1.1About this document ...................................................................................................................................................... 4
2 General safety precautions5
2.1About the documentation .............................................................................................................................................. 5
2.1.1Meaning of warnings and symbols ................................................................................................................5
3.2Instructions for safe operation ....................................................................................................................................... 8
4 About the system12
4.1Indoor unit ...................................................................................................................................................................... 12
4.1.1Indoor unit display.......................................................................................................................................... 13
4.2About the user interface................................................................................................................................................. 13
4.2.1Components: User interface .......................................................................................................................... 14
4.2.2Status: User interface LCD.............................................................................................................................. 15
4.2.3To operate the user interface ........................................................................................................................ 16
5 Before operation17
5.1Overview: Before operation ........................................................................................................................................... 17
5.2To insert the batteries .................................................................................................................................................... 17
5.3To mount the user interface holder ............................................................................................................................... 18
5.4About the clock ............................................................................................................................................................... 18
5.4.1To set the clock ............................................................................................................................................... 18
5.5Brightness of the indoor unit display ............................................................................................................................. 19
5.5.1To set the brightness of the indoor unit display ............................................................................................ 19
5.6To turn on the power supply .......................................................................................................................................... 19
6.2When to use which feature ............................................................................................................................................ 20
6.3Operation mode and temperature setpoint .................................................................................................................. 21
6.3.1To start/stop operation mode and to set the temperature .......................................................................... 22
6.4.1To adjust the airflow rate ............................................................................................................................... 23
6.5Airflow direction ............................................................................................................................................................. 23
6.5.1To adjust vertical airflow direction ................................................................................................................ 24
6.5.2To adjust horizontal airflow direction ............................................................................................................ 24
6.5.3To use 3-D airflow direction ........................................................................................................................... 24
6.6Comfort airflow and Intelligent eye operation .............................................................................................................. 25
6.8Econo and Outdoor unit quiet operation....................................................................................................................... 27
6.8.2Outdoor unit quiet operation......................................................................................................................... 27
6.8.3To start/stop Econo and Outdoor unit quiet operation ................................................................................ 28
6.10.1To start/stop OFF timer operation................................................................................................................. 29
6.10.2To start/stop ON timer operation.................................................................................................................. 29
6.10.3To combine OFF timer and ON timer............................................................................................................. 30
6.12 Wireless LAN connection ................................................................................................................................................ 34
6.12.1Precautions when using the wireless LAN ..................................................................................................... 34
6.12.2To install the Daikin Residential Controller application................................................................................. 34
6.12.3To set the wireless connection ...................................................................................................................... 35
User reference guide
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ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
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Table of contents
6.13 About Multi system......................................................................................................................................................... 38
6.13.3Cooling/heating mode lock in Multi-system.................................................................................................. 39
7 Energy saving and optimum operation40
8 Maintenance and service42
8.1Overview: Maintenance and service .............................................................................................................................. 42
8.2To clean the indoor unit and user interface................................................................................................................... 43
8.3To clean the front panel ................................................................................................................................................. 44
8.4To remove the front panel.............................................................................................................................................. 44
8.5About the air filters......................................................................................................................................................... 44
8.6To clean the air filters ..................................................................................................................................................... 44
8.7To clean the titanium apatite deodorising filter and the silver allergen removal air purifying filter ........................... 46
8.8To replace the titanium apatite deodorising filter and the silver allergen removal air purifying filter........................ 46
8.9To re-install the front panel............................................................................................................................................ 47
8.10 To take following items into account before a long idle period .................................................................................... 47
9 Troubleshooting49
9.1Symptoms that are NOT system malfunctions............................................................................................................... 51
9.1.1Symptom: A sound like water flowing is heard ............................................................................................. 51
9.1.2Symptom: A blowing sound is heard.............................................................................................................. 51
9.1.3Symptom: A ticking sound is heard................................................................................................................ 51
9.1.4Symptom: A whistling sound is heard ............................................................................................................ 51
9.1.5Symptom: A clicking sound during operation or idle time is heard .............................................................. 51
9.1.6Symptom: A clapping sound is heard............................................................................................................. 52
9.1.7Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)........................................................ 52
9.1.8Symptom: The units can give off odours ....................................................................................................... 52
9.1.9Symptom: The outdoor fan rotates while the air conditioner is not in operation ....................................... 52
9.1.10Symptom: Indoor unit fan speed does not correspond with the setpoint (during low ambient cooling
operation in Multi system)............................................................................................................................. 52
9.2Solving problems based on error codes ......................................................................................................................... 52
9.3Troubleshooting for wireless LAN connection ............................................................................................................... 54
This document is part of a documentation set. The complete set consists of:
▪ General safety precautions:
INFORMATION
This appliance is intended to be used by expert or trained users in shops, in light
industry, and on farms, or for commercial and household use by lay persons.
- Safety instructions that you must read before operating your system
- Format: Paper (in the box of the indoor unit)
▪ Operation manual:
- Quick guide for basic usage
- Format: Paper (in the box of the indoor unit)
▪ User reference guide:
- Detailed step-by-step instructions and background information for basic and
advanced usage
- Format: Digital files on http://www.daikineurope.com/support-and-manuals/
product-information/
Latest revisions of the supplied documentation may be available on the regional
Daikin website or via your installer.
The original documentation is written in English. All other languages are
translations.
User reference guide
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ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
2 General safety precautions
2.1 About the documentation
▪ The original documentation is written in English. All other languages are
translations.
▪ The precautions described in this document cover very important topics, follow
them carefully.
▪ The installation of the system, and all activities described in the installation
manual and in the installer reference guide MUST be performed by an authorised
installer.
2.1.1 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
2 | General safety precautions
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.
DANGER: RISK OF BURNING/SCALDING
Indicates a situation that could result in burning/scalding because of extreme hot or
cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.
WARNING
Indicates a situation that could result in death or serious injury.
WARNING: FLAMMABLE MATERIAL
CAUTION
Indicates a situation that could result in minor or moderate injury.
