Fujitsu Halcyon Inverter Room Air Conditioner

Indoor Unit Models:

• ASU18RLXS
• ASU24RLXS
• ASU30RLX

Outdoor Unit Models:

• AOU18RLXS
• AOU24RLXS
• AOU30RLX

Please keep this operation manual for future reference.

Safety Precautions

Read these precautions thoroughly and operate correctly. These instructions relate to safety; maintain safe operating conditions.

• DANGER! Indicates procedures that, if improperly performed, are most likely to result in death or serious injury to the user or service personnel.
• WARNING! Indicates procedures that, if improperly performed, might lead to death or serious injury of the user.
• CAUTION! Indicates procedures that, if improperly performed, might possibly result in personal harm to the user, or damage to property.

Important Safety Instructions:

• Do not attempt to install this air conditioner yourself.
• This air conditioner contains no user-serviceable parts. Always consult authorized service personnel for repairs.
• When moving, consult authorized service personnel for disconnection and installation.
• Do not become excessively chilled by staying for many hours in the direct cooling airflow.
• Do not insert fingers or objects into the outlet port or open panel.
• Do not start and stop air conditioner operation by disconnecting the power supply cord.
• Take care not to damage the power supply cord.
• In case of malfunction (burning smell, etc.), immediately stop operation, turn off the breaker, and consult authorized service personnel.
• If the power supply cord is damaged, it must be replaced by authorized service personnel using special tools and a specified cord.
• Provide occasional ventilation during use.
• Do not direct airflow at fireplaces or heating apparatus.
• Do not climb on, or place objects on, the air conditioner.
• Do not hang objects from the indoor unit.
• Do not set flower vases or water containers on top of air conditioners.
• Do not expose the air conditioner directly to water.
• Do not operate the air conditioner with wet hands.
• Do not pull the power supply cord.
• Turn off power supply when not using the indoor unit for extended periods.
• Check the condition of the installation stand for damage.
• Do not place animals or plants in the direct path of the airflow.
• Do not drink the water drained from the air conditioner.
• Do not use in applications involving the storage of foods, plants or animals, precision equipment, or art works.
• Connection valves become hot during Heating; handle with care.
• Do not apply any heavy pressure to radiator fins.
• Operate only with air filters installed.
• Do not block or cover the open panel and outlet port.
• Ensure that any electronic equipment is at least one meter away from either the indoor or outdoor units.
• Avoid installing the air conditioner near a fireplace or other heating apparatus.
• When installing the indoor and outdoor unit, take precautions to prevent access to infants.
• Do not use inflammable gases near the air conditioner.

Features and Functions

• INVERTER: Uses a large power at the start for quick temperature adjustment, then switches to low power for economic and comfortable operation.
• ECONOMY OPERATION: Limits maximum operation current and suppresses power consumption. Room temperature may be slightly higher (cooling) or lower (heating) than set-temp, saving energy.
• AUTO CHANGEOVER: Automatically switches between cooling, dry, and heating modes to maintain the set temperature.
• MINIMUM HEAT OPERATION: Maintains room temperature at 50°F to prevent it from falling too far.
• PROGRAM TIMER: Allows integration of ON and OFF timer operations in a single sequence within a 24-hour period.
• SLEEP TIMER: Automatically modifies the thermostat setting during operation (lowers in heating, raises in cooling) to prevent excessive warming or cooling during sleep. The unit turns off when the set time elapses.
• WIRELESS REMOTE CONTROLLER: Provides convenient control of air conditioner operation.
• HORIZONTAL AIRFLOW (Cooling): Directs cool air horizontally to avoid blowing directly on occupants.
• DOWNWARD AIRFLOW (Heating): Directs warm air downwards to create a comfortable environment.
• OMNI-DIRECTIONAL AIR FLOW (SWING OPERATION): Allows three-dimensional control of air direction swing (up/down and left/right).
• REMOVABLE INTAKE GRILLE: Allows for easy cleaning and maintenance.
• MILDEW-RESISTANT FILTER: Treated to resist mildew growth for cleaner use.
• SUPER QUIET OPERATION: Reduces indoor unit airflow for quieter operation. Not available in Dry mode.
• POLYPHENOL CATECHIN AIR CLEANING FILTER: Uses static electricity to clean fine particles and dust, and catechin to suppress bacteria growth. This filter is disposable and should be exchanged approximately every three months.
• NEGATIVE AIR IONS DEODORIZING FILTER: Produces negative air ions to deodorize and absorb peculiar smells. These filters should be exchanged approximately every three years and cleaned every three months.
• WIRED REMOTE CONTROLLER (OPTION): An optional controller offering additional functions like weekly timer and temperature set back timer. Cannot be used simultaneously with the wireless remote controller.

