MITSUBISHI ELECTRIC MSH-GA50VB (01) PDF DOCUMENT

Please observe the following warnings for safe operation:

• 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. A fire or electric shock may result from poor contact, poor insulation, or exceeding the permissible current.

• Remove dirt from the power supply plug and securely insert it into the outlet. If dirt is present or insertion is incomplete, it may cause a fire or an electric shock.

• Do not damage or process the power supply cord. Do not put heavy objects on the cord, or scratch or process it. A damaged cord can cause a fire or electric shock.

• Do not turn the breaker off/on or disconnect/connect the power supply plug during operation. This may cause a fire due to sparks. Always turn the indoor 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.

• Installation, repairs, or relocation should not be done by the customer. Incorrect work can cause fire, electric shock, or injury from the unit falling or water leaking. Consult your dealer.

• If the power supply cord is damaged, it must be replaced by the manufacturer or its service agent to avoid a hazard.

• Do not insert your finger, a stick, or other objects into the air inlet/outlet. The fan rotates at high speed and may cause injury. Supervise young children to ensure they do not play with the air conditioner.

• If an abnormality like a burning smell occurs, stop the air conditioner, disconnect the power supply plug, and/or turn off the breaker. Continued operation in an abnormal condition may cause a fire or other trouble. In this case, consult your dealer.

Please adhere to the following cautions:

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

• Do not touch the air inlet or aluminum fin of the outdoor unit to prevent injury.

• Do not place a vase or glass on the indoor unit, as water spilling into the unit can cause an electric shock.

• Do not use an insecticide or flammable spray on the unit, which could cause a fire or deformation.

• Do not place a pet or houseplant where it will be exposed to direct airflow.

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

• Do not leave the unit on a damaged installation stand, as it may fall and cause injury.

• Do not step onto an unstable bench when maintaining the unit.

• Do not pull the power supply cord, as it may cause a fire.

• Do not charge, disassemble, or throw batteries into a fire.

• Do not operate the unit for a long time in high humidity (80% RH or more) with a door or window open. In cooling mode, this can cause water to condense and drip, potentially damaging furniture.

• Do not use the unit for special purposes, such as preserving food, animals, or art objects.

• Do not place a stove where it is exposed to direct airflow, as this may cause imperfect combustion.

• When cleaning the unit, switch it off and disconnect the power supply. The fan rotates at high speed and can cause injury.

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

• Do not clean the air conditioner with water, as it may degrade the insulation and cause an electric shock.

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

Indoor Unit:

• Front panel

• Air inlet

• Power supply plug and cord

• Remote control receiving section

• Air cleaning filter (White bellows type)

• Air filter (Catechin)

• Vertical vane

• Horizontal vane

• Operation section (behind front panel) with Emergency operation switch and Display section

• Operation Indicator lamp

Outdoor Unit (MUH-GA50VB):

• Air inlet (back and side)

• Piping

• Drainage hose

• Air outlet

• Drain outlet

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.

Remote Controller Setup:

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

2. Press the RESET button using a thin stick. This must be done for the remote to operate correctly.

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

4. Press the HR. and MIN. buttons to set the current time. Each press of the HR. button advances the time by 1 hour; each press of the MIN. button advances it by 1 minute.

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

The MITSUBISHI ELECTRIC MSH-GA50VB is equipped with an auto restart function. If the main power is turned off during operation (e.g., during a power failure), this function automatically restarts the unit in the same mode (operation mode, set temperature, fan speed) that was set on the remote controller just before the power was shut off.

• If the unit was turned off with the remote controller before the power failure, it will remain off when power is restored.

• If the unit was in “I FEEL…” mode before a power failure, the operation is not stored in memory. The operation mode will be decided by the initial room temperature when it restarts.

If you do not want to use this function, the setting needs to be changed by a service representative.

If the remote controller’s batteries are dead or it is malfunctioning, you can use the EMERGENCY OPERATION switch located behind the front panel of the indoor unit.

1. Press the EMERGENCY OPERATION switch. Each press cycles through the modes: EMERGENCY COOL -> EMERGENCY HEAT -> STOP.

2. When first pressed, the unit will operate in a test run for 30 minutes (High fan speed) before shifting to the selected emergency mode.

3. To stop the operation, press the switch until the unit is in STOP MODE. For example, from EMERGENCY COOL MODE, press it twice to stop. From EMERGENCY HEAT MODE, press it once.

