MITSUBISHI ELECTRIC Split-Type Air Conditioners
Indoor Unit Operating Instructions for Models MSZ-AP25VG, MSZ-AP35VG, MSZ-AP42VG, MSZ-AP50VG
Safety Precautions
This unit uses a flammable refrigerant. If refrigerant leaks and comes into contact with fire or a heating appliance, it may create harmful gas and pose a fire hazard. Read the OPERATING INSTRUCTIONS carefully before use. Service personnel must read the OPERATING INSTRUCTIONS and INSTALLATION MANUAL before operating the unit. For more information, refer to the OPERATING INSTRUCTIONS, INSTALLATION MANUAL, and other relevant documentation.
As this product contains rotating parts and parts that could cause electric shock, ensure you read the 'Safety precautions' before use. Always observe the warnings presented here, as they are important for safety. After reading this manual, keep it handy along with the installation manual for easy reference.
Markings and Their Meanings
⚠️ WARNING: Incorrect handling may lead to serious and imminent hazards, such as death or severe injury.
⚠️ CAUTION: Incorrect handling may lead to serious hazards, depending on the conditions.
Meaning of Symbols Used in This Manual
? Do not do.
✅ Follow the instructions.
? Never insert fingers or sticks.
? Never step on the indoor/outdoor unit and do not place anything on them.
⚡ Electric shock hazard. Be careful.
? Make sure to disconnect the power plug from the outlet.
⚡ Make sure to turn off the power supply.
? Fire hazard.
? Never touch with wet hands.
? Never splash water on the unit.
⚠️ 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 could cause overheating, fire, or electric shock.
- Ensure the power plug is free of dirt and securely inserted into the outlet. A dirty or loose plug can cause fire or electric shock.
- Do not bind, pull, damage, modify, heat, or place heavy objects on the power cord. This could cause fire or electric shock.
- Do not turn the breaker ON/OFF or disconnect/connect the power plug during operation. This could cause sparks, leading to fire.
- After turning off the indoor unit with the remote controller, be sure to turn off the breaker or disconnect the power plug.
- Do not expose your body directly to cool air for prolonged periods. This could impair your health.
Safety Precautions for Installation
⚠️ WARNING
- For air conditioner installation, relocation, or maintenance, consult your local representative. Installation by an unqualified person 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 in places where flammable gas may leak. If gas leaks and accumulates around the outdoor 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 telephone ground wire. Improper grounding may cause electric shock.
⚠️ CAUTION
- Install an earth leakage breaker depending on the installation location (e.g., high humidity areas). Failure to install an earth leakage breaker may cause electric shock.
- Ensure proper drainage of excess water. If the drain is improper, water may drip from the indoor/outdoor unit, wetting and damaging furniture.
Safety Precautions for Wi-Fi Interface
⚠️ WARNING (Incorrect handling may lead to serious consequences, including severe injury and death.)
- This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.
- Do not use the Wi-Fi interface near medical electrical equipment or persons with medical devices such as pacemakers or implanted defibrillators. This may cause malfunction of medical equipment or devices.
- Do not install the Wi-Fi interface near automatic control devices such as automatic doors or fire alarms. This may cause accidents due to malfunctions.
- Do not touch the Wi-Fi interface with wet hands. This may cause device damage, electric shock, or fire.
- Do not splash water on the Wi-Fi interface or use it in a bathroom. This may cause device damage, electric shock, or fire.
- If the Wi-Fi interface is dropped or its handle or cord is damaged, disconnect the power plug or turn off the breaker. This may cause fire or electric shock. In this case, consult your local representative.
⚠️ CAUTION (Incorrect handling may lead to serious repercussions, including injury or building damage.)
- Do not climb on an unstable stool to configure or clean the Wi-Fi interface. This may cause you to fall and suffer injuries.
- Do not use the Wi-Fi interface near other wireless devices, microwaves, cordless phones, or similar devices. This may cause them to malfunction.
Disposal
For disposal of this product, consult your local representative.
Note: This symbolic marking is valid exclusively in EU member countries. This symbolic marking is in compliance with Directive 2012/19/EU, Article 14 User Information and Annex IX and/or Directive 2006/66/EC, Article 20 Information for End-Users and Annex II.
Your MITSUBISHI ELECTRIC product is designed and manufactured with high quality materials and components which can be recycled and/or reused. This symbol means that electrical and electronic equipment, batteries, and accumulators, at their end-of-life, must be disposed of separately from your household waste.
