Toyotomi UTN-17AP User manual

Οδηγίες Χρήσης
User’s Manual
Manuale d’installazione ed uso
ΚΛΙΜΑΤΙΣΤΙΚΟ TOIXOY DC INVERTER
WALL MOUNTED AIR CONDITIONER INVERTER TYPE
CONDIZIONATORE SPLIT
ΜΟΝΤΕΛΑ / MODELS / MODELLI
UTN/UTG-17AP
UTN/UTG-21AP
Ευχαριστούμε για την επιλογή σας στα κλιματιστικά οικιακής χρήσης TOYOTOMI.
Πριν χρησιμοποιήσετε αυτή τη συσκευή, παρακαλούμε διαβάστε προσεκτικά αυτό το
εγχειρίδιο χρήσεως. Κρατήστε αυτό το εγχειρίδιο χρήσεως για μελλοντική αναφορά σε αυτό.
Thank you for your choice in TOYOTOMI Wall Mounted Air Conditioners.
Before using this product, be sure to read this Instruction Manual carefully to ensure proper
usage. Keep this manual in good shape for future reference.
Grazie per aver scelto un prodotto TOYOTOMI.
Per un corretto funzionamento, leggere attentamente questo manuale prima di usare il
condizionatore e conservarlo per una futura consultazione.

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CONTENTS
THE REFRIGERANT............................................................................. 65-66
PRECAUTIONS..................................................................................... 67-71
PARTS NAME ....................................................................................... 71-72
BUTTONS ON THE REMOTE CONTROLLER .................................... 73-74
INTRODUCTION FOR BUTTONS OF REMOTE CONTROLLER ........ 75-83
REPLACEMENT OF BATERIES IN REMOTE CONTROLLER ..................83
EMERGENCY OPERATION ................................................................ 83-84
CLEAN AND MAINTENANCE .............................................................. 84-86
TROUBLE – CAUSE – SOLUTION....................................................... 86-88
INSTALLATION DIMENSION DIAGRAM .............................................. 90-91
SAFETY PRECAUTION ..............................................................................93
GROUNDING REQUIREMENT...................................................................94
INSTALLATION OF INDOOR UNIT..................................................... 94-100
INSTALLATION OF OUTDOOR UNIT............................................... 100-104
VACUUM PUMPING .................................................................................104
OPERATION TEST....................................................................................105
LEAKAGE DETECTION ............................................................................106
CONFIGURATION OF CONNECTION PIPE .................................... 106-107
SAFETY OPERATION OF FLAMMABLE REFRIGERANT .......................108
INSTALLATION NOTES .................................................................... 108-109
MAINTENANCE NOTES ....................................................................109-110
CHECK AFTER INSTALLATION ........................................................ 110-112
SPECIALIST’S MANUAL.................................................................... 112-114

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DANGER: This symbol indicates a dangerous situation that if not
avoided could lead to death or serious injury.
WARNING: This symbol indicates a dangerous situation that if not
avoided could lead to death or serious injury.
ATTENTION: This symbol indicates a dangerous situation that if not
avoided could lead to minor or moderate damage.
NOTICE: Indicates important information indicate the risk of material damage.
EXCEPTION CLAUSES
Manufacturer will bear no responsibilities when personal injury or property loss
is caused by the following reasons.
Damage the product due to improper use or misuse of the product.
Alter, change, maintain or use the product with other equipment without abiding
by the instruction manual of manufacturer.
After verification, the defect of product is directly caused by corrosive gas.
After verification, the defects are due to improper operation during transportation
of product.
Operate, repair, maintain the unit without abiding by instruction manual or
related regulations.
After verification, the problem or dispute is caused by the quality specification or
performance of parts and components that produced by other manufacturers.
The damage is caused by natural calamities, bad using environment or force
majeure.
THE REFRIGERANT
Appliance filled with flammable gas R32.
Before use the appliance, read the owner’s manual first.
Before install the appliance, read the installation manual first.
Before repair the appliance, read the service manual first.

