MITSUBISHI ELECTRIC MSZ-GS24NA-U1 GS-Series Wall Mounted Unit Instruction Manual

SPLIT-TYPE AIR CONDITIONERS INDOOR UNIT
MSZ-GS24NA
MSY-GS24NA

OPERATING INSTRUCTIONS

For user

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

SAFETY PRECAUTIONS

• 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 date 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.
Meanings of symbols used in this manual

|  : Be sure not to do.
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 : Be sure to follow the instruction.
 : Never insert your fi nger or stick, etc.
 : Never step onto the indoor/outdoor unit and do not put anythingon  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.

**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, fi re, or electric shock.
---|---
Make sure the power plug is free of dirt and insert it securely into the outlet.
•A dirty plug may cause fi re or electric shock.
Do not bundle, pull, or modify the power cord, and do not apply heat or place heavy objects on it.
• This may cause fi re 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, electricshock, 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 hazard.
When installing, relocating, or servicing the unit, make sure that no substance other than the specified refrigerant (R410A) enters the refrigerant circuit.
• Any presence of foreign substance such as air can cause abnormal 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 fi nger, 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, fi re, or electric shock. In this case, consult your dealer.
| When the air conditioner does not cool or heat, there is a possibility of refrigerant leakage. In this case, consult your dealer. If a repair involves recharging the unit with refrigerant, ask the service technician for details.
• The refrigerant used in the air conditioner is safe. Normally, it does not leak. However, if refrigerant leaks and comes in contact with a heat source such as a fan heater, kerosene heater, or cooking stove, it will create a harmful gas.
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.

CAUTION

| Do not touch the air inlet or the aluminum fi ns of the indoor/outdoor unit.
•This may cause injury.
---|---
Do not use insecticides or fl ammable sprays on the unit.
• This may cause a fire or deformation of the unit.
Do not expose pets or houseplants to direct airfl ow.
• 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 afire 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 causeoverheating, 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 fi re 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 2weeks.
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, fi re, or electric shock.
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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 fl ammable gas could leak.
• If gas leaks and accumulates around the unit, it may cause an explosion.
| Ground the unit correctly.
• Do not connect the ground wire to a gas pipe, water pipe, lightning rod, or a telephone ground wire. Improper grounding may cause electric shock.

CAUTION

| Please follow applicable federal, state, or local codes to prevent potential leakage/electric shock. Or install a ground fault  interrupt for the prevention of leakage and electric shock.
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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.

NAME OF EACH PART

Indoor unit

Outdoor unit

Outdoor units may be different in appearance.
Remote controller

Remote controller holder

• Install the remote controller holder in a place where the signal can be received by the indoor unit.
• When the remote controller is not used, place it in this holder.

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.

• The backlight turns on when using the remote controller.
  The backlight goes off if the remote controller is not used for a while.
  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

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.

Setting current time

Note:

• Press CLOCK gently using a thin instrument.

Changing temperature units (°F→°C)
Unit is preset with °F.

1. Press RESET while the temperature buttons are pressed.

Note:

• Press RESET gently using a thin instrument.
• To change temperature unit from °C to °F, press RESET.

SELECTING OPERATION MODES <for MSZ (Heat pump)>

1. Press  to start the operation.
2. Press to select operation mode. Each press changes mode in the following order:
3. Press or to set the temperature. Each press raises or lowers the temperature by 1°F (1°C).
   Press to stop the operation.
   • The same setting is selected the next time by simply pressing.

Note:
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 selected last goes into standby mode.
Note:
Operation indicator lamp
The operation indicator lamp shows the operation state of the unit.

away from set temperature
| The room temperature is approach- the set temperature| About 2 to 4°F (1 to 2°C) from set tem- perature
| Standby mode (only during multi system operation)|

Lit Blinking Not lit

AUTO mode (Auto change over)
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 (COOL↔HEAT) when the room temperature is 4°F (2°C) away from the set temperature for more than 15 minutes.
Note:
Auto Mode is not recommended if this indoor unit is connected to a MXZ type outdoor unit. When several indoor units are operated simultaneously, 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 very low outside temperatures. (less than 14°F [-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.
Note:
When the fan speed is set to AUTO, the unit will dehumidify while controlling the fan speed. Depending on the environment, the fan speed may change periodically or the fan may stop.
HEAT mode
Enjoy warm air at your desired temperature.

SELECTING OPERATION MODES <for MSY (Cooling only)>

1. Press to start the operation.
2. Press to select operation mode. Each press changes mode in the following order:
3. Press or to set the temperature. Each press raises or lowers the temperature by 1°F (1°C).
   Press to stop the operation.
   • The same setting is selected the next time by simply pressing.