If a chemical symbol is printed beneath the symbol (Fig. 1), this chemical symbol means that the battery or accumulator contains a heavy metal at a certain concentration. This will be indicated as follows: Hg: mercury (0.0005%), Cd: cadmium (0.002%), Pb: lead (0.004%).
In the European Union, there are separate collection systems for used electrical and electronic products, batteries, and accumulators. Please dispose of this equipment, batteries, and accumulators correctly at your local community waste collection/recycling centre. Please help us protect the environment!
Part Names
Indoor Unit
The indoor unit consists of a front panel, air filter, air purifying filter (optional silver ion air purifying filter), heat exchanger, horizontal vane, air intake, air outlet, operation indicator lamp, remote control signal receiver, and an emergency stop switch. A technical data plate is also present.
Remote Controller
The remote controller features a battery replacement indicator, operation display section, temperature setting buttons, operation mode selection button, ECONO COOL button, i-save button, NIGHT MODE button, CLOCK button, OFF/ON button, FAN speed control button, WIDE VANE button, VANE control button, TIME/TIMER setting buttons, WEEKLY TIMER setting buttons, and a RESET button. The signal transmission section has a signal range of approximately 6m. The indoor unit emits a beep when a signal is received. The remote controller has a cover that slides down to reveal additional timer buttons.
When not using the remote controller, place it near the unit. Use only the remote controller supplied with the unit. Do not use other remote controllers. If two or more indoor units are installed close to each other, an unintended indoor unit may react to commands intended for another unit.
Outdoor Unit
The outdoor unit has air intake (rear and side), a technical data plate, refrigerant pipes, a drain hose, and an air outlet. The appearance of the outdoor unit may vary. The year and month of manufacture are specified on the technical data plate.
Preparation Before Operation
Before operation: Plug in the power plug and/or turn on the breaker.
Installing Remote Controller Batteries
- Remove the front cover.
- Insert two AAA alkaline batteries, negative pole first.
- Install the front cover.
- Press the RESET button using a thin instrument.
Note: Ensure the battery polarity is correct. Do not use manganese batteries or leaking batteries, as this may cause the remote controller to malfunction. The battery replacement indicator lights up when the battery is low. The remote controller will stop responding within 7 days of the indicator lighting up. Replace all batteries with new ones of the same type. Batteries can be used for approximately 1 year. However, batteries with an expired shelf life will have a shorter operating life. If the RESET button is not pressed, the remote controller may not operate correctly.
Setting the Current Time
- Press the CLOCK button.
- Press the TIME or TIMER button to set the hour. Each press increases/decreases the time by 1 minute (10 minutes for a long press).
- Press the DAY button to set the day.
- Press the CLOCK button again.
Note: Gently press the CLOCK button with a thin instrument.
Setting the Remote Controller Exclusively for a Specific Indoor Unit
Up to 4 indoor units can be used with wireless remote controllers in one room. To operate indoor units individually with each remote controller, assign a number to each remote controller according to the indoor unit number. This setting can only be performed under the following conditions: The remote controller is OFF.
- Press and hold the 1~4 button on the remote controller for 2 seconds to enter pairing mode.
- Press the 1~4 button again to assign a number to each remote controller. Each press of the 1~4 button increases the number in the order: 1→2→3→4.
- Press the SET button to complete the pairing setting.
After turning on the breaker, the first remote controller that transmits a signal to an indoor unit will be considered the remote controller for that indoor unit. Once set, the indoor unit will only receive signals from the assigned remote controller.
Selecting Operating Modes
- Press the OFF/ON button to start operation.
- Press the MODE button to select the operating mode. Each press changes the mode in the following order: AUTO → COOL → DRY → HEAT → FAN.
- Press the ▲ or ▼ button to set the temperature. Each press increases or decreases the temperature by 1°C.
- Press the OFF/ON button again to stop operation.
DRY Mode
Dehumidifies the room. The room temperature may drop slightly. The temperature cannot be set during DRY mode operation.
HEAT Mode
Enjoy warm air at your desired temperature.
FAN Mode
Circulates air inside the room.
Note: After COOL/DRY mode operation, FAN mode operation is recommended to dry the inside of the indoor unit.
Multi-System Operation
Two or more indoor units can be operated by a single outdoor unit. When multiple indoor units are used simultaneously, cooling/drying/fan and heating cannot be performed simultaneously. When COOL/DRY/FAN mode is selected with one unit and HEAT mode with another unit, the last selected unit enters standby mode.