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Refrigerant R32: GWP 675
§To realize the function of the air conditioner unit, a special refrigerant
circulates in the system. The used refrigerant is the fluoride R32, which is
specially cleaned. The refrigerant is flammable and inodorous. Furthermore,
it can lead to explosion under certain conditions. But the flammability of the
refrigerant is very low. It can be ignited only by fire.
§Compared to common refrigerants, R32 is a nonpolluting refrigerant with no
harm to the ozonosphere. The influence upon the reenhouse effect is also
lower. R32 has got very good thermodynamic features which lead to high
energy efficiency. The units therefore need a less filling.
WARNING:
§DO NOT use means to accelerate the defrosting process or
to clean, other than those recommended by the manufacture.
Should repair be necessary, contact your nearest authorized
Service Center. Any repairs carried out by unqualified personnel
may be dangerous. The appliance shall be stored in a room
without continuously operating ignition sources. (for example:
open flames, an operating gas appliance or an operating
electric heater.) DO NOT pierce or burn.
§Appliance shall be installed, operated and stored in a room with
a floor area larger than 4m2.
§Appliance filled with flammable gas R32. For repairs, strictly
follow manufacturer’s instructions only. Be aware that
refrigerants not contain odor. Read specialist’s manual.
1. Frequency band(s) in which the radio equipment operates:
2400MHz-2483.5MHz
2. Maximum radio-frequency power transmitted in the frequency
band(s) in which the radio equipment operates: 20dBm

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PRECAUTIONS
WARNING
Operation and Maintenance
qThis appliance can be used by children aged from 8 years and
above and persons 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
appliance in a safe way and understand the hazards involved.
qChildren shall not play with the appliance.
qCleaning and user maintenance shall not be made by children
without supervision.
qDO NOT connect air conditioner to multi-purpose socket.
Otherwise, it may cause fire hazard.
qAlways disconnect power supply when cleaning air conditioner.
Otherwise, it may cause electric shock.
qIf the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualified persons to
avoid a hazard.
qDO NOT wash the air conditioner with water to avoid electric
shock.
qDO NOT spray water on indoor unit. It may cause electric shock
or malfunction.
qAfter removing the filter, do not touch fins to avoid injury.
qDO NOT use fire or hair dryer to dry the filter to avoid deformation
or fire hazard.
qCleaning or maintenance MUST NOT be made by children.
Supervision must always be provided by an adult responsible
for their safety.
qMaintenance must be performed by qualified professionals.
Otherwise, it may cause personal injury or damage. In such
case warranty will be invalid.
qDO NOT repair air conditioner by yourself. It may cause electric

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shock or damage. Please contact your dealer when you need
to repair air conditioner.
qDO NOT insert fingers or objects into air inlet or air outlet. It
may cause personal injury or damage.
qDO NOT block air outlet or air inlet. It may cause malfunction.
qDO NOT spill water on the remote controller, otherwise the
remote controller may be broken.
qWhen below phenomenon occurs, please turn off air conditioner
and disconnect power immediately and then contact the dealer
or qualified professionals for service.
- Power cord is overheating or damaged.
- There is abnormal sound during operation.
- Circuit break trips off frequently.
- Air conditioner gives off burning smell.
- There is a leakage from the indoor unit.
qIf the air conditioner operates under abnormal conditions, it
may cause malfunction electric shock or fire hazard.
qWhen turning on or turning off the unit by emergency operation
switch, please press this switch with an insulating object other
than metal.
qDO NOT step on top panel of outdoor unit, or put heavy objects.
It may cause damage or personal injury.
qInstallation must be performed by qualified professionals.
Otherwise, it may cause personal injury or damage.
qMust follow the electric safety regulations when installing the
unit.
qAccording to the local safety regulations, use qualified power
supply circuit and circuit break.
qInstall the circuit break. If not, it may cause malfunction.
qAn all-pole disconnection switch having a contact separation of
at least 3 mm in all poles should be connected in fixed wiring.
qIncluding an circuit break with suitable capacity, please note the
following table. Air switch should be included magnet buckle

