. The set temperature is automatically adjusted according to the lapse time in order to avoid too much cooling or heating.

1. Press the SLEEP button.

If it is pressed while the unit is off: SLEEP TIMER operation starts with the previous operation settings, and the air-conditioner is turned off after the set time lapses.

If it is pressed while the unit is running: The air-conditioner is turned off after the set time lapses.

Every time the button is pressed, the display changes as follows:

• 1H → 2H → 3H → ... → 9H → No display (canceled)
• Example: You prefer it to stop after 7 hours. Set to 7H.
• The timer light (yellow) is on.
• The unit stops after the set time lapses.

Changing of set time: Set a new time by pressing SLEEP button.

How to cancel: Press the CANCEL button to turn off the SLEEP display.

NOTE: Cannot be set at the same time with OFF-TIMER.

OFF-TIMER Operation

The unit stops automatically when the set time comes. With the air-conditioner turned off, start the operation from Step 1. With the air-conditioner running, start from Step 2.

1. Press the ON/OFF button.
2. Press the OFF-TIMER button.
3. Press the "▲ or ▼ (TIMER)" button.
4. Press the SET button.

Changing of set time: Set a new time by using the OFF-TIMER button.

How to cancel: Press the CANCEL button to turn off the timer display.

NOTE: The unit stops at the end of the set period of time. Different from SLEEP TIMER operation, automatic set temperature adjustment is not done during OFF-TIMER operation.

ON-TIMER Operation

Operation starts 5 to 60 minutes before the set time so that the room temperature reaches the optimum temperature at the set time. ON-TIMER operation can be set regardless of whether the air-conditioner is running or not.

1. Press the ON-TIMER button.
2. Press the "▲ or ▼ (TIMER)" button.
3. Press the SET button.

NOTE: Operation starts 5 to 60 minutes before the set time. The timer light (yellow) goes out at the set time. Make sure to press the button within 60 seconds from the last operation in step 2, otherwise the setting is not completed. The current time is not displayed during ON-TIMER operation. If the ON/OFF button is pressed after setting the ON-TIMER, the setting will be canceled.

SLEEP TIMER + ON-TIMER Operation

Combined timer operation of SLEEP TIMER and ON-TIMER.

Example: When it is required to stop after 3 hours and then start operation at 8:00, near the set temperature.

1. SLEEP TIMER setting: Set by the procedures on page 15.
2. ON-TIMER operation setting: Set by the above procedure mentioned in ON-TIMER.

NOTE: After the SLEEP TIMER set time has elapsed, the operation stops, and it starts from 5 to 60 minutes before the ON-TIMER's set time. The timer light is turned off when ON-TIMER set time comes.

ON-TIMER + OFF-TIMER Operation

The timer operations of the combination of ON and OFF-TIMER.

Example: Present time is 21:00. The air-conditioner running. When it is preferred to stop at 22:30, and then start operation at 8:00, near the set temperature.

1. OFF-TIMER operation setting: Set by the procedures on page 15.
2. ON-TIMER operation setting: Set by the procedures on page 16.

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

Comfort Start-up

In ON-TIMER operation, the unit starts the operation a little earlier, so that the room can approach optimum temperature at ON time. This is so called "Comfort start-up".

• The room temperature is checked 60 minutes before the ON time. Depending on the temperature at that time, the operation starts 5 to 60 minutes before the timer is at ON.
• The function is available for both COOL and HEAT operation mode (including AUTO). It does not work for DRY mode.

SLEEP TIMER

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

• During cooling: The preset temperature is lowered by 1°C at the start of SLEEP operation (when the timer is set). After that, the temperature goes up by 1°C every an hour to become 1°C higher than the present temperature.
• During heating: The preset temperature is lowered by 1°C at the start of SLEEP operation (when the timer is set). After that the temperature becomes 3°C lower in an hour and 6°C lower in two hours than the present temperature.

WEEKLY TIMER Operation

Up to 4 programs with timer operation (ON-TIMER / OFF-TIMER) are available for each day of the week. Max 28 programs per week are available. Once this has been set, the timer operation will be repeated at the same programs every week unless the WEEKLY TIMER is canceled.

