MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2 (01) PDF Document

To ensure safe operation of your MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2, please adhere to the following warnings:

• The unit is for appliances not accessible to the general public and must not be installed by the user. Ask the dealer or an authorized company to install the unit to prevent water leakage, electric shock, or fire.

• Do not stand on, or place any items on the unit.

• Do not splash water over the unit and do not touch it with wet hands, as an electric shock may result.

• Do not spray combustible gas close to the unit to avoid a fire hazard.

• Do not place a gas heater or any other open-flame appliance where it will be exposed to the air discharged from the unit, as this may result in incomplete combustion.

• Do not remove the front panel or the fan guard from the outdoor unit when it is running.

• Never attempt to repair the unit or transfer it to another site by yourself.

• If you notice exceptionally abnormal noise or vibration, stop the operation, turn off the power switch, and contact your dealer.

• Never insert fingers, sticks, or other objects into the intakes or outlets.

• If you detect odd smells, stop using the unit, turn off the power switch, and consult your dealer to prevent 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 refrigeration gas leaks, stop the operation of the air conditioner, thoroughly ventilate the room, and contact your dealer.

• When installing, relocating, or servicing the air conditioner, use only the specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any other refrigerant and do not allow air to remain in the lines. Using a different refrigerant can cause mechanical failure, system malfunction, or unit breakdown.

Please observe the following cautions to prevent damage to your MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2:

• Do not use any sharp object to push the buttons, as this may damage the remote controller.

• Never block or cover the indoor or outdoor unit’s intakes or outlets.

• Never wipe the remote controller with benzene, thinner, chemical rags, etc.

• Do not operate the unit for a long time in high humidity (e.g., by leaving a door or window open). In cooling mode, operating in a room with high humidity (80% RH or more) for a long time may cause condensed water to drop from the unit and damage furniture.

• Do not touch the upper air outlet vane or the lower air outlet damper during operation. Otherwise, condensation may form and the unit may stop operating.

When you need to dispose of the MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2 unit, consult your dealer.

The MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2 indoor unit consists of an air outlet, filter, air intake, and vane.

The Simple MA Remote Controller features:

• Controller Interface: Backlit LCD, ON/OFF lamp, ON/OFF button, TEMP. buttons (up/down), FAN button, MODE button, and VANE button.

• Display Icons:

• CENTRAL icon: Appears when a local operation (ON/OFF, mode, temperature, fan speed, vane) is prohibited by a central controller.

• CHECK icon: Appears when an error occurs. The unit address and error code will blink.

• Energy-save mode icon.

• Operation lock icon.

• Indoor unit function setup icon (F).

• Fan speed icon.

• Vane icon.

• Power on icon.

• Preset Temperature: Shows the current temperature setting.

• Indoor Temperature: Shows the current room temperature.

• Operation Modes: AUTO, COOL, HEAT, FAN, DRYING, VENTI, SETBACK.

Pressing the MODE button on the remote controller for your MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2 will cycle through the operation modes in the following order: COOL → DRYING → FAN → AUTO → SETBACK → HEAT. Note that not all functions are available on all models, and unavailable functions will not appear on the display.

• AUTO (dual set point) mode: In this mode, you can set preset temperatures for both cooling and heating. The unit will automatically switch between cooling and heating operations depending on the room temperature to maintain comfort.

• SETBACK mode: This function automatically switches the operation mode between cooling and heating to maintain the room temperature within the set temperature range. The preset temperatures for cooling and heating in SETBACK mode can be set differently from the preset temperatures for other modes.

In COOL, DRYING, HEAT, and AUTO (single set point) modes:

• Press the TEMP ▲ button to increase the preset temperature.

• Press the TEMP ▼ button to decrease the preset temperature.

In AUTO (dual set point) and SETBACK modes:

1. Press the TEMP ▲ or TEMP ▼ button. The preset temperature display for both cooling and heating will start blinking.

2. While the display is blinking, pressing TEMP ▲ increases both preset temperatures, and pressing TEMP ▼ decreases both.