Indicates a situation that could result in equipment or property damage.
INFORMATION
Indicates useful tips or additional information.
User reference guide
5
2 | General safety precautions
Symbols used in the documentation:
SymbolExplanation
Before installation, read the installation and operation
manual, and the wiring instruction sheet.
Before performing maintenance and service tasks, read the
service manual.
For more information, see the installer and user reference
guide.
The unit contains rotating parts. Be careful when servicing or
inspecting the unit.
SymbolExplanation
Indicates a figure title or a reference to it.
Example: " 1–3 Figure title" means "Figure 3 in chapter 1".
Indicates a table title or a reference to it.
Example: " 1–3 Table title" means "Table 3 in chapter 1".
User reference guide
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ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
3 User safety instructions
Always observe the following safety instructions and regulations.
3.1 General
WARNING
If you are NOT sure how to operate the unit, contact your
installer.
WARNING
This appliance is not intended for use by persons, including
children, with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning
use of the appliance by a person responsible for their
safety.
3 | User safety instructions
Children should be supervised to ensure that they do not
play with the appliance.
Cleaning and user maintenance must not be carried out by
children without supervision.
WARNING
To prevent electrical shocks or fire:
▪ Do NOT rinse the unit.
▪ Do NOT operate the unit with wet hands.
▪ Do NOT place any objects containing water on the unit.
CAUTION
▪ Do NOT place any objects or equipment on top of the
This means that electrical and electronic products may NOT be mixed with
unsorted household waste. Do NOT try to dismantle the system yourself: the
dismantling of the system, treatment of the refrigerant, of oil and of other parts
must be done by an authorized installer and must comply with applicable
legislation.
Units must be treated at a specialized treatment facility for reuse, recycling and
recovery. By ensuring this product is disposed of correctly, you will help to
prevent potential negative consequences for the environment and human
health. For more information, contact your installer or local authority.
This means that the batteries may NOT be mixed with unsorted household
waste. If a chemical symbol is printed beneath the symbol, this chemical symbol
means that the battery contains a heavy metal above a certain concentration.
Possible chemical symbols are: Pb: lead (>0.004%).
Waste batteries must be treated at a specialized treatment facility for reuse. By
ensuring waste batteries are disposed of correctly, you will help to prevent
potential negative consequences for the environment and human health.
3.2 Instructions for safe operation
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
CAUTION
The indoor unit contains radio equipment, minimum
separation distance between the radiating part of the
equipment and the user is 10 cm.
CAUTION
Do NOT insert fingers, rods or other objects into the air
inlet or outlet. When the fan is rotating at high speed, it
will cause injury.
User reference guide
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ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
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3 | User safety instructions
WARNING
▪ Do NOT modify, disassemble, remove, reinstall or repair
the unit yourself as incorrect dismantling or installation
may cause an electric shock or fire. Contact your dealer.
▪ In case of accidental refrigerant leaks, make sure there
are no naked flames. The refrigerant itself is entirely
safe, non-toxic and mildly flammable, but it will
generate toxic gas when it accidentally leaks into a room
where combustible air from fan heaters, gas cookers,
etc. is present. Always have qualified service personnel
confirm that the point of leakage has been repaired or
corrected before resuming operation.
CAUTION
ALWAYS use a user interface to adjust the position of the
flaps and louvers. When the flaps and louvers are swinging
and you move them forcibly by hand, the mechanism will
break.
CAUTION
NEVER expose little children, plants or animals directly to
the airflow.
WARNING
Do NOT place objects below the indoor and/or outdoor
unit that may get wet. Otherwise condensation on the unit
or refrigerant pipes, air filter dirt or drain blockage may
cause dripping, and objects under the unit may get dirty or
damaged.
WARNING
Do NOT place a flammable spray bottle near the air
conditioner and do NOT use sprays near the unit. Doing so
may result in a fire.
CAUTION
Do NOT operate the system when using a room
fumigation-type insecticide. Chemicals could collect in the
unit, and endanger the health of people who are
hypersensitive to chemicals.
The refrigerant inside the unit is mildly flammable, but
normally does NOT leak. If the refrigerant leaks in the
room and comes in contact with fire from a burner, a
heater, or a cooker, this may result in fire, or the formation
of a harmful gas.
Turn off any combustible heating devices, ventilate the
room, and contact the dealer where you purchased the
unit.
Do NOT use the unit until a service person confirms that
the part from which the refrigerant leaked has been
repaired.
WARNING
▪ Do NOT pierce or burn refrigerant cycle parts.
▪ Do NOT use cleaning materials or means to accelerate
the defrosting process other than those recommended
by the manufacturer.
▪ Be aware that the refrigerant inside the system is
odourless.
WARNING
The appliance shall be stored in a room without
continuously operating ignition sources (example: open
flames, an operating gas appliance or an operating electric
heater).
DANGER: RISK OF ELECTROCUTION
To clean the air conditioner or air filter, be sure to stop
operation and turn all power supplies off. Otherwise, an
electric shock and injury may result.
CAUTION
After a long use, check the unit stand and fitting for
damage. If damaged, the unit may fall and result in injury.
User reference guide
10
CAUTION
Do NOT touch the heat exchanger fins. These fins are
sharp and could result in cutting injuries.
WARNING
Be careful with ladders when working in high places.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
3 | User safety instructions
WARNING
Improper detergents or cleaning procedure may cause
damage on plastic components or water leakage. Splashed
detergent on electric components, such as motors, may
cause failure, smoke or ignition.
DANGER: RISK OF ELECTROCUTION
Before cleaning, be sure to stop the operation, turn the
breaker off or pull out the supply cord. Otherwise, an
electric shock and injury may result.
WARNING
Stop operation and shut off the power if anything
unusual occurs (burning smells etc.).
Leaving the unit running under such circumstances may
cause breakage, electric shock or fire. Contact your dealer.
The refrigerant inside this unit is mildly flammable.
