SystemAir VRF series Owner's Manual

SYSVRF Indoor unit

VRF Indoor units

OWNER MANUAL

GB

1

owner’s manual

1. IMPORTANT SAFETY INFORMATION

To prevent injury to the user or other people and property
damage, the following instructions must be followed. Incorrect
operation due to ignoring of instructions may cause harm or
damage.

Ask your dealer for installation of the air conditioner.

Incomplete installation performed by yourself may result in a
water leakage, electric shock or fire.

Ask your dealer for improvement, repair, and
maintenance.

Incomplete improvement, repair, and maintenance may result
in a water leakage, electric shock or fire.

In order to avoid electric shock, fire or injury, or if you
detect any abnormality such as smell of fire, turn off the
power supply and call your dealer for instructions.

Never let the indoor unit or the remote controller get wet.

It may cause an electric shock or a fire.

Never press the button of the remote controller with a
hard, pointed object.

The remote controller may be damaged.

Never replace a fuse with that of wrong rated current or
other wires when a fuse blows out.

Use of wire or copper wire may cause the unit to break down
or cause a fire.

Never use a flammable spray such as hair spray, lacquer
or paint near the unit.

It may cause a fire.

Never touch the air outlet or the horizontal blades while
the swing flap is in operation.

Fingers may become caught or the unit may break down.

Never put any objects into the air inlet or outlet.
Objects touching the fan at high speed can be dangerous.

Never inspect or service the unit by yourself.
Ask a qualified service person to perform this work.

Do not dispose this product as unsorted municipal
waste. Collection of such waste separately for special
treatment is necessary.

Do not dispose of electrical appliances as unsorted
municipal waste, use separate collection facilities.

Contact you local government for information regarding the
connection systems available.

If electrical appliances are disposed of in landfills or
dumps, hazardous substances can leak into the ground
water and get into the food chain, damaging your health
and well-being.

To prevent refrigerant leak, contact your dealer.

When the system is installed and runs in a small room, it is
required to keep the concentration of the refrigerant, if by any
chance coming out, below the limit. Otherwise, oxygen in the
room may be affected, resulting in a serious accident.

If the refrigerant leaks in the room, contact with a fire of a
burner, a heater or a cooker may result in 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 air conditioner until a service person confirms
that the portion where the refrigerant leaks is repaired.

The cooling&heating indoor unit is applicable for the
cooling&heating and the cooling only outdoor
unit;the heating capacity of the indoor unit will be
effective only when the indoor unit connect to the
cooling&heating outdoor unit.

Do not use the air conditioner 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.

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.

W ARNING

The safety precautions listed are divided into two categories. In either
case, important safety information is listed which must be read.

CAUTION

Failure to observe a caution may result in injury or damage

to the equipment.

Failure to observe a warning may result in death. The
appliance shall be installed in accordance with national
wiring regulations.

CONTENTS PAGE

IMPORTANT SAFETY INFORMATION...........................................................1

PARTS NAMES...............................................................................................2

AIR CONDITIONER OPERATIONS AND PERFORMANCE..........................5

ADJUSTING AIR FLOW DIRECTION.............................................................6

MAINTENANCE.............................................................................................10

FOLLOWING SYMPTOMS ARE NOT AIR CONDITIONER TROUBLES....13

TROUBLESHOOTING...................................................................................14



WARNING

CAUTION

owner’s manual

2

In order to avoid electric shock or fire, make sure that an
earth leak detector is installed.

Be sure the air conditioner is grounded.

In order to avoid electric shock, make sure that the unit is
grounded and that the earth wire is not connected to gas or
water pipe, lightning conductor or telephone earth wire.

In order to avoid injury, do not remove the fan guard of
the outdoor unit.

Do not operate the air conditioner if wet.

An electric shock may occur.

Do not touch the heat exchanger fins.

These fins are sharp and could result in cutting injuries.

Do not place items which might be damaged by moisture
under the indoor unit.

Condensation may form if the humidity is above 80%, the
drain outlet is blocked or the filter is polluted.

After a long use, check the unit stand and fitting for
damage.

If damaged, the unit may fall and result in injury.

To avoid oxygen deficiency, ventilate the room
sufficiently if equipment with burner is used together
with the air conditioner.

