MITSUBISHI ELECTRIC Ceiling Cassette Type Air Conditioners Instruction Manual

Ceiling Cassette Type Air Conditioners

CEILING CASSETTE TYPE AIR CONDITIONERS
INDOOR UNIT MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF

OPERATING INSTRUCTIONS

For user

· To use this unit correctly and safely, be sure to read these operating instructions before use.

English

OPERATING INSTRUCTIONS
CONTENTS

SAFETY PRECAUTIONS

1

PREPARATION BEFORE OPERATION

3

NAME OF EACH PART

4

SELECTING OPERATION MODES

5

FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT

6

I- SAVE OPERATION

6

ECONO COOL OPERATION

7

TIMER OPERATION (ON/OFF TIMER)

7

WEEKLY TIMER OPERATION

8

CLEANING

9

WHEN YOU THINK THAT TROUBLE HAS OCCURRED

11

WHEN THE AIR CONDITIONER IS NOT GOING TO BE USED FOR A LONG TIME

12

INSTALLATION PLACE AND ELECTRICAL WORK

12

SPECIFICATIONS

12

SAFETY PRECAUTIONS

Meanings of symbols displayed on indoor unit and/or outdoor unit

WARNING
(Risk of fire)

This unit uses a flammable refrigerant. If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire.

Read the OPERATING INSTRUCTIONS carefully before operation.

Service personnel are required to carefully read the OPERATING INSTRUCTIONS and INSTALLATION MANUAL before operation.

Further information is available in the OPERATING INSTRUCTIONS, INSTALLATION MANUAL, and the like.

· Since rotating parts and parts which could cause an electric shock are used in this product, be sure to read these “Safety Precautions” before use.
· Since the cautionary items shown here are important for safety, be sure to observe them.
· After reading this manual, keep it together with the installation manual in a handy place for easy reference.
·Be sure to receive a guarantee card from your dealer and check that the purchased data and shop name, etc. are entered correctly.
Marks and their meanings
WARNING : Incorrect handling could cause serious hazard, such as death, serious injury, etc. with a high probability.
CAUTION : Incorrect handling could cause serious hazard depending on the conditions.
WARNING
Do not connect the power cord to an intermediate point, use an extension cord, or connect multiple devices to a single AC outlet. · This may cause overheating, fire, or electric shock.
Make sure the power plug is free of dirt and insert it securely into the outlet. · A dirty plug may cause fire or electric shock.
Do not bundle, pull, damage, or modify the power cord, and do not apply heat or place heavy objects on it. · This may cause fire or electric shock.
Do not turn the breaker OFF/ON or disconnect/connect the power plug during operation. · This may create sparks, which can cause fire. · After the indoor unit is switched OFF with the remote controller,
make sure to turn the breaker OFF or disconnect the power plug.
Do not expose your body directly to cool air for a prolonged length of time. · This could be detrimental to your health.
The unit should not be installed, relocated, disassembled, altered, or repaired by the user. · An improperly handled air conditioner may cause fire, electric
shock, injury, or water leakage, etc. Consult your dealer. · If the power supply cord is damaged, it must be replaced by the
manufacturer or its service agent in order to avoid a hazard.

Meanings of symbols used in this manual
: Be sure not to do.
: Be sure to follow the instruction.
: Never insert your finger or stick, etc.
: Never step onto the indoor/outdoor unit and do not put anything on them.
: Danger of electric shock. Be careful.
: Be sure to disconnect the power supply plug from the power outlet.
: Be sure to shut off the power.
: Risk of fire.
When installing, relocating, or servicing the unit, make sure that no substance other than the specified refrigerant (R32/R410A) enters the refrigerant circuit. · Any presence of foreign substance such as air can cause abnor-
mal pressure rise and may result in explosion or injury. · The use of any refrigerant other than that specified for the system
will cause mechanical failure, system malfunction, or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safety. 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. Do not insert your finger, a stick, or other objects into the air inlet or outlet. · This may cause injury, since the fan inside rotates at high speeds during operation. In case of an abnormal condition (such as a burning smell), stop the air conditioner and disconnect the power plug or turn the breaker OFF. · A continued operation in the abnormal state may cause a malfunction, fire, or electric shock. In this case, consult your dealer.