CAUTION
The indoor unit contains radio equipment, minimum separation distance between
the radiating part of the equipment and the user is 10 cm.
NOTICE
Do NOT use the system for other purposes. In order to avoid any quality
deterioration, do NOT use the unit for cooling precision instruments, food, plants,
animals, or works of art.
CAUTION
Do NOT insert fingers, rods or other objects into the air inlet or outlet. When the fan
is rotating at high speed, it will cause injury.
INFORMATION
The sound pressure level is less than 70dBA.
WARNING
▪ Do NOT modify, disassemble, remove, reinstall or repair the unit yourself as
incorrect dismantling or installation may cause an electric shock or fire. Contact
your dealer.
▪ In case of accidental refrigerant leaks, make sure there are no naked flames. The
refrigerant itself is entirely safe, non-toxic and mildly flammable, but it will
generate toxic gas when it accidentally leaks into a room where combustible air
from fan heaters, gas cookers, etc. is present. Always have qualified service
personnel confirm that the point of leakage has been repaired or corrected
before resuming operation.
INFORMATION
The following figures are just examples and may NOT completely match your system
layout.
User reference guide
12
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
4 | About the system
j
h
i
b
a
l
m
d
f
g
e
c
ON/
OFF
a
b
c
d
e
a Air inlet
b Air outlet
c Front panel
d Service cover
e Indoor unit display
f Intelligent eye sensor
g Room temperature sensor
h Only for class 20~35: Titanium apatite deodorising filter (without frame)
i Only for class 50: Titanium apatite deodorising filter and silver allergen removal air purifying filter (with
frame)
j Air filter
k Flaps (horizontal blades)
l Louvers (vertical blades)
4.1.1 Indoor unit display
a Signal receiver for user interface
b Operation lamp
c Timer lamp
d Intelligent eye lamp
e ON/OFF button
ON/OFF button
If the user interface is missing, you can use the ON/OFF button on the indoor unit
to start/stop operation. When operation is started using this button, the following
settings are used:
a User interface
b Screws (field supply)
c User interface holder
1Choose a place where the signals reach the unit.
2Attach the holder with screws to the wall or a similar location.
3Hang the user interface on the user interface holder.
5.4 About the clock
If the indoor unit's internal clock is NOT set to the correct time, the ON timer, OFF
timer and weekly timer will NOT operate correctly. The clock must be set again:
▪ After a circuit breaker has turned the unit OFF.
▪ After a power failure.
▪ After replacing batteries in the user interface.
5.4.1 To set the clock
Note: If the time is NOT set, , , and blink.
1Press .
2Press or to set the current day of the week.
DisplayDay of the week
Result: and blink
Monday
User reference guide
18
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
3Press .
Result: blinks.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
4Press or to set the correct time.
Note: Holding down or increases or decreases the time setting rapidly.
5Press .
Result: Setting is complete. blinks.
5.5 Brightness of the indoor unit display
Adjust the brightness of the indoor unit display as desired, or turn OFF the display.
5.5.1 To set the brightness of the indoor unit display
1Keep pressed for at least 2 seconds every time you need to change the
setting.
5 | Before operation
Result: Brightness will be changed in order: high, low, off.
5.6 To turn on the power supply
1Turn the circuit breaker on.
Result: The flap of the indoor unit will open and close to set the reference position.
What. The system operates differently, depending on the user selection.
INFORMATION
Operation modes: cooling, drying and automatic are NOT available for the heating
only version of the product.
SettingDescription
Automatic
The system cools down or heats up a room to
the temperature setpoint. It automatically
switches between cooling and heating if
necessary.
Drying
Heating
The system decreases the humidity in a room.
The system heats up a room to the temperature
setpoint.
Cooling
The system cools down a room to the
temperature setpoint.
Fan
The system only controls the airflow (airflow
rate and airflow direction).
The system does NOT control the temperature.
Additional info:
▪ Outside temperature. The system's cooling or heating effect decreases when the
outside temperature is too high or too low.
▪ Defrost operation. During heating operation, frost might occur on the outdoor
unit and decrease the heating capacity. In that case, the system automatically
switches to defrosting operation to remove the frost. During defrosting
operation, hot air is NOT blown from the indoor unit.
6.3.1 To start/stop operation mode and to set the temperature
User reference guide
22
: Unit is operating.
: Operation mode = Automatic
: Operation mode = Drying
: Operation mode = Cooling
: Operation mode = Heating
: Operation mode = Fan only
: Shows the set temperature.
1Press one or more times to select the operation mode.
Result: The mode will be set as follows:
2Press to start operation.
Result: and the selected mode are displayed on the LCD.
3Press or one or more times to lower or raise the temperature.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
6 | Operation
6.4 Airflow rate
Cooling operationHeating operation Automatic
operation
Drying or Fan only
operation
18~32°C10~30°C18~30°C—
Note: When using drying or fan only mode, you cannot adjust the temperature.
4Press to stop operation.
Result: disappears from the LCD. The operation lamp goes off.
1Press to choose:
5 airflow rate levels, from " " to " "
Automatic airflow rate operation
Indoor unit quiet operation. When the airflow rate is set to " ",
the noise from the unit will be reduced.
INFORMATION
▪ If the unit reaches the temperature setpoint in cooling or heating mode, the fan
will stop operating.
▪ When using drying operation mode, you CANNOT adjust the airflow rate setting.
6.4.1 To adjust the airflow rate
1Press to change the airflow setting as follows:
6.5 Airflow direction
When. Adjust the airflow direction as desired.
What. The system directs the airflow differently, depending on the user selection
(swinging or fixed position). It does so by moving horizontal blades (flaps) or
vertical blades (louvers).
Vertical automatic swing
Horizontal automatic
+ 3-D airflow direction
SettingAirflow direction
Moves up and down.
Moves from side to side.
swing
Moves alternately up and down and from side
to side
ALWAYS use a user interface to adjust the position of the flaps and louvers. When
the flaps and louvers are swinging and you move them forcibly by hand, the
mechanism will break.
