MITSUBISHI HEAVY SRK20ZT-WA Air Conditioner

Specifications:

• Model: SRK20ZT-WA, SRK25ZT-WA
• Manufacturer: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
• Product Type: Air-Conditioner
• Reference: RLF012A115 202309

Product Information

Thank you for choosing the MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. Air-Conditioner. This product is designed to provide efficient cooling and comfort in your space. Please read the user’s manual carefully for proper usage and maintenance instructions.

Usage Instructions:

Safety Precautions:

Before using the air-conditioner, ensure to read and understand the safety precautions outlined in the manual. It is crucial for the proper and safe operation of the system. Keep the manual in a safe place for future reference.

Waste Electrical Disposal:

Ensure that the air-conditioner is disposed of properly at an authorized treatment facility for re-use, recycling, and recovery. Do not dispose of it in the municipal waste stream. Contact the installer or local authority for disposal information.

Warnings and Cautions:

Pay close attention to warning and caution signs in the manual to prevent hazardous situations that could lead to injury or damage. Follow all instructions carefully for your safety.

Operating Instructions:

Refer to the manual for detailed instructions on using features such as Sleep Timer, On Timer, Off Timer, Allergen Clear, Weekly Timer, High Power/Economy, Night Setback, Silent operation, and Menu functions.

Frequently Asked Questions

• Q: How should I dispose of the air-conditioner?
  • A: The air-conditioner should be taken to an authorized treatment facility for disposal to ensure proper recycling and recovery. Contact the installer or local authority for guidance on disposal methods.
• Q: What do warning symbols in the manual indicate?
  • A: Warning symbols highlight potentially hazardous situations that could result in severe consequences if not avoided. It is essential to follow these warnings for your safety.

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PRLF012A115 202309

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.

Your air-conditioner is marked with this symbol. It means that waste electrical and electronic equipment (WEEE as in directive 2012/19/EU) should not be mixed with general household waste. Air-conditioner should be treated at an authorized treatment facility for re-use, recycling and recovery and not be disposed of in the municipal waste stream. Please contact the installer or local authority for more information.

ENGLISH

This symbol printed on the batteries attached to your air-conditioner is information for end-users according to the EU directive 2006/66/EC article 20 annex II. Batteries, at their end-of-life, should be disposed of separately from general household waste. If a chemical symbol is printed beneath the symbol shown above, this chemical symbol means that the batteries contain a heavy metal at a certain concentration. This will be indicated as follows: Hg:mercury(0.0005 %), Cd:cadmium(0.002 %), Pb:lead(0.004 %) Please, dispose of batteries correctly at your local community waste collection or the recycling center. The emission sound pressure level from each Indoor and Outdoor unit is under 70 dB(A).

Safety precautions

x Before starting to use the system, please read these “Safety precautions” carefully to ensure proper operation of the system.
x 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.

WARNING

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

CAUTION

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

Please observe these precautions with great care, since they are essential to your safety. x Symbols which appear frequently in the text have the following meaning:

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.

A service personnel should be handing this equipment with reference to the installation manual.

This equipment uses Àammable refrigerants. If the refrigerant is leaked, together with an external ignition source, there is a possibility of ignition.

WARNING

x Strict compliance of the domestic laws must x The appliance shall be stored in a well-

be observed when disposing the appliance. ventilated area where the room size

x Do not use means to accelerate the

corresponds to the room area as speci¿ed for

defrosting process or to clean, other than

operation.

those recommended by the manufacturer. x The sta in servicing operations must hold

x The appliance shall be stored in a room

the national quali¿cation or other relevant

without continuously operating ignition

quali¿cations.

sources (for example: open Àames, an

x The indoor unit shall be stored in a room that

operating gas appliance or an operating

has a minimum area of 4.0 m2.*

electric heater). x Do not pierce or burn.

*This value is for split system. In the case of multi system, see the installation sheet of

x Be aware that refrigerants may not contain an outdoor unit.

odour.

EN-2

Safety precautions

INSTALLATION PRECAUTIONS
WARNING
x The system is for domestic and residential use. If used in severe environments, such as an engineering workplace, the equipment may function poorly.
x 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.

CAUTION
x Do not install it where flammable gas may leak. Gas leaks may cause fire.

x Make sure that an earth leakage
breaker is installed. If you do not install an earth leakage breaker, you may get an electric shock.

x Make sure to install the drain hose properly so that all the water is drained out.
Improper installation may lead to water drop in the room resulting in wet furniture.

x Make sure that the system has been properly earthed.
Earth wire should never be connected to a gas pipe, water pipe, lightning conductor or telephone earth wire. Improper installation of the earth wire may cause an electric shock.

This Product contains fluorinated greenhouse gases. Do not vent R32 into the atmosphere: R32 is a fluorinated greenhouse gas with a Global Warming
Potential (GWP) = 675. Refer to a label on outdoor unit for the weight of fluorinated greenhouse gas and CO2 equivalent.

EN-3

Safety precautions

OPERATION PRECAUTIONS

WARNING

x Children shall not play with the air-conditioner.
x Do not expose yourself to the cooling air for a long period.
This could affect your physical condition and cause health problems.

x Cleaning and user maintenance shall not be made by children without supervision.
x Do not insert anything into the air outlet.
This may cause injury, as the internal fan rotates at high speed.

x 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.
x Store the remote control out of reach of children.
Failure to observe this may result in the batteries being swallowed or other accidents.

CAUTION

x Only use approved fuses.

x Do not use for preservation of food,

Use of steel or copper wire instead of an plants or animals, precision devices or

approved fuse is strictly prohibited, as it works of art.

may cause a breakdown or fire.

The system is only intended for use in

x Do not handle the switches with wet ordinary domestic rooms. Any other use

hands.

of the system may damage the quality of

This may cause an electric shock.

food, etc.

x Do not swing from the indoor unit. x Do not place anything containing

If the indoor unit falls down, you may get water, like vases, on top of the unit.

injured.

Water entering the unit could damage the

x Do not place a flammable insecticide insulation and therefore cause an electric

or paint spray near the air-conditioner, shock.

nor spray it directly on the system. x Do not install the air-conditioner where

This may result in a fire. x Do not expose any combustion

the airflow direction is aimed directly at plants or animals.

appliance directly to the air stream of This will damage their health.

the air-conditioner.

x Do not step/sit on the unit nor put

The combustion appliance may

anything on it.

malfunction.

If the unit falls down or things drop from it,

x Do not wash the air-conditioner with people could get hurt.

water.

x After a long period of use, check the

This could cause an electric shock.

unit’s support structure regularly.

Using a high pressure washer may cause If you do not repair any damage right

damage to the aluminum fins, resulting in away, the unit may fall down and cause

performance decrement.

personal injury.

EN-4

Safety precautions

CAUTION

x Do not touch the aluminum fins on the x Do not shut off the power source

heat exchanger.

immediately after stopping the

It may result in injury.

operation.

x Do not place household electrical

Wait at least 5 minutes, otherwise there is

appliances or household items

a risk of water leakage or breakdown.

underneath the indoor or outdoor x Do not control the system with main

units.

power switch.

Condensation falling from the unit may It can cause fire or water leakage. In

stain objects and cause accidents or

addition, the fan can start unexpectedly,

electrical shock.

which can cause personal injury.

x Do not operate the system without the x Do not pour liquid into the unit and do

air filter.

not put water container on the unit.

It can cause malfunction of the system Water entering the unit could damage the

due to clogging of the heat exchanger. insulation and therefore cause an electric

shock.

x If you operate air-conditioner together x Contact your dealer to clean inside the

with a combustion appliance, you must indoor unit, do not attempt to do by

regularly ventilate the indoor air.

yourself.