Arrange the drain hose to ensure smooth drainage.

Incomplete drainage may cause water damage to the
building, furniture etc.

Never touch the internal parts of the controller.
Do not remove the front panel. Some parts inside are
dangerous to touch, and machine breakdown may occur.

Never expose little children, plants or animals directly to
the air flow.

Adverse influence to little children, animals and plants may
result.

Do not allow children to play on the outdoor unit or avoid
placing any object on it.

Falling may result in injury.

Do not operate the air conditioner when using a room
fumigation - type insecticide.

Failure to observe could cause the chemicals to become
deposited in the unit, which could endanger the health of
those who are hypersensitive to chemicals.

Do not place appliances which produce open fire in
places exposed to the air flow from the unit or under the
indoor unit.

It may cause incomplete combustion or deformation of the
unit due to the heat.

Do not install the air conditioner at any place where
flammable gas may leak out.

If the gas leaks out and stays around the air conditioner, a
fire may break out.

The appliance is not intended for use by young children
or infirm persons without supervision.

2. PARTS NAMES

! Four-way cassette type

Air Out Louver (Adjustable)

Lock buckle
(For closing the Air Grille)

Air Intake

(Intake air from here)
Air Filter
(Filter the dust in the intake air)

Grounding Screw
(In the control box)

Two-direction or Three-direction Air
Outlet For the detailed information
please consult your local dealer.

! Ceiling-floor type

Air Outlet Horizontal Louver

Air Intake
(Intake room air)

Air Filter
(Filter the dust in the air)

Air Filter (Filter the dust in the intake air)

Air Out Horizontal Louver
(Adjust air-out direction)

Grounding Screw
(In the control box)

Air Intake

! One-way cassette type

Fig.2-1

Fig.2-2

Fig.2-3

NOTE

All the pictures in this manual are for explanation purpose only.
They may be slightly different from the air conditioner you
purchased(depend on model). The actual shape shall prevail.

owner’s manual

3

• Small one-way cassette type

Air Filter
(Filter the dust in the air)

Air Intake
(Intake room air)

Grounding Screw
(In the control box)

Air Outlet Horizontal Louver
(Adjust the air-out directions. )

• Wall-mounted type

Grounding Screw
(In the control box)

Air Filter
(Filter the dust in the air)

Air Intake
(Intake room air)

Lock Buckle
(For closing the air
intake grille)

Air Outlet
(Connect the duct)

• Duct/ceiling type

Air Outlet

(Outlet room air)

Air Intake

(Intake room air)

Electric control box

Heat Exchanger

(Exchange cool air into warm air)

• High static pressure duct type

One refrigerant system

Air Filter (Filter the dust in the intake air)

Grounding Screw
(In the control box)

Air Intake

Air Out, Air Out Louver
(Adjust the air-Aout direction)

Fig.2-4

Fig.2-7

Fig.2-8

Fig.2-9

Air return grille: Induced air, decoration
Dust filter: Filter the dust in the induced air
Grille bolt-lock: Lock the air return grille
Air deflector: Control the blow out

direction of the air

Display panel:Display the status information
receive the remote controller signal

Fig.2-5

Fig.2-6

Wire cable inlet: Intake of the power and
communication wires

Electronic control box: The control
component of the air-conditioner

Air return port: Induced the indoor air

Water plug for maintenance: Water level
sensor for water drainage and checking
under maintenance

Air outlet: Blow out the cool and heat air flow

• Small one-way cassette type

(The second generation 18-36 model)

owner’s manual

Air Outlet

(Outlet room air)

Air Intake

(Intake room air)

Electric control box B Electric control box A

Two refrigerant system

Air Outlet
(Outlet room air)

Heat Exchanger
(Exchange cool air into warm air)

Air Intake
(Intake room air)

! (Thin) Duct/ceiling type

Indoor unit

Connecting pipe

Hi-pressure pipe

Inlet pipe

Throttle part

Low-pressure pipe

Outlet pipe

Electric control box

Fig.2-10

Fig.2-11

Fig.2-12

Fig.2-14

4

! Low static pressure type

Air Outlet
(Connect the duct)

Grounding Screw
(In the control box)

Control Box

Air Intake
(Intake room air)

Air Filter
(Filter the dust in the air)



! Console type



Air flow louver
(at air outlet)

Air inlet
(with air filter in it)

Installation part

Display panel

Drain pipe

Air flow louver
(at air outlet)

Fig.2-15

Fig.2-13

Air Outlet

(Outlet room air)

Air Intake

(Intake room air)

Heat Exchanger

(Exchange cool air into warm air)

Electric control box

! Middle static pressure duct type

• Floor standing type

● Version I

Vertical unit with casing,with air intake from front and air
outlet on top, for installation on a wall or on feet on the floor.