Operation Indicator Lamp
The operation indicator lamp shows the operating status of the unit.
| Indication | Operating Status | Room Temperature |
|---|
| ? | Unit is operating to reach the set temperature. | Minimum 2°C difference from set temperature. |
| ? | Room temperature is approaching the set temperature. | 1 to 2°C difference from set temperature. |
| ⚪ | Standby mode (only during multi-system operation) | |
?: Lit ?: Flashing
AUTO Mode (Automatic Operation)
The unit selects the operating mode based on the difference between the room temperature and the set temperature. In AUTO mode, the unit changes mode (COOL ↔ HEAT) when the difference between the room temperature and the set temperature is approximately 2°C for over 15 minutes.
Note: AUTO mode is not recommended if this indoor unit is connected to an MXZ type outdoor unit. When multiple indoor units are used simultaneously, the unit may not be able to switch between COOL and HEAT modes. In this case, the indoor unit enters standby mode (refer to the operation indicator lamp table).
COOL Mode
Enjoy cool air at your desired temperature.
Note: Do not operate COOL mode at very low outdoor temperatures (below -10°C). Condensed water inside the unit may drip, wetting or damaging furniture.
Adjusting Fan Speed and Airflow Direction
Up-Down Airflow Direction
Press the VANE button to select the airflow direction. Each press changes the airflow direction in the following order: AUTO → 1 → 2 → 3 → 4 → 5 → SWING.
- AUTO: The vane is set for the most efficient airflow direction. COOL/DRY/FAN: horizontal position. HEAT: position (4).
- Manual: For efficient air conditioning, select the upper position for COOL/DRY/FAN and the lower position for HEAT. If the lower position is selected during COOL/DRY/FAN, the vane automatically moves to the upper position after 0.5 to 1 hour to prevent condensation.
- Swing: The vane moves up and down intermittently.
Note: Two short beeps are emitted by the indoor unit when the operating mode is set to AUTO. Always use the remote controller when changing the airflow direction. Manually moving the horizontal vanes will cause them to malfunction. When the breaker is connected, the horizontal vane position is reset in approximately one minute, and then operation begins. The same applies to the emergency cooling function. If the horizontal vanes appear to be in an abnormal position, refer to the troubleshooting section.
Left-Right Airflow Direction
Press the WIDE VANE button to select the airflow direction. Each press changes the airflow direction in the following order: ↔ → ↔ → ↔ → ↔ → SWING.
Fan Speed
Press the FAN button to select the fan speed. Each press changes the fan speed in the following order: AUTO → Silent → Low → Medium → High → Super High.
- Two short beeps are emitted by the indoor unit when the operating mode is set to AUTO.
- Use a higher fan speed to cool/heat the room faster. It is recommended to reduce the fan speed once the room is cooled/heated.
- For silent operation, use a lower fan speed.
Note: When multiple indoor units are used simultaneously by a single outdoor unit for heating operation, the airflow temperature may be low. In this case, it is recommended to set the fan speed to AUTO.
i-save Function
A simplified recall function allows you to recall your preferred (preset) setting with a single button press. Press the button again to immediately return to the previous setting.
- Press the i-save button during COOL, ECONO COOL, HEAT, or NIGHT MODE operation to select i-save mode.
- Set the temperature, fan speed, and airflow direction. The same setting will be selected next time by simply pressing the i-save button. Two settings can be saved (one for COOL/ECONO COOL, and one for HEAT). Select the appropriate temperature, fan speed, and airflow direction according to the room's specifics.
- Press the i-save button again to cancel i-save operation.
Note: i-save operation is also canceled when the MODE button is pressed.
Usage Example:
- Low energy consumption mode: Set the temperature 2°C to 3°C higher in COOL mode and lower in HEAT mode. This setting is suitable for an unoccupied room or during sleep.
- Saving frequently used settings: Save your preferred setting for COOL, ECONO COOL, HEAT, and NIGHT MODE operation. This allows you to select your preferred setting with a single button press.
ECONO COOL Function
Airflow swing (airflow modification) further cools the air compared to stationary airflow. The set temperature and airflow direction are automatically modified by the microprocessor. This allows for cooling operation while maintaining comfort. This can lead to energy savings.
- Press the ECONO COOL button in COOL mode to start ECONO COOL operation. The unit performs vertical swing operation in multiple cycles, depending on the airflow temperature.
- Press the ECONO COOL button again to cancel ECONO COOL operation.
Note: ECONO COOL operation is also canceled when the VANE button is pressed.
Night Mode Operation
NIGHT MODE operation modifies the brightness of the operation indicator, disables audible signals, and limits the outdoor unit noise level.
- Press the NIGHT MODE button during operation to activate NIGHT MODE operation.
- The operation indicator lamp dims.
- The buzzer will be disabled, except for start and stop operations.