3. To adjust cooling and heating temperatures individually, press the MODE button. Only the cooling preset temperature will blink. Use the TEMP ▲ and TEMP ▼ buttons to set the desired cooling temperature.

4. Press the MODE button again. Now, only the heating preset temperature will blink. Use the TEMP ▲ and TEMP ▼ buttons to set the desired heating temperature.

5. Press the MODE button one more time to complete the setting.

Note: The setting process will automatically end if the temperature buttons are left untouched for a certain period.

The preset temperature ranges for your MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2 are as follows:

*1 The preset temperatures for cooling and heating for AUTO (dual set point) mode will be used for those for COOL/DRYING and HEAT mode.

*2 The preset temperatures for cooling and heating can be set under the following conditions:

• The cooling preset temperature is greater than the heating preset temperature.

• The difference between the cooling and heating preset temperatures is equal or greater than the minimum temperature difference that varies depending on the indoor unit model to be connected.

Pressing the FAN button on the remote controller will change the fan speed of your MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2. The available speeds vary depending on the indoor unit model. If your unit does not have a fan setting function, the fan icon will blink when the FAN button is pressed, and the speed cannot be set.

Pressing the VANE button on the remote controller will switch the vane directions through various settings, including AUTO and Swing. The settable vane directions vary depending on the indoor unit model. If your unit does not have a vane function, the vane icon will blink when the VANE button is pressed, and the direction cannot be set.

To restrict the preset temperature range for different operation modes on your MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2, follow these steps:

1. Press the ON/OFF button to stop the air conditioning unit.

2. Press and hold the FAN button for three seconds or longer. The temperature range restriction setting display will appear.

3. Press the MODE button to select a restriction option:

• A. No temperature range restriction.

• B. Restrict the preset temperature range for COOL/DRYING, AUTO (dual set point), and SETBACK modes.

• C. Restrict the preset temperature range for HEAT, AUTO (dual set point), and SETBACK modes.

• D. Restrict the preset temperature range for AUTO (single set point) mode.

4. Press the FAN button to switch between setting the upper limit (Hi) and the lower limit (Lo).

5. Press the TEMP ▲ or TEMP ▼ button to set the desired upper or lower limit value.

6. Press and hold the FAN button for three seconds or longer to complete the setting. After the restriction is set, if a user tries to select a temperature outside of the range, the preset temperature display will blink.

Before cleaning, always stop the operation and turn OFF the power supply. It is recommended to have authorized personnel clean the filter.

Cleaning the filters:

• Clean the filters using a vacuum cleaner. If a vacuum cleaner is not available, tap the filters against a solid object to knock off dirt and dust.

• If the filters are especially dirty, wash them in lukewarm water. Be sure to rinse off any detergent thoroughly and allow the filters to dry completely before putting them back into the unit.

Cautions for cleaning:

• Do not dry the filters in direct sunlight or with a heat source like an electric heater, as this may warp them.

• Do not wash the filters in hot water (above 50°C, 122°F), as this may warp them.

• Ensure the air filters are always installed. Operating the unit without air filters can cause a malfunction.

Filter Removal Steps for PLFY-P-NBMU-E2 Series:

1. Pull the knob on the intake grille in the direction indicated by the arrow to open it.

2. Open the intake grille fully.

3. Release the knob on the center edge of the intake grille and pull the filter forward to remove it.

If your MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2 is not heating or cooling well, check the following, as these are part of normal operation:

• Clean the filter. Airflow is reduced when the filter is dirty or clogged.

• Check the temperature setting. Adjust the set temperature as needed.

• Check for obstructions. Make sure there is plenty of space around the outdoor unit and that the indoor unit’s air intake or outlet is not blocked.

• Close doors and windows. Check if a door or window has been left open.

This is normal for the MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2. Warm air will not blow until the indoor unit has sufficiently warmed up.

This is a normal function. When the outdoor temperature is low and humidity is high, frost may form on the outdoor unit. When this occurs, the unit performs a defrosting operation to remove the frost. Normal operation should resume after approximately 10 minutes.

