Mitsubishi Electric Mr. SLIM Air-Conditioners

1. Safety Precautions

Before installing the unit, read all "Safety Precautions". These provide important safety points; ensure you follow them. Report to or obtain consent from the supply authority before connecting to the system.

Symbols used in the text:

• ⚠️ Warning: Describes precautions to prevent danger of injury or death to the user.
• ❗ Caution: Describes precautions to prevent damage to the unit.

Symbols used in the illustrations:

• [Ground Symbol]: Indicates a part which must be grounded.

General Warnings:

• These appliances are not accessible to the general public.
• The unit must not be installed by the user. Ask a dealer or authorized company for installation. Improper installation may result in water leakage, electric shock, or fire.
• Do not stand on or place items on the unit.
• Do not splash water on the unit or touch it with wet hands; this may cause electric shock.
• Do not spray combustible gas near the unit; this may result in fire.
• Do not place gas heaters or open-flame appliances where they will be exposed to discharged air; this may cause incomplete combustion.
• Do not remove the front panel or fan guard from the outdoor unit while it is running.
• If you notice abnormal noise or vibration, stop operation, turn off the power switch, and contact your dealer.
• Never insert fingers, sticks, etc., into the intakes or outlets.
• If you detect odd smells, stop using the unit, turn off the power switch, and consult your dealer to avoid breakdown, electric shock, or fire.
• This air conditioner is NOT intended for use by children or infirm persons without supervision.
• Young children must be supervised to ensure they do not play with the air conditioner.
• If refrigerant gas blows out or leaks, stop operation, ventilate the room thoroughly, and contact your dealer.
• This appliance is intended for use by expert or trained users in shops, light industry, farms, or for commercial use by lay persons.
• This appliance can be used by children aged 8+ and persons with reduced physical, sensory, or mental capabilities or lack of experience, if supervised or instructed on safe use and hazards. Children shall not play with the appliance. Cleaning and maintenance by children require supervision.
• This appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience, unless supervised or instructed by a responsible person.
• Children should be supervised to ensure they do not play with the appliances.
• When installing, relocating, or servicing, use only the specified refrigerant (R410A). Do not mix refrigerants or allow air into the lines. Air mixed with refrigerant can cause high pressure, leading to explosion or other hazards. Using non-specified refrigerant can cause mechanical failure, malfunction, or breakdown, potentially compromising product safety.

Disposing of the unit: Consult your dealer when you need to dispose of the unit.

2. Parts Names

Indoor Unit

Ceiling Concealed Unit Diagram: A diagram shows the indoor unit designed for ceiling concealment.

Remote Controllers (Optional Parts)

Radio Frequency Interface: Depicts an RF interface unit.

RF Thermostat: Depicts an RF thermostat unit.

Wired Remote Controller: Depicts a wired remote controller with a screen and buttons.

IR Wireless Remote Controller: Depicts an IR wireless remote controller with a screen and buttons.

Wired Remote Controller Interface

The controller interface shows a display screen and various buttons:

• Display Screen: Shows operation settings, time, room temperature, set temperature, mode, and fan speed. It can display in "Full" or "Basic" mode.
• Buttons:
• [ON/OFF] button (1): Turns the indoor unit ON/OFF.
• [SELECT] button (2): Saves settings.
• [RETURN] button (3): Returns to the previous screen.
• [MENU] button (4): Opens the Main menu.
• Backlit LCD (5): Displays operation settings. Backlight turns on when a button is pressed if off.
• ON/OFF Lamp (6): Green when operating, blinks during startup or error.
• Function buttons [F1] (7), [F2] (8), [F3] (9), [F4] (10): Used for changing operation mode, temperature, and fan speed, or navigating menus.

Display Modes:

The main display can be in "Full" mode (all icons shown) or "Basic" mode. The factory setting is "Full".

Display Icons Explanation:

• Operation mode: Shows the current mode (Cool, Dry, Fan, Auto, Heat).
• Preset temperature: Displays the set temperature.
• Clock: Shows the current time.
• Fan speed: Indicates the fan speed setting.
• Button function guide: Displays the functions of the corresponding buttons.
• Central Control Indicators: Icons appear when ON/OFF, mode, or temperature are centrally controlled.
• Filter Maintenance Indicator: Shows when the filter needs maintenance.
• Room temperature: Displays the current room temperature.
• Button Lock Indicator: Appears when buttons are locked.
• Timer Indicators: Icons for On/Off Timer, Night Setback, Auto-Off Timer, and Weekly Timer.
• Energy-Save Mode Indicator: Appears when the unit is in energy-save mode.
• Silent Mode Indicator: Appears when outdoor units are in silent mode.
• Thermistor Indicators: Show if the remote controller's or indoor unit's thermistor is used for temperature monitoring.
• 3D i-see Sensor Indicator: Appears when operating with the 3D i-see Sensor.
• Vane/Louver/Ventilation Indicators: Show settings for vane, louver, and ventilation. Some may not be available for all models.
• Temperature Range Restriction Indicator: Appears when the preset temperature range is restricted.