- The outdoor unit noise level will be lower than indicated in the SPECIFICATIONS.
- Press the NIGHT MODE button again to cancel NIGHT MODE operation.
Note: Cooling/heating capacity may be reduced. The outdoor unit noise level may not change after the unit starts, during protection mode operation, or depending on other operating conditions. The indoor unit fan speed will not change. The operation mode indicator lamp will be difficult to see in a brightly lit room. The outdoor unit noise level will not be reduced during multi-system operation.
Timer Operation (ON/OFF Timer)
- Press the ON or OFF button during operation to set the timer.
- ON (ON Timer): The unit turns ON at the same time.
- OFF (OFF Timer): The unit turns OFF at the same time.
ON or OFF flashes. Ensure the current time and day are set correctly.
- Press the ▲ (increase) and ▼ (decrease) buttons to set the timer duration. Each press increases or decreases the set duration by 10 minutes. Set the timer while ON or OFF flashes.
- Press the ON or OFF button again to cancel timer operation.
Note: ON and OFF timers can be set together. The mark indicates the order of timer functions. If a power failure occurs while the ON/OFF timer is set, refer to the 'Auto Restart Function' section.
Weekly Timer Setting
Up to 4 ON or OFF timers can be set for each day of the week. Up to 28 ON or OFF timers can be set for a week.
Example: Operates at 24°C from waking up until leaving home, and at 27°C from returning home until bedtime on weekdays. Operates at 27°C from late waking up until early bedtime on weekends.
| Day | Setting 1 (ON) | Setting 2 (OFF) | Setting 3 (ON) | Setting 4 (OFF) |
|---|
| Monday - Friday | 24°C at 6:00 | 8:30 | 27°C at 17:30 | 22:00 |
| Saturday | 27°C at 8:00 | 21:00 | | |
| Sunday | 27°C at 8:00 | 21:00 | | |
Note: Simple ON/OFF timer setting is available when the weekly timer is active. In this case, the ON/OFF timer takes precedence over the weekly timer; weekly timer operation will resume after the simple ON/OFF timer operation ends.
- Press the SET button to access weekly timer setting mode. SET flashes.
- Press the DAY and 1~4 buttons to select the day and setting number. Pressing DAY selects the day of the week to be set (Mon Tue Wed Thu Fri Sat → Sun → Mon Tue Wed Thu Fri Sat Sun). Pressing 1~4 selects the setting number (1-2-3-4).
- Press the ON/OFF, ▲, and TEMP buttons to set the ON/OFF, time, and temperature.
- Press the SET button to finalize and transmit the weekly timer setting. The flashing SET light turns off, and the current time is displayed.
Note: Press and hold the button to quickly modify the time. Press the SET button to transmit weekly timer setting information to the indoor unit. Point the remote controller towards the indoor unit for 3 seconds. When setting the timer for more than one day of the week or a number, it is not necessary to press SET for each setting. Press SET once after completing all settings. All weekly timer settings will be saved. Press the SET button to enter weekly timer setting mode and press and hold DELETE for 5 seconds to delete all weekly timer settings. Point the remote controller towards the indoor unit.
- Press the ON/OFF button to activate the weekly timer. WEEKLY lights up. When the weekly timer is active, the day of the week for which the timer setting is complete will light up.
- Press the ON/OFF button again to deactivate the weekly timer. WEEKLY turns off.
Note: Saved settings will not be deleted when the weekly timer is deactivated.
Checking Weekly Timer Setting
- Press the SET button to enter weekly timer setting mode. SET flashes.
- Press the DAY or 1~4 button to view the setting for a specific day or number.
- Press the CANCEL button to exit weekly timer setting.
Note: When all days of the week are selected to view settings and a different setting is included among them, --- will be displayed.
Emergency Operation
When remote controller operation is not possible, 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: Emergency COOL → Emergency HEAT → Stop.
- Emergency COOL: Set temperature: 24°C, Fan speed: Medium, Horizontal vane: Auto.
- Emergency HEAT: Set temperature: 24°C, Fan speed: Medium, Horizontal vane: Auto.
Note: The first 30 minutes of operation are test operation. Temperature control does not function, and fan speed is set too high. During emergency heating operation, the fan speed gradually increases to blow warm air. During emergency cooling operation, the horizontal vane position is reset in approximately one minute, and then operation begins.
Auto Restart Function
If a power failure occurs during operation or the main breaker is disconnected, the 'Auto Restart Function' starts operation in the same mode as set by the remote controller before the power interruption. When the timer is set, the timer setting is canceled, and the unit starts operation when power is restored.