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and heating buckle function, it can protect the circuit-short and
overload.
qAir Conditioner should be properly grounded. Incorrect
grounding may cause electric shock.
qDO NOT use unqualified power cord.
qMake sure the power supply matches with the requirement of
air conditioner. Unstable power supply or incorrect wiring may
result in electric shock, fire hazard or malfunction. Please install
proper power supply cables before using the air conditioner.
qProperly connect the live wire, neutral wire and grounding wire
of power socket.
qBe sure to cut off the power supply before proceeding any work
related to electricity and safety.
qDO NOT put through the power before finishing installation.
qIf the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualified persons to
avoid a hazard.
qThe temperature of refrigerant circuit will be high, please keep
the interconnection cable away from the copper tube.
qThe appliance shall be installed in accordance with national
wiring regulations.
qInstallation must be performed in accordance with the
equirement of NEC and CEC by authorized personnel only.
qThe air conditioner is the first class electric appliance. It must
be properly grounding with specialized grounding device by a
professional. Please make sure it is always grounded effectively,
otherwise it may cause electric shock.
qThe yellow-green wire in air conditioner is grounding wire,
which cannot be used for other purposes.
qThe grounding resistance should comply with national electric
safety regulations.
qThe appliance must be positioned so that the plug is accessible.
qAll wires of indoor unit and outdoor unit should be connected by

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a professional.
qIf the length of power connection wire is insufficient please
contact the supplier for a new one. Avoid extending the wire by
yourself.
qFor the air conditioner with plug the plug should be reachable
after finishing installation.
qFor the air conditioner without plug, an circuit break must be
installed in the line.
qIf you need to relocate the air conditioner to another place, only
the qualified person can perform the work. Otherwise, it may
cause personal injury or damage.
qSelect a location which is out of reach for children and far away
from animals or plants. If it is unavoidable, please add the fence
for safety purpose.
qThe indoor unit should be installed close to the wall.
qInstructions for installation and use of this product are provided
by the manufacturer.
qThe air conditioner is not allowed to use in a room that has
running fire (such as fire source, working coal gas ware,
operating heater).
qIt is not allowed to drill hole or burn the connection pipe. These
tasks shall only be done by a licensed technician to ensure
your safety.
qThe air conditioner must be installed in a room that is larger than
the minimum room area. The minimum room area is shown on
the nameplate or following table a (page 108).
qLeak test is a must after installation.

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Working temperature range
Indoor Side DB/WB
(ºC)
Outdoor Side DB/WB
(ºC)
Maximum Cooling 32/23 43/26
Maximum Heating 27/- 24/18
NOTICE:
The operating temperature range (outdoor temperature) for heat pump unit is
-15 ºC ~ 43 ºC.
PARTS NAME
DISPLAY
Temp. indicator
Power indicator
Notice:
Actual product may be different from above graphics. Please refer
to actual product.
Air inlet
Panel
Filter
aux button
Horizontal louver
Air outlet

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OUTDOOR UNIT
Air inlet
Air outlet

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BUTTONS ON THE REMOTE CONTROLLER
1 ON/OFF button
2 MODE button
3 FAN button
4 TURBO button
5 c/dbuttons
6 button
7 button
8 SLEEP button
9 I SENSE button
10 TIMER ON / TIMER OFF buttons
11 CLOCK button
12 QUIET button (not available)
13 WIFI button
14 LIGHT button
15 / button
16 TEMP button

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I SENSE
Fan Function
Set fan speed
TURBO Function
Send signal
AUTO mode
COOL mode
FAN mode
HEAT mode
Sleep Function
LIGHT Function
Left and right swing
Up and down swing
Lock
Clock
Temperature display type
Self-Clean Function
Quiet Function (not available)
Auto Function
8ºC Function
Ionizer
Scavenging – Fresh Air (not available)
Temperature in Fahrenheit
WiFi Function
Temperature in Celsius
Set Time
Temperature display type
Set temperature
Indoor ambient temperature
Outdoor ambient temperature
(not availabble)

