Haier HSU-09LEB13-H - annexe 1 User manual

Please read this operation manual before using the air conditioner.
SPLIT TYPE ROOM AIR CONDITIONER
OPERATION MANUAL
0010515267
HSU-09LEB13-H
HSU-12LEB13-H
HSU-14LEB13-H

Before disposing an old air conditioner that
goes out of use, please make sure it's inop-
erative and safe. Unplug the air conditioner
in order to avoid the risk of child entrapment.
It must be noticed that air conditioner system
contains refrigerants, which require speciali-
zed waste disposal. The valuable materials
contained in an air conditioner can be recycled
.Contact your local waste disposal center for
proper disposal of an old air conditioner and
contact your local authority or your dealer if
you have any question. Please ensure that
the pipework of your air conditioner does not
get damagedprior to being picked up by the
relevant waste disposal center, and contribute
to environmental awareness by insisting on an
appropriate, anti-pollution method of disposal.
Cautions
Disposal of the old air conditioner
All the packaging materials employed in the
package of your new air conditioner may be
disposed without any danger to the
environment.
The cardboard box may be broken or cut into
smaller pieces and given to a waste paper
disposal service. The wrapping bag made of
polyethylene and the polyethylene foam pads
contain no fluorochloric hydrocarbon.
All these valuable materials may be taken to
a waste collecting center and used again after
adequate recycling.
Consult your local authorities for the name
and address of the waste materials collecting
centers and waste paper disposal services
nearest to your house.
Disposal of the packaging of your
new air conditioner
Before starting the air conditioner, read the
information given in the User's Guide caref-
ully. The User's Guide contains very impor-
tant observations relating to the assembly,
operation and maintenance of the air
conditioner.
The manufacturer does not accept respon-
sibility for any damages that may arise due
to non-observation of the following
instruction.
Damaged air conditioners are not to be
put into operation. In case of doubt, consult
your supplier.
Use of the air conditioner is to be carried
out in strict compliance with the relative
instructions set forth in the User's Guide.
Installation shall be done by professional
people, don't install unit by yourself.
For the purpose of the safety,the air con-
ditioner must be properly grounded in acco-
rdance with specifications.
Always remember to unplug the air
conditioner before openning inlet grill. Never
unplug your air conditioner by pulling on
the power cord. Always grip plug firmly and
pull straight out from the outlet.
All electrical repairs must be carried out
by qualified electricians. Inadequate repairs
may result in a major source of danger for
the user of the air conditioner.
Safety Instructions and Warnings
Do not damage any parts of the air
conditioner that carry refrigerant by piercing
or performating the air conditioner's tubes
with sharp or pointed items, crushing or
twisting any tubes, or scraping the coatings
off the surfaces. If the refrigerant spurts
out and gets into eyes, it may result in
serious eye injuries.
1

3. If the fuse of indoor unit on PC board is
broken,please change it with the type of
T. 3.15A/ 250V.
Do not obstruct or cover the ventilation
grille of the air conditoner.Do not put fingers
or any other things into the inlet/outlet and
swing louver.
Do not allow children to play with the air
conditioner.In no case should children be
allowed to sit on the outdoor unit.
The refrigerating circuit is leak-proof.
1.Applicable ambient temperature range:
Cooling
Indoor
Maximum:D.B/W.B 32oC/23oC
43oC/26oC
18oC/14oC
Maximum:D.B/W.B
Minimum:
Minimum:D.B/W.B
Outdoor
Specifications
The machine is adaptive in following
situation
10 .The power plug and connecting cable
must have acquired the local attestation.
2. If the power supply cord is damaged, it
must be replaced by the manufacturer
or its service agent or a similar qualified
person.
4. The wiring method should be in line with
the local wiring standard.
5. After installation, the power plug should
be easily reached.
6. The waste battery should be disposed
properly.
7. The appliance is not intended for use
by young children or infirm persons
without supervision.
8. Young children should be supervised
to ensure that they do not play with
the applience.
9.Please employ the proper power plug,
which fit into the power supply cord.
Cautions
2
11.In order to protect the units,please turn
off the A/C first, and at least 30 seconds
later, cutting off the power.
D.B 18oC