EN-1

SAFETY PRECAUTIONS
WARNING
When the air conditioner does not cool or heat, there is a possibility of refrigerant leakage. If any refrigerant leakage is found, stop operations and ventilate the room well and consult your dealer immediately. If a repair involves recharging the unit with refrigerant, ask the service technician for details. · The refrigerant used in the air conditioner is not harmful. Normally,
it does not leak. However, if refrigerant leaks and comes in contact with fire or heating part of such a fan heater, kerosene heater, or cooking stove, it will create harmful gas and there is risk of fire.
The user should never attempt to wash the inside of the indoor unit. Should the inside of the unit require cleaning, contact your dealer. · Unsuitable detergent may cause damage to plastic material inside
the unit, which may result in water leakage. Should detergent come in contact with electrical parts or the motor, it will result in a malfunction, smoke, or fire. · 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). · Be aware that refrigerants may not contain an odour. · Do not use means to accelerate the defrosting process or to clean the appliance, other than those recommended by the manufacturer. · Do not pierce or burn.
This unit should be installed in rooms which exceed the floor space specified in outdoor unit installation manual. · Refer to outdoor unit installation manual.
This appliance is intended to be used by expert or trained users in shops, in light industry and on farms, or for commercial use by lay persons.
CAUTION
Do not touch the air inlet or the aluminum fins of the indoor/ outdoor unit. · This may cause injury.
Do not use insecticides or flammable sprays on the unit. · This may cause a fire or deformation of the unit.
Do not expose pets or houseplants to direct airflow. · This may cause injury to the pets or plants.
Do not place other electric appliances or furniture under the indoor/outdoor unit. · Water may drip down from the unit, which may cause damage or
malfunction.
Do not leave the unit on a damaged installation stand. · The unit may fall and cause injury.
Do not step on an unstable bench to operate or clean the unit. · This may cause injury if you fall down.
Do not pull the power cord. · This may cause a portion of the core wire to break, which may
cause overheating or fire.
Do not charge or disassemble the batteries, and do not throw them into a fire. · This may cause the batteries to leak, or cause a fire or explosion.
Do not operate the unit for more than 4 hours at high humidity (80% RH or more) and/or with windows or outside door left open. · This may cause the water condensation in the air conditioner, which
may drip down, wetting or damaging the furniture. · The water condensation in the air conditioner may contribute to
growth of fungi, such as mold.
Do not use the unit for special purposes, such as storing food, raising animals, growing plants, or preserving precision devices or art objects. · This may cause deterioration of quality, or harm to animals and
plants.
Do not expose combustion appliances to direct airflow. · This may cause incomplete combustion.
Never put batteries in your mouth for any reason to avoid accidental ingestion. · Battery ingestion may cause choking and/or poisoning.
Before cleaning the unit, switch it OFF and disconnect the power plug or turn the breaker OFF. · This may cause injury, since the fan inside rotates at high speeds
during operation.
When the unit will be unused for a long time, disconnect the power plug or turn the breaker OFF. · The unit may accumulate dirt, which may cause overheating or fire.
Replace all batteries of the remote controller with new ones of the same type. · Using an old battery together with a new one may cause overheat-
ing, leakage, or explosion.