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

away from set temperature
| The room temperature is approaching the set temperature| About 2 to 4°F (1 to 2°C) from set temperature

Lit Not lit

I FEEL mode
The unit selects the operation mode according to the room temperature when I FEEL is selected. When the room temperature is higher than 77°F (25°C), COOL is selected (set temperature: 75°F [24°C]). When the room temperature is lower than 77°F (25°C), DRY is selected. However, when operation is stopped and then started within 2 hours, the mode which has been selected previously is operated.
Note:
During COOL operation, the set temperature may not be changed when the room temperature is more than 4°F (2°C) higher than the set temperature. In this case, please wait until the room temperature drops to within 4°F (2°C) of the set temperature.
COOL mode
Enjoy cool air at your desired temperature.
Note:
Do not operate COOL mode at very low outside temperatures. (less than 14°F [-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.
Note:
When the fan speed is set to AUTO, the unit will dehumidify while controlling the fan speed. Depending on the environment, the fan speed may change periodically or the fan may stop.
FAN mode
Circulate the air in your room.

FAN SPEED AND AIRFLOW DIRECTION ADJUSTMENT

Fan speed

1. Press to select fan speed. Each press changes fan speed in the following order:• Two short beeps are heard from the indoor unit when set to AUTO.
   • Use higher fan speed to cool/heat the room quicker. It is recommended to lower the fan speed once the room is cool/warm.
   • Use lower fan speed for quiet operation.

Note:
Multi system operation
When several indoor units are operated simultaneously for heating operation, the temperature of the airfl ow may be low. In this case, it is recommended to set the fan speed to AUTO.
Up-down Airflow direction

1. Press to select airflow direction. Each press changes airfl ow direction in the following order: (AUTO) ………The vane is set to the most effi cient airfl ow direction. COOL/ DRY/FAN: horizontal position. HEAT: position (4).
   (Manual) …….For efficient air conditioning, select the upward position for COOL/DRY, and the downward position for HEAT/FAN. If the position (4) or (5) is selected during COOL/DRY, the vane automatically moves to the upward position after 0.5 to 1 hour to prevent any condensation from dripping.
   (Swing) ………The vane moves up and down intermittently.
   • Two short beeps are heard from the indoor unit when set to AUTO.

Left-right Airflow direction

1. Press to select horizontal airflow direction. Each press changes airflow direction in the following order:

ECONO COOL OPERATION

Swing air flow (change of air fl ow) makes you feel cooler than constant air fl ow.
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.

1. Press during COOL mode Pages 5, 6 to start ECONO COOL operation.
   The unit performs swing operation vertically in various cycles according to the temperature airflow.
   Press again to cancel ECONO COOL operation.
   • ECONO COOL operation also is cancelled when the VANE or POWERFUL button is pressed.

POWERFUL OPERATION

1. Press during COOL or HEAT mode Pages 5, 6 to start POWERFUL operation.
   Fan speed : Exclusive speed for POWERFUL mode
   Horizontal vane : The vane follows as your selection during Manual/ Swing.
   Downward position during AUTO operation.
   • Temperature cannot be set during POWERFUL operation.
   Press again to cancel POWERFUL operation.
   • POWERFUL operation also is cancelled automatically in 15 minutes, or when the OFF/ON, FAN, or ECONO COOL button is pressed.

SMART SET 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.

1. Press during COOL, or HEAT mode to select SMART SET mode.
2. Set the temperature, fan speed, and airfl ow 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 SMART SET operation.
   • SMART SET operation also is cancelled when the MODE button is pressed.

Note:
Example of use:

1. Low energy mode
   Set the temperature 4°F (2°C) to 6°F (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.

TIMER OPERATION (ON/OFF TIMER)

1. Press or during operation to set the timer.
    (ON timer) : The unit will turn ON at the set time.
   (OFF timer) : The unit will turn OFF at the set time. * or blinks.

• Make sure that the current time is set correctly. Page 4 2. Press (forward) and (backward) to set the time of timer.
  Each press changes the set time 10 minutes forward/backward.
  • Set the timer while or is blinking. 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 11 “Auto restart function”.

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.

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.
  2. Press and to select setting day and number.
  3. Press , , and to set ON/OFF, time, and temperature.* Hold down the button to change the time quickly.

• The temperature can be set between 61°F and 88°F (16°C and 31°C) at weekly timer.
  Press and to continue setting the timer for other days and/or numbers.