If you do not wish to use this function, please contact your service representative, as unit settings need to be modified.
Cleaning
Instructions
- Before cleaning, turn off the power supply or disconnect the breaker.
- Be careful not to touch metal parts with your hands.
- Do not use gasoline, thinner, polishing powder, or insecticide.
- Use only diluted neutral detergents.
- Do not use rough brushes, abrasive sponges, or similar products.
- Do not immerse in water or rinse the horizontal vane.
- Do not use water hotter than 50°C.
- Do not expose parts to direct sunlight, heat, or fire to dry them.
- Do not apply excessive force to the fan; otherwise, cracks or breakages may occur.
Air Filter (Air Purifying Filter)
Clean every 2 weeks: Remove dirt with a vacuum cleaner or rinse with water. After washing with water, dry it well in a shaded place.
Air Purifying Filter (Optional Silver Ion Air Purifying Filter)
Every 3 months: Remove dirt with a vacuum cleaner. If dirt cannot be removed by vacuuming, soak the filter and its frame in warm water before rinsing. After washing, dry it well in a shaded place. Install all air filter plates.
Annually: For optimal air filter performance, replace it with a new one. Part number: MAC-2370FT-E.
To remove from the air filter, pull it.
Front Panel
- Lift the front panel until you hear a 'click' sound.
- Hold the hinge and pull it to remove, as illustrated. Wipe with a soft, dry cloth or rinse with water. Do not immerse in water for more than two hours. Dry it well in a shaded place before installing.
- Install the front panel by reversing the removal procedure. Securely close the front panel and press in the indicated places.
Important: For optimal performance and reduced power consumption, clean the filters regularly. Dry filters cause water condensation inside the air conditioning system, which contributes to the growth of fungi such as mold. Therefore, it is recommended to clean the air filters every 2 weeks.
This information is based on REGULATION (EU) No. 528/2012.
| MODEL NAME | Treated Article (Part Name) | Active Substances (CAS No.) | Property | Instructions for Use (Safety Handling Information) |
|---|
| MSZ-AP25/35/42/50VG | FILTER | Silver sodium hydrogen zirconium phosphate (265647-11-8), 2-octyl-2H-isothiazol-3-one (OIT) (26530-20-1) | Antibacterial, Antifungal | Use this product according to the instructions in the manual and only for the indicated purpose. Do not put the product in your mouth. Keep the product out of reach of children. |
| MAC-2370FT-E | FILTER | Silver zinc zeolite (130328-20-0) | Antibacterial | Use this product according to the instructions in the manual and only for the indicated purpose. Do not put the product in your mouth. Keep the product out of reach of children. |
Wi-Fi Interface Configuration (VGK Type Only)
This Wi-Fi interface communicates status information and controls commands from MELCloud by connecting to the indoor unit.
- Open the front panel and remove the Wi-Fi interface.
- Configure a connection between the Wi-Fi interface and the router. Refer to the CONFIGURATION MANUAL and QUICK START REFERENCE GUIDE supplied with the unit. For the CONFIGURATION MANUAL, please access the website: www.melcloud.com/Support
- Place the Wi-Fi interface back in place and close the front panel after configuration is complete.
- For the MELCloud User Manual, please access the website: www.melcloud.com/Support
Introducing the Wi-Fi Interface
| No. | Item | Description |
|---|
| 1 | MODE Switch | Selects modes. |
| 2 | RESET Switch | Resets the system and ALL settings. |
| 3 | ERR LED (Orange) | Indicates network error status. |
| 4 | NET LED (Green) | Indicates network status. |
| 5 | MODE LED (Orange) | Indicates access point mode status. |
| 6 | UNIT LED (Green) | Indicates indoor unit status. |
- MODE Switch: Used to select modes during configurations.
- RESET Switch: Press and hold for 2 seconds to restart the system. Press and hold for 14 seconds to initialize the Wi-Fi interface to factory default settings.
Important: When the Wi-Fi interface is reset to factory default settings, ALL configuration information will be lost. Proceed with extreme caution when performing this operation.
Note: Ensure the router supports WPA2-AES encryption setting before starting Wi-Fi interface configuration. The end-user must read and accept the Wi-Fi service terms and conditions before using this Wi-Fi interface. The router may be required to finalize the connection of this Wi-Fi interface to the Wi-Fi service. This Wi-Fi interface will not start transmitting any operational data from the system until the End-User registers and accepts the Wi-Fi service terms and conditions. This Wi-Fi interface should not be installed and connected to any Mitsubishi Electric system that must provide critical cooling or heating applications. Please note the Wi-Fi interface setting information on the last page of this manual when configuring this Wi-Fi interface. When relocating or disposing, reset the Wi-Fi interface to factory default settings.