If the battery fluid comes in contact with your skin or clothes, wash them thoroughly with clean water. · If the battery fluid comes in contact with your eyes, wash them
thoroughly with clean water and immediately seek medical attention. Ensure that the area is well-ventilated when the unit is operated together with a combustion appliance. · Inadequate ventilation may cause oxygen starvation. Turn the breaker OFF when you hear thunder and there is a possibility of a lightning strike. · The unit may be damaged if lightning strikes. After the air conditioner is used for several seasons, perform inspection and maintenance in addition to normal cleaning. · Dirt or dust in the unit may create an unpleasant odor, contribute
to growth of fungi, such as mold, or clog the drain passage, and cause water to leak from the indoor unit. Consult your dealer for inspection and maintenance, which require specialized knowledge and skills. Do not operate switches with wet hands. · This may cause electric shock. Do not clean the air conditioner with water or place an object that contains water, such as a flower vase, on it. · This may cause fire or electric shock. Do not step on or place any object on the outdoor unit. · This may cause injury if you or the object falls down.
IMPORTANT
Dirty filters cause condensation in the air conditioner which will contribute to the growth of fungi such as mold. It is therefore recommended to clean air filters every 2 weeks.
For installation
WARNING
Consult your dealer for installing the air conditioner. · It should not be installed by the user since installation requires
specialized knowledge and skills. An improperly installed air conditioner may cause water leakage, fire, or electric shock.
Provide a dedicated power supply for the air conditioner. · A non-dedicated power supply may cause overheating or fire.
Do not install the unit where flammable gas could leak. · If gas leaks and accumulates around the outdoor unit, it may cause
an explosion.
Earth the unit correctly. · Do not connect the earth wire to a gas pipe, water pipe, lightning
rod, or a telephone earth wire. Improper earthing may cause electric shock.
CAUTION
Install an earth leakage breaker depending on the installation location of the air conditioner (such as highly humid areas). · If an earth leakage breaker is not installed, it may cause electric
shock.
Ensure that the drain water is properly drained. · If the drain passage is improper, water may drip down from the
indoor/outdoor unit, wetting and damaging the furniture.
In case of an abnormal condition Immediately stop operating the air conditioner and consult your dealer.

EN-2

OPERATING INSTRUCTIONS

PREPARATION BEFORE OPERATION

Before operation: Insert the power supply plug into the power outlet and/or turn the breaker on.
Installing the remote controller batteries Setting current time

4. Press RESET.

1. Press CLOCK.

3. Press the DAY button
to set the day.

1. Remove the front lid.

2. Insert the negative
pole of AAA alkaline batteries first.
3. Install the front lid.
Note:
· Make sure the polarity of the batteries is correct. · Do not use manganese batteries and leaking batteries. The remote controller
could malfunction. · Do not use rechargeable batteries. · The battery replacement indicator lights up when the battery is running low.
In about 7 days after the indicator starts lights up, the remote controller stops working. · Replace all batteries with new ones of the same type. · Batteries can be used for approximately 1 year. However, batteries with expired shelf lives last shorter. · Press RESET gently using a thin instrument. If the RESET button is not pressed, the remote controller may not operate correctly.

4. Press CLOCK again.

2. Press either the TIME button
or the TIMER buttons to set the time. Each press increases/decreases the time by 1 minute (10 minutes when pressed longer).

Note:
· Press CLOCK gently using a thin instrument.

EN-3

NAME OF EACH PART

Indoor unit
Air inlet Air outlet

Horizontal vane Vertical vane
Intake grille

Air cleaning filter (Anti-Allergy Enzyme filter, option)
Display section

Air filter (Air purifying filter)

Safety strings

Spec name plate

Open the display cover

Remote controller
Battery replacement indicator Page 3 Operation display section
Temperature buttons Page 5

Signal transmitting section Distance of signal : About 6 m
Beep(s) is (are) heard from
the indoor unit when the
signal is received.

Operation select button Page 5
ECONO COOL button Page 7
VANE control button Page 6
i-save button Page 6
CLOCK button Page 3
Lid Slide the lid down to open the remote controller. Slide it down further to get to the weekly timer buttons.

90°
Operate the remote controller in the area where signal is received, and beep is heard.
OFF/ON (stop/operate) button
FAN speed control button Page 6
WIDE VANE control button Page 6
TIME, TIMER set buttons Page 3, 7 Increase time Decrease time
WEEKLY TIMER set buttons Page 8
RESET button Page 3

Remote
controller holder
· Install the remote controller holder in a place where the signal can be received by the indoor unit.

Only use the remote controller provided with the unit. Do not use other remote controllers. If two or more indoor units are installed in proximity to one another, an indoor unit that is not intended to be operated may respond to the remote controller.

Remote control receiving section

Outdoor unit

Air inlet (back and side)
Refrigerant piping Air outlet

Emergency operation switch Page 5 Operation indicator lamp

Drain outlet Outdoor units may be different in appearance.

EN-4

OPERATING INSTRUCTIONS
SELECTING OPERATION MODES

1 Press

to start the operation.