Insufficient ventilation may cause

The use of a non-approved detergent or

accidents due to oxygen deficiency.

improper washing method may damage

x Stand firmly on a stepladder or other the unit’s plastic components and cause

stable object when removing the inlet leaks. Damage, smoke, or fire may also

panel and filters.

happen if the detergent comes in contact

Failure to observe this may result in injury with electrical parts or the unit’s motor. through insecure objects toppling over. x Stop the unit and turn off the power if
x When you clean air-conditioner, stop you hear thunder or there is a danger the unit and turn off the power source. of lightning.

Never open the panel while the internal It may damage the unit.

fan is rotating.

x If the power cable becomes damaged,

x Do not place objects near the outdoor contact your dealer or a qualified

unit or allow leaves to gather around installer.

the unit.

If it is not replaced, it may cause a

If there are objects or leaves around the breakdown or fire.

outdoor unit, small animals may enter

unit and contact electrical parts and may

cause a break-down, smoke or fire.

EN-5

Safety precautions
WIRELESS LAN PRECAUTIONS
WARNING
x Do not turn ON the wireless LAN communication near automatic control equipment such as an automatic door or fire-alarm device. It may cause an accident due to malfunction of equipment.
x Do not turn ON the wireless LAN communication in a hospital, etc. where the use of wireless devices is prohibited. It may cause malfunction of medical equipment due to a wireless device.
x Do not turn ON the wireless LAN communication near a person with a cardiac pacemaker or implanted defibrillator. It may cause malfunction of a medical device.
CAUTION
x Do not turn ON the wireless LAN communication near another wireless device, microwave, cordless phone, fax machine, etc. It may cause malfunction of wireless device.
x When operating the air-conditioner from outdoors, fully confirm the statuses of the unit, its periphery, and persons in the room beforehand. It may cause damage to your health, contamination of household goods, or negative effects on animals.
x When someone is in the room, notify him/her that the air-conditioner is to be operated from outdoor. It may cause damage to your health.
x Check the operational status periodically. Sudden indoor/outdoor temperature changes may cause damage to your health.
EN-6

Safety precautions

PRECAUTIONS FOR RELOCATION OR REPAIRS

WARNING
x 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.

x Consult your dealer for repairs.

x If the air-conditioner fails to cool

Wrong repairs could cause an electric or warm the room, it may have a

shock, fire, etc.

refrigerant leakage. Contact your

x In case the air-conditioner is relocated dealer.

elsewhere, contact your dealer or a If refrigerant needs to be added,

qualified installer.

check with your dealer for proper

Faulty installation may cause water

instructions.

leakage, electric shock, fire, etc.

If the refrigerant comes in contact with the

x If you notice anything abnormal (smell bare skin, it may cause cold injury.

of burning, etc.), stop the system, turn If the refrigerant gas is inhaled

off the power source and consult your excessively, it may cause deterioration

dealer.

of nerve function like dizziness and

Continued use of the system in abnormal circumstances can result in malfunctioning, electric shock, fire, etc.

headache, or deterioration of heart function like irregular heartbeat and heart palpitation temporarily. If refrigerant

unexpectedly leaks from the unit onto

a fan heater, stove, hotplate or other

heat source, harmful gases could be

generated.

Tips for effective operation

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

x Set a suitable room temperature. Excessively high or low temperatures are not good for your health and waste of electricity.

x Clean the filters frequently. Clogged filters may block the airflow and cause less efficient operation.

Page 32

x 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.

x Adjust the airflow direction properly. Adjust the up/down and left/right airflow to ensure a steady room temperature.

x Operate the unit only when needed. Use the timer properly to operate the unit only when needed.

x Keep heat source away when cooling. Keep heat sources out of the room as much as possible.

EN-7

Name of each part and its function

INDOOR UNIT

Air inlet panel Page 32
Air filters Page 32
Fan x Inside of
the unit
WARNING
DO NOT INSERT ANYTHING INTO THE AIR OUTLET
Heat exchanger (Aluminum fin)
Louvers (Vertical blades) x Left / right airflow
direction adjustment
Flaps (Horizontal blades) x Up / down airflow
direction adjustment

Air inlet

Room temperature sensor
Model name

Air-cleaning filter
x Allergen clear filter (Light orange)

Filter holder
x Photocatalytic washable deodorizing filter (Orange)

Air outlet
QR code · You can check
the SSID and KEY (Password).

· This equipment uses flammable refrigerant.
Page 2

Unit display section
Page 9

Filter holder
%POPUXBTIUIFJOTJEFPGUIFBJS DPOEJUJPOFS8BUFSMFBLBHFBOE QFSNBOFOUEBNBHFNBZSFTVMU &MFDUSJDBMIB[BSEFYJTUT $BVUJPO
IJHIWPMUBHF
TIVUPQPXFS CFGPSFTFSWJDJOHGBOBOEGBONPUPS %POPUUPVDIUIFUFSNJOBMCMPDL

ZUIFGPMMPXJOHPQFSBUJPO

GPSDFEDPPMJOHPQFSBUJPO JTQPTTJCMF*TPMBUFUIFQPXFSTVQQMZ 3FDPOOFDUQPXFSTVQQMZ)PMEUIF0/0”TXJUDI EPXOGPSTFDPOETVOUJMZPVIFBSBCFFQ

OUTDOOR UNIT
Air inlet (back and side)

WARNING CAUTION

MOVING FAN BLADES
DO NOT INSERT ANYTHING INTO THE AIR OUTLET. IT MIGHT CAUSE INJURY.

SHARP EDGE OF FINS
DO NOT TOUCH THE ALUMINUM FINS. IT MIGHT CAUSE INJURY.

DO NOT STEP ON TOP OF THIS UNIT. IT MIGHT CAUSE INJURY.

Fan x Inside of the unit
Heat exchanger (Aluminum fin)

Drain hole

Air outlet

EN-8

Model name and refrigerant type

Refrigerant pipe and electric wire
Drain hose

Don’t touch the terminal block.
Don’t touch refrigerant pipings and connections.

· This equipment uses flammable refrigerant.
Page 2

Name of each part and its function

Unit display section

RUN light (green)

x Illuminates during operation.

x Flashes slowly when SELF CLEAN

operation (3 seconds ON, 1 second

OFF).

Page 28

x Flashes when airflow is stopped to prevent blowing out of cold air in heating operation. (1.5 seconds ON, 0.5 seconds OFF)
Page 34

Accessories

Remote control signal receiver
Unit ON/OFF button This button can be used for turning on/off the unit when a remote control is not available.
Page 10 TIMER light (yellow) Illuminates during TIMER operation.
x RUN light flashes quickly during invalid operation mode. Page 36

Battery × 2 (R03 (AAA, Micro))

Allergen clear filter (Light orange)

Remote control

Remote control holder

Wood screw × 2 (for remote control holder mounting)

Photocatalytic washable deodorizing filter (Orange)

Filter holder × 2

NOTICE

x Buzzer sound for remote control
Buzzer sound (PipPip) is emitted when preset temperature is set to 24 °C or, AUTO operation mode is selected or, automatic airflow is selected (except FAN mode operation).

Buzzer sound (Pip) is emitted when air-conditioner is turned off by pressing ON/OFF button (except SELF CLEAN operation).

Buzzer sound (Peep Pip) is emitted when Wireless LAN connection setting, Wireless LAN communication setting.