Cautions
STRICT
ENFORCEMENT
Safety Instruction
Installation
WARNING
Please read the following Safety Instructions carefully prior to use.
The instructions are classified into two levels, WARNING and CAUTION according to
the seriousness of possible risks and damages as follows. Compliance to the
instructions are strictly required for safety use.
Please call Sales/Service Shop for the Installation.
Do not attempt to install the air conditioner by yourself because improper works
may cause electric shock, fire, water leakage.
lnstallation in a inadequate place may cause accidents. Do not install in the following place.
Connect the earth
cable.
earthing
Do not install in the
place where there is
any possibility of
inflammable gas
leakage around the
unit.
Do not get the unit
exposed to vapor
or oil steam.
Check proper
installation of the
drainage securely
PROHIBITION PROHIBITION
3
CAUTION

Cautions
WARNING
When abnormality such as burnt-small found,
immediately stop the operation button and
contact sales shop.
OFF
Use an exclusive power source with a
circuit breaker
ENFORCEMENT
Connect power supply cord
to the outlet completely Use the proper voltage
Do not use power supply cord
in a bundle.
Take care not to damage
the power supply cord.
Do not use power supply cord
extended or connected in halfway
STRICT
ENFORCEMENT
STRICT
STRICT
ENFORCEMENT PROHIBITION
PROHIBITION PROHIBITION
PROHIBITION
Do not start or stop the
operation by disconnecting
the power supply cord and so on.
Do not channel the air flow directly
at people, especially at infants or
the aged.
Do not try to repair or reconstruct
by yourself.
Do not use for the purpose of storage of
food, art work, precise equipment,
breeding, or cultivation.
CAUTION
Take fresh air occasionally especially
when gas appliance is running at the
same time.
PROHIBITION
STRICT
ENFORCEMENT
Do not operate the switch with
wet hand.
PROHIBITION
PROHIBITION
4
PROHIBITION PROHIBITION
PROHIBITION
Do not install the unit near a fireplace
or other heating apparatus. Check good condition of the
installation stand
Do not pour water onto the unit
for cleaning
PROHIBITION
Do not place animals or plants in
the direct path of the air flow Do not place any objects on or
climb on the unit.
Do not place flower vase or water
containers on the top of the unit.
Do not insert objects into the air
inlet or outlet.
PROHIBITION
PROHIBITION
PROHIBITION

5
Parts and Functions
Indoor Unit
OUTLET
INLET
CONNECTING PIPING AND ELECTRICAL WIRING
DRAIN HOSE
Outdoor Unit
HSU-12LEB13-HHSU-09LEB13-H
HSU-14LEB13-H
Actual inlet grille may vary from the one shown in the manual according to
the product purchased
Display board
Inlet
Air Purifying Filter
Horizontal flap
(adjust up and down air flow.
Don't adjust it manually)
Air filter(inside)
Inlet grille Power plug
(inside)
Outlet
(adjust left and right air flow)
Vertical blade

6
Parts and Functions
ON/OFF TEMP
MODE SET
FAN TIMER
SWING CLOCK
SLEEP
LOCK RESET
5
6
7
8
9
10
19
20
21
22
23
1
2
3
11
12
13
14
15
16
A
U
T
O
ON OFF
AM
PM
o
C
17
18
1. Operation mode display
2. SWING display
3. FAN SPEED display LO MED HIAUTO
5. SLEEP display
6. LOCK display
7. SIGNAL SENDING display
8. TIMER OFF display
9. TIMER ON display
10. CLOCK display
11. TEMP display
12. POWER ON/OFF
Used for unit start and stop.
13. MODE
Used to select AUTO run, COOL, DRY and FAN operation
15. HOUR
Used to set clock and timer setting.
16. SWING
Used to set auto fan direction.
17. SLEEP
Used to select sleep mode.
18. LOCK
Used to lock buttons and LCD display.
19. TEMP.
Used to select your desired temp.
20. SET
Used to confirm timer and clock settings.
21. TIMER
Used to select TIMER ON, TIMER OFF,
TIMER ON-OFF
22. CLOCK
Used to set correct time
23. RESET
normal condition.
Used to reset the controller back to
Hints: After replacing with new batteries, remote controller will conduct self-check, displaying
all information on LCD. Then, it will become normal.
Display board
24
24.
Singal receiver hole
25. Ambient temp.display
When receiving the remote control signal, display the set
temperature and in the rest time the room temperature is
displayed and this room temperature is only for reference.
25
14. FAN
Used to select fan speed LO, MED, HI, AUTO
189
1
Remote controller
Clock set
When unit is started for the first time and after replacing batteries in remote controller,
clock should be adjusted as follows:
Press CLOCK button, "AM" or "PM" flashes.
Press or to set correct time. Each press will increase or decrease 1min. If the
button is kept depressed, time will change quickly.
After time setting is confirmed, press SET, "AM "and "PM" stop flashing, while clock
starts working.
NOTE: Cooling only unit do not have displays and functions related with heating
5
Operation mode AUTO FAN
COOL DRY
Remote controller
Display board