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INTRODUCTION FOR ICONS ON DISPLAY SCREEN
Note:
qThis is a general use remote controller, it could be used for the air
conditioners with multifunction; For some function, which the model does
not have, if press the corresponding button on the remote controller that
the unit will keep the original running status.
qAfter putting through the power, the air conditioner will give out a sound.
Operation indictor is ON. After that, you can operate the air conditioner
by using remote controller.
qUnder on status, pressing the button on the remote controller, the signal
icon on the display of remote controller will blink once and the air
conditioner will give out a “de” sound, which means the signal has been
sent to the air conditioner.
1 ON/OFF button
Press this button to turn on the unit. Press this button again to turn off the unit.
2 MODE button
Press this button to select your required operation mode.
●When selecting auto mode, air conditioner will operate automatically
according to the sensed temperature. Set temperature cannot be adjusted
and will not be displayed as well. Press «FAN» button can adjust fan speed.
Press / button can adjust fan blowing angle.
●After selecting cool mode, air conditioner will operate under cool mode.
Cool indicator on indoor unit is ON (This indicator is not available for
some models). Press cordbutton to adjust set temperature. Press «FAN»
button to adjust fan speed. Press / button to adjust fan blowing angle.
●When selecting dry mode, the air conditioner operates at low speed
under dry mode. Dry indicator on indoor unit is ON (This indicator is
not available for some models). Under dry mode, fan speed cannot be
adjusted. Press / button to adjust fan blowing angle.
●When selecting fan mode, the air conditioner will only blow fan, no cooling
and no heating. All indicators are OFF, Operation indicator is ON. Press

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«FAN» button to adjust fan speed. Press / button to adjust fan blowing
angle.
●When selecting heating mode, the air conditioner operates under heat
mode. Heat indicator on indoor unit is ON (This indicator is not available
for some models). Press cordbutton to adjust set temperature. Press
«FAN» button to adjust fan speed. Press / button to adjust fan blowing
angle. (Cooling only unit will not receive heating mode signal. If setting heat
mode with remote controller, press ON/OFF button cannot start up the unit).
Note:
●For preventing cold air, after starting up heating mode, indoor unit will delay
1~5 minutes to blow air (actual delay time is depend on indoor ambient
temperature).
●Set temperature range from remote controller: 16~30℃(61-86°F); Fan
speed: auto, low speed, low-medium speed, medium speed, medium-high
speed, high speed.
3 FAN button
Pressing this button can set fan speed circularly as: auto (AUTO), low,
medium, high.
Note:
●Under AUTO speed, air conditioner will select proper fan speed
automatically according to ex-factory setting.
●It is Low fan speed under Dry mode.
●X-FAN function Hold fan speed button for 2 seconds in COOL or DRY
mode, the icon
is displayed and the indoor fan will continue operation
for a few minutes in order to dry the indoor unit even though you have
turned off the unit. After energization, X-FAN OFF is defaulted. X-FAN is
not available in AUTO, FAN or HEAT mode.
This function indicates that moisture on evaporator of indoor unit will be
blowed after the unit is stopped to avoid mould.
4 TURBO button
Under COOL or HEAT mode, press this button to turn to quick COOL or quick
HEAT mode. icon is displayed on remote controller. Press this button again
to exit turbo function and icon will disappear. If start this function, the unit
will run at super-high fan speed to cool or heat quickly so that the ambient

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temp. approaches the preset temp. as soon as possible.
5 c/dbutton
●Press cor dbutton once increase or decrease set temperature 1℃
(°F). Holding cor dbutton, 2 seconds later, set temperature on remote
controller will change quickly. On releasing button after setting is finished,
temperature indicator on indoor unit will change accordingly. (The
temperature cannot be adjusted in AUTO mode.)
●When setting TIMER ON, TIMER OFF or CLOCK, press cor dbutton
to adjust time. (Refer to CLOCK, TIMER ON, TIMER OFF buttons.) When
setting TIMER ON, TIMER OFF or CLOCK, press cor dbutton to adjust
time. (Refer to CLOCK, TIMER ON, TIMER OFF buttons.)
6 button
Press this button can select left and right swing angle. Fan blow angle can be
selected circularly as below:
Note:
●Press this button continuously more than 2 seconds, the main unit will swing
back and forth from left to right, and then loosen the button, the unit will stop
swinging and present position of guide louver will be kept immediately.
●Under swing left and right mode, when the status is switched from off to
, if press this button again 2 seconds later status will switch to off
status directly; if press this button again within 2 seconds, the change of
swing status will also depend on the circulation sequence stated above.
7 button
●Press this button can select up and down swing angle. Fan blow angle can
be selected circularly as below:
●When selecting , air conditioner is blowing fan automatically. Horizontal
louver will automatically swing up and down at maximum angle.
●When selecting , air conditioner is blowing fan at fixed
no display
no display

