DAIKIN

Product Overview

This document is the operation manual for Daikin VRV SYSTEM Inverter Air Conditioners, specifically for the Ceiling-mounted duct type low static pressure unit.

Models covered: FXDQ07MVJU, FXDQ09MVJU, FXDQ12MVJU, FXDQ18MVJU, FXDQ24MVJU.

Important Note: Read these instructions carefully before installation. Keep this manual in a handy place for future reference. This manual should be left with the equipment owner.

Safety Considerations

Meaning of Symbols

• [DANGER]: Indicates an imminently hazardous situation which, if not avoided, will result in death or severe injury.
• [WARNING]: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
• [CAUTION]: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.
• [NOTE]: Indicates a situation that may result in equipment or property-damage-only accidents.

General Safety Warnings

[DANGER] Warnings

• Abnormalities like smoke or fire can cause severe injury or death. Turn off power and contact your dealer immediately.
• Refrigerant gas can produce toxic gas when in contact with fire, potentially causing severe injury or death.
• Refrigerant gas is heavier than air and can cause asphyxiation hazards in enclosed spaces.
• Using equipment with a burner in the same room can lead to oxygen deficiency and asphyxiation. Ensure adequate ventilation.
• Dispose of packing materials safely to prevent injuries from sharp parts. Keep plastic bags away from children to prevent suffocation.
• Do not install in areas with flammable materials due to explosion risk.

[WARNING] Warnings

• Prolonged exposure to airflow can be detrimental to health.
• Professional installation by a dealer is recommended to prevent water leakage, electric shock, and fire.
• Unauthorized improvements, repairs, or maintenance can lead to water leakage, electric shock, and fire.
• Improper installation or attachment of accessories can cause electric shock, short-circuit, leaks, fire, or damage. Use only Daikin-specified accessories, installed by a professional.
• Moving and reinstalling the unit should be done by a dealer to avoid installation issues.
• Never get the indoor unit or remote controller wet to prevent electric shock or fire.
• Avoid using flammable sprays near the unit to prevent fire.
• Never replace fuses with incorrect ratings or use wires as substitutes; this can cause unit breakdown or fire.
• Never remove the fan guard; the high-speed fan is dangerous.
• Do not service the unit yourself; contact a qualified service person.
• Always cut off electric power before maintenance.
• Never sprinkle water or liquids on the unit to avoid electrical shock.
• Operating the unit with wet hands poses a shock hazard.
• Regularly check the unit stand for damage, especially after long use, to prevent the unit from falling.
• Do not place containers with water or liquids on the unit, as spills can cause shock hazards or fire.
• Keep children away from the unit to prevent injury.
• Do not insert fingers or objects into air inlets/outlets; the fan can cause injury.
• Heat exchanger fins are sharp; wear gloves when working around them.
• Ensure proper earthing; do not earth to utility pipes, arresters, or telephone earths. Improper earthing can cause electric shock or fire.
• Install an earth leakage breaker to prevent electric shocks or fire.

[CAUTION] Warnings

• Do not use the air conditioner for purposes other than its intended use (e.g., cooling precision instruments, food, plants, animals, art).
• Do not place items under the indoor unit that could be damaged by condensation, which may form if humidity is high or the drain outlet is blocked.
• Avoid placing the controller where it can be splashed with water, as this can cause electric leaks or damage internal parts.
• Do not operate the air conditioner when using room fumigation-type insecticides, as chemicals can deposit in the unit and affect sensitive individuals.
• Wait at least five minutes after stopping operation before turning off the power to prevent water leakage or other issues.
• The appliance is not intended for use by unsupervised young children or infirm persons.
• Install the remote controller where children cannot play with it.
• Consult an installation contractor for cleaning the inside of the unit; improper cleaning can break plastic parts or cause leaks/shocks.
• Use a stable stool and exercise caution when cleaning.
• Do not place objects near the outdoor unit or allow leaves/debris to accumulate around it, as this can attract small animals that may cause malfunctions or fire.

[NOTE] Warnings

• Never press the remote controller buttons with a hard, pointed object to avoid damage.
• Never pull or twist the remote controller's electric wire to prevent unit malfunction.
• Arrange the drain hose for smooth drainage to prevent wetting of surroundings.
• Do not expose the controller to direct sunlight, as the LCD display may discolor.
• Do not wipe the controller panel with gasoline, thinner, or chemical dustcloths; use a damp cloth with mild detergent for cleaning.