The Mitsubishi Electric Wi-Fi interface is designed for communication with the Mitsubishi Electric MELCloud service. Third-party Wi-Fi interfaces cannot be connected to MELCloud. Mitsubishi Electric assumes no responsibility for (i) poor performance of any system or product; (ii) malfunctions of any system or product; or (iii) loss or damage to any system or product; caused by connecting to and/or using a third-party Wi-Fi interface or any third-party Wi-Fi service with Mitsubishi Electric equipment.
For the latest information on MELCloud from Mitsubishi Electric Corporation, please visit www.melcloud.com/Support.
Troubleshooting
Even if these items are checked, if the unit does not resume normal operation, stop using the air conditioning system and contact your local representative.
Indoor Unit Symptoms and Checks
| Symptom | Explanation and Checkpoints |
|---|
| Unit cannot be operated. | Is the breaker connected? Is the power cord plug connected to the outlet? Is the ON timer set? |
| Horizontal vane does not move. | Are the horizontal and vertical vanes installed correctly? Is the fan guard deformed? When the breaker is connected, the horizontal vane position is reset in approximately one minute. After reset, normal operation of the horizontal vanes resumes. The same applies to the emergency cooling function. |
| Unit cannot be operated for approximately 3 minutes after restart. | The unit is protected according to microprocessor instructions. Please wait. |
| Water vapor is released from the indoor unit's air outlet. | Cold air inside the unit rapidly cools the humidity in the room air, which is transformed into water vapor. |
| Horizontal VANE swing operation is suspended for a period, then resumes. | This allows for normal horizontal VANE swing operation. |
| When PENDULUM function is selected in COOL/DRY/FAN mode, the lower horizontal vane does not move. | It is normal for the lower horizontal vane not to move when PENDULUM function is selected in COOL/DRY/FAN mode. |
| Airflow direction changes during operation. Airflow direction cannot be adjusted with the remote controller. | When the unit is operating in COOL or DRY mode, if continuous downward airflow operation occurs for 0.5-1 hour, the airflow direction is automatically set to upward to prevent condensation and water leakage. In heating function, if the airflow temperature is too low or when defrosting is performed, the horizontal vane is automatically set to the horizontal position. |
| Operation stops for approximately 10 minutes during heating operation. | The outdoor unit is in defrost mode. Please wait; this operation will be completed in a maximum of 10 minutes. (Ice forms when the outdoor temperature is too low and humidity is too high.) |
| Unit starts operation autonomously when the main unit is activated but has not received any signal from the remote controller. | These models are equipped with an auto-restart function. When the main breaker is disconnected without the unit being turned off via the remote controller, and then turned on again, the unit automatically starts operation in the same mode as set by the remote controller before the power interruption. Refer to the 'Auto Restart Function' section. |
| The two horizontal vanes touch each other. The horizontal vanes are in an abnormal position. The horizontal vanes do not return to the correct 'closed position'. | Perform one of the following operations: Disconnect and reconnect the breaker. Ensure the horizontal vanes move to the 'closed position' correctly. Start and stop emergency cooling operation and ensure the horizontal vanes move to the 'closed position' correctly. |
| In COOL/DRY mode, when the room temperature is close to the set temperature, the outdoor unit stops, and then the indoor unit operates at low speed. | When the room temperature deviates from the set temperature, the indoor fan operates according to the remote controller settings. |
| Indoor unit discolors over time. | Although plastic material yellows due to factors such as UV rays and temperature, this does not affect product performance. |
| Operation indicator lamp is dim. Unit does not emit audible signals. | Is NIGHT MODE operation set? |
| Indoor unit that is not operating heats up and emits a sound similar to flowing water. | A small amount of refrigerant continues to flow in the indoor unit even when it is not operating. |
| When heating operation is selected, operation does not start immediately. | When operation starts after the outdoor unit defrosting is complete, it takes a few minutes (maximum 10 minutes) until warm air is blown. |
Outdoor Unit Symptoms and Checks
| Symptom | Explanation and Checkpoints |
|---|
| Outdoor unit fan does not rotate, even if the compressor is operating. It stops soon, even if the fan starts rotating. | When the outdoor temperature is low during cooling operation, the fan operates intermittently to maintain sufficient cooling capacity. |
| Water leaks from the outdoor unit. | During COOL and DRY operations, the pipe sections or pipe connections are cooled, causing water condensation. During heating operation, condensed water from the heat exchanger drains. During heating operation, defrosting causes melting and drainage of ice accumulated on the outdoor unit. |