2 Press

to select operation mode. Each press

changes mode in the following order:

(AUTO) (COOL) (DRY) (HEAT) (FAN)

AUTO mode (Auto changeover)
The unit selects the operation mode according to the difference between the room temperature and the set temperature. During AUTO mode, the unit changes mode (COOLHEAT) when the room temperature is about 2°C away from the set temperature for more than 15 minutes.
Note:
During multi system operation, the unit may not be able to switch operation mode between COOL and HEAT. In this case, the indoor unit becomes standby mode (Refer to table of Operation indicator lamp).
COOL mode
Enjoy cool air at your desired temperature.
Note:
Do not operate COOL mode at low outside temperature (less than -10°C). Water condensed in the unit may drip and wet or damage furniture, etc.
DRY mode
Dehumidify your room. The room may be cooled slightly. Temperature cannot be set during DRY mode.
HEAT mode
Enjoy warm air at your desired temperature.
FAN mode
Circulate the air in your room. Temperature cannot be set during FAN mode.
Note:
After COOL/DRY mode operation, it is recommended to operate in the FAN mode to dry inside the indoor unit.

3

Press

or

to set the temperature.

Each press raises or lowers the temperature by 1°C.

Press

to stop the operation.

Note:
Operation indicator lamp The operation indicator lamp shows the operation state of the unit.

Indication

Operation state

Room temperature

The unit is operating to reach the set About 2°C or more away

temperature

from set temperature

The room temperature is approach- About 1 to 2°C from set

ing the set temperature

temperature

Standby mode (Refer to multi system operation)

—

Lit

Blinking

Not lit

Multi system operation
Two or more indoor units can be operated by one outdoor unit. When several indoor units are operated simultaneously, cooling and heating operations cannot be done at the same time. When COOL is selected with one unit and HEAT with another or vice versa, the unit operated later becomes standby mode.
Water may condense when HEAT is operated with other units within 3 hours after COOL/DRY operation is stopped. To prevent water condensation, perform HEAT with temperature set to 16°C for about 30 minutes after COOL/DRY operation.

Emergency operation
When the remote controller cannot be used…
Emergency operation can be activated by pressing the emergency operation switch (E.O.SW) on the indoor unit.
Each time the E.O.SW is pressed, the operation changes in the following order:
Operation indicator lamp

Emergency COOL

Emergency HEAT Stop

Set temperature : 24°C Fan speed : Medium Horizontal vane : Auto

Note:
The first 30 minutes of operation is test run. Temperature control does not work, and fan speed is set to High.

Auto restart function
If a power failure occurs or the main power is turned off during operation, “Auto restart function” automatically starts operation in the same mode as the one set with the remote controller just before the shutoff of the main power. When timer is set, timer setting is cancelled and the unit starts operation when power is resumed.
If you do not want to use this function, please consult the service representative because the setting of the unit needs to be changed.

EN-5

FAN SPEED AND AIRFLOW
DIRECTION ADJUSTMENT

I-SAVE OPERATION

Press

to select fan speed. Each press changes

fan speed in the following order:

(AUTO)

(Quiet)

(Low)

(Med.)

(High)

· Two short beeps are heard from the indoor unit when set to AUTO.

Press

to select airflow direction. Each press

changes airflow direction in the following order:

(AUTO) (1)

(2)

(3)

(4)

(5) (SWING)

· Two short beeps are heard from the indoor unit when set to AUTO.

Airflow direction
(AUTO)………The vane is set to the most efficient airflow direction. COOL/ DRY: horizontal position. HEAT: downward position.
(Manual) …….For efficient air conditioning, select upper position for COOL/ DRY, and lower position for HEAT.
(Swing) ………The vane moves up and down intermittently.

Press

to change horizontal airflow direction.

· The vertical vane moves for about 30 seconds.

· After 30 seconds, the vertical vane moves to its original position. In

this case, press

again.

Press

again to set horizontal airflow direction.

· The vertical vane stops and the airflow direction is set.

1 Press

during COOL, or HEAT mode to select

i-save mode.