Sample (At cooling season)

WEEKLY TIMER ON/OFF Setting

Switch the WEEKLY TIMER to ON/OFF by using the WEEKLY button.

NOTE: The WEEKLY TIMER is switched to ON/OFF regardless of whether the air-conditioner is running or not.

Setting Mode <Individual Setting>

Set after setting the current day of the week and the time.

1. Press the PROGRAM button.
2. Press the "▲ or ▼ (TIMER)" button.
3. Press the SET button.
4. Press the "▲ or ▼ (TIMER)" button.
5. Press the SET button.
6. Press the ON-TIMER or OFF-TIMER button.
7. Press the "▲ or ▼ (TIMER)" button.
8. Set required operation contents.
9. Press the SET button.
10. Press the PROGRAM button or SET button.

Setting Mode <Collective Setting>

Set the same operation contents to the same program number of all the days of the week. In Step 2 above, select "all of the days of the week". When the contents that were individually set exist in the same program number, the contents are overwritten.

NOTE: If no operation is performed for 60 seconds in setting mode, the setting changes that have been made until then become invalid and the setting mode terminates.

Confirm Mode

The WEEKLY TIMER setting contents can be confirmed.

1. Press the PROGRAM button for 3 seconds or more.
2. Press the "▲ or ▼ (TIMER)" button.

Releasing procedure: The Confirm mode can be terminated by pressing the ON/OFF, CANCEL or SET button.

NOTE: If no operation is performed for 60 seconds in Confirm mode, the Confirm mode is terminated.

HIGH POWER/ECONOMY Operation

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

HIGH POWER Operation

Pressing the HI/ECO button intensifies the operating power and initiates powerful cooling or heating operation for 15 minutes continuously. The remote control displays and the FAN SPEED display disappears.

NOTE:

• During the HIGH POWER operation, the room temperature is not controlled.
• HIGH POWER operation is not available during the DRY and ON-TIMER + OFF-TIMER operations.
• When HIGH POWER operation is set after setting ON-TIMER operation, HIGH POWER operation will start from the set time.
• After HIGH POWER operation, the sound of refrigerant flowing may be heard.

ECONOMY Operation

Pressing the HI/ECO button initiates a soft operation with the power suppressed in order to avoid an excessive cooling or heating. The unit operates 1.5°C higher than the setting temperature during cooling or 2.5°C lower than that during heating. The remote control eco displays and the FAN SPEED display disappears.

NOTE: It will go into ECONOMY operation at the next time the air-conditioner runs in the following cases.

NIGHT SETBACK Operation

During the cold season, the room temperature can be maintained at a comfortable level during the absence, at night, and while the room is unattended. The air-conditioner maintains the constant temperature at about 10°C.

1. Press the NIGHT SETBACK button.

Releasing procedure: Press the NIGHT SETBACK button or MODE button to turn off the NIGHT SETBACK display.

NOTE: During NIGHT SETBACK operation, the air-conditioner maintains the set temperature at about 10°C. During NIGHT SETBACK operation, temperature settings cannot be made. Since the room temperature may change quite a bit, it is recommended that this be used when no one is in the room. During NIGHT SETBACK operation, HIGH POWER and ECONOMY operations cannot be set. When NIGHT SETBACK operation is canceled by pressing the NIGHT SETBACK button, the operation mode is reset to the mode immediately prior to the NIGHT SETBACK operation.

SILENT Operation

When the SILENT operation is set, the unit operates more silently reducing noise from the outdoor unit. With the air-conditioner turned off, start the operation from Step 1. With the air-conditioner running, start from Step 2.

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

Releasing procedure: Press the SILENT button to turn off the SILENT display.

NOTE: During SILENT operation, the maximum cooling and heating capacities deteriorate. SILENT operation will not function during DRY and FAN operation. In case of following operations, the air-conditioner will resume SILENT operation whenever it turns ON again. When the air-conditioner is stopped by ON/OFF button during SILENT operation. When the air-conditioner is stopped in SLEEP or OFF-TIMER operation during SILENT operation. When the operation is retrieved from CLEAN operation. Not operable while the air-conditioner is OFF. The noise level of the outdoor unit may not decrease depending on the condition. In case of SCM multi system, SILENT control function is invalid.