The movable range of the flap varies according to the operation mode. The flap will
stop at the upper position when the airflow rate is changed to low during the up
and down swing setting.
a Flap range in cooling or drying operation
b Flap range in heating operation
c Flap range in fan only operation
1Press .
Result: appears on the LCD. The flaps (horizontal blades) will begin to
swing.
2To use fixed position, press when the flaps reach the desired position.
Result: disappears from the LCD. The flaps will stop moving.
6.5.2 To adjust horizontal airflow direction
1Press .
Result: appears on the LCD. The louvers (vertical blades) will begin to
swing.
2To use fixed position, press when the louvers reach the desired position.
Result: disappears from the LCD. The louvers will stop moving.
INFORMATION
When the unit is installed in a corner of a room, the direction of the louvers should
be facing away from the wall. Efficiency will drop if a wall blocks the air.
6.5.3 To use 3-D airflow direction
User reference guide
24
1Press and .
Result: and appear on the LCD. The flaps (horizontal blades) and
louvers (vertical blades) will begin to swing.
2To use fixed position, press and when the flaps and louvers reach
the desired position.
Result: and disappear from the LCD. The flaps and the louvers will
stop moving.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
6.6 Comfort airflow and Intelligent eye operation
You can use Comfort and Intelligent eye operation separately, or combine them.
6.6.1 Comfort airflow operation
This operation can be used in heating or cooling operation mode. It will provide a
comfortable wind that will NOT come in direct contact with people. The system
automatically sets the fixed airflow position upward in Cooling and downward in
Heating operation mode.
Cooling operation modeHeating operation mode
INFORMATION
Powerful and Comfort airflow operation CANNOT be used at the same time. The last
selected function takes priority. If the vertical automatic swing is selected, Comfort
airflow operation will be cancelled.
6 | Operation
6.6.2 Intelligent eye operation
The system detects movement in the room and automatically adjusts the airflow
direction and temperature in order to avoid direct contact with people. If no
movement is detected for 20 minutes, the system switches to energy saving
operation:
OperationEnergy saving operation
HeatingTemperature is lowered by 2°C.
Cooling and dryingIf the temperature in the room is:
Fan onlyDecreases airflow rate.
About the Intelligent eye sensor
▪ <30°C, the temperature is raised by 2°C
▪ ≥30°C, the temperature is raised by 1°C
NOTICE
▪ Do NOT hit or push the Intelligent eye sensor. Doing so may lead to malfunction.
▪ Do NOT place large objects near the Intelligent eye sensor.
INFORMATION
Powerful or Night set operation CANNOT be used at the same time with Intelligent
eye operation. The last selected function takes priority.
▪ Detection sensitivity. Changes according to location, the number of persons in
the room, temperature range, etc.
▪ Detection mistakes. The sensor may mistakenly detect pets, sunlight, moving
curtains, etc.
6.6.3 To start/stop Comfort and Intelligent eye operation
1Press one or more times.
Result: The setting will change as follows:
DisplayOperation
Horizontal angle (top view)
Comfort airflow
+
—Both deactivated
Note: If there are people close to the front of the indoor unit or there are too
many people, use both operations at the same time.
2To stop operation, press until both symbols disappear from the LCD.
6.7 Powerful operation
This operation quickly maximizes the cooling/heating effect in any operation mode.
You can get the maximum capacity.
ModeAirflow rate
Cooling/Heating▪ To maximize the cooling/heating
Intelligent eye
Comfort airflow and Intelligent eye
effect, the capacity of outdoor unit is
increased.
▪ The airflow rate is fixed to the
maximum setting.
▪ The temperature and airflow settings
CANNOT be changed.
User reference guide
26
Drying▪ The temperature setting is lowered by
2.5°C.
▪ The airflow rate is slightly increased.
Fan onlyThe airflow rate is fixed to the
maximum setting.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
INFORMATION
Powerful operation CANNOT be used together with Econo, Comfort airflow,
Intelligent eye and Outdoor unit quiet operation. The last selected function takes
priority.
Powerful operation will NOT increase the capacity of the unit if it already operates at
maximum capacity.
6.7.1 To start/stop Powerful operation
1Press to start.
Result: is displayed on the LCD. Powerful operation runs for 20minutes;
after that, operation returns to the previously set mode.
2Press to stop.
Result: disappears from the LCD.
Note: Powerful operation can be set only when the unit is running. If you press
or if you change operation mode, operation will be cancelled; disappears from
the LCD.
6 | Operation
6.8 Econo and Outdoor unit quiet operation
6.8.1 Econo operation
This is a function which enables efficient operation by limiting the maximum power
consumption value. This function is useful for cases in which attention should be
paid to ensure a circuit breaker will not trip when the product runs alongside other
appliances.
INFORMATION
▪ Powerful and Econo operation CANNOT be used at the same time. The last
selected function takes priority.
▪ Econo operation reduces power consumption of the outdoor unit by limiting the
rotation speed of the compressor. If power consumption is already low, Econo
operation will NOT further reduce power consumption.
6.8.2 Outdoor unit quiet operation
Use Outdoor unit quiet operation when you want to decrease the noise level of the
outdoor unit. Example: At night.
INFORMATION
▪ Powerful and Outdoor unit quiet operation CANNOT be used at the same time.
The last selected function takes priority.
▪ This function is only available in Automatic, Cooling, and Heating operation.
▪ Outdoor unit quiet operation limits the rotation speed of the compressor. If the
rotation speed of compressor is already low, Outdoor unit quiet operation will
NOT further reduce the compressor rotation speed.
6.8.3 To start/stop Econo and Outdoor unit quiet operation
1Press one or more times.
Result: The setting will change as follows.
DisplayOperation
Econo
Outdoor unit quiet
+Econo and Outdoor unit quiet
—Both deactivated
2To stop operation, press until both symbols disappear from the LCD.