Part Name and Functions

In case of suction from bottom side

Diagram Description: This diagram illustrates the internal components of the indoor unit when air is drawn from the bottom. It shows the airflow duct (local procurement), refrigerant piping, drain pipe, air filter, and air outlet (local procurement). The remote controller and power supply wiring/ground wire through conduit are also indicated.

In case of suction from back side

Diagram Description: This diagram shows the indoor unit configuration for back suction. It includes the airflow duct (local procurement), drain pipe, air outlet (local procurement), refrigerant piping, air filter, remote controller, connection wire, and power supply wiring/ground wire through conduit.

Maintenance

[WARNING] Maintenance Precautions

• Only qualified personnel are permitted to perform maintenance (excluding daily maintenance).
• Always turn off all power supply switches before touching any connection wiring.
• Installation of optional parts must be performed by a qualified person using only company-specified parts to avoid issues like water leakage, electric shock, or fire.

[CAUTION] Cleaning Precautions

• Stop operation and turn off the power switch before cleaning the air conditioner.

Cleaning the Air Filter

Explanation

• Removing the air filter outside of cleaning may cause accidents.
• The filter cleaning indicator [filter-icon] will be displayed on the remote controller when it's time to clean the filter.
• The indicator appears after a designated operating time (default factory setting is 2500 hours). Other display patterns include 1250, 2500, 5000, 10000 hours.
• Increase filter cleaning frequency in dusty environments.
• Consult your dealer to change the time setting for the filter indicator.

Cleaning Procedure

• Step 1: Remove the air filter. (Diagram shows filter removal from bottom/back side units).
• Step 2: Clean it.
  • [CAUTION]: Do not wash with hot water over 120°F (50°C) as it may cause discoloration or deformation.
  • [CAUTION]: Never dry the filter by direct firing; it may burn.
  • Use a vacuum cleaner (A) to remove dust and trash.
  • Alternatively, wash the air filter (B) with water. For very dirty filters, use a soft brush and neutral detergent. Dewater and dry in the shade.
• Step 3: Attach the air filter. (Diagram shows attaching the filter by pushing down on tabs).
• Step 4: Reset the filter indicator. Push the "filter sign reset" button on the remote controller. The display [filter-icon] will vanish.

Cleaning the Air Outlet and Exterior

• Clean with a dry soft cloth.
• For stubborn stains, use water or neutral detergent.
• [WARNING]: Do not let the indoor unit get wet, as it may cause electric shock or fire.
• [CAUTION]: Do not use gasoline, benzene, thinner, polishing powder, or liquid insecticide. Do not use hot water over 120°F (50°C).

Troubleshooting

If the following phenomenon occurs, contact your dealer:

[DANGER] Abnormalities

• Any abnormalities such as smoke or fire can result in severe injury or death. Turn off power and contact your dealer immediately.

Phenomena Requiring Dealer Contact

• Safety devices (fuse, breaker, ground fault interrupter) operate frequently, or operation switches are unstable: Take the following actions before contact: Turn off the switch.
• ON/OFF switch does not work properly: Take the following actions before contact: Turn off the main power switch.
• Water leaks out from the air conditioner: Take the following actions before contact: Stop the operation.
• Indicators on Remote Controller: If the “OPERATION lamp”, “INSPECTION display”, or “UNIT No." is blinking/lit, and a "MALFUNCTION CODE" is displayed: Take the following actions before contact: Inform the dealer of the details displayed on the remote controller. (Diagram shows remote controller with labels for OPERATION lamp, INSPECTION display, UNIT No., MALFUNCTION CODE, and indicates the indoor unit number where malfunction occurs).

Company Information

DAIKIN INDUSTRIES, LTD.

Head office: Umeda Center Bldg., 2-4-12, Nakazaki-Nishi, Kita-ku, Osaka, 530-8323 Japan

Tokyo office: JR Shinagawa East Bldg., 2-18-1, Konan, Minato-ku, Tokyo, 108-0075 Japan

Certification: ETL LISTED US

Document Number: 3PN05140-16W