MITSUBISHI ELECTRIC MS-GA50VB (01) PDF MANUAL

WARNINGS:

• Do not use an intermediate connection of the power supply cord or an extension cord, and do not connect many devices to one AC outlet to prevent fire or electric shock.

• Remove dirt from the power supply plug and insert it securely into the outlet. Incomplete insertion may cause fire or electric shock.

• Do not scratch or process the power supply cord. Putting heavy objects on the cord or damaging it can lead to fire or electric shock.

• Do not turn the breaker on/off or connect/disconnect the power supply plug during operation. Always switch the unit off with the remote controller first.

• Do not expose your skin directly to cool air for a long time as this could damage your health.

• Do not insert your finger or any object into the air inlet/outlet, as the fan rotates at high speed and can cause injury.

• If an abnormality like a burning smell occurs, stop the air conditioner, disconnect the power supply plug, and/or turn off the breaker. Consult your dealer.

• Installation, repairs, or relocation should not be done by the customer. If done incorrectly, it may cause fire, electric shock, or injury. If the power supply cord is damaged, it must be replaced by the manufacturer or its service agent.

CAUTIONS:

• When removing the air filter, do not touch the metal parts of the indoor unit to avoid injury.

• Do not use insecticides or flammable sprays on the unit.

• Do not place pets or houseplants in the path of direct airflow.

• Do not place other electric appliances or furniture under the indoor/outdoor unit, as dripping water may cause damage or malfunction.

• Do not operate the unit for a long time in high humidity (80% RH or more) with a door or window open, as condensed water may drop and damage furniture.

• Do not use the unit for special purposes, such as preserving food, animals, or art objects, as this may cause deterioration of quality.

• When cleaning the unit, switch it off and disconnect the power supply plug or turn off the breaker.

• Do not operate switches with wet hands to avoid electric shock.

• Do not clean the air conditioner with water or place objects containing water on it.

• Do not step on or place anything on the indoor/outdoor unit.

Installation, repairs, or relocation should not be done by the customer. Consult your dealer or a contractor for these tasks as they require special techniques and work. If done incorrectly, it may cause a fire, an electric shock, injury, or water leaking. This air conditioner should not be installed by the customer because safety and performance functions cannot be assured.

These models are equipped with an auto restart function. When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and fan speed are stored in memory. If a power failure occurs or the main power is turned off during operation, the “Auto restart function” automatically starts operating in the same mode as the one set with the remote controller just before the shutoff of the main power.

If you do not want to use this function, please consult the service representative because the setting of the unit needs to be changed.

Power Supply:

Insert the power supply plug into the power outlet and/or turn the breaker on. Ensure the plug is clean and fully inserted to prevent fire or electric shock.

Check Air Conditioner Type:

Verify your model type to understand its functions.

Type	Model Name
COOL & HEAT	MSH-GA50/60/71/80VB
COOL ONLY	MS-GA50/60/80VB

Follow these steps to set the batteries and the current time:

1. Remove the front lid and insert two new AAA alkaline batteries. Insert the minus pole of the batteries first and check for correct polarity.

2. Press the RESET button using a thin stick. If this is not done, the remote may not operate correctly.

3. Press the CLOCK set button using a thin stick.

4. Press the HR. and MIN. (TIME SET) buttons to set the current time. Each press of the HR. button increases the time by 1 hour, and each press of the MIN. button increases it by 1 minute.

5. Press the CLOCK set button again and close the front lid.

Handling the remote controller:

• The signal range is about 6 meters when pointed at the front of the indoor unit.

• When a button is pressed, one or two beeps will be heard from the indoor unit. If no sound is heard, operate again.

• To prevent liquid leakage, take out all batteries when the remote controller is not going to be used for a long time.

• If liquid from the batteries gets on your skin or clothes, wash it well with clean water. If it gets in your eyes, wash well with clean water and consult a doctor.

When the remote controller batteries run out or the remote malfunctions, you can use the EMERGENCY OPERATION switch on the indoor unit (when the front panel is opened).

For COOL & HEAT type (MSH series):

1. Press the EMERGENCY OPERATION switch. Each press cycles the unit through EMERGENCY COOL MODE, EMERGENCY HEAT MODE, and STOP MODE.

2. When first pressed, the unit will operate in a test run for 30 minutes (High fan speed, no temperature control), and then shift to the selected emergency mode (Medium fan speed, 24°C set temperature).