  4. Press to complete and transmit the weekly timer setting. * 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.

  6. Put the remote controller in places where its signal always reaches the indoor unit.
     • The signal is transmitted from the remote controller at the set time.
     • If the indoor unit cannot receive the signal at this time, it does not operate according to the setting on the weekly timer. Therefore, note the position of the remote controller.

Checking weekly timer setting

1. Press to enter the weekly timer setting mode. * blinks.
2. Press or **** to view the setting of the particular day or number.
   Press to exit the weekly timer setting.

Note:
When all days of the week are selected to view the settings and a different setting is included among them, will be displayed.

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:

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.

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.
• When dirt stands out, wash it with kitchen neutral detergent diluted with lukewarm water to the specified concentration, then wipe off the detergent with a damp towel.
• Do not use a scrubbing brush, a hard sponge, or the like.
• Do not soak or rinse the horizontal vane.
• Do not use water hotter than 50°C.
• Do not expose parts to direct sunlight, heat, or fi re to dry.
• Do not apply excessive force on the fan as it may cause cracks or breakage.

What is “Nano platinum fi lter”?
Nano platinum is a ceramic particle that includes a platinum nanoparticle.
The particles are incorporated into the filter material, which results in providing semi-permanent antibacterial and deodorizing characteristics for the filter Nano platinum surpasses the catechin (a biofl avonoid that is found in green tea) in performance. Nano platinum fi lter uses this compound not only to improve air quality but also to eliminate bacteria and viruses. This air filter has a semi-permanent lasting effect even after washing it with water.

Front panel

1. Lift the front panel until a “click” is heard.

2. Hold the hinges and pull to remove as shown in the left illustration.
   • Wipe with a soft dry cloth or rinse it with water.
   • Do not soak it in water for more than two hours.
   • Dry it well in shade.

3. Install the front panel by following the removal procedure in reverse. Close the front panel securely and press the positions indicated by the arrows.

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.

• After washing, dry it well in shade.
  Every year:

• Replace it with a new air cleaning filter for best performance.

• Parts Number MAC-2310FT-E

(Microparticle catching fi lter, option)
Removes the microparticles from the air by means of static electricity. Back side of air filter
Clean every 3 months:

• Remove dirt by a vacuum cleaner.
• Put it back to its original position, and install all tabs of the air cleaning filter.
• Do not wash it with water. Replace it with a new air cleaning filter when tobacco tar or oil stains adhere to it.

Every 3 year:

• Replace it with a new air cleaning fi lter for best performance.
• Parts Number MAC-EMF615FT-E

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.

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 power supply plug connected?
•Is the ON timer set? Page 9
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 outlet of the indoor unit.| •The cool air from the unit rapidly cools moisture in the air inside the room, and it turns into mist.
The swing operation of the HORIZONTAL / VERTICAL VANE is suspended for a while, then restarted.| •This is for the swing operation of the HORIZONTAL / VERTICAL 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.| •When the unit is operated in COOL or DRY mode, if the operation continues with air blowing down for 0.5 to 1 hour, the direction of the air flow is automatically set to upward position to prevent water from condensing and dripping.
•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 stops for about 10 minutes in the heating operation.| •Outdoor unit is in defrost.
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 re-start 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 11
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.
Multi system
The indoor unit which is not operating becomes warm and a sound, similar to water flow- ing, is heard from the unit.| •A small amount of refrigerant continues to flow into the indoor unit even though it is not operating.
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.
Outdoor Unit
The fan of the outdoor unit does not rotate even though the compressor is running. Even if the fan starts to rotate, it stops soon.| •When the outside temperature is low during cooling operation, the fan operates intermit-tently to maintain sufficient cooling capacity.
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 ice forming 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.
Symptom Explanation & Check points
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 4
•Is the polarity (+, -) of the batteries correct?
Page 4
•Are any buttons on the remote controller of
other electric appliances being pressed?
Does not cool or heat
The room cannot be cooled or heated sufficiently.| •Is the temperature setting appropriate?
Pages 5, 6
•Is the fan setting appropriate? Please change
fan speed to High or Super High. Page 7
•Are the filters clean? Page 12
•Is the fan or heat exchanger of the indoor unit clean?
•Are there any obstacles blocking the air inlet or outlet of the indoor or outdoor unit?
•Is a window or door open?
•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.
•It may take a certain time to reach the setting temperature or may not reach that depending on the size of the room, the ambient temperature, and the like.
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 sufficiently.| •When the outside temperature is low, the heating effect may not be sufficient.
Air does not blow out soon in the heating operation.| •Please wait as the unit is preparing to blow out warm air.
Airflow
The air from the indoor unit smells strange.|
•Are the filters clean? Page 12
•Is the fan or heat exchanger of the indoor unit clean?
•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 front panel, etc. due to change in temperature.
“Burbling” sound 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.
Mechanical sound is heard from the indoor unit.| •This is the switching sound in turning on/off the fan or the compressor.
The sound of water flowing is heard.| •This is the sound of refrigerant or condensed water flowing in the unit.
Hissing sound is sometimes heard.| •This is the sound when the flow of refrigerant inside the unit is switched.
Timer
Weekly timer does not operate according to settings.|
•Is the ON/OFF timer set? Pages 9, 10
•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.
Pages 9, 10
•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 3
The unit starts/stops the opera- tion by itself.| •Is the weekly timer set? Pages 9, 10

In the following cases, stop using the air conditioner and consult your dealer.