Note: Econo operation can be only set when the unit is running. Pressing
cancels the setting and disappears from the LCD.
Note: remains on the LCD, even if you turn off the unit using the user interface
or indoor unit ON/OFF switch.
6.9 Flash Streamer (air cleaning) operation
Streamer generates a high-speed electron stream with a high oxidizing power,
reducing bad odours. Together with the titanium apatite deodorising filter, silver
allergen removal air purifying filter and the air filters, this function cleans the air in
the room.
INFORMATION
▪ The high-speed electrons are generated and go away inside the unit to ensure
safe operation.
▪ The Streamer discharge may generate a fizzing sound.
▪ If the airflow becomes weak, the Streamer discharge may stop temporarily to
prevent ozone smell.
6.9.1 To start/stop Flash Streamer (air cleaning) operation
Prerequisite: Make sure the unit is operating ( is displayed on the user
interface LCD).
1Press .
Result: is displayed on the LCD and the air in the room is cleaned when the
unit is operating.
6.10 OFF/ON timer operation
User reference guide
28
2To stop operation, press .
Result: disappears from the LCD and operation stops.
Timer functions are useful for automatically switching the air conditioner off/on at
night or in the morning. You can also use OFF timer and ON timer in combination.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
INFORMATION
Program the timer again in case of:
▪ A breaker has turned the unit off.
▪ A power failure.
▪ After replacing batteries in the user interface.
INFORMATION
The clock MUST be set correctly before using any timer functions. Refer to "5.4.1To
set the clock"[418].
6.10.1 To start/stop OFF timer operation
1Press to start.
Result: is displayed on the LCD and blinks. and the day of the
week disappear from the LCD.
6 | Operation
2Press or to change the time setting.
3Press again.
Result: and the set time are displayed on the LCD.
Result: The timer lamp lights up.
INFORMATION
Each time or is pressed, the time setting advances by 10 minutes. Holding
the button down will change the setting rapidly.
4To stop operation, press .
Result: and disappear from the LCD and the timer lamp goes off. and
the day of the week are displayed on the LCD.
INFORMATION
When you set the ON/OFF timer, the time setting is stored in the memory. The
memory will be reset when the user interface batteries are replaced.
Use of night set mode in combination with OFF timer
The air conditioner automatically adjusts the temperature setting (0.5°C up in
cooling, 2.0°C down in heating) to prevent excessive cooling/heating and ensure a
comfortable sleeping temperature.
3Hold for at least 2seconds to confirm the selection.
Result: is blinking. The operation and timer LEDs are blinking alternately in
1sinterval. Communication is OFF.
4Press to exit the menu.
Result: The display will return to the default screen.
In Multi system, 1 outdoor unit is connected to multiple indoor units.
6.13.1 Priority room setting
Priority room setting requires initial programming during installation. Please
consult your authorized dealer for assistance.
When priority room setting is inactive or not present
When more than 1 indoor unit is operating, priority is given to the first unit that
was turned on. Set other units to the same operation mode. Otherwise, they will
enter the standby mode, and the operation lamp will flash (does NOT indicate
malfunction).
Exceptions: If the first unit that was turned on is set to fan only, and then in the
other room heating mode is set, priority will be given to the unit set to the heating
mode. The first unit will go in standby and the operation lamp will flash.
Priority when using Outdoor unit quiet operation
INFORMATION
▪ The cooling, drying, and fan only operation modes may be used at the same time.
▪ The automatic operation mode automatically selects cooling or heating,
depending on the room temperature and the temperature setting. If the
automatic operation mode is selected for all units, all units will operate in the
mode of the first unit that was turned on.
User reference guide
38
Refer to "6.8.2Outdoor unit quiet operation"[427].
1Set Outdoor unit quiet operation in all rooms using the user interfaces of the
units.
2To cancel Outdoor unit quiet operation, you may stop operation in 1 room
using a user interface.
Result: Operation will stop in all rooms. will remain on the display of the
other user interfaces.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
3To remove the symbol from the other user interfaces, stop Outdoor unit quiet
operation in all rooms separately.
Result: The symbol will disappear.
When priority room setting is active
You can select a different operation mode for each room.
Example: Room A has priority, cooling operation mode is selected.
Operation mode in room B, C, D Status of room B, C and D
Cooling, drying or fan onlyCurrent operation mode maintained
HeatingStandby mode. Operation resumes when room
AutomaticIf cooling operation continues. If heating units
Priority when using Powerful operation
Example: Room A has priority. Rooms B, C and D are operating.
1Set Powerful operation in room A.
6 | Operation
A stops operating.
enter standby mode. Operation resumes when
room A stops operating.
Result: Capacity in room A is increased. Cooling or heating efficiency in rooms B, C
and D may be slightly reduced.
Priority when using Outdoor unit quiet operation
Example: Room A has priority.
2Set Outdoor unit quiet operation on one unit.
Result: All units enter the Outdoor unit quiet operation mode at once.
6.13.2 Night quiet mode
The Night quiet mode requires initial programming during installation. Please
consult your dealer for assistance. This mode reduces the operation noise of the
outdoor unit during the night by reducing the cooling efficiency.
The Night quiet mode is activated automatically when the temperature drops ≥5°C
below the highest temperature recorded that day.
6.13.3 Cooling/heating mode lock in Multi-system
The cooling/heating mode lock can be set via the Multi outdoor unit. Please
consult your authorized dealer for assistance. The cooling/heating mode lock sets
the unit forcibly to either cooling or heating operation. Activate this function if you
wish to set all indoor units connected in a Multi-system to 1 operation mode.
The Cooling/heating mode lock CANNOT be activated together with the priority room
setting.
User reference guide
39
7 | Energy saving and optimum operation
7 Energy saving and optimum operation
INFORMATION
▪ Even if the unit is turned OFF, it consumes electricity.
▪ When the power turns back on after a power break, the previously selected
mode will be resumed.