3. To stop, press the switch once (if in HEAT MODE) or twice (if in COOL MODE).

The operation mode is indicated by the Operation Indicator lamp on the indoor unit.

For COOL ONLY type (MS series):

1. Press the EMERGENCY OPERATION switch. The unit will first operate in a test run for 30 minutes, then shift to EMERGENCY COOL MODE.

2. In test run and emergency mode, temperature control does not work. The fan speed is High for the first 30 minutes, then shifts to Medium.

3. To stop, press the EMERGENCY OPERATION switch again.

The details of the emergency operation are as follows:

Operation mode	COOL	HEAT
Set temperature	24°C	24°C
Fan speed	Medium	Medium
Horizontal vane	Auto	Auto
Vertical vane	Front	Front

With the “I FEEL…” auto operation mode, the optimum room condition can be set automatically with a one-touch operation.

• To start operation: Press the ON/OFF button. The air conditioner will automatically control to the optimum temperature.

• To stop operation: Press the ON/OFF button again.

• To adjust: If you feel slightly warm, press the ‘down arrow’ temperature button to lower the temperature by about 1°C. If you feel slightly cool, press the ‘up arrow’ temperature button to raise it by about 1°C.

According to the room temperature when the operation starts, the operation mode is automatically set to COOL, DRY, or HEAT. The operation mode selected first is not changed even if the room temperature changes.

COOL & HEAT type (MSH series)			COOL ONLY type (MS series)
Room temperature when started	Operation mode	Target temperature (initial state)	Operation mode	Target temperature (initial state)
About 25°C or higher	COOL	About 24°C	COOL	About 24°C
About 25°C – 23°C	DRY	–	DRY	–
About 23°C or lower	HEAT	About 26°C	DRY	–

1. Press the ON/OFF button to start.

2. Press the MODE button to select the desired operation mode. Each press cycles through the modes: I FEEL… → COOL → DRY → HEAT (MSH series only) or FAN (MS series only).

3. To change the set temperature, press the up or down arrow buttons. Each press changes the temperature by about 1°C.

4. To stop operation, press the ON/OFF button.

Notes on specific modes:

• DRY operation: Temperature control cannot be set. The room temperature is slightly lowered.

• HEAT operation: The fan in the outdoor unit may stop automatically to protect the unit if it absorbs too much heat from the air. This is not a problem.

Air Flow Velocity (Fan Speed):

• While the unit is operating, press the FAN button. Each press changes the fan speed in sequence: (Low) → (Med.) → (High) → (AUTO).

• Use the (High) notch to cool/heat the room more efficiently. Use the (Low) notch if the operating sound disturbs you.

Vertical Air Flow Direction (Horizontal Vane):

• Press the VANE button. Each press changes the angle of the horizontal vane. You can cycle through positions (1) to (5), then SWING, then AUTO.

• Use SWING operation for the air flow to reach all corners of the room.

Horizontal Air Flow Direction (Vertical Vane):

• Press the WIDE VANE button to change the horizontal direction. You can cycle through several positions and a SWING mode.

NOTE: Do not move the horizontal or vertical vanes manually as this may cause trouble. In cooling mode, after 1 hour of downward airflow, the vane may automatically move to a horizontal position to prevent condensation from dripping.

LONG OPERATION

Use this operation when you want the air flow to reach a long distance. While the unit is operating, press the LONG button. The fan speed increases and the horizontal vane moves to the position for LONG mode. To release this mode, press the LONG button again, or the VANE or ECONO COOL button.

ECONO COOL OPERATION

Use this operation to be comfortable in COOL mode while saving energy. While in MANUAL COOL mode, press the ECONO COOL button. The air conditioner will perform a swing operation and the set temperature is automatically set 2°C higher. The swinging air flow makes you feel cooler, saving energy. To release, press the ECONO COOL button again.

To set the ON timer:

1. Press the START (On-timer) button during operation. This toggles the ON timer mode.

2. Set the desired time using the HR. and MIN. buttons. Each press of HR. increases the set time by 1 hour; each press of MIN. increases it by 10 minutes.

3. To release the ON timer, press the START button again.

To set the OFF timer:

1. Press the STOP (Off-timer) button during operation. This toggles the OFF timer mode.

2. Set the desired time using the HR. and MIN. buttons.

3. To release the OFF timer, press the STOP button again.

Note: The ON and OFF timers can be used in combination. The timer that is set to be reached first will operate first. The timer operation cannot be used if the current time has not been set on the remote. If a power failure occurs while a timer is active, the setting is cancelled.