Airflow setting

Preset temperature

Pip

Pip

Pip Pip

Pip

Pip

Pip

Pip

Pip Pip

Pip

Pip

EN-9

Remote control

Setting the batteries

1 Remove the cover.
2 Insert new batteries. R03 (AAA, Micro) x 2 Pay attention to the and marks

NOTICE
x Do not mix old and new batteries or batteries of different type (manganese / alkaline).
x Remove the batteries when the remote control is not used for a long period. x The recommended effective period of a battery conforming to JIS or IEC
should be 6 to 12 months with normal use. If used longer, or when an unspecified battery is used, liquid may leak from the battery, causing the remote control to malfunction. x The recommendable effective period is printed on the battery. This may be shorter due to manufacturing time to the unit. However, the battery may still be in working order after expiry of its nominal life.

When the display shows any abnormal condition, press the ACL switch with the tip of a ballpoint pen.

Using the remote control holder

3 Close the cover. 4 Press the ACL switch with
the tip of a ballpoint pen.

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

Set the current time.
Page 14 Current time setting Step 2

For installing or removing the remote control, move it up or down in the holder.

The following cases show exhausted batteries. Replace old batteries with new ones. x Receiving beep is not emitted when a signal is transmitted. x Display fades away.

Warning note for remote control

x Do not take remote control near high temperature places, such as an electric heating carpet or a stove.

Strictly prohibited
x Do not leave the remote control exposed to direct sunlight or other strong lighting.

x Do not drop the remote control. Handle with care.

x Do not put any obstructing obstacles between the remote control and the unit.

x Do not spill any liquid on the remote control.

x Do not place heavy objects on the remote control, or step on it.

Operation failure with the remote control

x Are the batteries running down?
“Setting the batteries” above.
Replace the batteries with new ones and retry the operation.

x If the operation fails, operate the unit with temporary run operation function. “Temporary run operation” below.
Contact your dealer to have the remote control checked.

Temporary run operation

x The unit ON/OFF button on the unit operates ON/OFF temporarily when the remote control is not used. Operation program

· OPERATION MODE : AUTO

· FAN SPEED

: AUTO

· AIR FLOW

: AUTO

x Operation starts by pressing the unit ON/OFF button; it stops if you press the button again.

Unit ON/OFF button

NOTICE
x Do not keep pressing the unit ON/OFF button down for 5 seconds or more. (Pressing it 5 seconds or more sets the forced cooling operation used during servicing or when relocating the air-conditioner.)

EN-10

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

1 Remove the cover and take out batteries.
2 Disconnect the switching line next to the battery with wire cutters.
Disconnect

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 indoor unit and send a signal by pressing the ACL switch on the remote control.

Since the signal is sent in about 6 seconds after the ACL switch is pressed, point the remote control at the indoor unit for some time.

Reception peep

3 Insert batteries. Close the cover.

3 Check that the reception buzzer sound “peep” is emitted from the indoor unit.
At completion of the setting, the indoor unit emits a buzzer sound “peep”. (If no reception sound is emitted, start the setting from the beginning again.)

Child lock
This function locks the remote control operation to prevent an operation error.
1 Press the SET button for 3 seconds or more.
is displayed. When Child lock is set, only the ON/OFF button can be operated.
How to cancel
Turn off the light by pressing the SET button for 3 seconds or more.
NOTICE x While Child lock is set, the settings of operation mode, temperature, fan
speed and airflow direction cannot be changed. To change the settings, reset Child lock. x Child lock will not function during ALLERGEN CLEAR operation.

EN-11

Airflow range setting
Take the air-conditioner location into account and adjust the left/right airflow range to maximize air-conditioning.

1

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.

2

Press the AIR FLOW U/D (UP/DOWN) button and the AIR FLOW L/R (LEFT/RIGHT) button together for 5 seconds or more.
The airflow range setting display illuminates.

3

Setting the airflow range.
Press the AIR FLOW L/R (LEFT/RIGHT) button and adjust to the desired location. Each time the AIR FLOW L/R (LEFT/RIGHT) button is pressed, the display is switched in the order of:

(Center Installation)

(Right End Installation) (Left End Installation)

4

Press the ON/OFF button.
The air-conditioner’s airflow range is set. Press within 60 seconds of setting the airflow range (while the airflow range setting display illuminates).

Air-conditioner installation location and airflow range
The diagram below indicates the airflow ranges corresponding to the air- conditioner’s installation location. Consider your room’s layout and set the airflow range to maximize air-conditioning.

Airflow range (Left End Installation)

Airflow range (Center Installation)

Airflow range (Right End Installation)

NOTICE
x Once the airflow range setting is configured, it is stored in the air- conditioner even if the power source is turned off. To change the airflow range setting, set range again with the remote control.
x During the operation, an airflow range setting cannot be set. x When the air-conditioner is installed at the location within 50 cm from the wall, it is recommended to change the airflow range setting
to “Right End Installation” or “Left End Installation”.

EN-12

Operation and display section for remote control
Transmission section

OPERATION MODE select button Each time the button is pressed, the mode changes.
Page 14,16
TEMPERATURE button This button sets the room temperature.
Page 15,16
HI/ECO button This button changes the HIGH POWER/ ECONOMY operation.
Page 25

ON/OFF (luminous) button Press to start operation, press again to stop.
FAN SPEED button Each time the button is pressed, the fan speed changes.
Page 15
AIR FLOW (UP/DOWN) button This button changes the airflow (up/ down) direction.
Page 17

AIR FLOW (LEFT/RIGHT) button This button changes the airflow (left/ right) direction.
Page 17
SILENT button This button sets the SILENT operation.
Page 26

3D AUTO button This button sets 3D AUTO operation.
Page 17
NIGHT SETBACK button This button sets NIGHT SETBACK operation.
Page 26

ALLERGEN CLEAR button This button selects ALLERGEN CLEAR operation.
Page 20
ON TIMER button This button selects ON TIMER operation.
Page 19
OFF TIMER button This button selects OFF TIMER operation.
Page 18

SET/Child lock button Use this button to set the timer and Child lock.
Page 11
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.

WEEKLY button
This button switches the WEEKLY TIMER to ON/OFF.
Page 21
MENU switch
This switch selects the MENU function. Page 27

[View with the cover opened]

PROGRAM button
This button sets WEEKLY TIMER. Page 21

ACL switch

This switch resets the program to default

state.

Page 10, 14

SLEEP button
This button selects SLEEP operation. Page 18

The above illustration shows all controls, but in practice only the relevant parts are shown.

TIME SET UP switch
This switch is used for setting the time. Page 14

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 air-conditioner unit, a signal is transmitted. When the air-conditioner receives the signal correctly, it will beep.

EN-13

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.

1

Press the TIME SET UP switch.
Press with the tip of a ballpoint pen, etc. The day of the week display flashes, enabling the setting of a day of the week.

2 Press the ” or (TIMER)” button. (Set to Sat)

3

Press the SET button.
The day of the week display changes from flashing to steady lighting, completing the setting of a day of the week, and the time display flashes. Make sure to press the button within 60 seconds from 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 display changes from flashing to steady lighting and the setting is complete. Make sure to press the button within 60 seconds from the last operation in step 4, otherwise the time will not be set.

NOTICE

x The timer operation works based on the time clock, so set it correctly.
x The remote control data will be reset when the present time is set.

x When the battery of the remote control is replaced or the ACL switch is pressed, the remote control will be set to the initial state. Since the WEEKLY TIMER program is not set in the initial state, set the program according to the setting procedure.

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

1

Press the MODE button.
The mode changes whenever the button is pressed. Set to .

2 Press the ON/OFF button.

To stop:

Press the ON/OFF button.

x If you do not want the AUTO mode program, change to COOL, HEAT or FAN

instead of AUTO.