CAUTION
NEVER expose little children, plants or animals directly to the airflow.
WARNING
Do NOT place objects below the indoor and/or outdoor unit that may get wet.
Otherwise condensation on the unit or refrigerant pipes, air filter dirt or drain
blockage may cause dripping, and objects under the unit may get dirty or damaged.
WARNING
Do NOT place a flammable spray bottle near the air conditioner and do NOT use
sprays near the unit. Doing so may result in a fire.
CAUTION
Do NOT operate the system when using a room fumigation-type insecticide.
Chemicals could collect in the unit, and endanger the health of people who are
hypersensitive to chemicals.
Observe the following precautions to ensure the system operates properly.
▪ Prevent direct sunlight from entering a room during cooling operation by using
curtains or blinds.
▪ Make sure the area is well ventilated. Do NOT block any ventilation openings.
▪ Ventilate often. Extended use requires special attention to ventilation.
▪ Keep doors and windows closed. If the doors and windows remain open, air will
flow out of your room causing a decrease in the cooling or heating effect.
▪ Be careful NOT to cool or heat too much. To save energy, keep the temperature
setting at a moderate level.
▪ NEVER place objects near the air inlet or the air outlet of the unit. Doing so may
cause a reduced heating/cooling effect or stop operation.
▪ Turn off the main power supply switch to the unit when the unit is NOT used for
longer periods of time. If the main power supply switch is on, the unit consumes
electricity. Before restarting the unit, turn on the main power supply switch 6
hours before operation to ensure smooth running.
User reference guide
40
▪ Condensation may form if the humidity is above 80% or if the drain outlet gets
blocked.
▪ Adjust the room temperature properly for a comfortable environment. Avoid
excessive heating or cooling. Notice that it may take some time for the room
temperature to reach the set temperature. Consider using the timer setting
options.
▪ Adjust the air flow direction to avoid cool air from gathering on the floor or warm
air against the ceiling. (Up during cooling or dry operation to the ceiling and
down during heating operation.)
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
7 | Energy saving and optimum operation
▪ Avoid direct air flow to room inhabitants.
▪ Operate the system within the recommended temperature range (26~28°C for
The installer has to perform a yearly maintenance.
About the refrigerant
This product contains fluorinated greenhouse gases. Do NOT vent gases into the
atmosphere.
Refrigerant type: R32
Global warming potential (GWP) value: 675
NOTICE
Applicable legislation on fluorinated greenhouse gases requires that the refrigerant
charge of the unit is indicated both in weight and CO2 equivalent.
Formula to calculate the quantity in CO2 equivalent tonnes: GWP value of the
refrigerant × total refrigerant charge [in kg] / 1000
Please contact your installer for more information.
WARNING
The refrigerant inside the unit is mildly flammable, but normally does NOT leak. If the
refrigerant leaks in the room and comes in contact with fire from a burner, a heater,
or a cooker, this may result in fire, or the formation of a harmful gas.
Turn off any combustible heating devices, ventilate the room, and contact the dealer
where you purchased the unit.
Do NOT use the unit until a service person confirms that the part from which the
refrigerant leaked has been repaired.
WARNING
▪ Do NOT pierce or burn refrigerant cycle parts.
▪ Do NOT use cleaning materials or means to accelerate the defrosting process
other than those recommended by the manufacturer.
▪ Be aware that the refrigerant inside the system is odourless.
WARNING
The appliance shall be stored in a room without continuously operating ignition
sources (example: open flames, an operating gas appliance or an operating electric
heater).
NOTICE
Maintenance MUST be done by an authorized installer or service agent.
We recommend performing maintenance at least once a year. However, applicable
legislation might require shorter maintenance intervals.
User reference guide
42
DANGER: RISK OF ELECTROCUTION
To clean the air conditioner or air filter, be sure to stop operation and turn all power
supplies off. Otherwise, an electric shock and injury may result.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
WARNING
To prevent electrical shocks or fire:
▪ Do NOT rinse the unit.
▪ Do NOT operate the unit with wet hands.
▪ Do NOT place any objects containing water on the unit.
CAUTION
After a long use, check the unit stand and fitting for damage. If damaged, the unit
may fall and result in injury.
CAUTION
Do NOT touch the heat exchanger fins. These fins are sharp and could result in
cutting injuries.
WARNING
Be careful with ladders when working in high places.
Following symbols may occur on the indoor unit:
8 | Maintenance and service
SymbolExplanation
Measure the voltage at the terminals of main circuit capacitors or
electrical components before servicing.
8.2 To clean the indoor unit and user interface
WARNING
Improper detergents or cleaning procedure may cause damage on plastic
components or water leakage. Splashed detergent on electric components, such as
motors, may cause failure, smoke or ignition.
NOTICE
▪ Do NOT use gasoline, benzene, thinner, polishing powder or liquid insecticide.
Possible consequence: Discoloration and deformation.
▪ Do NOT use water or air of 40°C or higher. Possible consequence: Discoloration
and deformation.
▪ Do NOT use polishing compounds.
▪ Do NOT use a scrubbing brush. Possible consequence: The surface finishing peels
off.
▪ As an end user, you may NEVER clean inside parts of the unit by yourself; this
work must be performed by a qualified service person. Contact your dealer.
1Clean with a soft cloth. If it is difficult to remove stains, use water or a neutral
Before cleaning, be sure to stop the operation, turn the breaker off or pull out the
supply cord. Otherwise, an electric shock and injury may result.
detergent.
User reference guide
43
8 | Maintenance and service
a
8.3 To clean the front panel
1Clean the front panel with a soft cloth. If it is difficult to remove stains, use
8.4 To remove the front panel
1Hold the front panel by the panel tabs on both sides and open it.
water or a neutral detergent.
2Remove the front panel by sliding it to the left or the right and pulling it
toward you.
Result: The front panel shaft on 1 side will be disconnected.
3Disconnect the front panel shaft on the other side in the same manner.