2 Set the temperature, fan speed and airflow direction. · The same setting is selected from the next time by simply pressing .
· Two settings can be saved. (One for COOL, one for HEAT)
· Select the appropriate temperature, fan speed and airflow direction according to your room.

Press

again to cancel i-save operation.

· i-save operation also is cancelled when the MODE button is pressed.

i-save operation

· A simplified set back function enables to recall the preferred (preset) setting

with a single push of the

button. Press the button again and you can go

back to the previous setting in an instance.

· i-save operation cannot be set on the weekly timer.

Example of use:
1. Low energy mode Set the temperature 2°C to 3°C warmer in COOL and cooler in HEAT mode. This setting is suitable for unoccupied room, and while you are sleeping.
2. Saving frequently used settings Save your preferred setting for COOL and HEAT. This enables you to select your preferred setting with a single push of the button.

EN-6

OPERATING INSTRUCTIONS
ECONO COOL OPERATION

Press

during COOL mode page 5 to start

ECONO COOL operation.

The unit performs swing operation vertically in various cycle according

to the temperature of the unit. Set temperature is set 2°C higher auto-

matically.

Press
· Pressing

again to cancel ECONO COOL operation.
also cancels ECONO COOL operation.

What is “ECONO COOL”?
Swing airflow (change of air flow) makes you feel cooler than stationary airflow. The set temperature and the airflow direction are automatically changed by the microprocessor. It is possible to perform cooling operation with keeping comfort. As a result energy can be saved.

TIMER OPERATION (ON/OFF TIMER)

1

Press

or

(ON timer) :

during operation to set the timer. The unit turns ON at the set time.

(OFF timer) : The unit turns OFF at the set time.

• or blinks. * Make sure that the current time and day are set correctly. Page 3

2 Press

(Increase) and

(Decrease) to set the

time of timer.

Each press increases or decreases the set time by 10 minutes.

· Set the timer while

or

is blinking.

3 Press

or

again to cancel timer.

Note:
· ON and OFF timers can be set together. mark indicates the order of timer operations.
· If power failure occurs while ON/OFF timer is set, see page 5 “Auto restart function”.
EN-7

WEEKLY TIMER OPERATION

· A maximum of 4 ON or OFF timers can be set for individual days of the week. · A maximum of 28 ON or OFF timers can be set for a week.

E.g. : Runs at 24°C from waking up to leaving home, and runs at 27°C from getting home to going to bed on weekdays.
Runs at 27°C from waking up late to going bed early on weekends.

Mon Setting1 ON

Setting2 OFF

~

24°C

Fri

6:00

8:30

Setting3 ON
17:30

27°C

Setting4 OFF
22:00

Sat

Setting1

ON

~

27°C

Sun

8:00

Setting2 OFF
21:00

Note:
The simple ON/OFF timer setting is available while the weekly timer is on. In this case, the ON/OFF timer has priority over the weekly timer; the weekly timer operation will start again after the simple ON/OFF timer is complete.

Setting the weekly timer

• Make sure that the current time and day are set correctly.

1 Press

to enter the weekly timer setting mode.

blinks.

3

Press

,

temperature.

, and

to set ON/OFF, time, and
E.g. : [ON], [6:00] and [24°C] are selected.

Pressing selects ON/OFF timer.

Pressing

Pressing

Pressing deletes timer setting.

adjusts the time.

adjusts the temperature.

• Hold down the button to change the time quickly. * The temperature can be set between 16°C and 31°C at weekly timer.

Press

and

to continue setting the timer for

other days and/or numbers.

4 Press setting.

to complete and transmit the weekly timer

which was blink-

ing goes out, and the

current time will be

displayed.

Note:

· Press

to transmit the setting information of weekly timer to the indoor

unit. Point the remote controller toward the indoor unit for 3 seconds.

· When setting the timer for more than one day of the week or one number,

does not have to be pressed per each setting. Press

once after

all the settings are complete. All the weekly timer settings will be saved.

· Press

to enter the weekly timer setting mode, and press and hold

for 5 seconds to erase all weekly timer settings. Point the remote

controller toward the indoor unit.

5 Press

to turn the weekly timer ON. (

lights.)

• When the weekly timer is ON, the day of the week whose timer setting is complete, will light.

