Thank you for purchasing a MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. Air-Conditioner. To get the best long-lasting performance, please read and follow this user’s manual carefully before using your air-conditioner. After reading, please store the manual in a safe place and refer to it for operational questions or in the event of any irregularities.
Safety precautions • Before starting to use the system, please read these “Safety precautions” carefully to ensure proper operation of the system. • When you have read this user’s manual, please keep it safely. If someone else takes over as user, make sure that the manual is also passed on to the new user.
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❚ INSTALLATION PRECAUTIONS WARNING • The system is for domestic and residential use. If used in severe environments, such as an engineering workplace, the equipment may function poorly. • The system must be installed by your dealer or a qualified installer. It is not advisable to install the system by yourself, as faulty handling may cause leakage of water, electric shock or fire.
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❚ Safety precautions ❚ OPERATION PRECAUTIONS WARNING • Children shall not play with the • Cleaning and user maintenance shall air-conditioner. not be made by children without • Do not expose yourself to the cooling supervision. • Do not insert anything into the air air for a long period.
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❚ Safety precautions CAUTION • Do not touch the aluminum fins on the • Do not shut off the power source heat exchanger. immediately after stopping the operation. It may result in injury. • Do not place household electrical Wait at least 5 minutes, otherwise there is appliances or household items under- a risk of water leakage or breakdown.
❚ Safety precautions ❚ PRECAUTIONS FOR RELOCATION OR REPAIRS WARNING • Do not perform any repairs or modifications by yourself. Consult the dealer if the unit requires repair. If you repair or modify the unit, it can cause water leaks, electric shocks or fire. •...
Name of each part and its function INDOOR UNIT Air-cleaning filter Room temperature • Natural enzyme filter Air inlet panel Air inlet sensor (Green) Page 27 Air filters Page 27 Filter holder • Inside of • Photocatalytic washable the unit deodorizing filter (Orange) WARNING DO NOT INSERT ANYTHING...
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Name of each part and its function Unit display section RUN light (green) • Illuminates during operation. Remote control signal receiver • Blinks slowly when SELF CLEAN operation (3 seconds ON, 1 second OFF). Page 26 Unit ON/OFF button This button can be used for turning on/off the unit when a remote control is not available.
Remote control Setting the batteries NOTE Pull out the cover. • 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 Insert new batteries.
Installing two air-conditioners in the same room ■ When two air-conditioners are installed 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 Setting an indoor unit Pull out the cover and take out Turn off the power source and turn it on after 1 minute.
Airflow range setting ■ Take the air-conditioner location into account and adjust the left/right airflow range to maximize air-conditioning. If the air-conditioner is running, press the ON/OFF button to stop. The airflow range setting cannot be made while the unit is running. Press the AIR FLOW U/D (UP/DOWN) button and the AIR FLOW L/R (LEFT/RIGHT) button together for 5 seconds or more.
Operation and display section for remote control Transmission section OPERATION MODE select button Each time the button is pressed, the mode changes. ON/OFF (luminous) button Page 13 Press to start operation, press again to stop. TEMPERATURE button This button sets the room temperature. FAN SPEED button Each time the button is pressed, the fan speed changes.
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 time. Example: Set to Sat 10:30. Press the TIME SET UP switch.
Air-conditioner operation temperature range ■ Use within the following operational range. Operating outside of this range may result in the protection devices being activated, preventing the unit from working. COOL mode operation Outside temperature Approximately -15 to 46 °C Inside temperature Approximately 18 to 32 °C Below approximately 80% Inside humidity...
Airflow direction adjustment ■ Up/down direction can be adjusted with the AIR FLOW U/D (UP/DOWN) button on the remote control. Every time you press this button, the mode changes as follows: Change on AIR FLOW (UP/DOWN) mode. (Flap stopped) (Swing) ■...
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. Page 18 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.
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. Page 18 ON TIMER operation can be set regardless of whether the air-conditioner is running or not. Example: When the preferred room temperature is required at 8:00.
ON TIMER + OFF TIMER operation ■ This is the combined timer operation of ON TIMER 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.
WEEKLY TIMER operation ■ Up to 4 programs with timer operation (ON TIMER / OFF TIMER) are available for each day of the week. Maximum 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.
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Setting mode <Individual setting> Set after setting the current day of the week and the time. Press the PROGRAM button. and current day of the week blink. Press the “ or (TIMER)” button. Select a day of the week to be reserved. Every time the button is pressed, the display is switched in the order of:...
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Press the “ or (TIMER)” button. Set a time. Every time the button is pressed, the display is switched in the order of: 0:00 0:10 0:20 1:00 1:10 (Units of ten minutes) Every time the button is pressed, the display is switched in the order of: 0:00 23:50 23:40 23:00 22:50...
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How to cancel the setting <Individual setting> Press the PROGRAM button. and current day of the week blink. Press the “ or (TIMER)” button. Select a day of the week to be canceled. Press the SET button. The day of the week is determined and the program number blinks. Press the “...
HIGH POWER/ECO operation Press the ON/OFF button. Press the HI/ECO button. • When the operating mode is COOL Every time the HI/ECO button is pressed, the display is switched in the order of: No display (HIGH POWER) (ECO) (Normal 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. Press the ON/OFF button. Press the SILENT button.
MENU function ■ MENU function is used for setting the display brightness adjustment, SELF CLEAN operation and PRESET operation. Every time the MENU switch is pressed with the tip of a ballpoint pen, etc., the display is switched in order of: Display brightness SELF CLEAN PRESET operation...
SELF CLEAN operation ■ SELF CLEAN operation should be run after COOL and DRY operation to remove the moisture from inside of the indoor unit and control the growth of mold and bacteria. Select the SELF CLEAN operation by pressing the MENU switch.
Maintenance Before maintenance During the operational season Cleaning the air filter Standard interval is once Turn off the power source. every two week Remove the air filter • Pull up the air inlet panel forward. • Lightly hold the knobs both sides and lift a little to remove the panel forward.
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Cooling is affected by an air filter clogged up with dust etc., and the operation noise becomes louder. It may also NOTE use extra electricity. Please clean the air filter at appropriate intervals. At the end of the season At the beginning of the season Perform the fan operation for 2 to 3 hours.
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. −...
Notice Airflow Air is not blown out when starting the DRY operation. The indoor fan may stop to prevent re-evaporation of dehumidified moisture and to save energy. (RUN light is on) Noise You hear a slight gurgling sound. This is caused by refrigerant moving within the unit. You hear a slight cracking sound.
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. •...
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 RUN light Description of trouble Cause Indoor heat exchanger sensor 1 • Broken heat exchanger sensor 1 wire, poor connector 1-time flash error connection...
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