8.5 About the air filters
Operating the unit with dirty filters means that the filter:
▪ CANNOT deodorise the air,
▪ CANNOT clean the air,
▪ poor heating/cooling,
▪ causes odour.
a Front panel shaft
8.6 To clean the air filters
User reference guide
44
1Push the tab at the centre of each air filter, then pull it down.
2Pull out the air filters.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
8 | Maintenance and service
2
1
Note: (class 50) The titanium apatite deodorising filter and the silver allergen
removal air purifying filter MUST be removed before cleaning the air filter.
3Remove the titanium apatite deodorising filter and the silver allergen removal
air purifying filter from all 4 claws.
a Claw
4Wash the air filters with water or clean them with a vacuum cleaner.
5Soak in lukewarm water for about 10 to 15 minutes.
INFORMATION
▪ If the dust does NOT come off easily, wash them with a neutral detergent diluted
in lukewarm water. Dry the air filters in the shade.
▪ It is recommended to clean the air filters every 2 weeks.
It is recommended to have periodical maintenance performed by a specialist. For
specialist maintenance, contact your dealer. Maintenance costs shall be borne by the
customer.
In certain operating conditions the inside of the unit may get dirty after several
seasons of use. This results in poor performance.
User reference guide
48
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
9 Troubleshooting
If one of the following malfunctions occur, take the measures shown below and
contact your dealer.
WARNING
Stop operation and shut off the power if anything unusual occurs (burning smells
etc.).
Leaving the unit running under such circumstances may cause breakage, electric
shock or fire. Contact your dealer.
The system MUST be repaired by a qualified service person.
9 | Troubleshooting
MalfunctionMeasure
If a safety device such as a fuse, a breaker or an
earth leakage breaker frequently actuates or the
Turn OFF the main power
switch.
ON/OFF switch does NOT properly work.
If water leaks from the unit.Stop the operation.
The operation switch does NOT work well.Turn OFF the power supply.
The operation lamp flashes and you can check
the error code by the user interface. To display
Notify your installer and report
the error code.
the error code see "9.2Solving problems based
on error codes"[452].
If the system does NOT operate properly except for the above mentioned cases
and none of the above mentioned malfunctions is evident, investigate the system
in accordance with the following procedures.
MalfunctionMeasure
If the system does NOT
operate at all.
▪ Check if there is no power failure. Wait until
power is restored. If a power failure occurs during
operation, the system automatically restarts
immediately after power is restored.
▪ Check if no fuse has blown or breaker is activated.
Change the fuse or reset the breaker if necessary.
▪ Check if the air inlet or outlet of the outdoor or
indoor unit is NOT blocked by obstacles. Remove
any obstacles and make sure the air can flow
freely.
▪ The air conditioner may stop operating after
sudden large voltage fluctuations to protect the
system. It automatically resumes operation after
about 3minutes.
If the set temperature is reached, the airflow rate is
reduced and operation stops. Operation will resume
automatically when the indoor temperature rises or
falls.
The indoor unit is adjusting the position of the flaps.
The flaps will start moving soon.
User reference guide
49
9 | Troubleshooting
MalfunctionMeasure
Operation does NOT start
soon.
The system operates, but
cooling or heating is
insufficient.
In case the ON/OFF button was pressed right after
operation was stopped or if the mode was changed.
Operation will start after 3minutes to protect the
system.
▪ Check the airflow rate setting. Refer to
"6.4Airflow rate"[423].
▪ Check the temperature setting. Refer to "6.3.1 To
start/stop operation mode and to set the
temperature"[422].
▪ Check if the airflow direction setting is
appropriate. Refer to "6.5Airflow direction"[423].
▪ Check if the air inlet or outlet of the outdoor or
indoor unit is NOT blocked by obstacles. Remove
any obstacles and make sure the air can flow
freely.
▪ Check if the air filters are clogged. Clean the air
filters. See "8Maintenance and service"[442].
▪ Check for open doors or windows. Close doors and
windows to prevent wind from coming in.
▪ Check if the unit operates in Econo or Outdoor
unit quiet operation. Refer to "6.8 Econo and
Outdoor unit quiet operation"[427].
The system operates, but
heating is insufficient (air is
NOT blown from the unit).
The ON/OFF timer does
NOT operate according to
the settings.
Cooling operation CANNOT
be selected.
An abnormal function
happens during operation.
The unit does NOT receive
signals from the user
interface.
▪ Check if there is any furniture directly under or
next to the indoor unit. Move the furniture.
▪ The air conditioner may be warming up for heating
operation. Wait for 1 to 4 minutes.
▪ If a flowing sound is heard, the outdoor unit may
be in defrost operation. Wait for 4 to 12 minutes.
▪ Check if the Weekly timer and ON/OFF timer are
set to the same time. Change or deactivate the
setting. Refer to "6.10OFF/ON timer
operation" [4 28] and "6.11 Weekly timer
operation"[430].
▪ Check if the clock and the day of the week are set
correctly. Refer to "5.4About the clock"[418].
Check if your system is NOT heating only version.
The air conditioner may malfunction because of
lightning or radio waves. Turn the breaker OFF and
back ON.
▪ Check the batteries of the user interface. Refer to
"5.2To insert the batteries"[417].
▪ Make sure that the transmitter is NOT exposed to
direct sunlight.
User reference guide
50
▪ Check if there are any electronic starter type
fluorescent lamps in the room. Contact your
dealer.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
9 | Troubleshooting
MalfunctionMeasure
The user interface display is
Replace the batteries of the user interface.
blank.
An error code can be
displayed on the user
interface.
Consult your local dealer. Refer to "9.2Solving
problems based on error codes"[452] to
procedure how to display the error code and for a
detailed list of error codes.
Other electric appliances
start to operate.
If the user interface signals operate other electric
appliances, move the other appliances away, and
contact your dealer.
If after checking all above items, it is impossible to fix the problem yourself, contact
your installer and state the symptoms, the complete model name of the unit (with
manufacturing number if possible) and the installation date (possibly listed on the
warranty card).