This is part of the unit’s automatic operation to ensure efficiency and comfort:

• During cooling mode: The vanes automatically move to the horizontal position after 1 hour if the down airflow direction is selected. This is to prevent water from forming on and dripping from the vanes.

• During heating mode: The vanes automatically move to the horizontal airflow direction if the airflow temperature is low or during a defrosting cycle.

No, this is normal. These sounds can be heard when refrigerant is flowing within the air conditioner or when the refrigerant flow is changing.

This is normal. These sounds are caused by plastic and metal parts expanding and contracting due to temperature changes.

This is not a malfunction. The indoor unit can draw in air that contains odors from walls, carpeting, furniture, and clothing, and then circulate this air back into the room.

This can be normal under certain conditions:

• If the indoor temperature and humidity are high, this may occur when the operation starts.

• During the defrosting mode, cool airflow may blow down and appear like a mist.

This is normal operation under certain conditions:

• During cooling mode, water (condensation) may form and drip from the cool pipes and joints.

• During heating mode, water (condensation) may form and drip from the heat exchanger.

• During defrosting mode, water on the heat exchanger evaporates, and this water vapor may be emitted.

The power switch for the indoor unit may be turned off. Turn on the power switch, and the power icon should appear on the remote controller display.

This message indicates the unit is under central control from a master controller. When “(CENTRAL)” is displayed, the air conditioner cannot be started or stopped using the local remote controller.

This is a protective feature of the MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2. The operation is temporarily stopped to protect the air conditioner’s components. Please wait approximately three minutes before attempting to restart the unit.

This could be due to a few reasons:

• The air conditioner might be connected to a central remote controller that is controlling its operation. Consult the person responsible for the central control system.

• The “auto recovery from power failures” feature may be set, which automatically restarts the unit after a power outage. You can press the ON/OFF button to stop the operation.

• If “(CENTRAL)” appears on the remote controller display, the unit is being controlled centrally.

This is normal. It means the initial settings are being performed. Please wait approximately 3 minutes for the process to complete.

An error code indicates that the unit’s protection devices have been activated. Do not attempt to repair the equipment yourself. Turn off the power switch immediately and consult your dealer. Be sure to provide the dealer with the model name and the exact error code that appeared on the remote controller display.

Yes, this is normal. When the cooling operation stops, the drain pump operates to remove condensation and then stops. Please wait approximately 3 minutes for this process to finish.

The operating sound level is affected by the acoustics of the room where it is installed. The noise specifications are measured in an echo-free room. In a normal room with furniture and hard surfaces, the sound level will be higher than the specification due to sound reflection. The perceived noise level can vary depending on the room’s sound-absorbing properties.

This can happen if another indoor unit in the same system is operating in heating mode. The control valve on your unit may open and close occasionally to maintain stability in the overall air conditioning system. This operation will stop after a while. If this causes an undesirable rise in the room temperature, you can temporarily stop the operation of the indoor unit.

Using your MITSUBISHI ELECTRIC CITY MULTI PLFY-P12NBMU-E2 outside of the specified range can result in serious failure. The recommended relative humidity for both indoors and outdoors is between 30% and 80%.

If your air conditioner operates but does not cool or heat the room, there may be a refrigerant leak. You should consult your dealer. When repairs are carried out, be sure to ask the service representative if a refrigerant leak was found and fixed. The refrigerant used is normally safe and does not leak; however, if a leak occurs indoors and the gas comes into contact with a heat source like a fan heater, space heater, or stove, harmful substances can be generated.

*1 Cooling/Heating capacity indicates the maximum value at operation under the following condition:

Cooling: Indoor 27 °C DB, 81 °F DB/19 °C WB, 66 °F WB, Outdoor 35 °C DB, 95 °F DB

Heating: Indoor 20 °C DB, 68 °F DB, Outdoor 7 °C DB, 45 °F DB/6 °C WB, 43 °F WB

*2 This figure () indicates panel’s.