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position. Horizontal louver will stop at the fixed position.
●When selecting air conditioner is blowing fan at fixed angle.
Horizontal louver will send air at the fixed angle.
●Hold button above 2 seconds to set your required swing angle. When
reaching your required angle, release the button.
Note:
• may not be available. When air conditioner receives this signal,
the air conditioner will blow fan automatically.
• Press this button continuously more than 2 seconds, the main unit will
swing back and forth from up to down, and then loosen the button. The
unit will stop swinging and present position of guide lover will be kept
immediately.
• Under swing up and down mode, when the status is switched from off to
, if press this button again 2 seconds later, status will switch to off status
directly. If press this button again within 2 seconds, the change of swing
status will also depend on the circulation sequence stated above.
8 SLEEP button
Under COOL or HEAT mode, press this button to start up sleep function.
icon is displayed on remote controller. Press this button again to cancel sleep
function and icon will disappear. After powered on, Sleep Off is defaulted.
After the unit is turned off, Sleep function is canceled. Under FAN, DRY and
AUTO modes, this function is not available.
9 I SENSE button
Press this button to start I SENSE function and will be displayed on the
remote controller. After this function is set, the remote controller will send
the detected ambient temperature according to the controller and the unit
will automatically adjust the indoor temperature according to the detected
temperature. Press this button again to cancel I SENSE function and will
disappear.
USEFUL TIP
Please put the remote controller near user when this function is set. Do not put
the remote controller near the object of high temperature or low temperature
in order to avoid detecting inaccurate ambient temperature. When I SENSE
function is turned on, the remote controller should be put within the area where
indoor unit can receive the signal sent by the remote controller.

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10 TIMER ON / TIMER OFF button
TIMER ON button
“TIMER ON” button can set the time for timer on. After pressing this button,
icon disappears and the word “ON” on remote controller blinks. Press
κbutton to adjust TIMER ON setting. After each pressing cor dbutton,
TIMER ON setting will increase or decrease 1 minute. Hold cor dbutton, 2
seconds later, the time will change quickly until reaching your required time.
Press “TIMER ON” to confirm it. The word “ON” will stop blinking. icon
resumes displaying. Cancel TIMER ON: Under the condition that TIMER ON
is started up, press “TIMER ON” button to cancel it.
TIMER OFF button
“TIMER OFF” button can set the time for timer on. After pressing this button,
icon disappears and the word “OFF” on remote controller blinks. Press c
or dbutton to adjust TIMER OFF setting. After each pressing cor dbutton,
TIMER OFF setting will increase or decrease 1 minute. Hold cor dbutton,
2 seconds later, the time will change quickly until reaching your required time.
Press “TIMER OFF” to confirm it. The word “OFF” will stop blinking. icon
resumes displaying. Cancel TIMER OFF: Under the condition that TIMER OFF
is started up, press “TIMER OFF” button to cancel it.
Note:
• Under on and off status, you set TIMER OFF or TIMER ON simultaneously.
• Before setting TIMER ON or TIMER OFF, please adjust the clock time
properly.
11 CLOCK button
Press this button to set clock time. icon on remote controller will blink.
Press cor dbutton within 5 seconds to set clock time. Each pressing of cor
dbutton, 2 seconds later, time will change quickly. Release this button when
reaching your required time. Press “CLOCK” button to confirm the time. icon
stops blinking.
Note:
• Clock time adopts 24-hour mode.
• The interval between two operation cannot exceed 5 seconds. Otherwise,
remote controller will quite setting status. Operation for TIMER ON/ TIMER
OFF is the same.
12 QUITE button (not available)
Press this button, the Quiet status is under the Auto Quiet mode and displays
and “AUTO” signal. Quiet mode displays signal and during Quiet OFF