Press again to turn the weekly timer OFF. ( goes out.)
Note:
The saved settings will not be cleared when the weekly timer is turned OFF.

2

Press

and

to select setting day and number.

E.g. : [Mon Tue … Sun] and [1] are selected.

Pressing

selects the day of

the week to be set.

Pressing

selects

the setting number.

Checking weekly timer setting

1 Press

to enter the weekly timer setting mode.

blinks.

2 Press

or

day or number.

to view the setting of the particular

Press

to exit the weekly timer setting.

• All days can be selected.

EN-8

OPERATING INSTRUCTIONS

CLEANING

Instructions:
· Switch off the power supply or turn off the breaker before cleaning. · Be careful not to touch the metal parts with your hands. · Do not use benzine, thinner, polishing powder, or insecticide. · Use only diluted mild detergents.

Open
1. Press the tabs on the intake grille.

Tab

· Do not expose parts to direct sunlight, heat, or flames to dry. · Do not use water hotter than 50°C. · Do not use a scrubbing brush, a hard sponge, or the like. · Do not soak or rinse the horizontal vane.
Close
1. Close the intake grille. · Make sure that the safety strings do not hang out of the intake grille.
2. Press around the each tab of the intake grille until a “click” is heard and press the center.
Around tab

2. Open the intake grille while holding it.

EN-9

CLEANING

Air filter (Air purifying filter)
· Clean every 2 weeks · Remove dirt by a vacuum cleaner, or rinse with water. · Dry it well in shade before installing it.
Install the tabs into the intake grille hole.

Intake grille
1. Slide the shafts and unhook the safety strings to remove. · Wipe with a soft dry cloth, or wash it with water using soft cloth, sponge, etc. · Do not soak it in water for more than two hours. · Dry it well in shade before installing it.
Hook Safety strings

Air cleaning filter
(Anti-Allergy Enzyme filter, option)
Back side of air filter
Clean every 3 months: · Remove dirt by a vacuum cleaner. When dirt cannot be removed by vacuum cleaning: · Soak the filter and its frame in lukewarm water before rinsing it.
(Diluted mild detergents can be used when dirt cannot be removed.) · After washing, dry it well in shade. Every year: · Replace it with a new air cleaning filter for best performance. · Parts Number MAC-408FT-E

2. Install the intake grille by following the removal procedure in reverse.
WARNING Make sure to hook the safety string of the intake grille. Not doing so may cause injury due to the intake grille falling.

Important
· Clean the filters regularly for best performance and to reduce power consumption.
· Dirty filters cause condensation in the air conditioner which will contribute to the growth of fungi such as mold. It is therefore recommended to clean air filters every 2 weeks.

EN-10

OPERATING INSTRUCTIONS
WHEN YOU THINK THAT TROUBLE HAS OCCURRED

Even if these items are checked, when the unit does not recover from the trouble, stop using the air conditioner and consult your dealer.

Symptom

Explanation & Check points

Indoor Unit

The unit cannot be operated. · Is the breaker turned on? · Is the ON timer set? Page7

The unit cannot be operated for about 3 minutes when restarted.

· This protects the unit according to instructions from the microprocessor. Please wait.

Mist is discharged from the air · The cool air from the unit rapidly cools mois-

outlet of the indoor unit.

ture in the air inside the room, and it turns

into mist.

The swing operation of the HORIZONTAL VANE is suspended for a while, then restarted.

· This is for the swing operation of the HORIZONTAL VANE to be performed normally.

The air flow direction changes during operation. The direction of the horizontal vane cannot be adjusted with the remote controller.

· In the heating operation, if the air flow temperature is too low or when defrosting is being done, the horizontal vane is automatically set to horizontal position.

The operation is stopped for about 10 minutes in the heating operation.

· Defrosting of the outdoor unit is being done. Since this is completed in max.10 minutes, please wait. (When the outside temperature is too low and humidity is too high, frost is formed.)

The unit starts operation by itself when the main power is turned on, though it isn’t operated with the remote controller.