• When water leaks or drips from the indoor unit.

• When the left/upper operation indicator lamp blinks. (For Multi system, except for when the lamp of a multi unit blinks while the unit is on standby.)

• 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 fl uorescent lamp, etc.) is used.

• Operation of the air conditioner interferes with radio or TV reception. An amplifier may be required for the affected device.

• When an abnormal sound is heard.
  In normal operation there could be intermittent operational noises heard from the indoor unit. If the noise becomes constant or increasingly disturbing, please consult with the installer for additional guidance and information.

• When any refrigerant leakage is found.

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

1. Set to the highest temperature in manual COOL mode, and operate for 3 to 4 hours. Pages 5, 6
   • This dries the inside of the unit.
   • Moisture in the air conditioner contributes to favorable conditions for growth of fungi, such as mold.

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 filters. Page 12
2. Check that the air inlet and outlet of the indoor and outdoor units are not blocked.
3. Check that the ground wire is connected correctly.
4. Refer to the “PREPARATION BEFORE OPERATION”, and follow the instructions. Page 4

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 cooking 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 5.9 ft. to 7.5 ft. (1.8 m to 2.3 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 fl oor. 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.

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

| Indoor| Outdoor
---|---|---
MUZ-GS24NA(H)
MUY-GS24NA| MUZ-GS24NAHZ
Cooling| Upper limit| 90°F (32.2°C) DB| 115 F (46.1 C) DB
73°F (22.8°C) WB| —
Lower limit| 67°F (19.4°C) DB| 14°F (-10°C) DB
57°F (13.9°C) WB|
—
Heating
(for MSZ/MUZ)| Upper limit| 80°F (26.7°C) DB| 75°F (23.9°C) DB
—| 65°F (18 3°C) WB
Lower limit| 70°F (21.1°C) DB| -4°F (-20°C) DB| -13°F (-25°C) DB
—| -5°F (-20.6°C) WB| -14°F (-25.6°C) WB

DB : Dry Bulb
WB : Wet Bulb

Note:

1. The guaranteed operating range value is for 1:1 System Application.
2. If the outdoor temperature is below the lower limit of guaranteed operating range, the outdoor unit may stop operation until the outdoor temperature exceeds the lower limit.

For the residents of USA

U.S. Product Warranty and Registration Information
Congratulations on the purchase of your new Mitsubishi Electric Trane HVAC US Cooling & Heating system and thank you for trusting us with your personal comfort.
Your installing contractor may have registered your products on your behalf. To check the registration status or to complete your product registration, please visit us at http://www.metahvac.com/.
Be sure to have the model and serial number for each of your indoor and outdoor units ready before starting the registration process.
If you need assistance registering your products, call or write to us at:

Mitsubishi Electric Trane HVAC US LLC
ATTN: Customer Care Center
1340 Satellite Boulevard
Suwanee, GA 30024
Phone: 1.800.433.4822
E-mail: CustomerCare@hvac.mea.com

For the residents of Canada
Mitsubishi Electric
HVAC Warranty Registration (Canada)
Congratulations on the purchase of your new Mitsubishi Electric heat pump or air conditioning system.
In order to benefit from our extended warranty, your installing contractor must register your system’s products on our website on your behalf within 90 days of installation. The extended warranty covers the system’s parts and compressor for an extended period from the date of installation. Product model and serial numbers are required for online registration.
To register, please ask your installing contractor to visit the warranty registration page at www.mitsubishielectricmeq.ca, complete the registration and provide you with confirmation of registration.
PLEASE NOTE: Regular maintenance as specified in the owner’s manual is essential to your system performing according to manufacturer specifications over the applicable warranty period. Please review the terms of the product warranty at mitsubishielectric.ca
If you require assistance, please contact: info@mitsubishielectric.ca

HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
DG79A05EH01

References

• MITSUBISHI ELECTRIC Global website
• Welcome | MESCA
• Mitsubishi Electric Trane US HVAC | Home

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