SELF CLEAN Operation

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

1. In order to active CLEAN operation, press the CLEAN switch with the tip of a ballpoint pen.

NOTE: Two hours later, the air-conditioner stops CLEAN operation automatically. To stop the air-conditioner immediately, press the ON/OFF button. CLEAN operation is not operated after HEAT, FAN, OFF-TIMER and SLEEP operations have finished. The indoor unit fan runs for about two hours in CLEAN operation. The RUN light illuminates during CLEAN operation. Pressing the SLEEP button or NIGHT SETBACK button during CLEAN operation cancels the CLEAN operation and then the unit is set to SLEEP or NIGHT SETBACK operation. This is not a function for removing mold, germs or grime that have already adhered to the unit.

Auto Restart Function

What is auto restart function? Auto restart function records the operational status of the air-conditioner immediately prior to be switched off by a power cut, and then automatically resumes operations after the power has been restored. The following settings will be canceled: Timer settings, HIGH POWER operations.

NOTE: Auto restart function is set at on when the air-conditioner is shipped from the factory. Consult with your dealer if this function needs to be switched off. When power failure occurs, the timer setting is canceled. Once power is resumed, set the timer again.

Tips for Effective Operation

Please observe the following for the most economic and comfortable use of your unit.

• Set a suitable room temperature: Excessively high or low temperatures are not good for your health and waste of electricity.
• Adjust the airflow direction properly: Adjust the up/down and left/right airflow to ensure a steady room temperature. Air flow direction adjustment can not be performed by unit.
• Clean the filters frequently: Clogged filters may block the airflow and cause less efficient operation. Please request cleaning of the air filter from special contractor.
• Operate the unit only when needed: Use the timer properly to operate the unit only when needed.
• Avoid direct sunlight and draught: Cut out direct sunlight by drawing the curtains or blinds when cooling. Keep windows and doors shut, except when ventilating.
• Keep heat source away when cooling: Keep heat sources out of the room as much as possible.

Maintenance

Before Maintenance

• Turn off the power source.
• Do not spill any liquid.
• Do not touch the aluminum fins on the heat exchanger.
• Do not use the following articles: Hot water (40°C or more), Petrol, paint thinner, benzine or cleanser, etc.

During the Operational Season

Cleaning the Air Filter

Please request cleaning of the air filter from special contractor.

NOTE: The air filter that comes with the unit cannot be washed with water. Cooling/heating is affected by an air filter clogged up with dust etc., and the operation noise becomes louder. It may also use extra electricity. Please clean the air filter at appropriate intervals.

At the End of the Season

1. Perform the fan operation for 2 to 3 hours. Dry the inside of the unit.
2. Stop the unit and turn off the power source.
3. Clean and reinstall the air filters.
4. Remove batteries from the remote control.

At the Beginning of the Season

1. Ensure that the earth wiring is not snapped nor disconnected.
2. Check if there is no corrosion or rust on the base frame of the outdoor unit.
3. Make sure that there are no obstacles blocking the airflow around the air intake and outlet openings of the indoor and outdoor units.
4. Turn on the power source.
5. Insert batteries in the remote control.

Proper Installation

Suitable Installation Position

• Do not put any obstruction in front of the indoor unit, preventing proper ventilation and functioning.
• Do not install the unit in any of the following places: Where there is a danger of leaking flammable gases. Where there is substantial splashing of oil. Malfunctioning due to corrosion may occur if the unit is installed in a spa where sulfide gases are generated, or in a seaside resort exposed to sea breezes. Contact your dealer.
• The air-conditioner and remote control must be at least 1 meter away from a TV set or radio.
• Drain the dehumidified liquid from the indoor unit into a spot that drains well.

Pay Attention to Operating Noises!

When you install the unit, take care to choose a place that can comfortably stand the weight of the unit and does not increase the operating noise or vibration. If vibration is transmitted through the house, fix the unit with the aid of vibration-proof pads between the unit and the fittings.

• Select a place where cold or hot air, operation noises from the indoor and outdoor units do not cause any inconvenience to your neighbours.
• Do not leave any obstacles near the outlet and inlet of the outdoor unit. This may cause malfunctioning and increased operating noise.
• If you hear an irregular noise during operation, contact your dealer.