| White smoke is released from the outdoor unit. | During heating operation, vapor generated by defrosting appears as white smoke. |
Remote Controller Symptoms and Checks
| Symptom | Explanation and Checkpoints |
|---|
| Remote controller display is not active or dim. Indoor unit does not react to remote controller signal. | Are the batteries discharged? Is the battery polarity (+, -) correct? Is any button on other electrical appliance remote controllers pressed? |
| Room cannot be cooled or heated sufficiently. | Is the temperature setting appropriate? Is the fan setting appropriate? Please change the fan speed to High or Super High. Are the filters clean? Is the indoor unit's fan or heat exchanger clean? Are there obstacles blocking the air intake or outlet of the indoor or outdoor unit? Is a window or door open? It may take some time until the set temperature is reached, or it may not be reached, depending on room size, ambient temperature, or similar conditions. Is NIGHT MODE operation set? |
| Room cannot be cooled sufficiently. | When an exhaust fan or stove is used in a room, the cooling load increases, resulting in insufficient cooling effect. When the outdoor temperature is high, the cooling effect may not be sufficient. |
| Room cannot be heated sufficiently. | When the outdoor temperature is low, the heating effect may not be sufficient. |
| Air is not blown in time during heating operation. | Please wait, as the unit is preparing to blow warm air. |
Airflow Symptoms and Checks
| Symptom | Explanation and Checkpoints |
|---|
| Air from the indoor unit has a strange odor. | Are the filters clean? Is the indoor unit's fan or heat exchanger clean? The unit may absorb an odor from the wall, carpet, furniture, textiles, etc., and release it with the air. |
Noise Symptoms and Checks
| Symptom | Explanation and Checkpoints |
|---|
| Cracking sounds are emitted. | This noise is generated by the expansion/contraction of the front panel, etc., due to temperature changes. |
| Bubbling sounds are emitted. | This noise is emitted when outside air is absorbed from the drain hose by the rotation of the hood or exhaust fan, causing water to drain from the drain hose. This noise is also produced when outside air is blown into the drain hose if the wind blows strongly. |
| Indoor unit emits a mechanical sound. | This is the noise produced when the fan or compressor is activated/deactivated. |
| Water flowing sound is emitted. | This noise is produced by the refrigerant or condensed water flowing inside the unit. |
| Sometimes, whistling sounds are heard. | This noise is produced when the refrigerant flow changes inside the unit. |
Timer Symptoms and Checks
| Symptom | Explanation and Checkpoints |
|---|
| Weekly timer does not function according to settings. | Is the ON/OFF timer set? Transmit the weekly timer setting information to the indoor unit again. When the information is successfully received, the indoor unit emits a long beep. If the information is not received, 3 short beeps are emitted. Ensure the information is successfully received. If a power failure occurs and the power is interrupted, the time displayed by the indoor unit's built-in clock will no longer be correct. Consequently, the weekly timer may not function normally. Ensure you place the remote controller in a location where the signal can be received by the indoor unit. Is the weekly timer set? |
| Unit starts/stops autonomously. | Is the weekly timer set? |
Wi-Fi Interface Symptoms and Checks
| Symptom | Explanation and Checkpoints |
|---|
| An error occurs during connection configuration or operation. | Refer to the CONFIGURATION MANUAL. For the CONFIGURATION MANUAL, please access the website: www.melcloud.com/Support |
When the Air Conditioning System Is Not Used for a Long Period
- Operate the unit in COOL mode with the highest set temperature or in FAN mode for 3 to 4 hours. This dries the inside of the unit. Humidity inside the air conditioning system contributes to the creation of favorable conditions for the growth of fungi, such as mold.
- Press the OFF/ON button to stop operation.
- Turn off the breaker and/or disconnect the power plug.
- Remove all batteries from the remote controller.
When Re-operating the Air Conditioning System
- Clean the air filter.
- Check if the air intake and outlet of the indoor and outdoor units are blocked.
- Check if the grounding system is correctly connected.
- Refer to the 'PREPARATION BEFORE USE' section and follow the instructions.
Installation Location and Electrical Installation
Installation Location
Avoid installing the air conditioning system in the following locations:
- Places with large quantities of machine oil.
- Places with high salinity, e.g., near the sea.
- Places where sulfur gas is generated, such as thermal spring areas, sewage networks, and wastewater collection.
- Areas with oil splashes or oily smoke (such as cooking areas and factories where plastic properties may be modified and deteriorated).
- High-frequency areas or areas with wireless equipment.
- Areas where the air from the outdoor unit's air outlet is blocked.