● Version II

Vertical unit with casing,with air intake from below and air
outlet on top, for installation on a wall or on feet on the floor.

● Version III

Vertical unit for flush mounting,with air intake from below and

air delivery at the top, for installation on a wall.

Air out, air out louver
(Adjust the air-out direction)

Air Intake
(Intake room air)

Air intake

(Intake room air)

Air out, air out louver
(Adjust the air-out direction)

Feet (Lift up the
air conditioner)

Air filter
(Filter the dust in the air)

Electric control box

Air outlet
(Outlet room air)

Air intake
(Intake room air here)

Air filter
(Filter the dust in the air)

Use the system in the following temperature for safe and
effective operation. The Max operation temperature for
the air conditioner.(Cooling/Heating)

3. AIR CONDITIONER OPERATIONS AND
PERFORMANCE

Cooling operation

Heating operating

(cooling only type without)

Mode

Temperature

Indoor
temperature

If air conditioner is used outside the above conditions, it may
cause the unit to function abnormally.

The phenomenon is normal that the surface of air conditioning
may condense water when the relative humidity is very high in
the room, please close the door and window.

Optimum performance will be achieved within these operating
temperature range.

Protection device will be activated and the unit stops when the
above conditions can not be achieved.

1

2

3

4

NOTE

Table 3-1

Indoor Humidity Below 80%
80% humidity or above will cause the
machine surface condensing dew.

17°C ~ 32°C

≤27°C

Fig.2-16

Fig.2-17

owner’s manual

5

Fig.2-18

Fig.2-19

• Two-way cassette type

Air Out Louver

(Adjustable)

Air Filter

(Filter the dust in the intake air)

Air Intake

(Intake room air)

Inlet grille

Electric control box

6

owner’s manual

● Heating operation

Adjust the louver down.

When using the panel with auto.louver, press SWING button , the
auto, louver will swing automatically and the best cooling (heating)
effects will be achieved.

■ Adjust the air direction up and down

● Auto-swing

■ One-way cassette type

Press SWING button, the louver will swing up and down.

Maximum air
circulation area

Fig.4-3

4. ADJUSTING AIR FLOW DIRECTION.

Because cold air flow down and hot air flow up,to improve the
the cooling and heating effect, please adjust air flow louver
direction, in result the temperature of the room will be natural
and equal and you will fell more comfortable.

NOTE

The heating operation with horizontal air outlet will increase the
difference of the room temperature.

The louver direction :
Choose horizontal outlet mode when cooling operation
When the cooling operation,the air flow down will cause
condensing dew on the air outlet and louver surface.

1

2

● Cooling operation

Adjust the louver horizontally .

■ Four-way cassette type

Fig.4-1

Fig.4-2

● To maintain the comfortable temperature.

Adjust the air-out direction by using the air-out louver.

Please note the following correct operation for saving
energy and achieving the quick and comfortable
cooling/heating effects.

● The blocked air filter will reduce cooling/heating effects.

● Close the door/window

Do not let the heat/cool air leak from the door/widow.

close the door/window

check

regularly

● Do not overcool or overheat.

Do not expose yourself to the cool airflow for a long time.
To be overly chilled may harm your health.
Especially for the handicapped, children or old.

Do not

overcool

owner’s manual

7

● When heating

● Cooling operation

Adjust the louver horizontally .

● When cooling

Adjust the louver horizontally.

Adjust the louver down(vertically).

● When heating

Adjust the louver down(vertically).

■ Adjust the air direction left and right

■ Adjust left and right

■ Adjust the air flow up and down

Adjust the blade inside the air outlet louver to the desired
direction.