9.1 Symptoms that are NOT system malfunctions
The following symptoms are NOT system malfunctions:
9.1.1 Symptom: A sound like water flowing is heard
▪ This sound is caused by the refrigerant flowing in the unit.
▪ This sound may be generated when water is flowing away from the unit during
cooling or drying operation.
▪ The refrigerant flows in the air conditioner even if the indoor unit is turned off
and an indoor unit in another room is operating.
9.1.2 Symptom: A blowing sound is heard
This sound is generated when the direction of the refrigerant flow is changed (e.g.
when switching from cooling to heating).
9.1.3 Symptom: A ticking sound is heard
This sound is generated when the unit slightly expands or contracts with changes in
temperature.
9.1.4 Symptom: A whistling sound is heard
This sound is generated by the refrigerant flowing during defrost operation.
9.1.5 Symptom: A clicking sound during operation or idle time is heard
This sound is generated when the refrigerant control valves or electrical parts
operate.
9.1.7 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)
9.1.8 Symptom: The units can give off odours
9.1.9 Symptom: The outdoor fan rotates while the air conditioner is not in operation
This sound is generated when an external device sucks air out of the room (e.g.
exhaust fan, extractor hood) while the doors and windows in the room are closed.
Open the doors or windows, or turn off the device.
When the system is changed over to heating operation after defrost operation.
Moisture generated by defrost becomes steam and is exhausted.
The unit can absorb the smell of rooms, furniture, cigarettes, etc., and then emit it
again.
▪ After operation has stopped. The outdoor fan continues to rotate for another
30 seconds for system protection.
▪ While the air conditioner is not in operation. When the outdoor temperature is
very high, the outdoor fan starts to rotate for system protection.
9.1.10 Symptom: Indoor unit fan speed does not correspond with the setpoint (during low
ambient cooling operation in Multi system)
▪ During low ambient cooling operation in Multi system, indoor unit may change
fan speed to high regardless of the user setting to defrost the indoor unit heat
exchanger.
9.2 Solving problems based on error codes
Fault diagnosis by user interface
If the unit runs into a problem, you can identify the fault by checking the error
code by the user interface. It is important to understand the problem and take
measures before resetting the error code. This should be done by a licensed
installer or your local dealer.
INFORMATION
See the service manual for:
▪ The complete list of error codes
▪ A more detailed troubleshooting guideline for each error
User reference guide
52
To check the error code by the user interface
1Aim the user interface at the unit and press for about 5seconds.
Result: blinks in the temperature setting display section.
2Aim the user interface at the unit and press repeatedly until a
continuous beep is heard.
Result: The code is now displayed on the display.
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
INFORMATION
▪ A short beep and 2 consecutive beeps indicate non-corresponding codes.
▪ To cancel the code display, hold for 5 seconds. The code will also
disappear from the display if the button is NOT pressed within 1minute.
System
Error codeDescription
Normal
Refrigerant shortage
Overvoltage detection
Malfunction of transmission
Signal transmission error (between indoor and outdoor unit)
The following table provides a brief description of how to deal with some
problems. If none of the following solutions fix the problem, go to http://
www.onlinecontroller.daikineurope.com/ for more information and FAQ.
ProblemMeasure
Connection to the wireless LAN is not
possible (none of the LEDs on the
indoor unit display are blinking).
The wireless LAN is NOT visible on the
unit overview screen (Home screen)
after configuration of the WLAN
adapter (WPS option).
The wireless LAN is NOT visible in the
available Wi-Fi networks list on the
smart device (Access point option).
▪ Try operating the unit with the user
interface.
▪ Check if the power is on.
▪ Turn the unit off and back on again.
▪ Make sure the wireless LAN is close
enough to the communication device.
▪ Check if communication is OK.
▪ Make sure that the smart device is
connected to the same wireless
network as the wireless LAN.
▪ Try resetting to the factory default
and repeat the setting. See "To reset
the connection setting to the factory
default"[437].
▪ Try switching between access point
and WPS setting to change the
wireless channel. The wireless
channel MUST be between 1~13.
▪ Check if communication is OK.
▪ Try resetting to the factory default
and repeat the setting. See "To reset
the connection setting to the factory
default"[437].
Displayed indoor/outdoor temperature
value in Daikin Residential Controller
differs from the value measured by
other appliances.
▪ Daikin Residential Controller displays
indoor/outdoor temperature only for
the indoor/outdoor unit's
surrounding.
▪ Measured temperature for other
appliances may differ due to different
condition around the unit (e.g. direct
sunlight, frost accumulation…)
▪ Temperature displayed in Daikin
Residential Controller is only
referential.
User reference guide
54
ATXM20~35R2V1B + ATXM50R2V1B + ATXM20~35R5V1B
Daikin room air conditioner
4P518786-6F – 2020.06
10 Disposal
10 | Disposal
NOTICE
Do NOT try to dismantle the system yourself: dismantling of the system, treatment of
the refrigerant, oil and other parts MUST comply with applicable legislation. Units
MUST be treated at a specialised treatment facility for reuse, recycling and recovery.
Technical skilled person who is qualified to install the product.
User
Person who is owner of the product and/or operates the product.
Applicable legislation
All international, European, national and local directives, laws, regulations
and/or codes that are relevant and applicable for a certain product or
domain.
Service company
Qualified company which can perform or coordinate the required service to
the product.
Installation manual
Instruction manual specified for a certain product or application, explaining
how to install, configure and maintain it.
Operation manual
Instruction manual specified for a certain product or application, explaining
how to operate it.
Accessories
Labels, manuals, information sheets and equipment that are delivered with
the product and that need to be installed according to the instructions in
the accompanying documentation.
Optional equipment
Equipment made or approved by Daikin that can be combined with the
product according to the instructions in the accompanying documentation.
Field supply
Equipment NOT made by Daikin that can be combined with the product
according to the instructions in the accompanying documentation.