Page 16

x Airflow direction adjustment procedure. Page 17

NOTICE
x In case air is not blowing out during the operation. Page 34

EN-14

Temperature adjustment during AUTO mode
Default preset temperature during AUTO mode is 24 °C for both cooling and heating mode. However, it can be adjusted (Minimum 18 °C, Maximum 30 °C) using button or button.
1 Press the” or (TEMP)” button.
When it is a little cold Press the button. Each time the button is pressed, the switch over occurs in the following order
18 19 ………… 23 24 25 ……… 30. When 30 is indicated, even if the button is pressed, the indicator does not change.
When it is a little hot Press the button. Each time the button is pressed, the switch over occurs in the following order
30 29 ………… 25 24 23 ……… 18. When 18 is indicated, even if the button is pressed, the indicator does not change.

FAN SPEED
The FAN SPEED can be set except for DRY mode.

1

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

AUTO

ULo

Lo

Me

Hi

Operation capacity by your choice Set automatically by microcomputer Silent operation Energy-saving operation Standard operation Powerful operation with high capacity

FAN SPEED AUTO ULo Lo Me Hi

NOTICE
x When FAN SPEED is changed from Hi to Lo or ULo, the sound of refrigerant may be heard.
x When COOL mode is used if outside temperatures are low, the FAN SPEED may change automatically to protect the air-conditioner.

EN-15

COOL/HEAT/DRY/FAN mode operation

1

Press the MODE button.
Set to a required mode.
(COOL), (HEAT), (DRY), (FAN)

2 Press the ON/OFF button.

3

Press the TEMP button.

Press or button for the preferred temperature.

Recommendation COOL
26 °C – 28 °C

HEAT 22 °C – 24 °C

DRY 24 °C – 26 °C

FAN —

Airflow direction adjustment procedure.

Page 17

4

Press the FAN SPEED button
Set the fan speed as preferred. A fan speed cannot be set under DRY operation.

Page 15

NOTICE

x In case air is not blown out, when starting the heating

operation.

Page 34

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

To stop:

Press the ON/OFF button.

Air-conditioner operation temperature range
Use within the following operational range. Operating outside of this range may result in the protection devices being activated and preventing the unit from working.

COOL mode operation

HEAT mode operation

Outside temperature Approximately -15 to 46 °C

Approximately -15 to 24 °C

Inside temperature Inside humidity

Approximately 18 to 32 °C

Approximately 10 to 30 °C

Below approximately 80 % 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

Capacity of HEAT mode operation
x As a characteristic of heat pump system, the heating capacity reduces when the outside air temperature gets colder. x It may take some time to supply warm air after turning on the air-conditioner. x 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 the heating operation stops for 5 to 15 minutes during defrosting. x Both indoor and outdoor fans stop and the RUN light flashes slowly (1.5 seconds ON, 0.5 seconds OFF) during defrosting. x The outdoor unit may release some steam during defrosting. This is to help the defrosting process and is not a defect. x The HEAT operation resumes as soon as defrosting has been completed.
EN-16

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)

Left/right direction can be adjusted with the AIR FLOW L/R (LEFT/RIGHT) button on the remote control. Every time you press this button, the mode changes as follows:
Change on AIR FLOW (LEFT/RIGHT) mode.
(Louver stopped)

NOTICE

(Swing)

x The actual position of the flap and louver may differ from the display shown.

NOTICE FOR HEATING OPERATION

x When heating operation starts, the flap and louver direction is fixed at the horizontal/center position in order to avoid cold draft. It returns to the set position when the warm air supply is started.
x The flap and louver direction will be controlled to the horizontal/center position when the room temperature reaches the set temperature and compressor stops or when defrosting is in operation.
x The airflow direction cannot be set during the period mentioned above. Change the airflow direction settings after the warm air is supplied and the flap/louver goes to the set position.

Memory flap (Flap or louver stopped)

When you press the AIR FLOW (U/D or L/R) button once while the flap or louver is operating, it stops swinging at the position.

Since this angle is memorized in the microcomputer, the flap or louver will automatically be set at this angle when the next

operation is started.
WARNING x Do not expose directly to airflow from the air-conditioner for a long time.

x Recommended angle of the flap when stopping

CAUTION x When in COOL or DRY operation, do not operate for a long period with the
airflow blowing straight down. Otherwise, condensation may appear on the outlet grill and drip down.
x Do not try to adjust the flap and louver by hand, as the control angle may change or the flap or louver may not be closed completely.

HEAT COOL, DRY

(Slant forward blowing)
(Horizontal blowing)

3D AUTO operation
Fan speed and airflow direction are automatically controlled, allowing the entire room to be efficiently air-conditioned. When the air-conditioner is turned off, start the operation from Step 1. When the air-conditioner is running, start from Step 2.

1 Press the ON/OFF button.

2

Press the 3D AUTO button.

Each time the 3D AUTO button is pressed, the display is switched in the order of:

No display

(3D AUTO)

(Normal operation)

How to cancel
Press the 3D AUTO button to turn off the 3D AUTO display.

NOTICE
x 3D AUTO operation is canceled when you switch the operation mode. x If 3D AUTO operation is canceled then the airflow direction changes to that
used before 3D AUTO was set. x 3D AUTO operation can be set in AUTO, COOL, or HEAT operation mode only.
EN-17

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.

Page 20

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:
… (Units of one hour)
No display (canceled)

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.

Example: You prefer it to stop after 3 hours.

Set to

The timer light (yellow) is on.

The unit stops after the set time lapses.

NOTICE
x SLEEP TIMER operation cannot be set simultaneously with OFF TIMER operation or ALLERGEN CLEAR operation.

OFF TIMER operation
The unit stops automatically when the set time comes. When the air-conditioner is turned off, start the operation from Step 1. When the air-conditioner is running, start from Step 2. Example: You prefer it to stop 22:30.
1 Press the ON/OFF button.

2

Press the OFF TIMER button.
OFF TIMER display is flashing.

3

Press the ” or (TIMER)” button.
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 (Units of ten minutes)

Set at 22:30.

4

Press the SET button.
The display changes from flashing to steady lighting and the setting is complete. The timer light (yellow) is on.

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.

NOTICE
x The unit stops at the end of the set period of time. x Make sure to press the button within 60 seconds from the last operation
in step 3, otherwise the setting is not completed. x The current time is not displayed during OFF TIMER operation. x OFF TIMER operation will not function during ALLERGEN CLEAR
operation. x Different from SLEEP TIMER operation, automatic set temperature
adjustment is not done during OFF TIMER operation.
EN-18

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. Example: When the preferred room temperature is required at 8:00.

1

Press the ON TIMER button.
ON TIMER display flashing.

Page 20

Changing of set time
Set a new time by using the ON TIMER button.
How to cancel
Press the CANCEL button to turn off the timer display.

2

Press the ” or (TIMER)” button.
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 (Units of ten minutes)
Set at 8:00.

3

Press the SET button.
The display changes from flashing to steady lighting and the setting is complete. The timer light (yellow) is on. If ON TIMER setting is performed when air-conditioner is running, air-conditioner operation will stop.

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

SLEEP TIMER + ON TIMER operation
This is the 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 18.
Set to
2 ON TIMER operation setting
Set by the above procedure mentioned in ON TIMER. Set to The setting of the lighting of the timer light (yellow) of this unit is complete.
x After the SLEEP TIMER set time has lapsed, the operation stops, and it starts from 5 to 60 minutes before the ON TIMER’s set time.
x The timer light is turned off when ON TIMER set time comes.

Changing of set time
Set a new time by using the SLEEP or ON TIMER button.

How to cancel
Press the CANCEL button to turn off the timer display.
EN-19

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.

1 OFF TIMER operation setting

Set by the procedures on page 18.

Set to

2 ON TIMER operation setting

Set by the procedures on page 19.