When it is not going to be used for a long time:

1. Perform the FAN operation for 3 to 4 hours to dry the inside of the air conditioner.

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

3. Remove the batteries from the remote controller to prevent liquid leakage.

When the air conditioner is to be used again:

1. Clean the air filter and install it in the indoor unit.

2. Check that the air inlet and outlet of the indoor/outdoor units are not blocked.

3. Check that the earth (ground) is connected correctly.

Before any maintenance, turn off the breaker and/or disconnect the power supply plug.

Cleaning the Indoor Unit Body:

• Clean the unit using a soft dry cloth.

• If dirt is noticeable, wipe with a cloth soaked in a solution of mild detergent diluted in lukewarm water.

• Do not use gasoline, benzine, thinner, polishing powder, or insecticide.

Cleaning the Air Filter (Catechin) (about once every 2 weeks):

1. Open the front panel and remove the air filter.

2. Remove dirt from the air filter using a vacuum cleaner or by washing it with water. If very dirty, use a mild detergent solution in lukewarm water. Do not use hot water (50°C or more).

3. After washing, dry the air filter well in the shade. Do not expose it to direct sunlight or heat from a fire.

4. Re-install the air filter securely.

Replacing the Air Cleaning Filter (about once every 4 months):

When the unit’s capacity is lowered due to dirt, the air cleaning filter needs to be replaced.

1. Remove the air filter.

2. Remove the old air cleaning filter (White bellows type).

3. Install a new air cleaning filter.

4. Install the air filter and securely close the front panel.

The standard usable term is about 4 months. If the filter turns dark brown, replace it at once. The optional part number is MAC-1700FT.

Before calling for service, check the following points:

• The air conditioner cannot be operated: Is the breaker turned on? Is the ON timer set?

• The room cannot be cooled or heated sufficiently: Is the temperature setting correct? Is the filter clean? Are there any obstacles blocking the air inlet or outlet? Is a window or door open?

• The air from the indoor unit smells strange: Is the filter clean? The unit may suck in odors from walls, carpets, furniture, etc., and blow them out.

• Remote controller display is dim or unit does not respond: Are the batteries exhausted? Is the polarity (+, -) of the batteries correct? Are buttons on another remote being pressed?

• After a power failure: The unit should restart automatically if it was on before the failure, due to the auto restart function.

If the problem persists after checking these items, stop using the air conditioner and consult your dealer.

The following are generally not malfunctions:

• Unit won’t operate for ~3 minutes after restart: This is a protective feature from the microprocessor. Please wait.

• Cracking sound: Caused by the expansion/contraction of the front panel due to temperature changes.

• Fan stops during DRY operation: The compressor and fan stop periodically to prevent condensed water from re-evaporating.

• Sound of flowing water or burbling: This is the sound of refrigerant flowing inside the unit, condensed water in the heat exchanger, or air being drawn through the drain hose.

• Mist from the air outlet: Cool air from the unit rapidly cools moisture in the room’s air, turning it into mist.

• Mechanical sound: This is the switching sound of the fan or compressor turning on/off.

• Airflow direction changes automatically: In COOL/DRY mode, if air blows down for an hour, it automatically moves to horizontal to prevent condensation from dripping. In HEAT mode, it may become horizontal if the air temperature is too low.

• Water leaks from the outdoor unit: This is condensation during COOL/DRY mode or from the defrosting operation in HEAT mode.

• White smoke from the outdoor unit: This is vapor generated by the defrosting operation in heating mode.

• Air doesn’t blow out immediately in heating: The unit is preparing to blow out warm air; please wait.

• Operation stops for ~10 minutes during heating: The unit is performing a defrost cycle. Please wait.

• Hissing sound: This is the sound of the refrigerant flow being switched inside the unit.

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

• When water leaks or drops from the indoor unit.

• When the left operation indicator lamp blinks.

• When the breaker trips frequently.

• The remote control signal may not be received in a room where an electronic ON/OFF type fluorescent lamp (inverter-type, etc.) is used.

• Operation of the air conditioner interferes with radio or TV reception.

• When thunder is heard, stop operation and disconnect the power supply plug or turn off the breaker to prevent damage to electrical parts.

		Indoor	Outdoor
Cooling	Upper limit	32°C DB 23°C WB	43°C DB –
	Lower limit	21°C DB 15°C WB	21°C DB –
Heating	Upper limit	27°C DB –	24°C DB 18°C WB
	Lower limit	20°C DB –	-10°C DB -11°C WB