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there is no signal displayed. After powered on, the Quiet OFF is defaulted.
Note:
• The Quite function is only available for some models.
13 WIFI button
Press “WiFi” button to turn on or off WiFi function. When WiFi function is turned
on, “WiFi” icon will be displayed on remote controller. Under status of unit off,
press “MODE” and “WiFi” buttons simultaneously for 1 second. WiFi module
will restore to factory default setting.
14 LIGHT button
Press this button to turn off display light on indoor unit. icon on remote
controller disappears. Press this button again to turn on display light. icon
is displayed.
15 button
Press this button to achieve the on and off Ionizer and scavenging (fresh air –
not available) functions in operation status. Press this button for the first time
to start scavenging function. LCD displays . Press the button for the second
time to start Ionizer and scavenging functions simultaneously. LCD displays
and . Press this button for the third time to quit Ionizer and Scavenging
functions simultaneously. Press the button for the fourth time to start Ionizer
function. LCD displays . Press this button again to repeat the operation
above.
16 TEMP button
By pressing this button, you can see indoor set temperature, indoor ambient
temperature or outdoor ambient temperature (not available) on indoor unit’s
display. The setting on remote controller is selected circularly as below:
• When selecting or no display with remote controller, temperature
indicator on indoor unit displays set temperature.
• When selecting
with remote controller, temperature indicator on indoor
unit displays indoor ambient temperature.
• When selecting with remote controller, temperature indicator on indoor
unit displays outdoor ambient temperature. (not available)
no display

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Note:
• Outdoor temperature display is not available. At that time, indoor unit
receives signal, while it displays indoor set temperature.
• It is defaulted to display set temperature when turning on the unit. There is
no display in the remote controller.
• When selecting displaying of indoor or outdoor ambient temperature,
indoor temperature indicator displays corresponding temperature and
automatically turn to display set temperature after three of five seconds.
FUNCTION INTRODUCTION FOR COMBINANTION BUTTONS
ENERGY-SAVING FUNCTION
Under cooling mode, press “TEMP” and “CLOCK” buttons simultaneously to
start up or turn off energy-saving function. When energy-saving function is
started up, “SE” will be shown on remote controller and air conditioner will
adjust the set temperature automatically according to ex-factory setting to
reach to the best energy-saving effect. Press “TEMP” and “CLOCK” buttons
simultaneously again to exit energy-saving function.
Note:
• Under energy-saving function, fan speed is defaulted at auto speed and it
cannot be adjusted.
• Under energy-saving function, set temperature cannot be adjusted. Press
“TURBO” button and remote controller will not send signal.
• Sleep function and energy-saving function cannot operate at the same
time. If energy-saving function has been set under cooling mode, press
sleep button to cancel energy-saving function. If sleep function has been
set under cooling mode, start up the energy-saving function to cancel sleep
function.
8 ºC HEATING FUNCTION
Under heating mode, press “TEMP” and “CLOCK” buttons simultaneously to
start up or turn off 8 ºC heating function. When this function is started up, and
“8 ºC” will be shown on remote controller. The air conditioner keeps the heating
status at 8 ºC. Press again “TEMP” and “CLOCK” buttons simultaneously, to
cancel this function.
Note:

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• Under 8 ºC heating function, fan speed is defaulted at auto speed and it
cannot be adjusted.
• Under 8 ºC heating function, set temperature cannot be adjusted. Press
“TURBO” button and the remote controller will not send signal.
• Sleep function and 8 ºC heating function cannot operate at the same time.
If 8 ºC heating function has been set under heating mode, press sleep
button to cancel 8 ºC heating function. If sleep function has been set under
heating mode, start up the 8 ºC heating function to cancel sleep function.
• Under ºF temperature display, the remote controller will display 46°F
heating.
CHILD LOCK FUNCTION
Press cand dsimultaneously to turn on or turn off child lock function. When
child lock function is on, icon is displayed on remote controller. If you operate
the remote controller, icon will blink three times without sending signal to
the unit.
AUTO CLEAN FUNCTION
Under unit off status, hold “MODE” and “FAN” buttons simultaneously for 5
seconds to turn on or off the AUTO CLEAN function. When the AUTO CLEAN
function is turned on, indoor displays “CL”. During the auto clean process of
evaporator, the unit will perform fast cooling or fast heating. There may be
some noise, which is the sound of flowing liquid or thermal expansion or cold
shrinkage. The air conditioner may blow cold or warm air, which is a normal
phenomenon. During cleaning process, please make sure the room is well
ventilated to avoid affecting the comfort.
Note:
• The AUTO CLEAN function can only work under normal ambient
temperature. If the room is dusty, clean it once a month. If not, clean it
once every three months. After the auto clean function is turned on, you
can leave the room. When auto clean is finished, the air conditioner will
enter standby status.
TEMPERATURE DISPLAY SWITCHOVER FUNCTION
Under OFF status, press dand “MODE” buttons simultaneously to switch
temperature display between ºC and ºF.