Set to

Timer light (yellow) on the unit will light when the setting is completed.
The set time will be displayed on the remote control. The display will change depending on the operational status.
x The air-conditioner stopping. First the air-conditioner starts running with ON TIMER. After the air-conditioner stops running with OFF TIMER.
x The air-conditioner running. First the air-conditioner stops running with OFF TIMER. After the air-conditioner starts running with ON TIMER.

Changing of set time
Set a new time by using the OFF TIMER or ON TIMER button.

NOTICE x Timer operation can be set only for next 24 hours.

How to cancel
Press the CANCEL or ON/OFF button to turn off the timer display.

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

called “Comfort start-up”.

x Mechanism

The room temperature is checked 60 minutes before the ON time. Depending on

In COOL operation (Stop) Operation starts

the temperature at that time,

the operation starts 5 to 60

(Operation)

minutes before the timer is at Set temperature

ON.

x The function is available

for COOL, HEAT and DRY operation mode (including AUTO).

Check the room Set time temp. 1 hour before.

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.

COOL operation

HEAT operation

+1.0 °C Set temperature
-1.0 °C
Set time

Set temperature -1.0 °C -2.0 °C -3.0 °C

1 hour 2 hour

-6.0 °C Set time 30 minutes 1 hour 2 hour

ALLERGEN CLEAR operation
Enzyme technology is used to eliminate allergens that accumulate on the “Allergen clear filter”.

1 Press the ALLERGEN CLEAR button.

To stop:

Press the ON/OFF or ALLERGEN CLEAR button.

NOTICE
x Since the room temperature may change quite a bit, it is recommended that this be used when no one is in the room. (It completes automatically in approximately 90 minutes.)
x During ALLERGEN CLEAR operation temperature, fan speed, airflow direction and timer operations settings cannot be made.
x In case of SCM multi system, ALLERGEN CLEAR control function is invalid.
x In case of SCM multi system, if ALLERGEN button is pressed by mistake, the indoor unit which received such command will stop.
EN-20

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.

Sample (At cooling season)

: WEEKLY TIMER setting

: MANUAL setting

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

1

Press the WEEKLY button.

The WEEKLY TIMER becomes effective. Every time the WEEKLY button is pressed, the display is switched in the order of:

No display

(WEEKLY TIMER on)

(WEEKLY TIMER off)

When the WEEKLY TIMER is set to ON, the timer light (yellow) of the air- conditioner is on. When the battery of the remote control is replaced or the ACL switch is pressed, the remote control is set to the initial state. Since the WEEKLY TIMER program is not set in the initial state, set the program according to the setting procedure.

NOTICE

x The WEEKLY TIMER is switched to ON/OFF regardless of whether the air- conditioner is running or not.
x The ON TIMER operation of the WEEKLY TIMER is effective regardless of whether the air-conditioner is running or not. When the ON TIMER setting time is reached, the remote control operates according to the contents that are set. The remote control display is also switched to the operation contents that are set. The setting can be changed from the remote control after ON TIMER operation of the WEEKLY TIMER. The following contents can be set by the ON TIMER. Operation mode, fan speed, temperature, airflow direction, ECONOMY, 3D AUTO, NIGHT SETBACK, SILENT Comfort start-up is not performed for WEEKLY TIMER ON TIMER operation.

x OFF TIMER operation of the WEEKLY TIMER is effective only when the air- conditioner is running. When the time set by the OFF TIMER is reached, the air-conditioner stops.
x When multiple program numbers are set for the current day (day of the week), the operation is performed from the earliest time that is set.
x If any timer operation (ON TIMER, OFF TIMER or SLEEP TIMER) in addition to the WEEKLY TIMER operation is set, operation will not start according the ON TIMER/OFF TIMER settings specified with the WEEKLY TIMER operation. After canceling all other timer operations (ON TIMER, OFF TIMER and SLEEP TIMER), switch on the WEEKLY TIMER operation.
x The ON TIMER or OFF TIMER of the same time in the same day of the week cannot be set.
x In case WEEKLY TIMER setting is not sent to the unit, TIMER light will not turn on even if the WEEKLY button is pressed and is displayed on the remote control.

EN-21

Setting mode

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

1 Press the PROGRAM

button.

and current day of the week flash.

2

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:
Mon Tue Wed … Sun Display of all of the days of the week
Every time the button is pressed, the display is switched in the order of:
Mon Display of all of the days of Sun Sat … Tue the week

3

Press the SET button.
The day of the week is determined and the program number flashes.

4

Press the ” or (TIMER)” button.

Select a program number.

Every time the button is pressed, the display is switched in the

order of:

P1

P2

P3

P4

Every time the order of:
P1

button is pressed, the display is switched in the

P4

P3

P2

5

Press the SET button.
When no set contents (ON TIMER or OFF TIMER) are available, both the and timers flash.
When set contents (ON TIMER or OFF TIMER) are available, either or timer flashes.

6

Press the ON TIMER or OFF TIMER button.
ON TIMER or OFF TIMER is determined and time display flashes. ON TIMER is selected OFF TIMER is selected

EN-22

7

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 (Units of ten minutes)
When ON TIMER is selected, go to Step 8. When OFF TIMER is selected, go to Step 9.

8

Set operation contents.
When ON TIMER is selected, operation mode, fan speed, and airflow direction can be changed and the ECONOMY, SILENT or NIGHT SETBACK operation can be set.

9

Press the SET button.
The time and operation contents are determined and and flash.

10

Press the PROGRAM

button.

Settings are sent to the air-conditioner. Point the remote control towards the remote control signal receiver of the indoor unit, press the PROGRAM button, and then wait 3 seconds. After 3 seconds, the settings are sent to the air- conditioner, which emits a reception buzzer sound three times (pip, pip, pip). If the buzzer sound is not emitted, press the PROGRAM button again to send the settings.

Setting mode
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.
NOTICE
x 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. Subsequently, and all the program numbers (P1, P2, P3 and P4) flash for 10 seconds. (This flashing can not be observed if setting mode gets terminated while setting only one program.)
x At the end of the setting mode, point the remote control at the air- conditioner and press the PROGRAM button. In this case, check that the air- conditioner emits a reception buzzer sound three times (pip, pip, pip). If the buzzer sound is not emitted, set the mode to the setting mode again by pressing the PROGRAM button and check that the buzzer sound is emitted.

EN-23

How to cancel the setting

1

Press the PROGRAM

button.

and current day of the week flash.

2

Press the ” or (TIMER)” button.
Select a day of the week to be canceled.

3

Press the SET button.
The day of the week is determined and the program number flashes.

4

Press the ” or (TIMER)” button.
Select a program number to be canceled. At cancelation operation, do not press the SET button. If the SET button is pressed, the mode is shifted to the Set mode.

5 Press the CANCEL button.

The setting contents of the ON or OFF TIMER are canceled and

is

displayed on the time display section.

6

Point the remote control towards the remote control signal receiver of the indoor unit.

Press the PROGRAM

button.

When the PROGRAM button is pressed, the setting is sent to the air- conditioner. When the setting is received, a buzzer sound (pip, pip, pip) is emitted. The setting contents of each program are canceled. Perform the operation indicated above for each program to be canceled.

How to cancel the setting

When the same operation contents exist in the same program number of all the days of the week, collective erase is allowed. In Step 2 above, select “all of the days of the week”. The procedure from Step 3 is the same as that indicated above.
If the operation contents have been changed or erased by individual setting after the collective setting described in page 23, causing setting content discrepancies among the days of the week, collective erase is not allowed.

Confirm mode

The WEEKLY TIMER setting contents can be confirmed.

1

Press the PROGRAM

button for 3 seconds or more.

flashes and the setting content lights.

2

Press the ” or (TIMER)” button.