The settings for emergency operation are fixed as follows, and the temperature cannot be adjusted.

The Operation Indicator lamp on the indoor unit will indicate the current mode.

The “I FEEL…” auto operation mode automatically sets the optimum room condition.

• To start operation: Press the ON/OFF button. If the unit is not already in “I FEEL…” mode, press the MODE button until “I FEEL…” is selected.

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

• To adjust temperature: If you feel slightly warm, press the ‘down’ temperature button (▼). If you feel slightly cool, press the ‘up’ temperature button (▲). Each press adjusts the target temperature by about 1°C.

In this mode, the air conditioner automatically selects COOL, DRY, or HEAT based on the room temperature when it starts. The initial target temperatures are:

The operation indicator lamp on the right side of the indoor unit shows the operating state:

1. Press the ON/OFF button to start the unit.

2. Press the MODE button to select your desired operation mode. Each press cycles the mode in the following sequence: I FEEL… -> COOL -> DRY -> HEAT.

3. To change the set temperature, press the ‘up’ (▲) or ‘down’ (▼) temperature buttons. Each press raises or lowers the temperature by 1°C.

4. To stop the unit, press the ON/OFF button again.

Note:

• In DRY operation, the temperature cannot be set. The room temperature will be slightly lowered.

• In HEAT operation, if the unit absorbs too much heat from the air, the outdoor fan may stop automatically to protect the unit. This is normal.

Air Flow Velocity (Fan Speed):

Press the FAN button. Each press changes the fan speed in sequence: ■ (Low) -> ■■ (Med.) -> ■■■ (High) -> ■■■■ (AUTO).

• Use the ■■■ (High) setting to cool/heat the room more efficiently.

• Use the ■ (Low) setting for quieter operation.

Vertical Air Flow (Horizontal Vane):

Press the VANE button. Each press changes the angle of the horizontal vane. The sequence is (1) -> (2) -> (3) -> (4) -> (5) -> (SWING) -> (AUTO).

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

• In AUTO mode, the vane position is set automatically for effective operation based on the mode (e.g., horizontal for COOL, downwards for HEAT).

Horizontal Air Flow (Vertical Vane):

Press the WIDE VANE button. Each press changes the horizontal direction of the air flow. You can also select a (SWING) option for the vertical vanes to move side-to-side.

Note: Do not move the horizontal or vertical vanes by hand, as this may cause trouble. Always use the remote controller.

LONG Operation:

Use this operation to make the air flow reach a long distance.

• To use: While the unit is operating, press the LONG button. The fan speed increases and the horizontal vane moves to a position for long-distance air flow.

• To release: Press the LONG button again. The mode is also released by pressing the VANE or ECONO COOL buttons.

ECONO COOL Operation:

Use this operation for comfortable cooling with energy savings.

• To use: While in MANUAL COOL mode, press the ECONO COOL button. The unit performs a swing operation in various cycles, and the set temperature is automatically raised by 2°C. The swinging air flow makes you feel cooler than constant air flow, allowing for energy savings while maintaining comfort.

• To release: Press the ECONO COOL button again. The mode is also released if you press the VANE or WIDE VANE button or change the operation mode.

The current time must be set on the remote for the timer to function.

How to set the ON timer:

1. Press the START (On-timer) button during operation to enter ON timer setting mode.

2. Use the HR. and MIN. buttons to set the desired time for the unit to turn on. Each press of HR. increases the time by 1 hour; each press of MIN. increases it by 10 minutes.

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

How to set the OFF timer:

1. Press the STOP (Off-timer) button during operation to enter OFF timer setting mode.

2. Use the HR. and MIN. buttons to set the desired time for the unit to turn off.

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

Programming Timer Operation:

You can use the ON and OFF timers in combination. The timer for the set time that is reached first will operate first.

Follow these steps:

1. Perform the FAN operation for 3 to 4 hours to dry the inside of the air conditioner. To do this, set the remote controller to the highest temperature in the MANUAL COOL mode.

2. Turn off the breaker and/or disconnect the power supply plug. This prevents dirt from collecting and potentially causing a fire.

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

Follow these steps:

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

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

3. Check that the earth is connected correctly. Do not connect the earth to a gas pipe, water pipe, lightning rod, or telephone earth.

Clean the air filter about once every 2 weeks. Before starting, turn off the power.