7
Operation
Remote controller's operation
When in use, put the signal transmission head directly to the
receiver hole on the indoor unit.
The distance between the signal transmission head and the
receiver hole should be within 7m without any obstacle as well.
Don't throw the controller, prevent it from being damaged.
When electronic-started type fluorescent lamp or change-over
type fluorescent lamp or wireless telephone is installed in the
room, the receiver is apt to be disturbed in receivering the signals
so the distance to the indoor unit should be shorter.
Loading of the battery
Load the batteries as illustrated. 2 R-03 batteries, resetting key (cylinder)
Remove the battery cover:
Slightly press " " and push down the cover.
Load the battery:
Be sure that the loading is in line with the" + "/"-"
pole request as illustrated.
Put on the cover again
Confirmation indicator:
In disorderation, reload the batteries or load the new batteries after 6mins.
Note:
Use two new same-typed batteries when loading.
If the remote controller can't run normally or doesn't work at all,
use a sharp pointed item to press the reset key.
Hint:
Remove the batteries in case unit won't be in usage for a long period.
If there are any display after taking-out just need to press reset key.
Power failure resume(please set and apply as necessary)
If sudden power failure occurs, the unit will resume original operation when power is
supplied again.
Note: When sudden power failure happens during unit operation in power failure resume mode,
the air conditioner is not desired for use in a long period, please shut off the power
supply in case that the unit automatically resume operation when power is re-supplied,
or press ON/OFF to turn off the unit when power resumes.
if

8
Operation
Hints
Remote controller can memorize settings in each operation mode. To run it next time just
select the operation mode and it will start with the previous setting.
No reelecting is needed.(TIMER ON/OFF、SLEEP、SWING needs reelecting)
Cautions: Note:
On cooling only unit, heating mode is not available, The above information is the
After replacing batteries, press ON/OFF, and display explanation of the displayed
becomes as follows: information therefore varies
Operation mode: AUTO, Temp. :No with those displayed in actual
operation.
Auto Operation
ON/OFF TEMP
SET
TIMER
CLOCKSWING
SLEEP
LOCK RESET
FAN
MODE
(1) Unit start
Press ON/OFF on the remote controller, unit starts .
(2) Select operation mode
Press MODE button. For each press, operation mode
changes as follows:
Remote controller:
Then Select Auto operation
AUTO COOL DRY FAN
Press FAN button. For each press, fan speed changes
as follows:
Remote controller:
(3) Fan speed selection
Air conditioner is running under displayed fan speed.
When FAN is set to AUTO, the air conditioner
automatically adjusts the fan speed according to room
temperature.
(4)Unit stop
Press ON/OFF button, the unit stops.
3
4
1
2
LO MED HIAUTO

Press MODE button. For each press, operation
9
Operation
(1) Unit start
mode changes as follows:
Press ON/OFF button, unit starts.
Previous operation status appears on display. (Not Timer setting)
(2) Select operation mode
AUTO COOL DRY FAN
(3) Select temp. setting
Press TEMP button.
Every time the button is pressed, temp. setting increases 1oC
Every time the button is pressed, temp. setting decreases 1oC
Unit will start running to reach the temp. setting on LCD.
Press FAN button. For each press, fan speed changes
(4) Fan speed selection
as follows:
AUTO LO MED HI
just press ON/OFF button and unit will run in previous status.
Hints
On cooling only unit, heating mode is not available.
Remote controller can memorize each operation status. When starting it next time,
ON/OFF TEMP
SET
TIMER
CLOCKSWING
SLEEP
LOCK RESET
FAN
MODE
1
2
3
4
3
5
Cool Operation
Air conditioner is running under displayed fan speed.
When FAN is set to AUTO, the air conditioner
automatically adjusts the fan speed according to room
temperature.
Remote controller:
(5) Unit stop
Press ON/OFF button, the unit stops.
Unit will run in operation mode displayed on LCD.
Stop display at your desired mode.
No reelecting is needed.(TIMER ON/OFF、SLEEP、SWING needs reelecting)