· These models are equipped with an auto restart function. When the main power is turned off without stopping the unit with the remote controller and is turned on again, the unit starts operation automatically in the same mode as the one set with the remote controller just before the shutoff of the main power. Refer to “Auto restart function”. Page 5

The indoor unit which is not · A small amount of refrigerant continues to operating becomes warm and flow into the indoor unit even though it is not a sound, similar to water flow- operating. ing, is heard from the unit.

The indoor unit discolors over time.

· Although plastic turns yellow due to the influence of some factors such as ultraviolet light and temperature, this has no effect on the product functions.

Outdoor Unit (Multi system)

When heating operation is selected, operation does not start right away.

· When operation is started during defrosting of outdoor unit is done, it takes a few minutes (max. 10 minutes) to blow out warm air.

The fan of the outdoor unit · When the outside temperature is low during

does not rotate even though cooling operation, the fan operates intermit-

the compressor is running.

tently to maintain sufficient cooling capacity.

Even if the fan starts to rotate,

it stops soon.

Water leaks from the outdoor unit.

· During COOL and DRY operations, pipe or pipe connecting sections are cooled and this causes water to condense.
· In the heating operation, water condensed on the heat exchanger drips down.
· In the heating operation, the defrosting operation makes water frozen on the outdoor unit melt and drip down.

White smoke is discharged from the outdoor unit.

· In the heating operation, vapor generated by the defrosting operation looks like white smoke.

Remote controller

The display on the remote controller does not appear or it is dim. The indoor unit does not respond to the remote control signal.

· Are the batteries exhausted? Page 3 · Is the polarity (+, -) of the batteries correct?
Page 3 · Are any buttons on the remote controller of
other electric appliances being pressed?

Does not cool or heat

The room cannot be cooled or · Is the temperature setting appropriate?

heated sufficiently.

Page 5

· Is the fan setting appropriate? Please

change fan speed to Med. or High.

· Is the filter clean? Page 9, 10

· Is the fan or heat exchanger of the indoor

unit clean? Page 9, 10

· Are there any obstacles blocking the air inlet

or outlet of the indoor or outdoor unit?

· Is a window or door open?

· It may take a certain time to reach the setting

temperature or may not reach that depend-

ing on the size of the room, the ambient

temperature, and the like.

EN-11

Symptom

Explanation & Check points

Does not cool or heat

The room cannot be cooled sufficiently.

· When a ventilation fan or a gas cooker is used in a room, the cooling load increases, resulting in an insufficient cooling effect.
· When the outside temperature is high, the cooling effect may not be sufficient.

The room cannot be heated · When the outside temperature is low, the

sufficiently.

heating effect may not be sufficient.

Air does not blow out soon in · Please wait as the unit is preparing to blow

the heating operation.

out warm air.

Airflow

The air from the indoor unit smells strange.

· Is the filter clean? Page 9, 10 · Is the fan or heat exchanger of the indoor unit
clean? Page 9, 10 · The unit may suck in an odor adhering to the
wall, carpet, furniture, cloth, etc. and blow it out with the air.

Sound

Cracking sound is heard.

· This sound is generated by the expansion/ contraction of the intake grille, etc. due to change in temperature.

The sound as burbling is heard.

· This sound is heard when the outside air is absorbed from the drain hose by turning on the range hood or the ventilation fan, making water flowing in the drain hose to spout out. This sound is also heard when the outside air blows into the drain hose in case the outside wind is strong.

Burbling sound is heard from · This is the sound of drained water flowing

the indoor unit when DRY/

backward in the drain piping in the ceiling.

COOL operation is stopped.

Mechanical sound is heard · This is the switching sound in turning on/off

from the indoor unit.

the fan or the compressor.

The sound of water flowing · This is the sound of refrigerant or condensed

is heard.

water flowing in the unit.

Hissing sound is sometimes · This is the sound when the flow of refrigerant

heard.

inside the unit is switched.

The sound of motor and swirling sound is heard from the indoor unit.

· This is the sound of water condensed during COOL/DRY operation being drained from the indoor unit.
· Sound of water draining may also be heard from indoor units which are not operating. (The sound will stop automatically. Please wait.)

Timer

Weekly timer does not operate according to settings.