When the air flow sideways and the air flow parts must be used
(sold separately), please refer to the following figures to adjust the
air flow direction.

The louver is horizontal

NOTE

1 Please adjust the horizontal louver down when the air flow is
down.

Horizontal louver

Less than 40°

2 The slant angle of horizontal louver must be

Less than 40°

otherwise condensation drops may occur.





vertical louver

vertical louver

When adjusting air flow left /right, refer to the following figures to
turn the vertical louver to certain angles. Do not adjust the blade
angle too much, otherwise condensation drops may form on blade.

NOTE

The following is how to adjust the air flow direction when the air
outlet parts (sold separately) is used with the indoor unit.

To effectively cool the bottom of the room please set the louver
sideways.

■ Duct-ceiling type

● When cooling

● When heating

To effectively heat the bottom of the room please set the louver
downwards.

Fig.4-4

Fig.4-5

Fig.4-6

Fig.4-7

Fig.4-8

Fig.4-10

Fig.4-9

(Fig.4-9)

(Fig.4-10)



8

owner’s manual

● When heating

● Auto-swing

Adjust the louver downwards (vertically).

● Manual swing

Adjust the Air Flow Direction Up and Down

Press SWING button, the louver will swing up and down
automatically.

Adjust the louver to achieve the better cooling/ heating
effects when cooling/heating.

● When cooling

Adjust the louver horizontally.

CAUTION

Condensation drops may form on the surface of the unit or horizontal

louver when cooling while the air-out direction is vertically down.

Indoor temperature will not be even on the heating mode when
the air-out direction is horizontal.

Do not move the horizontal louver with hands, or malfunction
may occur. Adjust it with the swing button on the wire controller.

1

2

3

■ Ceiling-floor type

● Auto-swing

Press SWING button, the louver will swing up and down
(left and right) automatically.

● Manual swing

Adjust the louver to achieve the better cooling/ heating
effects when cooling/heating.

● When cooling

Adjust the louver horizontally.

● When heating

Adjust the louver downwards (vertically).

Fig.4-11

Fig.4-12

Fig.4-13

Fig.4-14

Fig.4-15

Fig.4-16

■ Wall-Mounted type

■ Console type

● Auto-swing

Press SWING button, the louver will swing up and down
automatically.

● Manual swing

Press Air Direction button,the louver can be fixed at a
desired angle.The louber swing (upward or downward )
to a certain angle for each press.

Fig.4-17

■ Adjust the air direction up and down

owner’s manual

9

Adjust the louver to achieve better cooling/heating effects
when cooling/heating.

• Digital scroll floor standing type

Fig.4-21

! When heating

Adjust the louver downwards (vertically).(Refer to Fig.4-19)

! When cooling

Adjust the louver horizontally.(Refer to Fig.4-18)

Fig.4-18

Fig.4-19

Do not try to adjust the horizontal louver by hand.
When adjusting by hand, the mechanism may not operate
properly or condensation may drip from air outlets.

CAUTION

• Adjust the air direction left and right

Hold the knob and move the louver.You will find a knob
on the left-side and the right-side blades.



Fig.4-20

Before opening the front panel,be sure to stop the
operation and turn the breaker OFF.
Do not touch the metal parts on the inside of the indoor
unit, as it may result in injury.

Open the front panel.
How to open the front panel:(Refer to Fig.5-4).

CAUTION

• Air flow selection

Table 4-1

Make air flow selection according to what suits you.
(Pleas refor to Fig. 7-2 about the position of)

When setting the air flow selection switch to .

Air conditioner automatically decides the appropriate
blowing pattern depending on the operating mode/
situation.

During Dry mode,so that cold air does not come into
direct contact with people,air is blown upper air outlet.

Regardless of the operating mode or situation,air blows
from the upper air outlet.

Use this switch when you do not want air coming out of
the lower air outlet.(While sleeping etc.)

Operating

mode

Situation

Blowing

pattern

COOL mode HEAT mode

When the room
has become fully
cool,or when one
hour has passed
since turning on
the air condition­er.

So that air does
not come into dir­ect contact with
people,air is blo­wn upper air ou­tlet,room tempe­rature is equaliz­ed.

At start of
operation or
other times
when the
room is not
fully cooled.

At times other than below.(
Normal time.)

Air is blown from the

upper and lower air

outlets for high spe-

ed cooling during

COOL mode,and for

filling the room with

warm air during

HEAT mode.

At start or when
air temoerature
is low.

So that air does
not come into
direct contact
with people.Air
is blown upper
air outlet.

When setting the air outlet selection switch to .

For switching the Auto/Manual mode of the lower air outlet,
one should unplug and restart the unit for mode renewing.

CAUTION

• Two-way cassette type

! Auto-swing

Press SWING button, the louver will swing up and down
automatically.

Fig.4-22

10

owner’s manual

• Method for cleaning the air filter

5. MAINTENANCE

Before you clean the air conditioner, be sure the power
supply is off.

Check if the wiring is not damaged or disconnected.

Use a dry cloth to wipe the indoor unit and remote
controller.

A wet cloth may be used to clean the indoor unit if it is
very dirty.

Never use a damp cloth on the remote controller.

Do not use a chemically-treted duster for wiping or
leave such material on the unit for long.
it may damage or fade the surface of the unit.

Do not use benzine, thinner, polishing powder, or
similar solvents for cleaning.
These may cause the plastic surface to crack or
deform.

1

2

3

4

5

6

7

CAUTION

CAUTION

● The air filter can prevent the dust or other parcticles from going

inside. In case of blockage of the filter, the working effeciency
of the air conditioner may greatly decrease, therefore, the filter
must be cleaned twice a month during prolonged use.

● If the air conditioner is positioned in a dusty place, the cleaning

frequency of the air filter must be increased.

● If the accumulated dust is too heavy to be cleaned, please

replace the filter with a new one(the replaceable air filter is an
optional fitting).

1. Take out the inlet grille

● For Four- Way Cassette Type

Push the grille switches towards the middle simultaneously as
indicated in Sketch Fig.5-1 . Then pull down the inlet grille.
Take out the inlet grille (together with the air filter shown in

Sketch Fig.5-2). Pull the inlet grille down at 45° and lift it up to
take out the grille.

Fig.5-2

The control box cables, which are originally connected with the
main body electrical terminators must be pulled off before doing
as indicated above.

Fig.5-1

! When cooling

Adjust the louver horizontally.

! Manual swing

Adjust the louver to achieve the better cooling/ heating
effects when cooling/heating.

Fig.4-23

Fig.4-24

! When heating

Adjust the louver downwards (vertically).

Do not try to adjust the louver by hand.
When adjusting by hand, the mechanism may not operate properly
or condensation may drip from air outlets.

CAUTION

owner’s manual

11

●

For Duct/Celling Type

Push the grille switches to the arrow directions, then open the
inlet grille downwards. Turn back the air filter fixing block, then
take out the inlet grille.

● For One-Way Cassette Type

Remove the inlet grille , hold the air-in buckle with two hands
and open the grille downwards, pull it towards inside part and
push the filter buckle to remove the grille.

Air filter

Fig.5-3

! For digital scroll floor standing type

The filter is housed in the lower part of the unit in versions II and
III which take in air from below or from the rear,To remove the
filter in versions II and III proceed as followed.

While it is housed in the front cowl in version I,which take in air
from the front.
To remove the filter in version I, proceed as followed.

Fig.5-9

Fig.5-10

" Take off the inlet grille from the panel.

Air Outlet

Selection Switch

special function filter

● For Console Type

Push the grille switches to the arrow directions, then open the
inlet grille downwards. Press the claws on the right and left of the
air filter down slightly, then pull upward.

Fig.5-6

Hold the tabs of the frame,and remove the claws in 4 places.
(The special function filter can be renewed by washing it with
water once every 6 months.We recommend replacing it once
every 3 years.)

Fig.5-7

Fig.5-8

" Two-way cassette type

1) Upright row (non-directional) one side of the inlet grille, and

putdown the other side, and then slide follow the arrow’s

direction refers to Fig.5-9

2) Loosen the hanger of the putdown side refers to Fig.5-10

3) Open the inlet grille (about 45°), and remove the other side,

refers to Fig.5-11

● For One-Way Cassette Type

(The second generation 18-36 model)

Fig.5-4

Fig.5-5

Do not dry out the air filter under direct sunshine or with fire.

For the one-way cassette type , the air filter should be installed
before the unit body installation.

1

2

2. Dismantle the air filter.

3. Clean the air filter

4. Re-install the air filter.

5. Install and close the inlet grille in the reverse orders of step
1 and 2 and connect the control box cables to the corre
sponding terminators of the main body.

CAUTION

The air filter can prevent the dust or other particulate from
going inside .In case of blockage of the filter , the working
efficiency of the air conditioner may greatly decrease .

Therefore , the filter must be cleaned twice a month during
prolonged use.

Clean the air filter with vacuum cleaner or water.

a.The inlet side should face up when using vacuum
cleaner. (Refer to

Fig.5-13)
b.The inlet side should face down when using clean water.
(Refer to Fig.5-14)

If the dust accumulation is too heavy, please use soft bursh and
natural detergent to clean it and dry in the cool place.

Fig.5-15

Fig.5-16

12

owner’s manual

Inlet grille

According to the figure shown in the position and
direction of arrow, press the filter and take it down. In the
same way,take down the filter on the other side,and put it
back after cleaning.

!

Air Out Louver

(Adjustable)

Air Filter

(Filter the dust in the intake air)

Air Intake

(Intake room air here)

Inlet grille

Fig.5-11

Fig.5-12

Fig.5-13

Fig.5-14

When the power switch is connected, some energy will be
consumed, even if the unit is not in operation. So please
disconnect the power to save the energy.

A degree of dirt will be accumulated due to certain performance
after several seasons of operation. So special maintenance is
advised.

Take out of the batteries from the remove controller.

NOTE

Maintenance before a long stop period

(eg. at the end of the season)

Let the indoor units run in fan only operation for about half a
day in order to dry the interior of the units.

Clean air filters and casings of indoor units.

Refer to “Cleaning the air filter" for details on how to proceed
and make sure to install cleaned air filters back in the same
position.

Turn off the unit with the “ON/OFF” button on the remove
controlller,then disconnect the power.

6. FOLLOWING SYMPTOMS ARE NOT AIR
CONDITIONER TROUBLES

Symptom 1: The system does not operate

Symptom 2: Change into the fan mode during
cooling mode

Symptom 3: White mist comes out of a unit

Symptom 4: Noise of air conditionerscooling

The air conditioner does not start immediately after the ON/OFF
button on the romote controller is pressed.
If the operation lamp lights, the system is in normal condition.To
prevent overloading of the compressor motor, the air
conditioner starts 3 minutes after it is turned ON.

If the operation lamp and the "

PRE-DEF indicator(cooling and

heating type) or fan only indicator(cooling only type)"

light, it
means you choose the heating model, When just starting, if the
compressor has not started, the indoor unit appears "anti cold
wind" protection because of too low outlet temperature.

In order to prevent the indoor evaporator frosting, the system
will change into fan mode automatically, restore to the cooling
mode will be done automatically after.

Symptom 3.1: Indoor unit

Symptom 3.2: Indoor unit, outdoor unit

Symptom 4.1: Indoor unit

When humidity is high during cooling operation If the interior of
an indoor unit is extremely contaminated, the temperature
distribution inside a room becomes uneven. It is necessary to
clean the interior of the indoor unit. Ask your dealer for details
on cleaning the unit. This operation requires a qualified service
erson

When the system is changed over to heating operation after
defrost operation Moisture generated by defrost becomes
steam and is exhausted.

Symptom 4.2: Indoor unit, outdoor unit

A continuous low hissing sound is heard when the system is in
operation.
This is the sound of refrigerant gas flowing through both indoor
and outdoor units.

A hissing sound which is heard at the start or immediately after
stopping operation or defrost operation.
This is the noise of refrigerant caused by flow stop or flow
change.



.

A continuous low hissing sound is heard when the system is in
cooling operation or at a stop.
When the drain pump (optional accessories) is in operation,this
noise is heard.

A squeaking sound is heard when the system stops after heating
operation.
Expansion and contraction of plastic parts caused by
temperature change make this noise.

Symptom 4.3: Outdoor unit

When the tone of operating noise changes.
This noise is caused by the change of frequency.

Symptom 5: Dust comes out of the unit

Symptom 6: The units can give off odours

When the unit is used for the first time in a long time.
This is because dust has got into the unit.

The unit can absorb the smell of rooms, furniture, cigarettes,
etc., and then emit it again.

Symptom 7: The outdoor unit fan does not
spin.

During operation. The speed of the fan is controlled in order to
optimize unit operation.

When the room temperature drops to the set temperature, the
compressor turns off and the indoor unit changes to fan mode;
when the temperature rises up, the compressor starts again. It
is same in the heating mode.

owner’s manual

13

Maintenance after a long stop period

(eg. at the beginning of the season)

Check and remove everything that might be blocking inlet
and outlet vents of indoor units and outdoor units.

Clean air filters and casings of indoor units.
Refer to "Cleaning the air filter" for details on how to
proceed and make sure to install cleaned air filters back in
the same position.

Turn on the power at least 12 hours before operating the
unit in order to ensure smoother operation. As soon as he
power is turned on, the remote controller displays appear.

Digital scroll central air conditioning
auxiliary heating equipment

In winter, due to the difference of the area and building
construction, please purchase the indoor unit with auxillary
heating to enlarge the capacity.

When turning to the heat mode the air conditioner with
auxiliary heating will run at the set term.

It’s not advised to auxiliary heating equipments on site for
4-way cassttte type and duct/celling type(with auxiliary
heating).

14

owner’s manual

7. TROUBLE SHOOTING

7.1 Troubles and causes of air conditioner

Solution

Clean the heat exchanger.

Clean the air filter.
Eliminate all dirt.
Close doors and windows.
Use curtains in order to shelter from
sunshine.
Reduce heat source.
AC cooling capacity reduces (normal).
Check leakage and rightly recharge
refrigerant.

Symptoms

Causes

Unit does not start

Air flows normally but does
not cool

Units start or stop frequently

Low cooling effect

Low heating effect

Power failure.
Power switch is off.
Fuse of power switch may have burned.
Batteries of remote controller exhausted
or other problem of controller.

Temperature is not set correctly.
Be in 3 minutes protection of
compressor.

Refrigerant is too little or too much.

Air or no concreting gas in the
refrigerating circuit.
Compressor is malfunction.
Voltage is too high or too low.
System circuit is blocked.

Outdoor unit and indoor unit heat
exchanger is dirty.
The air filter is dirty.
Inlet/outlet of indoor/outdoor units is
blocked.
Doors and windows are open
Direct sunlight.

Too much heat resource.
Outdoor temp. is too high.
Leakage of refrigerant or lack of
refrigerant.

Wait for the comeback of power.
Switch on the power.
Replace the fuse.
Replace the batteries or check the
controller.

Set the temperature properly.
Wait.

Check leakage, and rightly recharge
refrigerant.
Vacuum and recharge refrigerant.

Maintenance or change compressor.
Install manostat.
Find reasons and solution.

Use heating device.
Close doors and windows.

Check leakage and rightly recharge
refrigerant.

Outdoor temperature is lower than 7°C.
Doors and windows not completely
closed.
Leakage of refrigerant or lack of
refrigerant.

Table 7-1

If one of the following malfunctions occur, stop operation, shut off the power, and contact with your dealer.

Remote controller receives malfunction or the button does not work well.

A safety device such as a fuse, a breaker frequently actuates.

Obstacles and water enter the unit.

Water leaks from indoor unit.

Other malfunctions.

If the system does not properly operate except the above mentioned cases or the above mentioned malfunctions is
evident, investigate the system according to the following procedures. (See in Table 7-1)

Table 7-2

Symptoms

Causes

The fan speed can not be
changed.

Check whether the MODE
indicated on the display is
"AUTO"

Check whether the MODE
indicated on the display is
"DRY"

When the automatic mode is
selected, the air conditioner will
automatically change the fan

speed.

When dry operation is selected,
the air conditioner automatically
change the fan speed. The fan
speed can be selected during
"COOL" , "FAN ONLY",

and

"HEAT".

The remote controller signal is
not transmitted even when
the ON/OFF button is pushed.

Check whether the batteries
in the remote controller are
exhausted.

The power supply is off.

No receiving tone sounds
from the indoor unit even
when the ON/OFF button is
pressed.

Check whether the signal
transmitter of the remote
controller is properly directed

to the infrared signal receiver
of the indoor unit when the
ON/OFF button is pressed.

Directly transmit the signal transmitter
of the remote controller to the infrared
signal receiver of the indoor unit, and
then repeatly push the ON/OFF button
twice.

The indication on the display
disappears after a lapse of
time.

Check whether the timer
operation has come to an
end when the TIMER OFF

is indicated on the display.

The air conditioner operation will
stop up to the set time.

The TIMER ON indicator
goes off after a lapse of
certain time.

Check whether the timer
operation is started when
the

TIMER ON is indicated

on the display.

Up to the set time, the air conditioner
will automatically start and the
appropriate indicator will go off.

The TEMP. indicator does
not come on.

Check whether the MODE
indicated on the display is
FAN ONLY

The temperature cannot be set during
FAN mode.

Solution

7.2 Troubles and causes of remote controller

7.3 Fault information and code

Before asking for serving or repairing, check the following points.(See in Table 7-2)

Fault information is only applicable for the indoor units with panel,and only the panel with digit displays will show
the fault code,otherwise just four LED lamps. The fault indication of LED and digit displays see the following form.

owner’s manual

15

16

owner’s manual

Table.7-3

NO. Type Contents

LED flash

The Fault Indication Of LED The Fault Indication Of Digit Displays

Remarks

The evaporator
sensor check
point is abnomal
or room temp.
sensor is
abnormal.

Indoor/outdoor unit
communication
is abnormal

Water level switch
is abnormal

Mode conflict

The run LED
flashes fast

The timer LED
flashes fast

The alarm LED
flashes fast

The defrost LED
flashes fast

After the malfunctions
disappear, it restores
automatically.

After the malfunctions
disappear, it restores
automatically.

After the malfunctions
disappear, it restores
automatically.

When the indoor unit
turns to heating mode
or is turned off, the
alarm will disappear.

1

2

3

4

5

Malfun­ction

Malfun­ction

Malfun­ction

Malfun­ction

Alarm

After the malfunctions
disappear, it restores
automatically.

Outdoor unit
is abnormal

The alarm LED
flashes slowly



6

7

4 LED flash
together

8

M_Home
mismatching

EEPROM error

Defrost LED flash
slowly



No address
when first time
power on

Timer LED and
run LED flash
together

Malfun­ction

Alarm

Alarm

After the malfunctions
disappear, it restores
automatically.

After the malfunctions
disappear, it restores
automatically.

When the indoor unit is
replaced with a correct
one or is turned off, the
alarm will disappear

Table.7-4

NO. Type Contents

Display content Remarks

Room temp.
sensor is
abnormal.

Indoor/outdoor unit
communication
is abnormal

Water level switch
is abnormal

Mode conflict

E2

E1

EE

E0

After the malfunctions
disappear, it restores
automatically.

After the malfunctions
disappear, it restores
automatically.

After the malfunctions
disappear, it restores
automatically.

When the indoor unit
turns to heating mode
or is turned off, the
alarm will disappear.

1

2

3

4

5

Malfun­ction

Malfun­ction

Malfun­ction

Malfun­ction

Alarm

After the malfunctions
disappear, it restores
automatically.

Outdoor unit
is abnormal

Ed



6

7

H0

8

M_Home
mismatching

EEPROM error

E7

No address
when first time
power on

FE

Malfun­ction

Alarm

Alarm

After the malfunctions
disappear, it restores
automatically.

After the malfunctions
disappear, it restores
automatically.

When the indoor unit is
replaced with a correct
one or is turned off, the
alarm will disappear

The evaporator
temp. sensor is
abnormal.

E3

After the malfunctions
disappear, it restores
automatically.

9

Malfun­ction

The evaporator
outlet temp.
sensor is
abnormal.

E4

After the malfunctions
disappear, it restores
automatically.

10

Malfun­ction

SYSVRF indoor units_OM

EN - April 2014

202000191029(WP-MDV03U-011PW)