Press MODE button. For each press, operation
10
Operation
(1) Unit start
mode changes as follows:
Press ON/OFF button, unit starts.
Previous operation status appears on display. (Not Timer setting)
(2) Select operation mode
AUTO COOL DRY FAN
Unit will run in operation mode displayed on LCD.
Stop display at your desired mode.
(3) Select temp. setting
Press TEMP button.
Every time the button is pressed, temp. setting increases 1oC
Every time the button is pressed, temp. setting decreases 1oC
Unit will start running to reach the temp. setting on LCD.
Press FAN button. For each press, fan speed changes
(4) Fan speed selection
as follows:
AUTO LO MED HI
just press ON/OFF button and unit will run in previous status.
Unit runs at the speed displayed on LCD.
Hints
On cooling only unit, heating mode is not available.
Remote controller can memorize each operation status. When starting it next time,
COOL operation starts when room
temp. is higher than temp. setting. Ultra-low air flow
Temp. setting+2oC
Temp. setting
On reaching temp. setting, unit
will run in mild DRY mode.
ON/OFF TEMP
SET
TIMER
CLOCKSWING
SLEEP
LOCK RESET
FAN
MODE
In DRY mode, when room temperature becomes
lower than temp.setting+2oC,unit will run intermittently
at LOW speed regardless of FAN setting.
1
2
3
4
3
5
(5)Unit stop
Press ON/OFF button, the unit stops.
Dry Operation
No reelecting is needed.(TIMER ON/OFF、SLEEP、SWING needs reelecting)

Press MODE button. For each press, operation
11
Operation
(1) Unit start
mode changes as follows:
Press ON/OFF button, unit starts.
Previous operation status appears on display. (Not Timer setting)
(2) Select operation mode
AUTO COOL DRY FAN
Unit will run in operation mode displayed on LCD.
Stop display at your desired mode.
Press FAN button. For each press, fan speed changes
(3) Fan speed selection
as follows:
LO MED HI
Unit runs at the speed displayed on LCD.
Hints
ON/OFF TEMP
SET
TIMER
CLOCKSWING
SLEEP
LOCK RESET
FAN
MODE
1
2
3
4
(4) Unit stop
Press ON/OFF button, the unit stops.
Fan Operation
In FAN operation mode, the unit will not operate in COOL mode but only in FAN mode ,
AUTO is not available in FAN mode.And temp.setting is disabled.
In FAN mode,SLEEP operation is not available.

12
Operation
ON/OFF TEMP
SET
TIMER
CLOCKSWING
SLEEP
LOCK RESET
FAN
MODE
1.Status display of air sending
Horizontal flap
( Auto swing )
2.Up and down air flow direction(Use remote controller)
Pos.4
Remote controller
Blank
Move the vertical blade by a knob on air
conditioner to adjust left and right direction
referring to Fig.
3.Left and right air flow adjustment(manual)
Air Flow Direction Adjustment
Cautions:
Hints
As cold air flows downward in COOL mode, adjusting air flow horizontally will be much more
helpful for a better air circulation.
( Downward swing )
Pos.3
( Upward swing )
Pos.2
( Cool/Dry standard position)
Pos.1
Do not try to adjust the flap by hand.
When adjusting the flap by hand,turn off the unit ,and use the remote controller to restart the unit.
When humidity is high,condensate water might occur at air outlet if all vertical louvers are
adjusted to left or right.
It is advisable not to keep horizontal flap at downward position for a long time in COOLor DRY
mode ,otherwise, condensate water might occur..
For each press of SWING button, air flow direction on remote
controller display as follows according to different operation modes:
Pos.1 Pos.2 Pos.3 Pos.4
The horizontal flap
will swing according to the above positions