Select a day of the week and a program number to be confirmed.

Display starts from the current day of the week. For the program without

setting,

is displayed. When the PROGRAM button is pressed in

Confirm mode, a setting mode is set.

Mon

P1

P2

P3

P4

Tue

P1

P2

P3

P4

Sun

P1

P2

P3

P4

Display of all of the days of the week

P1

P2

P3

P4

How to cancel
The Confirm mode can be terminated by pressing the ON/OFF, CANCEL or SET button.

NOTICE
x If no operation is performed for 60 seconds in Confirm mode, the Confirm mode is terminated.
EN-24

HIGH POWER/ECONOMY operation
When the air-conditioner is turned off, start the operation from Step 1. When the air-conditioner is running, start from Step 2.

1 Press the ON/OFF button.

2

Press the HI/ECO button.
x When the operating mode is AUTO, COOL or HEAT Every time the HI/ECO button is pressed, the display is switched in the order of:
No display

(HIGH POWER) (ECONOMY)

(Normal operation)

x When the operating mode is DRY or ON TIMER + OFF TIMER Every time the HI/ECO button is pressed, the display is switched in the order of:

No display

(ECONOMY)

(Normal operation)

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 is disappeared.

NOTICE

x During the HIGH POWER operation, the room temperature is not controlled. When it causes an excessive cooling or heating, press the HI/ECO button again to cancel the HIGH POWER operation.
x HIGH POWER operation is not available during the DRY and ON TIMER + OFF TIMER operations.
x When HIGH POWER operation is set after setting ON TIMER operation, HIGH POWER operation will start from the set time.
x After HIGH POWER operation, the sound of refrigerant flowing may be heard.

x When the following operations are set, HIGH POWER
operation will be canceled.
When the HI/ECO button is pressed again. (The operation mode will be changed to the ECONOMY operation)
When the operation mode is changed. When it has been 15 minutes since HIGH POWER
operation has started.
When the 3D AUTO button is pressed. When the SILENT button is pressed. When the NIGHT SETBACK button is pressed.
x Not operable while the air-conditioner is OFF.

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 displays and the FAN SPEED display is disappeared.

NOTICE
x It will go into ECONOMY operation at the next time the airconditioner runs in the following case. When the air-conditioner is stopped by ON/OFF button during ECONOMY operation. When the air-conditioner is stopped in SLEEP or OFF TIMER operation during ECONOMY operation. When the operation is retrieved from SELF CLEAN or ALLERGEN CLEAR operation.

x When the following operations are set, ECONOMY operation
will be canceled. When the HI/ECO button is pressed again. When the operation mode is changed from DRY to
FAN.
When the NIGHT SETBACK button is pressed.
x Not operable while the air-conditioner is OFF.

EN-25

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.
Every time the NIGHT SETBACK button is pressed, the display is switched in the order of:

(NIGHT SETBACK on)

No display (NIGHT SETBACK off)

How to cancel
Press the NIGHT SETBACK button or MODE button to turn off the NIGHT SETBACK display.

NOTICE
x During NIGHT SETBACK operation, the air-conditioner maintains the set temperature at about 10 °C.
x During NIGHT SETBACK operation, temperature settings cannot be made. x Since the room temperature may change quite a bit, it is recommended
that this be used when no one is in the room. x During NIGHT SETBACK operation, HIGH POWER and ECONOMY
operations cannot be set. x 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. x With this function, the air-conditioner maintains the room temperature at 10 °C during cold seasons (heating operation). The air-conditioner does not maintain the temperature at 10 °C during the hot/warm seasons (cooling operation). When the room temperature is higher than 10 °C, the fan will stop or operate at a low speed.

SILENT operation
When the SILENT operation is set, the unit operates more silently to reduce noise from the outdoor unit. When the air-conditioner is turned off, start the operation from Step 1. When the air-conditioner is running, start from Step 2.
1 Press the ON/OFF button.

2

Press the SILENT button.

When the operating mode is AUTO, COOL, HEAT or NIGHT SETBACK Every time the SILENT button is pressed, the display is switched in the order of:

(SILENT on)

No display (SILENT off)

How to cancel
Press the SILENT button to turn off the SILENT display.
NOTICE
x During SILENT operation, the maximum cooling and heating capacities deteriorate.
x SILENT operation will not function during DRY and FAN operation. x 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 SELF CLEAN or ALLERGEN
CLEAR operation. x Not operable while the air-conditioner is OFF. x The noise level of the outdoor unit may not decrease depending on the
condition. x In the case of connecting to the specific outdoor unit (SCM40/45ZS-S,
SCM100/125ZM-S), SILENT control function becomes invalid.
EN-26

MENU function
MENU function is used for setting the Display brightness adjustment, SELF CLEAN operation, Fan control in heating thermo – OFF, PRESET operation, Wireless LAN connection setting, and Wireless LAN communication setting.
1 Every time the MENU switch is pressed with the tip of a ballpoint pen, etc., the display is switched in order of:

Display brightness adjustment
Wireless LAN communication setting

SELF CLEAN operation

Fan control in heating thermo – OFF

Wireless LAN connection setting

PRESET operation

Wireless LAN connection setting
For Wireless LAN connection setting, refer to another user’s manual.
NOTICE x If the communication status is poor due to radio wave interference by an obstacle, microwave oven and so on, the operation contents
may not be reflected. Check the operational status periodically. x The operation contents of your smartphone are not reflected to the remote control display. The contents set by the remote control
are reflected to the application (Smart M-Air).
Display brightness adjustment
This function can be used when it is necessary to adjust the brightness of unit display.
1 Select the Display brightness adjustment by pressing the MENU switch.
2 Select the brightness level by pressing ” or (TIMER)” button.

100 %

50 %

(Default)

3 Press the SET button.

0 % (Turned off)

EN-27

SELF CLEAN operation
SELF CLEAN operation should be run after AUTO, COOL and DRY operation to remove the moisture from inside of the indoor unit and control the growth of mold and bacteria.
1 Select the SELF CLEAN operation by pressing the MENU switch.
2 Select SELF CLEAN on by pressing ” or (TIMER)” button.

SELF CLEAN off (Default)
3 Press the SET button.

SELF CLEAN on

NOTICE

x Two hours later, the air-conditioner stops SELF CLEAN operation automatically. To stop the air-conditioner immediately, press the ON/OFF button.
x SELF CLEAN operation is not operated after HEAT, FAN, OFF TIMER, SLEEP and ALLERGEN CLEAR operations have finished.
x The indoor unit fan runs for about two hours in SELF CLEAN operation. x The RUN light illuminates during SELF CLEAN operation.
3 seconds
ON

OFF

1 second

x Pressing the SLEEP button, ALLERGEN CLEAR button or NIGHT SETBACK button during SELF CLEAN operation cancels the SELF CLEAN operation and then the unit is set to SLEEP, ALLERGEN CLEAR or NIGHT SETBACK operation.
x This is not a function for removing mold, germs or grime that have already adhered to the unit.

EN-28

Fan control in heating thermo – OFF
When the room temperature reaches the set temperature during heating operation, the heating thermostat turns OFF. Fan control in heating thermo – OFF can be selected.
1 Select the Fan control in heating thermo – OFF by pressing the MENU switch.
2 Select the Fan control by pressing the ” or (TIMER)” button.

function

Normal function

Fireplace function

Interval function

Stop function

The air-conditioner controls the FAN SPEED automatically.
The unit operates at the FAN SPEED set by the remote control. Heat generated from other heat sources can be circulated in the room by operating the indoor fan continuously.
The indoor fan starts and stops the operation at regular intervals in order to avoid cold draft during heating thermo – OFF.
The indoor fan stops. To use this function additional work is required, so consult your dealer. Otherwise, it may take time to return to heating and the heating capacity may be insufficient.

