Mitsubishi Electric PAR-F27MEA Instruction Book

1 Safety Precautions

The following symbols are used to denote dangers that may be caused by incorrect use and their degree:

[WARNING] This symbol denotes what could lead to serious injury or death if you misuse the Controller.

[CAUTION] This symbol denotes what could lead to personal injury or damage to your property if you misuse the Controller.

WARNING Precautions

• Ask your dealer or technical representative to install the unit. Any deficiency caused by your own installation may result in an electric shock or fire.
• Securely install the controller in a place which can withstand its weight. If not, the controller may drop and cause injury.
• Make sure that the controller is connected to a rated power supply. Using an incorrect power supply may cause a fire or damage to the controller.
• Stop the operation immediately if any malfunction occurs (e.g., burning smell). Turn off the power supply and contact your dealer or technical representative. Continued operation after a malfunction may cause damage, electric shock, or fire.
• Do not move or re-install the controller yourself. Any deficiency caused by improper installation may result in electric shock or fire. Consult your distributor or a special vendor for moving and installation.
• To dispose of this product, consult your dealer.
• Never modify or repair the controller yourself. Any deficiency caused by modification or repair may result in electric shock or fire. Consult your dealer for repairs.
• Stop the operation immediately and notify your dealer if an error code is displayed or a malfunction occurs. Operating the controller in this condition may cause fire or damage.

CAUTION Precautions

• Do not install in any place exposed to flammable gas leakage. Accumulated flammable gases may cause an explosion.
• Do not wash with water. This may cause an electric shock or malfunction.
• Do not touch any control button with wet hands. This may cause an electric shock or malfunction.
• Do not use the controller for special applications. This product is designed for the CITY MULTI CONTROL SYSTEM. Using it for other air conditioning management operations or applications may cause malfunctions.
• Do not apply insecticide or flammable sprays to the controller. Do not place flammable sprays near the controller, and ensure they do not blow directly onto it, as this may cause fire.
• Do not clean the unit using benzene, thinner, or other chemicals. This may cause discoloration or other damage. If the unit becomes particularly dirty, apply a mild cleaner diluted with water to a soft cloth and wipe the unit clean. Be sure to wipe away any residual moisture with a dry cloth.
• Do not use in any special environment. Using the controller in places exposed to oil (including machine oil), steam, or sulfuric gas may significantly deteriorate performance or damage component parts.
• Do not press any control button using a sharp object. This may cause an electric shock or malfunction.
• Operate the controller within the specified temperature range. Using the controller outside this range may cause serious damage. Refer to the operation manual for the specified temperature range.
• Do not pull or twist the transmission line. This may cause fire or malfunction.
• Do not dismantle the unit. Touching the internal circuit board is dangerous and may cause fire or malfunction.

2 Part Names

The remote controller has various display elements and buttons. Below is a description of each part:

Display Section

The display section shows the current operating status and settings.

Operation Section (Buttons)

The operation section contains buttons for controlling the air conditioner.

• ON/OFF lamp
• ON/OFF button: Turns the unit on or off.
• TEMP. buttons: ▲ (Raise) and ▼ (Lower) to adjust the set temperature.
• Timer selection button: Selects timer modes.
• Mode selection button: Selects the operation mode (e.g., Cool, Heat, Fan).
• Time selection buttons: Return (▽) and Ahead (△) for time adjustments.
• FILTER button: Used for filter reset.
• CHECK button: (Normally not used).
• TEST RUN button: (Normally not used).
• Airflow button: Adjusts airflow direction.
• Louver button: Controls louver swing.
• Ventilation button: Controls fan speed and operation.

NOTE: When an operation button is pressed, if the indoor unit does not have that function, "NOT AVAILABLE" flashes. If one remote controller manages multiple indoor units, this message is not displayed if the master indoor unit has the selected function.

3 How to Operate

This section details how to operate the remote controller for various functions.

3.1 On/Off and Operation Mode Selection

When starting operation: Press the ON/OFF button. The ON/OFF lamp and display will light up.

When stopping operation: Press the ON/OFF button. The ON/OFF lamp and display will turn off.

When selecting the operation mode: While the air conditioner is operating, press the Mode selection button. The setting switches each time the button is pressed. The selected operation mode is displayed.

NOTE: Auto and heating functions may not be installed, depending on the outdoor unit model.

3.2 Room Temperature Adjustment

When you want to change the set temperature:

• To lower the room temperature: Press the TEMP. (▼) button.
• To raise the room temperature: Press the TEMP. (▲) button.

The set temperature changes by 1°C each time the button is pressed and is displayed on the Set temperature display.

The following specified temperatures can be set:

Room Temperature Display

During operation, the intake temperature is displayed. The display range is 8 to 39 °C. If this range is exceeded, the display will flash at 8 °C or 39 °C.

NOTES:

• When multiple indoor units are controlled, the contents of the master indoor unit are displayed.
• The room temperature sensor position can be selected from "INDOOR UNIT" and "REMOTE CONTROLLER". The initial setting is "INDOOR UNIT". To change to "REMOTE CONTROLLER", consult your dealer.
• If "no room temperature display" was selected via function settings, the room temperature will not be displayed.

3.3 Wind Speed and Wind Direction Adjustment

When you want to change the wind speed: While the air conditioner is operating, press the Wind speed button. Each press changes the setting.