· Is the ON/OFF timer set? Page 7 · Transmit the setting information of the weekly
timer to the indoor unit again. When the information is successfully received, a long beep will sound from the indoor unit. If information fails to be received, 3 short beeps will be heard. Ensure information is successfully received. Page 8 · When a power failure occurs and the main power turns off, the indoor unit built-in clock will be incorrect. As a result, the weekly timer may not work normally. Be sure to place the remote controller where the signal can be received by the indoor unit. Page 4

The unit starts/stops the operation by itself.

· Is the weekly timer set? Page 8

Dirt

The ceiling and wall around the indoor unit get dirty.

· Please clean the periphery of the air conditioner frequently.
· It may prevent the dirt to lower the wind blowing to the ceiling by adjusting the vertical wind direction.

In the following cases, stop using the air conditioner and consult your
dealer.
· When water leaks or drips from the indoor unit. · When the upper operation indicator lamp blinks. · When the breaker trips frequently. · The remote control signal is not received in a room where an electronic ON/
OFF type fluorescent lamp (inverter-type fluorescent lamp, etc.) is used. · Operation of the air conditioner interferes with radio or TV reception. An ampli-
fier may be required for the affected device. · When an abnormal sound is heard. · When any refrigerant leakage is found.

WHEN THE AIR CONDITIONER IS NOT
GOING TO BE USED FOR A LONG TIME

1 Operate by COOL mode with the highest temperature
set or FAN mode for 3 to 4 hours. Page 5
This dries the inside of the unit.

2 Press

to stop the operation.

3 Turn off the breaker and/or disconnect the power supply plug.

4 Remove all batteries from the remote controller.

When using the air conditioner again:
1 Clean the air filter. Page 9, 10
2 Check that the air inlet and outlet of the indoor and outdoor units are not blocked.
3 Check that the earth is connected correctly.
4 Refer to the “PREPARATION BEFORE OPERATION”, and follow the instructions. Page 3

INSTALLATION PLACE AND
ELECTRICAL WORK

Installation place
Avoid installing the air conditioner in the following places.
· Where there is much machine oil. · Salty places such as the seaside. · Where sulfide gas is generated such as hot spring, sewage, waste water. · Where oil is splashed or where the area is filled with oily smoke (such as cook-
ing areas and factories, in which the properties of plastic could be changed and damaged). · Where there is high-frequency or wireless equipment. · Where the air from the outdoor unit air outlet is blocked. · Where the operation sound or air from the outdoor unit bothers the house next door. · The mounting height of indoor unit 2.2 m is recommended. If it is impossible, please consult your dealer. · Do not operate the air conditioner during interior construction and finishing work, or while waxing the floor. Before operating the air conditioner, ventilate the room well after such work is performed. Otherwise, it may cause volatile elements to adhere inside the air conditioner, resulting in water leakage or scattering of dew.

The installation location of the outdoor

unit should be at least 3 m away from

the antennas for TV sets, radios, etc. In

areas where the reception is weak, pro-

vide greater space between the outdoor

unit and the antenna of the affected

Inverter-type

device if operation of the air conditioner

To prevent the effects fluorescent lamp interferes with radio or TV reception.

of a fluorescent lamp,

keep as far apart as possible.

For the optimum efficiency and to extend the life time of using,

wall, etc.

the outdoor unit

should be installed in

Keep a space a well-ventilated dry

to prevent

place.

the picture

1 m or more Cordless phone or

1 m or more

distortion or the noise.
TV

100 mm or more

500 mm or more

Portable

phone Radio

3 m or more

Electrical work
· Provide an exclusive circuit for the power supply of the air conditioner.
· Be sure to observe the breaker capacity.

If you have any questions, consult your dealer.

SPECIFICATIONS

Guaranteed operating range

Cooling Heating

Upper limit Lower limit Upper limit Lower limit

Indoor
32°C DB 23°C WB
21°C DB 15°C WB
27°C DB —
20°C DB —

Outdoor
*Note 1.
DB: Dry Bulb WB: Wet Bulb

Note:
1. MLZ-KP has no specifications for single combination. This indoor model is only for multi system air conditioner. As for the specifications of multi system, please confirm your dealer and/or refer to the catalogue.

EN-12

HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
RG79Y943H01

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