3 Press the SET button.

NOTICE
x Once Fan control in heating thermo – OFF is configured, it is stored in the air-conditioner even if the power source is turned off. To change Fan control in heating thermo – OFF, set again with the remote control.
x In case of SCM multi system, Fireplace function may warm the room excessively.

EN-29

PRESET operation
This operation can save the preferred setting for future operation.
1 Select the PRESET operation by pressing the MENU switch.
2 Select preferred OPERATION MODE, TEMPERATURE, FAN SPEED and AIR FLOW direction.
3 Press the SET button.

4

When air -conditioner is operating AUTO, COOL, HEAT, DRY, FAN and NIGHT SETBACK, press MODE button 3 seconds or more. PRESET operation will start.

NOTICE
x When pressing MODE button for PRESET operation during the 3D AUTO or HIGH POWER operation, it will be canceled.
x When pressing MODE button for PRESET operation during the ECONOMY operation, it will continue.

EN-30

Wireless LAN communication setting
The wireless LAN communication setting can be switched between ON and OFF. Wireless LAN communication setting can be set regardless of whether the air- conditioner is running or not.
1 Select the Wireless LAN communication setting by pressing the MENU switch.
2 Select the Wireless LAN communication setting by pressing ” or (TIMER)” button.

Initial display

Wireless LAN communication ON

3 Press the SET button.

Wireless LAN communication OFF

NOTICE
x Once Wireless LAN communication setting is configured, it is stored in the air-conditioner even if the power source is turned off. To change Wireless LAN communication setting, set again with the remote control.
x If the Wireless LAN communication setting is set to OFF, the Wireless LAN connection function will be unavailable.

Initialization of wireless LAN interface
If you want to reset the wireless LAN interface, it can be initialized to the status at the time of purchase. When the wireless LAN interface is initialized, data of such as the network setting is erased.

1

If the air-conditioner is running, press the ON/OFF button to stop.
The initialization of the wireless LAN interface cannot be made while the unit is running.

2 Press the OFF TIMER button and the 3D AUTO button together for 5 seconds or more. The AC display on the remote control blinks.

3

Press the SET button for 5 seconds.
When completed, RUN light and TIMER light flash twice.

How to cancel
Press the CANCEL button to turn off the setting display.

NOTICE
x Be sure to initialize the interface when the user of the air-conditioner changes or the air-conditioner is disposed of.

EN-31

Maintenance

Before maintenance
Turn off the power source.

During the operational season

Cleaning the air filter
1 Remove the air filter

Standard interval is once every two week
x Pull up the air inlet panel forward. x Lightly hold the knobs both sides and lift a little
to remove the panel forward.

x Do not spill any liquid to the unit.
x Do not touch the aluminum fins on the heat exchanger.
x Stand firmly on a stepladder or other stable object when removing the inlet panel and filter.
Do not use the following items:
x Hot water (40 °C or more) It may deform or discolour the unit.
x Petrol, paint thinner, benzine or cleanser, etc. I t m ay d e fo r m o r scratch the unit.

2

Cleaning If the filter is very dirty, clean it with warm water
(approx. 30 °C), and dry it thoroughly.
CAUTION
x Do not clean the filters with boiling water. x Do not dry them over an open flame. x Pull them out gently.

3 Reinstall the air filter

x Hold firmly the filter at both sides as shown at right and insert securely.
x Operating without the air filters will make the unit dusty, and may cause damage.
Cleaning the unit
x Wipe the unit with a soft, dry cloth, or use a vacuum cleaner. x If the unit is very dirty, wipe it with a cloth soaked in warm water.

Cleaning the air inlet panel
x The panel can be washed with water. After washing with water, wipe any moisture off the panel and dry it out of direct sunlight.

How to open and close the air inlet panel
Open
Place fingers at the corners on both sides of the panel and pull up the panel forward so that it will be open by about 70 degrees.

Close
Push both corners of the panel evenly and press further lightly at the center.

How to remove and install the air inlet panel

Removing
When removing the air inlet panel for internal cleaning or others, open the panel by 90 degrees and then pull it forward.

Installing
Insert the panel arm into the slot on the front panel from the position shown below, hold the panel at both ends of lower part, lower it downward slowly, then push it slightly until the latch works.

EN-32

Panel arm

Maintenance

NOTICE

x 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.
The unit consumes approx. 4 W even when the unit is not operating. Turning off the power source will help saving energy consumption and cost.

3 Clean and reinstall the air filters.

4 Clean both the indoor and outdoor units.

5 Remove batteries from the remote control.

At the beginning of the season
1 Ensure that the earth wiring is not snapped nor disconnected.
2 Make sure that 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.

Installing, inspecting and replacing the air-cleaning filter

1. Open the air inlet panel and remove the air filters.

Page 32

2. Remove the filter holders, with the air-cleaning filter installed in the holders, from the air-conditioner.

3. Remove the allergen clear filter (Light orange) from filter holder and inspect the filter. Use a vacuum cleaner to remove any dust or dirt from the allergen clear filter. Replace the allergen clear filter if it cannot be cleaned or if it has been for about 1 year. (The allergen clear filter should be replaced after about 1 year of used. However, the actual replacement period may vary depending on the conditions in which the filter is used.)

Remove the photocatalytic washable deodorizing filter (orange) from the filter holder and inspect the filter. Periodically, remove any dust or dirt from the photocatalytic washable deodorizing filter. If the photocatalytic washable deodorizing filter is particularly dirty, it may be washed with water. However, the filter is fragile so be sure to wash it installed in the filter holder to avoid damaging it. After washing the filter, place it in sunlight to dry. Placing the filter in sunlight restores the deodorizing effect.

(Do not dispose of the filter holders. They are reusable. )

4. Install the air-cleaning filter in the filter holders, and then install the filter holders in the air-conditioner.

NOTICE

x The allergen clear filter and the photocatalytic washable deodorizing filter may be installed on either the right or left side of the air-conditioner.
x Install the allergen clear filter with the light orange side on front side.

Filter

5. Install the air filters and close the air inlet panel.

Page 32

CAUTION x The heat exchanger may injure your fingers. x Stand firmly on a stepladder or other stable object when removing the inlet panel and filters.

For replacing the air-cleaning filter, contact your dealer.

Item Allergen clear filter

Feature
Enzyme technology is used to eliminate allergens that accumulate on the “Allergen clear filter”.

Photocatalytic washable Sources of odors on the filter are broken up, resulting in

deodorizing filter

a deodorizing effect.

Color Light orange
Orange

EN-33

Filter holder

Proper installation

Suitable installation position
x Do not put any obstruction in front of the indoor unit, preventing proper ventilation and functioning. x 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. x 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. x The air-conditioner and remote control must be at least 1 meter away from a TV set or radio. x 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. x Has the power source been turned on? x Is there a power failure or a blown fuse? Poor cooling or heating x Have you set the thermostat at a suitable temperature? x Is the air filter clean? (Not clogged?) x Have you left any doors or windows open? x Is there any direct sunlight entering the room? x Is there a heat source in the room? x Are there too many people in the room?

In the following cases, switch off the power and contact your dealer.
· If the air-conditioner does not operate properly after you have checked the left points.
· If any doubt still exists after you have consulted the Notice (page 34 – 35).
· If things happen as shown on page 36.