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

2. Remove dirt from the air filter using a vacuum cleaner, or wash it with water. If the dirt is noticeable, wash the filter with a solution of mild detergent diluted in lukewarm water. Do not use hot water (50°C or more) as it may deform the filter.

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

4. Install the air filter back into the unit and close the front panel.

The air cleaning filter should be replaced about once every 4 months, or when the unit’s capacity is lowered due to dirt. The filter is disposable.

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

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

3. Install a new air cleaning filter.

4. Re-install the main air filter and securely close the front panel.

Optional replacement parts are available from your local dealer:

Please check the following points:

• Is the breaker turned on?

• Is the fuse blown?

• Is the ON timer set? If so, the unit will turn on at the set time.

This is a protective function. The microprocessor is preventing the unit from restarting immediately to protect the compressor. Please wait for about 3 minutes for it to resume operation.

Check these possible causes:

• Is the temperature setting correct?

• Is the air filter clean? A dirty filter restricts airflow.

• Are there any obstacles blocking the air inlet or outlet of the indoor or outdoor unit?

• Is a window or door open?

• If a ventilation fan or gas cooker is used in the room, the cooling load increases, which can result in insufficient cooling.

• When the outside air temperature is very high (for cooling) or very low (for heating), the unit’s performance may be reduced.

First, check if the air filter is clean. If it is, the air conditioner may be sucking in odors adhering to the walls, carpet, furniture, or clothes in the room and then blowing them out with the air. It is not a malfunction.

This usually indicates an issue with the batteries. Please check the following:

• Are the batteries exhausted? Try replacing them with new ones.

• Is the polarity (+, -) of the batteries correct?

• Are any buttons on the remote controller of another electric appliance being pressed? This can sometimes cause interference.

These models are equipped with an auto restart function. If the air conditioner was operating before the power failure, it will automatically start operating again in the same mode once power is restored. If it was off before the power failure, it will remain off.

This sound is generated by the slight expansion and contraction of the front panel or other plastic parts due to temperature changes. This is normal and not a malfunction.

In DRY operation, the unit cycles on and off to reduce humidity without significantly lowering the room temperature. The compressor and indoor fan will sometimes stop to prevent water that has condensed on the heat exchanger from re-evaporating into the room. This is normal operation.

No, this is not a problem. These sounds are normal:

• Water flowing sound: This is the sound of refrigerant flowing inside the air conditioner, or the sound of condensed water in the heat exchanger.

• Burbling sound: This sound can occur if outside air is being sucked into the drain hose, for example, when a kitchen range hood is turned on or if it’s very windy outside. This is the sound of water in the drain hose being affected by the air pressure.

This is not a malfunction. The cool air from the air conditioner rapidly cools the moisture in the indoor air, causing it to condense into a visible mist.

This is an automatic function to ensure comfort and proper operation:

• In COOL or DRY mode: If the unit operates with the air blowing downwards (vane positions 4 or 5) for 1 hour, the horizontal vane automatically moves to the horizontal position to prevent condensed water from dripping.

• In HEATING mode: If the air flow temperature is too low or when the unit is in defrost mode, the horizontal vane automatically moves to the horizontal position to prevent blowing cold air directly onto occupants.

This is generally normal:

• During COOL and DRY operations: Pipes and pipe connecting sections become cold, which causes condensation to form and drip.

• During HEATING operation: The defrosting cycle melts frost that has formed on the outdoor unit, causing water to drip down. Water may also drip from the heat exchanger. This is not a malfunction.

This is not smoke. It is water vapor generated by the defrosting operation. Frost on the outdoor unit’s heat exchanger is melted, creating steam that looks like white smoke. This is normal.

Please wait. The air conditioner is preparing to blow out warm air and prevents cold drafts by waiting until the indoor coil is warm enough. This is a normal function.

The unit is performing a defrosting operation. When the outside temperature is low and humidity is high, frost can form on the outdoor unit. The defrost cycle melts this frost to maintain heating efficiency. The operation will resume automatically after about 10 minutes. Please wait.

If you have checked the basic troubleshooting points and the problem persists, stop using the air conditioner and consult your dealer in the following cases:

• When water leaks or drips 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 fluorescent lamp, etc.) is used.

• Operation of the air conditioner interferes with radio or TV reception in areas where reception is weak.

• When you hear thunder, stop operation and disconnect the power supply plug or turn off the breaker to protect the electrical parts from damage.