Inspection and Maintenance

Depending on operating environment, the inside of the air-conditioner may become dirty after a few year operations. This will reduce performance. In addition to normal cleaning, we would recommend inspection and maintenance. (This may lead the air-conditioner to having a longer life without any trouble.) Contact your dealer, or any distributor, for inspection and maintenance. (There will be a charge for this service). We would recommend inspection and maintenance to be carried out during the off-season. If the supply cord of this appliance is damaged, it must only be replaced by a repair shop appointed by the manufacturer, because special purpose tools are required.

Troubleshooting

Please carry out the following checks before making a service call.

The air-conditioner does not work at all.

• Has the power switch been turned off?
• Has the timer been set in the "ON" position?
• Is there a power failure or a blown fuse?
• Have you set the thermostat at a suitable temperature?

Poor cooling or heating

• Is the air filter clean? (Not clogged?)
• Did you leave any doors or windows open?

Poor cooling

• Is there a heat source in the room?
• Are there too many people in the room?

If the air-conditioner does not operate properly after you have checked the left points, or if any doubt still exists after you have consulted page 27, or if things happen as shown on page 28, switch off the power and contact your dealer.

Notice

Air flow

• Airflow is not blown out when starting the HEATING operation. (RUN light blinks slowly)
• Airflow is not blown out for 5 to 15 min. or blown out not warm wind for a moment at HEATING operation. (RUN light blinks slowly)
• Airflow is not blown out when starting the DRY operation.

Noise

• You hear a slight gurgling sound.
• You hear a slight cracking sound.
• You hear a hissing or clicking sound.
• Whistling noise is heard from the outdoor unit.
• Sometimes a "Shooooo" sound might come for a short time from the unit that is turned off.

Others

• The unit does not restart immediately after you have stopped it. (RUN light is on)
• Some steam escapes during COOL operation.
• There is a slight smell.
• After a power cut, the unit does not restart even if power has been restored.
• Remote control signals are not received.
• Moisture may form on the air outlet grills.
• Fan will not stop immediately after unit operation was stopped.
• RUN light stays on even though operation was stopped.

Contact Your Dealer

Turn off the power switch immediately and inform your dealer in any of the following situations:

• The fuse or switch blows continuously.
• The cable becomes extremely hot.
• The covering of the cable is cracked.
• The TV, radio or other equipment starts to malfunction.
• A switch does not activate properly.
• You hear a strange noise during operation.
• When the foreign matters enter the indoor unit through the air outlets and the dumper becomes inoperable, call your dealer.
• When abnormalities occur, turn off the power source immediately and turn it on after 3 minutes. Restart the operation with ON/OFF button of the remote control and the abnormalities still continue.

About the Multiple Air-Conditioner

Simultaneous Operation

The air-conditioners cannot be in different operating modes at the same time, such as one unit being in the "Cool" mode and one unit being in the "Heat" mode.

• When conducting different operations, the air-conditioner that was operated first will be given priority, so the air-conditioner that is operated after that will conduct air blowing operation.
• When you want to give priority to the air-conditioner that was started later, either stop the air-conditioner that has priority or cause the operation type of the unit operated first to match that of the unit operated second.
• When other indoor units are operating in different modes, the RUN light illuminates.

Automatic Operation

When the remote control operation switch is in the "AUTO" mode the air-conditioner automatically selects either "COOL,” “DRY,” or "HEAT" when operation is started depending on the room temperature.

• During simultaneous operation of air-conditioner units, operation modes may be automatically changed in response to the temperatures of the individual rooms; this will result in the operation of the outdoor unit being stopped. In such a case, COOL or HEAT mode should be used instead of AUTO. (This is only relevant when more than one air-conditioner unit is being used.)

Refrigerant (oil) Recovery Operation

If the all of the indoor units are not operated at the same time for an extended period, the cooling or heating performance may temporarily decrease. This is in order to control the recovery of the refrigerant (oil) in the stopped indoor unit(s). At this time, the sound of refrigerant flowing may be heard from the stopped indoor unit(s).

Self Diagnosis Function

We are constantly trying to do better service to our customers by installing such judges that show abnormality of each function as follows: