INVENTOR V4MDI-18/U4MRS-18, V4MDI-50/U4MRT-50, V4MDI-24/U4MRS-24, V4MDI-60/U4MRT-60, V4MDI-36/U4MRS-36 User Manual

• USER’S MANUAL

• ΕΓΧΕΙΡΙΔΙΟ ΧΡΗΣΗΣ

• MANUAL UTILIZATORULUI

ENGLISH | ΕΛΛΗΝΙΚΑ | ROMANA

DUCT TYPE

MODELS:

V4MDI-18/U4MRS-18
V4MDI-24/U4MRS-24
V4MDI-36/U4MRS-36
V4MDI-42/U4MRT-42
V4MDI-50/U4MRT-50
V4MDI-60/U4MRT-60

INDOOR UNIT

OUTDOOR UNIT

Wire controller(on some models)

Air filter(on some models)

Air inlet(side and rear)

Air outlet

Fig.1

1

2

3

4

5

6

7

8

9

10

8

9

Electric control cabinet

1
2

3
4
5
6

7
8
9

10

Connecting pipe

Air inlet

Drain pipe

Air outlet

Air inlet

INDOOR UNIT

OUTDOOR UNIT(A,B,C)

M

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.

(A) (B)

(C)

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, and fire.

Ask your dealer for improvement, repair, and
maintenance.

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

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.

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.

It is not good for your health to expose your body to the
air flow for a long time.

Do not insert fingers, rods or other objects into the air
inlet or outlet.

When the fan is rotating at high speed, it will cause injury.

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
groundeater 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.

The refrigerant in the air conditioner is safe and normally
does not leak.

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 safty precautions listed here are divided into two categories. In
either case, important safty information is listed which must be read
carefull y .

Failure to observe a caution may result in injury or damage
to the equipment.

in death.

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

CONTENTS PAGE

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

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

AIR CONDITIONER OPERATIONS AND PERFORMANCE...........................3

HINTS FOR ECONOMICAL OPERATION

....................................................

3

MAINTENANCE

.......................................................................................

3

FOLLOWING SYMPTOMS ARE NOT AIR CONDITIONER TROUBLES........5

TROUBLESHOOTING...............................................................................6

CAUTION

CAUTION

WARNING

WARNING

2

owner’s manual

NOTE

2. PARTS NAMES

The air conditioner consists of the indoor unit, the outdoor unit,
the connecting pipe and the remote controller.

(Refer to Fig.2-1)

Function indicators on indoor unit display panel

Display panel

This manual does not include Remote Controller
Operations, see the<<Remote Controller Owner's
manual>> packed with the unit for details.

PRE-DEF indicator(cooling and heating type)
or fan only indicator(cooling only type)

Infrared signal receiver
Display Digital tube

Operation lamp

Timer indicator

Alarm indicator

Temporary button

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

Do not operate the air conditioner with a wet hand.

An electric shock may happen.

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 wetting of 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 a machine trouble may happen.

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 a child to mount on the outdoor unit or
avoid placing any object on it.

Falling or tumbling 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 combuston 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.

Do not operate your air conditioner in a wet room such
as a bathroom or laundry room.

This 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. Children shall
not play with the appliance. Cleaning and user
maintenance shall not be made by children without
supervision.

Fig.2-1

This appliance is not intended for use by persons
(including children) with reduced physical, sensory or
mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person
responsible for their safety.

Children should be supervised to ensure that they do not play
with the appliance.

If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualified persons
in order to avoid a hazard.

FORCED AUTO
The OPERATION lamp is lit, and the air conditioner will run
under FORCED AUTO mode. The remote controller operation is
enabled to operate according to the received signal.

1

FORCED COOL
The OPERATION lamp flashes, the air conditioner will turn to
FORCED AUTO after it is enforced to cool with a wind speed of
HIGH for 30 minutes. The remote controller operation is
disabled.

OFF
The OPERATION lamp goes off. The air conditioner is OFF
while the remote controller operation is enabled.

2

3

For inverter type,this switch is used for after-sales service
purpose only,the user should not push it.

For fixed-frequency type,

this function is used to operate the unit
temporarily in case you misplace the remote controller or its
batteries are exhausted. Two modes including

FORCED

AUTO and FORCED COOL can be selected through the
TEMPORARY BUTTON on the air-in grill control box of the
indoor unit. Once you push this button, the air conditioner will
run in such order:

FORCED

AUTO, FORCED COOL, OFF,

and back to

FORCED

AUTO.

3

owner’s manual

NOTE

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

CAUTION

4. HINTS FOR ECONOMICAL OPERATION

The following should be noticed to ensure an economical operation.
(Refer to corresponding chapterfor details)

5. MAINTENANCE

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

Check if the wiring is not broken off 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

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
larger humidity in room, please close the door and
window.
Optimum performance will be achieved within these
operating temperature range.

2

3

Three-minute protection feature

A protection feature prevents the air conditioner from
being activated for approximately 3 minutes
when it restarts immediately after operation.

Power failure

Power failure during operation will stop the unit completely.

The OPERATION lamp on the indoor unit will start flashing
when power is restored.
To restart operation, push the ON/OFF button on the remote
controller.
Lightning or a car wireless telephone operating nearby may
cause the unit to malfunction.

Adjust the air flow direction properly to avoid winding toward
your body.

Adjust the room temperature properly to get a comfortable
situation and to avoid supercooling and superheat.

In cooling, close the curtains to avoid direct sunlight.

To keep cool or warm air in the room, never open doors or
windows more often than necessary.

Set the timer for the desired operating time.

Never put obstructions near the air outlet or the air inlet. Or it
will cause lower efficiency, even a sudden stop.

Adjust the air flow direction properly to avoid winding toward
your body.

Adjust the room temperature properly to get a comfortable
situation and to avoid supercooling and superheat.

In cooling, close the curtains to avoid direct sunlight.

To keep cool or warm air in the room, never open doors or
windows more often than necessary.

If you don't plan to use the unit for a long time, please
disconnect power and remove the batteries from the remote
controller. When the power switch is connected, some energy
will be consumed, even if the air conditioner isn't in operation.
So please disconnect the power to save energy. And please
switch the power on 12 hours before you restart the unit to
ensure a smooth operation.

A clogged air filter will reduce cooling or heating efficiency,
please clean it once two weeks.

Table 2-1

Table 2-2(for inverter type air conditioner)

Cooling operation

Dry operation

Heating operation

(cooling only type without)

Mode

Temperature

Outdoor
temperature

(for the models with low
temperature cooling system)

(for special tropical models)

(for special tropical models)

temperature

Room

18°C ~ 43°C / 64 °F~109°F

18°C ~ 52°C / 64 °F~126°F

-7°C ~ 43°C / 20 °F~109°F

-7°C ~ 24°C / 20 °F ~ 76°F

18°C ~ 43°C / 64 °F~109°F
18°C ~ 52°C / 64 °F~126°F

0°C ~ 30°C / 32 °F~86°F

17°C ~ 32°C
( 62 °F ~ 90°F)

17°C ~ 32°C
( 62 °F ~ 90°F)

Cooling operation

Dry operation

Heating operation

(cooling only type without)

Mode

Temperature

Outdoor
temperature

(for the models with low
temperature cooling system)

temperature

Room

0°C ~ 50°C / 32 °F~122°F

0°C ~ 50°C / 32 °F~122°F

-15°C ~ 50°C / 5 °F~122°F

-15°C ~ 24°C / 5 °F~76°F

0°C~30°C
(32°F~86°F)

17°C~32°C
(62°F ~90°F)

17°C~32°C
(62°F ~90°F)

4

owner’s manual

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.

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.

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.

Cleaning the air filter(on some models)

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 once two weeks during long
time usage.

If the air conditioner is installed in a dust place , clean the the air
filter frequent.

If the accumulated dust is too heavy to be cleaned , please
replace the filter with a new one(replaceable air filter is an
optional fitting).

The filter cleaning should be performed by a suitable service
provider.

For your purchasing unit is a rear ventilated one, please remove
the filter fixed screws（2 screws）and take down the filter away
from the unit.

For your purchasing unit is a descensional ventilated one, please
push the filter up slightly to let the position retainer escape away
from the flange fixed holes, and take off the filter according to the
arrow direction shows in the following fig.

Fig.5-4

Fig.5-3

Clean the air filter (Vacuum cleaner or pure water may be used
to clean the air filter. If the dust accumulation is too heavy ,
please use soft brush and mild detergent to clean it and dry out
in cool place) .

Fig.5-2

Fig.5-1

5

owner’s manual

CAUTION

The air-in side should face up when using vacuum cleaner.
(Refer to Fig.5-4)
The air-in side should face down when using water. (Refer to
Fig.5-3)

5. Re-install the air filter

6. Install and close the air-in grill in the reverse order of step 1
and 2 and connect the control box cables to the corresponding
terminators of the main body .

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

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

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 its overlow outlet temperature.

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

When the room temperature drops to the set temperature, the
compressor goes 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.

Symptom 3: White mist comes out of a unit

Symptom 3.1: 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

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.

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 gotten 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 product operation.

Sptom 4: Noise of air conditionerscooling

Symptom 3.2: Indoor unit, outdoor unit

Symptom 4.1: Indoor unit

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

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

6

owner’s manual

CAUTION

The operation lamp is flashing rapidly (5Hz). This lamp is still
flashing rapidly after turn off the power and turn on again.
(Refer to Table 7-1a,Table 7-1b and Table 7-2)

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

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. (Refer to Table 7-3)

7.1. Troubles and causes of air conditioner

Please cut off the power supply when appearing the
above malfunction, check if the voltage provided is out of
range, check if the installation of air-conditioner is
correct, then electrify again after 3 minutes power off. If
the problem is still existent, please contact the local
service station or the equipment provider.

7. TROUBLESHOOTING

7

owner’s manual

Table 7-1a

MALFUNC T ION & PROTEC T ION DEFINE

DISPLAYLED 4LED 3LED 2LED 1

E8

E1

E2

E3

E4

E7

EE

Ed

F3

F4

In-Outdoor unit C OMM. Check ing
channel i s abnormal

Room TE M P. sensor checking
channel i s abnormal

Pipe TEMP. Sens or checking
channel i s abnormal (T2)

EPPROM malfunct ion

Indoor fan motor speed out of control

Water-level alarm malfunction

Outdoor malfunction

Indoor twins communication malfunction

Other malfunction of twins

Light

Flashing at 2.5HZ

Fla shin g at 0.5HZ

DIGITAL TUB E

ALARMDEF.FANTIMEROPERATION

Pipe TEMP. Sens or checking
channel i s abnormal (T2B )

NO.

1

2

3

4

5

6

7

8

9

10

Applicable to inverter air conditioner only

8

owner’s manual

Table 7-2

Solution

Clean the heat exchanger.
Clean the air filter.
Eliminate all dirties and make air
smooth.
Close doors and windows.
Make 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 flowing normally but
completely can't cooling

Units start or stop frequently

Low cooling effect

Low heating effect

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

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.

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 concretingc gas in the
refrigerating circuit.
Compressor is malfunction.
Voltage is too high or too low.
System circuit is blocked.

Wait for the comeback of power.
Switch on the power.
Replace.
Replace the batterises 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.

Table 7-1b

MALFUNCTION & PROTECTION DEFINE

DISPLAY

LED 4LED 3LED 2LED1

E2

E3

E4

E6

E5

Flash ing a t 5HZ

Flash ing at1 HZ

DIGITAL TUBE

ALARMDEF.FANTIMER

OPERATION

•• •

•

•

•

•

•

•

E7

E8

•

•

•

Pump temperature sensor malfunction

Pipe temperature sensor checking channel
is abnormal

Water-level alarm malfunction

Room temperature sensor checking channel
is abnormal

EEPROM malfunction

Outdoor TEMP. sensor checking channel is
abnormal

Applicable to fixed-frequency air conditioner only

Light

DC motor speed out of control
Outdoor unit low pressure malfunction

Eb

Ed

Outdoor unit malfunction

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

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 wire
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 wire 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.

Table 7-3

Solution

7.2. Troubles and causes of wire controller

Before asking for serving or repairing , check the following points. (Refer to Table 7-3)

Check whether the signal
transmitter of the wire
controller is properly directed
to the infrared signal receiver
of the indoor unit.

9

owner’s manual

Activate your warranty.....

in

5

simple

steps!

For the electronic

warranty submission

please use the following link

http://www.inventorairconditioner.com/warranty-inventor

Scan here for the

warranty form

http://www.inventoraiconditioner.com
/warranty-inventor

Select the product type
(airconditioner or appliance) for
which the warranty will be activated

Choose the warranty that
corresponds to your product
purchase

Fill in the required information
(owner, retailer and appliance)
and press send

You will receive a confirmation

e-mail for the activation of
your warranty

Connect to the following link