Wireless Remote Controller Interface

The wireless remote controller has a display screen and various buttons:

• Display Screen: Shows operation status, timer, and other information. All elements are shown when the Reset button is pressed.
• Transmission Area: Indicates the direction for signal transmission.
• Transmission Indicator: Shows signal transmission status.
• Timer Indicator: Shows timer status.
• Operation Areas: Buttons for controlling operation.
• Buttons:
• ON/OFF button: Turns the unit ON/OFF.
• Temperature adjustment buttons: Increase/decrease set temperature.
• Fan Speed button: Changes fan speed.
• Airflow button: Changes up/down airflow direction.
• Mode button: Changes operation mode (Cool, Dry, Fan, Auto, Heat).
• Check button: For checking operations.
• Test Run button: For test runs.
• Timer On/Off buttons: For setting timers.
• Hour/Minute buttons: For setting time.
• Set Time button: Sets the clock.
• Louver button: Changes left/right airflow direction.
• Reset button: Resets the controller.

Note for Wireless Remote Controller: Point towards the indoor unit receiver. Signals are received up to approx. 7 meters (23 ft) within a 45° angle. Bright lights may affect reception. If the operation lamp blinks, consult your dealer. Handle with care, avoid dropping, shocks, moisture, or high humidity. Use the included holder to store the remote.

Outdoor Unit

A diagram shows the outdoor unit with connections for:

• Power: Electrical supply.
• Ref. Pipes: Refrigerant pipes connecting to the indoor unit.
• Indoor-Outdoor Connection wire: Electrical connection.
• Earth: Ground connection.
• Service Panel: Access panel for maintenance.

Battery Installation/Replacement

1. Remove the top cover, insert two AAA batteries (observing correct polarity: negative (-) first), and reinstall the top cover.
2. Press the Reset button.

3. Operation

Refer to the operation manual supplied with each remote controller for detailed operation methods.

3.1. Turning ON/OFF

• Press the [ON/OFF] button to turn the unit ON. The ON/OFF lamp lights green.
• Press the [ON/OFF] button again to turn the unit OFF. The ON/OFF lamp turns off.
• Note: The unit will not restart for approximately 3 minutes after shutdown to prevent internal component damage.

Operation Status Memory

The unit remembers the last operation mode, preset temperature, and fan speed before power off.

Settable Preset Temperature Range

3.2. Mode Selection

Press the [F1] button to cycle through operation modes: Cool, Dry, Fan, Auto, Heat. Select the desired mode.

Blinking Mode Icon: If the mode icon blinks, it means other indoor units in the same system are operating in a different mode. The group can only operate in the same mode.

Automatic Operation: The unit automatically switches between cooling and heating based on room temperature relative to the set temperature. If the room temperature deviates by 2.0 °C (4 °F) or more for 15 minutes, the mode will change.

3.3. Temperature Setting

Use the [F2] button to decrease and the [F3] button to increase the preset temperature.

• Refer to the table for settable temperature ranges per mode.
• Preset temperature cannot be set for Fan/Ventilation operation.
• Temperature is displayed in Celsius or Fahrenheit, depending on the model and display setting.

3.4. Fan Speed Setting

Press the [F4] button to cycle through fan speeds (e.g., Low, Medium, High, Auto). Available speeds depend on the indoor unit model.

Notes on Fan Speed: Actual fan speed may differ from display in standby/defrost states, during heating with low heat exchanger temperature, in HEAT mode when room temp is higher than set temp, or in DRY mode.

3.5. Navigating through the Main Menu

Press the [MENU] button to access the Main menu. Use [F1] (down) and [F2] (up) to navigate. Press [F3] (previous page) and [F4] (next page) to navigate pages. Press [RETURN] to exit the menu. The screen returns to the main display after 10 minutes of inactivity.

Unsupported Functions: A message appears if a function is not supported by the indoor unit model.

3.6. Ventilation

For LOSSNAY combination units, ventilation can run with the indoor unit or independently. Note that fan may activate independently even when set to run independently on some models.

4. Timer

Timer functions vary by remote controller. Refer to the specific remote controller manual for details.

5. Emergency Operation for IR Wireless Remote Controller

If the remote control unit malfunctions, use the COOL or HEAT button on the IR receiver to turn the unit ON/OFF. For cooling-only units, HEAT toggles the fan.

Pressing COOL or HEAT selects the following settings:

6. Care and Cleaning

Cleaning the Filters

• Clean filters with a vacuum cleaner. If no vacuum is available, tap filters against a solid object to remove dirt and dust.
• For very dirty filters, wash in lukewarm water. Rinse thoroughly and allow to dry completely before reinstalling.
• Caution: Do not dry filters in direct sunlight or with a heat source (e.g., electric heater) as this may warp them. Do not wash filters in hot water (above 122 °F / 50 °C). Ensure filters are always installed; operating without them can cause malfunction.
• Caution: Before cleaning, stop operation and turn off the power supply.
• Indoor units have filters to remove dust from intake air. Clean filters as shown in the following sketches.

Filter Removal

Caution: Protect eyes from dust when removing filters. Be careful if using a stool to reach the filter.

• Do not touch internal metal parts after removing the filter to avoid injury.
• To remove the filter: Lift the filter knob and pull it.

Diagram Description: A diagram shows the filter removal process for the PEAD-A-AA8 unit, indicating Air Intake (A), Air Outlet (B), Filter (C), and Knob (D).

7. Trouble Shooting

Troubleshooting Guide:

(*1: Only for wired remote controller)

8. Specifications

Series PEAD-A-AA8

Notes: 1. External static pressure is set to 0.20 in. WG (50 Pa) at factory shipment.