Comfortable SLEEP
Operation
Power Failure Resume Function
If the unit is started for the first time, the
compressor will not start running unless 3
minutes have elapsed. When the power
resumes after power failure, the unit will run
automatically, and 3 minutes later the
compressor starts running.
Before going to bed, you can simply press the
SLEEP button and unit will operate in SLEEP
mode and bring you a sound sleep.
Use of SLEEP function
After the unit starts, set the operation status,
then press SLEEP button before which the
clock must be adjusted and time being set.
Operation Mode
1. In COOL,DRY mode
1 hours after SLEEP mode starts, temp. will
become 1OC higher than temp. setting. After
another 1 hours, temp. rises by 1OC further.
The unit will run for further 6 hours then stops.
Temp. is higher than temp. setting so that room
temperature won't be too Iow for your sleep.
SLEEP operation starts SLEEP operation stops
Approx.6hrs
1 hr Rises 1OC
Rises 1OC
Temp.setting Unit stop
In COOL, DRY mode
1 hr
Operation
2. In AUTO mode
The unit operates in corresponding sleep
mode adapted to the automatically selected
operation mode.
3. In FAN mode
It has no SLEEP function.
When TIMER function is set, the sleeping function
can't be set up .After the sleeping function is set up,
if user resets TIMER function, the sleeping function
will be cancelled; the machine will be in the state of
timing-on.
4.
5.Note to the power failure resume:
press the sleep button ten times in five seconds
and enter this function after hearing four sounds.
And press the sleep button ten times within five
seconds and leave this function after hearing
two sounds.
ON/OFF TEMP
SET
TIMER
CLOCKSWING
SLEEP
LOCK RESET
FAN
MODE
13

14
Operation
You can let unit start or stop automatically at following times: Before you wake up in the
morning, or get back from outside or after you fall asleep at night.
Set Clock correctly before starting Timer operation
TIMER ON/OFF
(1)After unit start, select your desired operation mode.
Operation mode will be displayed on LCD.
(2)TIMER mode selection
Press TIMER button to change TIMER mode.
Every time the button is pressed, display changes as follows:
TIMER ON TIMER OFF TIMER ON-OFF
blank
Select your desired TIMER mode (TIMER ON or TIMER
OFF) ON or OFF will flash.
(3)Timer setting
Press HOUR / button.
Every time the button is pressed, time increases 10 min.
If button is kept depressed, time will change quickly.
Every time the button is pressed, time decreases 10 min.
If button is kept depressed, time will change quickly. Time
will be shown on LCD. It can be adjusted within 24 hours.
Timer mode indicator on indoor unit lights up.
(4)Confirming your setting
After setting correct time, press SET button to confirm, "ON"
or "OFF" stops flashing
Time displayed: Unit starts or stops at x hour x min. (TIMER
ON or TIMER OFF).
To cancel TIMER mode
Just press TIMER button several times until TIMER mode disappears.
Hints
After replacing batteries or a power failure happens, Time setting should be reset.
Remote controller possesses memory function, when use TIMER mode next time, just
press SET button after mode selecting if timer setting is the same as previous one.
ON/OFF TEMP
SET
TIMER
CLOCKSWING
SLEEP
LOCK RESET
FAN
MODE
ON
1
2
3
4
3
ON OFF ON
N
OFF
12:00
AM 12:00
PM 12:00
AM
ON OFF
12:00
PM
TIMER ON-OFF
Timer On/Off Operation

15
Operation
To cancel TIMER mode
(1)After unit start, select your desired operation mode
Operation mode will be displayed on LCD.
Every time the button is pressed, display changes as follows:
(2) Press TIMER button to change TIMER mode.
Select TIMER ON-OFF. "ON" will flash.
(3)Time setting for TIMER ON
If button is kept depressed, time will change quickly.
Every time the button is pressed, time decreases 10 min.
If button is kept depressed, time will change quickly.
Every time the button is pressed, time increases 10 min.
It can be adjusted within 24 hours.
Time will be shown on LCD.
AM refers to morning and PM to afternoon
Press HOUR button.
(4) Time confirming for TIMER ON
After time setting, press TIMER button to confirm.
"ON" stops blinking, While "OFF" starts blinking.
Time displayed: Unit starts at x hour x min.
(5)Time setting for TIMER OFF
Follow the same procedures in "Time setting for TIMER ON".
(6) Time confirming for TIMER OFF
After time setting, press SET button to confirm, "OFF" stops flashing
Time displayed: Unit stops at X hour X min.
Just press TIMER button several times until TIMER mode disappears.
ON/OFF TEMP
SET
TIMER
CLOCKSWING
SLEEP
LOCK RESET
FAN
MODE1
24
3
5
6
TIMER ON TIMER OFF TIMER ON-OFF
blank
ON OFF ON
N
OFF
12:00
AM 12:00
PM 12:00
AM
ON OFF
12:00
PM
TIMER ON-OFF
Timer On-Off Operation