- Areas where operating noise or air from the outdoor unit may disturb neighbors.
- A mounting height of 1.8 m to 2.3 m for the indoor unit is recommended. If this is not possible, please contact your local representative.
- Do not use the air conditioning system during construction and interior decoration work or during floor waxing. After such work, ventilate the room well before using the air conditioning system. Otherwise, volatile elements may adhere to the inside of the air conditioning system, causing water leakage or dripping.
- Do not use the Wi-Fi interface near medical electrical equipment or persons with medical devices such as pacemakers or implanted defibrillators. This may cause malfunction of medical equipment or devices.
- This equipment must be installed and used at a minimum distance of 20 cm between the device and the user or other persons.
- Do not use the Wi-Fi interface near other wireless devices, microwaves, cordless phones, or similar devices. Otherwise, they may malfunction.
To prevent the effects of a fluorescent lamp, ensure the greatest possible distance. Keep distance to prevent image distortion or noise generation. The outdoor unit installation location should be at least 3 m away from TV antennas, radio sets, etc. In areas where signal reception is weak, ensure a larger space between the outdoor unit and the affected device's antenna if the air conditioning system operation interferes with radio or TV signal reception. For optimal efficiency and to extend the useful life of the appliance, the outdoor unit should be installed in a dry and well-ventilated place.
Electrical Installation
Provide a separate circuit for the air conditioning system's power supply. Ensure the breaker capacity is taken into account. If you have any questions, please contact your local representative.
Specifications
| Model | Indoor | MSZ-AP25VG(K) MUZ-AP25VG(H) | MSZ-AP35VG(K) MUZ-AP35VG(H) | MSZ-AP42VG(K) MUZ-AP42VG(H) | MSZ-AP50VG(K) MUZ-AP50VG(H) |
|---|
| Function | | Cooling | Heating | Cooling | Heating | Cooling | Heating | Cooling | Heating |
| Power Supply | | ~/N, 230 V, 50 Hz |
| Capacity | kW | 2.5 | 3.2 | 3.5 | 4.0 | 4.2 | 5.4 | 5.0 | 5.8 |
| Input | kW | 0.60 | 0.78 | 0.99 | 1.03 | 1.30 | 1.49 | 1.55 | 1.60 |
| Weight | Indoor | 10.5 kg |
| Outdoor | 31 kg | 31 kg | 35 kg | 40 kg |
| Refrigerant Charge (R32) | kg | 0.55 | 0.55 | 0.70 | 1.00 |
| IP Code | Indoor | IP 20 |
| Outdoor | IP 24 |
| Permissible Operating Pressure | LP ps MPa | 2.77 |
| HP ps MPa | 4.17 |
| Noise Level | Indoor (Super High/High/Medium/Low/Silent) dB(A) | 42/36/30/24/19 | 45/39/34/24/19 | 42/36/30/24/19 | 45/38/31/24/19 | 42/38/34/29/21 | 45/40/35/29/21 | 44/40/36/33/28 | 48/43/38/33/28 |
| Outdoor dB(A) | 47 | 48 | 49 | 50 | 50 | 51 | 52 | 52 |
Guaranteed Operating Range
| | Indoor | Outdoor |
|---|
| Cooling | Upper Limit | 32 °C DB, 23 °C WB | 46 °C DB |
| Lower Limit | 21 °C DB, 15 °C WB | -10 °C DB |
| Heating | Upper Limit | 27 °C DB | 24 °C DB, 18 °C WB |
| Lower Limit | 20 °C DB | -15 °C DB, -16 °C WB |
Note: Nominal Condition: Cooling: Indoor: 27°C DB, 19°C WB; Outdoor: 35°C DB. Heating: Indoor: 20°C DB; Outdoor: 7°C DB, 6°C WB. DB: Dry Bulb Temperature. WB: Wet Bulb Temperature.
Wi-Fi Interface Specifications
| Model | MAC-5661FB-E |
|---|
| Input Voltage | D.C. 12.7 V (from indoor unit) |
| Power Consumption | MAX. 2 W |
| Dimensions H×W×D (mm) | 79×44×18.5 |
| Weight (g) | 60 (including cable) |
| MAX. Emitter Power Level | 17.5 dBm according to IEEE 802.11b |
| RF Channel | 1 channel ~ 13 channels (2412~2472 MHz) |
| Radio Protocol | IEEE 802.11b/g/n (20) |
| Encryption | AES |
| Authentication | WPA2-PSK |
| Software Version | XX.00 |
For the Declaration of Conformity, please access the website: www.melcloud.com/Support.