Notice

Airflow

Air is not blown out when starting the HEATING operation. RUN light flashes slowly
(1.5 seconds ON, 0.5 seconds OFF)
Air is not blown out for 5 to 15 minutes or cool air is blown out for a moment at HEATING operation.
RUN light flashes slowly (1.5 seconds ON, 0.5 seconds OFF)
Air is not blown out when starting the DRY operation.
(RUN light is on)

Airflow has stopped to prevent blowing out of cold air until the indoor heat exchanger has warmed up. (2 to 5 minutes)
When outdoor temperature is low and humidity is high, the unit sometimes performs defrosting automatically. Please wait. During defrosting, water or steam may release from the outdoor unit.
The indoor fan may stop to prevent re-evaporation of dehumidified moisture and to save energy.

EN-34

Notice

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.
In case of SCM multi system, sometimes a “Shooooo” sound might come for a short time from the unit that is turned off.

This is caused by refrigerant moving within the unit.
This is caused by heat expansion or contraction.
This is caused by the operation of the refrigerant control valves or electric components.
This means that the rotation speed of the compressor is increasing or decreasing.
This is the sound when operation of another indoor unit is stopped.

Operation
The timer function is canceled.
The wireless remote control display and operating conditions do not match.

Timer function used with wired remote control / WF-RAC (Smartphone) The following timer functions that have be set from the wireless remote control are cancelled when the operating status of the indoor unit changes due to signals from the wired remote control or WF-RAC (Smartphone). At this time, the operational status of the indoor unit is different from the wireless remote control display. Therefore it is recommended to only set one of the timers. · SLEEP TIMER operation · OFF TIMER operation · ON TIMER operation · SLEEP TIMER + ON TIMER operation · ON TIMER + OFF TIMER operation

Others

The unit does not restart immediately after you have stopped it.
(RUN light is on)
Some steam releases 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 is stopped.
RUN light stays on even though operation was stopped.

Restart is blocked for 3 minutes after you have stopped the operation to protect the unit.
The 3 minutes protection timer in the microcomputer automatically starts it up again.
This may occur if the room’s temperature and humidity are very high. It disappears as soon as the temperature and humidity decrease. Close all windows and doors to prevent outside humidity from entering.
Air blown out during operation may smell. This is caused by tobacco or cosmetics adhering to the unit.
If the auto restart function is not set, the unit will not restart automatically. Use the remote control to start the operation again.
Remote control signals may not be received if the signal receiver on the air- conditioner is exposed to direct sunlight or other bright light. If so, block the sunlight or reduce the other light.
If the unit is operated for a long time in high humidity, moisture may form on the air outlet grills and start dripping.
Indoor fan : Fan will not stop after 2 hours if set to SELF CLEAN operation.
Outdoor fan : Fan will not stop about a 1 minute period in order to protect the unit.
The RUN light illuminates during SELF CLEAN operation. Run light will turn off when SELF CLEAN operation ends.

EN-35

Contact your dealer

Turn off the power switch immediately and inform your dealer in any of the following situations: x The fuse or switch blows continuously. x The cable becomes extremely hot. The covering of the cable is cracked. x The TV, radio or other equipment starts to malfunction. x A switch does not activate properly. x A strange noise is heard during operation. x 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. x The RUN and TIMER lights on the unit display section flash quickly (in a 0.5 seconds interval) or the lights do not work.
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: x Timer settings x HIGH POWER operations
NOTICE
x 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.
x When power failure occurs, the timer setting is canceled. Once power is resumed, set the timer again.
About the multiple air-conditioners
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 change 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 flash quickly (in a 0.5 seconds interval).
Automatic Operation
· When the remote control operation switch is in the AUTO mode, the air- conditioner automatically selects either COOL or HEAT mode when operation is started depending on the room temperature.
· During simultaneous operation of air-conditioners, 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 mode. (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).
Fireplace function
· Depending on operation situation, the fan speed of the unit set to Fireplace function may change automatically in heating thermo OFF to protect the air- conditioner.
EN-36

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

TIMER light ON

RUN light 1-time flash 2-time flash 3-time flash 4-time flash 5-time flash

Description of trouble

Cause

Indoor heat exchanger sensor 1 · Broken heat exchanger sensor 1 wire, poor connector

error

connection

Room temperature sensor error

· Broken room temperature sensor wire, poor connector connection

Indoor heat exchanger sensor 3 · Broken heat exchanger sensor 3 wire, poor connector

error

connection

Trouble of Wireless LAN interface

· Defective Wireless LAN interface boards, poor connector connection

Circuit error

· Circuit failure or poor connector connection

6-time flash 7-time flash TIMER light

Indoor fan motor error
Refrigerant is insufficient Closed service valve

· Defective fan motor, poor connector connection
· Refrigerant is insufficient, leaking · Closed service valve

RUN light keeps flashing

1-time flash 2-time flash 4-time flash 5-time flash

Outdoor temperature sensor error · Broken outdoor sensor wire, poor connector connection

Outdoor heat exchanger sensor · Broken heat exchanger sensor wire, poor connector

error

connection

Discharge pipe sensor error

· Broken discharge pipe sensor wire, poor connector connection

Suction pipe sensor error

· Broken suction pipe sensor wire, poor connector connection

RUN light ON
RUN light 2-time flash RUN light 7-time flash

1-time flash 2-time flash 3-time flash 4-time flash 5-time flash 6-time flash 7-time flash Keep flashing
2-time flash
1-time flash

Current cut Trouble of outdoor unit Over current

· Compressor locking, open phase on compressor output, short circuit on power transistor, closed service valve
· Broken compressor wire · Compressor blockage
· Overload operation, overcharge of refrigerant

Power transistor error Over heat of compressor Error of signal transmission Outdoor fan motor error

· Broken power transistor
· Gas shortage, defective discharge pipe sensor, closed service valve
· Defective power source, broken signal wire, defective indoor/outdoor unit boards
· Defective fan motor, poor connector connection

Cooling high pressure protection

· Overcharge of refrigerant, short circuit of outdoor unit

Rotor lock

· Defective compressor · Open phase on compressor · Defective outdoor unit boards

Closed service valve

· Closed service valve

EN-37

EN-38

EU DECLARATION OF CONFORMITY

MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. 2-3, Marunouchi 3-chome, Chiyoda-ku, Tokyo, 100-8332, Japan

declare under our sole responsibility that the apparatus referred to in this declaration conforms with the following directives.

Description of apparatus: Split Type Air Conditioner Model name:

Conformity model list
[Indoor Unit]

Category SRK Series

Model SRK20ZT-WA SRK25ZT-WA

[Outdoor Unit] Category SRC Series

Model SRC20ZT-WA SRC25ZT-WA

Relevant EU Directives :
Machinery 2006/42/EC
Applied Standards / Regulations :
EN 60335-1 EN 60335-2-40
Authorised Representative in the EU : MHIAE SERVICES B.V.
Herikerbergweg 238, Luna ArenA, 1101 CM Amsterdam, Netherlands P.O.Box 23393 1100 DW Amsterdam, Netherlands

MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
2-3, Marunouchi 3-chome, Chiyoda-ku, Tokyo, 100-8332, Japan https://www.mhi- mth.co.jp/en/
MITSUBISHI HEAVY INDUSTRIES AIR-CONDITIONING EUROPE, LTD.
5 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET, United Kingdom Tel : +44-333-207-4072 Fax: +44-333-207-4089 https://mhiae.com
MHIAE SERVICES B.V.
(Wholly-owned subsidiary of MITSUBISHI HEAVY INDUSTRIES AIR-CONDITIONING EUROPE, LTD.) Herikerbergweg 238, Luna ArenA, 1101 CM Amsterdam, Netherlands P.O.Box 23393 1100 DW Amsterdam, Netherlands Tel : +31-20-406-4535 http://www.mhiaeservices.com/

References

• Mitsubishi Heavy Industries Air Conditioning Europe - MHIAE
• PRODUCT WEBSITE | MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.

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