Emergency Operation:
Pi Pi
16
Emergency operation and test operation
Operation
Use this operation only when the remote controller is defective or lost.
When the emergency operation switch is pressed, the " Pi "sound is
heard once, which means the start of this operation.
Room
temperature
Designated
temperature
Timer
mode
Fan
speed
Operation
mode
ABOVE 23oC 26oC AUTO COOLING
temperature is below 16o C, do not use it in the
Test operation:
Use this switch in the test operation when the room
normal operation.
operation starts with the air flow speed "Hi".
Continue to press the test operation switch for more
than 5 seconds. After you hear the "Pi" sound twice,
release your finger from the switch: the cooling
Removal of the restriction of emergency or test operation:
Pi
When the remote controller is manipulated, it gets the system back to the
normal operation mode.
Press the emergency operation switch once more, or manipulate through the
remote controller; the "Pi" sound, the emergency or test operation is terminated.
In this operation, the system automatically selects the operation
modes, cooling or heating, according to the room temperature:
It is impossible to change the settings of temp.and fan
NO
speed,It is also not possible to operate in timer or dry mode.
Test operation switch is the same as emergency switch.

For Smart Use of The Air Conditioner
Setting of proper room
temperature
Close doors and windows
during operation
If the unit is not to be used
for a long time, turn off the
power supply main switch.
Use the timer effectively
Use the louvers effectively
Do not block the air inlet
or outlet
Maintenance
Proper
temperature
During cooling operation
prevent the penetration of
direct sunlight with
curtain or blind
17
OFF

For Smart Use of The Air Conditioner
WARNING
Air Filter cleaning
Open the inlet grille by pulling it upward.
Remove the filter.
Clean the filter.
Attach the filter.
Close the inlet grille.
Push up the filter's center tab slightly until it is released
from the stopper, and remove the filter downward.
Use a vacuum cleaner to remove dust, or wash the filter with
water.After washing, dry the filter completely in the shade.
Attach the filter correctly so that the "FRONT" indication is
facing to the front.Make sure that the filter is completely
fixed behind the stopper.If the right and left filters are not
attached correctly, that may cause defects.
Remote Controller
Do not use the following for cleaning
Do not use water ,wipe the controller with a
dry cloth.Do not use glass cleaner or chemical
cloth.
Gasoline,benzine, thinner or cleanser may
damage the coating of the unit.
Hot water over 40OC(104OF) may cause
discoloring or deformation.
Wipe the air conditioner by using a soft and
dry cloth.For serious stains,use a neutral
detergent diluted with water.Wring the water
out of the cloth before wiping.then wipe off
the detergent completely.
Indoor Body
Before maintenance,be sure to turn off the system and the circuit breaker.
Maintenance
Once every
two weeks
18

Maintenance
1.Open the lnlet Grille
2.Detach the standard air filter
3.Attach Air Purifying Filter
4.Attach the standard air filter
(Necessary installation)
5.Close the Inlet Grille
Close the Grille surely
Slide the knob slightly upward to release the
filter, then withdraw it.
Put air purifying filter appliances into the
right and left filter frames. Detach old Air Purifying Filter
Replacement of Air Purifying Filter
NOTE:
The photocatalyst air purifying filter will be solarized in fixed time. In normal family,
it will be solarized every 6 months.
Prop up the inlet grille by using a small device named
grille-support which located in the right side of the ind-
oor unit.
ATTENTION:
The white side of the photocatalyst air purifying filter face outside,
and the black side face the unit.
The green side of the bacteria-killing medium air purifying filter face outside,
and the white side face the unit.
Please keep the bacteria-killing medium air purifying filter in the cool and dry conditions
avoid long time directly sunshine when you stop using it,or its ability of sterilization will
be reduced.
The bacteria-killing medium air purifying filter will be used for a long time,no need for
replacement. But in the period of using them ,you should remove the dust frequently
by using vacuum cleaner or flaping them lightly,otherwise ,its performance will be
affected.
19