The wind speed is displayed. The selectable wind speeds depend on the model:

NOTES: Wind speed display may differ from the unit in certain conditions like "HEAT STAND BY", "DEFROSTING", immediately after heating operation, or when room temperature is higher than set temperature in heating mode. Dry operation also has specific conditions.

When you want to change the wind direction: While the air conditioner is operating, press the Airflow button. Each press changes the setting.

The wind direction is displayed. The selectable wind directions are:

For Heat/Fan mode, options include High/Mid1/Mid2/Low speeds and Horizontal/Downward directions. For Cool/Dry mode, options include Horizontal outlet, Downward 45°, 60°, 85°, and Horizontal after 1 hour. Fan operation defaults to horizontal after one hour.

NOTE: Airflow vane position may not synchronize with the remote controller display during swing operation. Some models may not have an airflow function.

NOTE: Unit airflow display may differ from the remote controller in conditions like "HEAT STANDBY", "DEFROSTING", or when room temperature is higher than set temperature in HEAT mode.

3.4 Fan Operation

When operating fan interlocked with indoor unit: When the indoor unit is operated, the fan operates automatically. Fan operation is displayed.

When operating fan only while indoor unit is stopped: While the air conditioner is stopped, press the Ventilation button. The ON/OFF lamp lights, and fan operation is displayed.

When you want to change the fan wind speed: Press the Ventilation button. Each press changes the wind speed.

The display shows options like "Off" (no display) or specific speed settings. If "NOT AVAILABLE" is displayed when the Ventilation button is pressed, the fan is not interlocked.

3.5 Timer Operation

There are three timer modes:

1. 1 day timer mode: Allows setting ON and OFF timers (10-minute units) once within a 24-hour period. Options include ON timer only, OFF timer only, or ON/OFF timer.
2. Daily timer mode: Similar to the 1 day timer mode, but timer operations can be set for the same time each day.
3. Auto off timer mode: Allows setting the OFF timer in 30-minute units (30 minutes to 4 hours). When the remaining time reaches 0:00, the air conditioner stops. This mode is useful for automatically turning off the unit if forgotten.

NOTE: Timer operation may not be executed if restricted by a central controller. If ON/OFF operation was restricted during AUTO OFF timer operation, the remaining time is memorized and the unit stops after that memorized time from the restriction removal.

4 Other Displays and Flashing Indicators

The remote controller uses various displays and flashing indicators to communicate status and potential issues.

"CENTRALLY CONTROLLED" Display

Displayed when operation is controlled by a central controller. Restricted operations include ON/OFF (including timer operation), operation mode, and set temperature. These restrictions may also be individual.

"Operation mode" Flashing

When flashing continuously: Displayed when another indoor unit connected to the outdoor unit is already operating in a different mode. Ensure the operation mode matches that of the other indoor unit.

When mode switched after display flashes: Displayed when operation mode is restricted for each season by a central controller, etc. Use another operation mode.

"FILTER" Flashing

Indicates that the filter needs cleaning. Clean the filter.

When resetting "FILTER" display: Press the FILTER button twice successively after cleaning the filter. The display will go off and reset.

NOTES: The filter cleaning period may differ based on the type of indoor unit. "FILTER" is displayed when the master unit's cleaning period arrives. The cumulative time resets when the display goes off. The "FILTER" indicator shows the cleaning period based on general indoor air conditions; clean the filter more frequently if environmental conditions are harsh. The cumulative time differs by model.

"ERROR CODE" Flashing

When both the "ON" lamp and "ERROR CODE" flash: A trouble has occurred in the air conditioner, and it stops operation. Note down the unit number and error code, turn off the air conditioner power, and consult your dealer.

When only "ERROR CODE" flashes (ON lamp remains steady): The air conditioner continues to operate, but there is a possibility of trouble. Note down the error code and consult your dealer.

5 How to Select Remote Controller Functions

In the remote controller function selection mode, three functions can be selected and changed.

1) Operation mode display selection mode (Automatic mode cool/heat display selection)

When AUTO operation mode is set, the indoor unit determines cooling or heating automatically. The display shows "AUTO" "COOL" or "AUTO" "HEAT". "AUTO" can also be displayed alone.

OPERATION MODE DISPLAY SELECTION MODE (When you want to change the AUTO mode display): This setting is unavailable if the controller is connected to an air conditioner without AUTO mode. "AUTO" "COOL/HEAT" flashes, and "ON" or "OFF" lights. Pressing the Time selection (△) or (▽) button switches between "ON" and "OFF" display.

• When "ON" is selected: "AUTO" "COOL" or "AUTO" "HEAT" is displayed during AUTO mode operation.
• When "OFF" is selected: Only "AUTO" is displayed during AUTO mode operation.

2) Room temperature display selection mode (Room temperature display/no display selection)

Normally, the intake temperature is displayed. This setting allows disabling the display.

ROOM TEMPERATURE DISPLAY SELECTION MODE (When you want to change room temperature display/no display): "88 °C" flashes at the room temperature display, and "ON" or "OFF" lights. Pressing the Time selection (△) or (▽) button switches between "ON" and "OFF" display.

• When "ON" is selected: The room temperature is continuously displayed.
• When "OFF" is selected: The room temperature is not displayed.

To exit function selection mode, press the CHECK and Mode selection buttons simultaneously for two seconds.

6 Specifications

MITSUBISHI ELECTRIC CORPORATION