Preparation

Turn on the Power

1. Turn on the circuit breaker.

Load Batteries (AAA/R03/LR03 x 2)

1. Press and slide the battery compartment lid on the reverse side to open it.
2. Insert batteries, ensuring correct polarity.
3. Close the battery compartment lid.

Set the Current Time

1. Press the CLOCK ADJUST button (Fig. 6 b14).
2. Use the TIMER SET ( / ) buttons (Fig. 6 b13) to adjust the clock to the current time. (+ button advances time, - button reverses time. Holding buttons changes time in 10-minute increments.)
3. Press the CLOCK ADJUST button (Fig. 6 b14) again to complete the time setting.

To Use the Remote Controller

• The Remote Controller must be pointed at the signal receiver (Fig. 3 a4) to operate correctly.
• Operating Range: About 23ft (7 meters).
• A beeping sound confirms signal reception. If no beep is heard, press the button again.

Remote Controller Holder

Instructions for mounting the holder and setting the remote controller are provided with diagrams.

Operation

To Select Mode Operation

1. Press the START/STOP button (Fig. 6 b8). The OPERATION Indicator Lamp (green) (Fig. 3 a5) will light.
2. Press the MODE button (Fig. 6 b2) to select the desired mode (AUTO, COOL, DRY, FAN, HEAT, MIN.HEAT, ECONOMY).

To Set the Thermostat

• Press the SET TEMP. button (Fig. 6 b12).
• Use the + or - buttons to raise or lower the thermostat setting.
• Thermostat setting range: AUTO, Heating (60-88°F), Cooling/Dry (64-88°F).
• The thermostat cannot be used to set room temperature during FAN mode.
• The thermostat setting is a standard value and may differ from the actual room temperature.

To Set the Fan Speed

• Press the FAN button (Fig. 6 b7) to cycle through fan speeds: AUTO, HIGH, MED, LOW, QUIET.
• AUTO: Fan adjusts automatically for optimal air circulation.
• Heating: Fan operates at very low speed initially, then adjusts based on air temperature.
• Cooling: Fan speed slows as room temperature approaches the set thermostat.
• Fan: Fan runs at low speed.
• SUPER QUIET Operation: Reduces airflow for quieter operation. Not available in Dry mode. May reduce heating/cooling performance.

To Stop Operation

• Press the START/STOP button (Fig. 6 b8). The OPERATION Indicator Lamp (green) (Fig. 3 a5) will go out.

About AUTO CHANGEOVER Operation

• When AUTO CHANGEOVER is selected, the fan operates at low speed for about one minute while the unit detects room conditions and selects the proper operating mode (Cooling/Dry if > +4°F difference, Monitor if ±4°F difference, Heating if < -4°F difference).
• Monitor operation: Fan runs at low speed. Unit resumes operation if room temperature changes.
• If the automatically selected mode is not desired, select the mode manually (HEAT, COOL, DRY, FAN).

About Mode Operation

• Heating: Warms the room. Initial fan speed is low for 3-5 minutes. May enter defrost cycle if outdoor temperature is very low.
• Cooling: Cools the room.
• Dry: Gently cools and dehumidifies. Fan operates at low speed, may stop intermittently. Fan speed cannot be manually changed.
• Fan: Circulates air.
• Note on Thermostat Settings: For Heating, set thermostat higher than room temp. For Cooling/Dry, set lower than room temp.

Timer Operation

To Use the ON timer or OFF timer

1. Press START/STOP (Fig. 6 b8).
2. Press TIMER MODE (Fig. 6 b6) to select OFF, ON, or PROGRAM (OFF → ON, OFF ← ON). The TIMER Indicator Lamp (orange) (Fig. 3 a6) will light.
3. Use TIMER SET ( / ) buttons (Fig. 6 b13) to adjust the desired OFF or ON time.

To Use the Program timer

1. Press START/STOP (Fig. 6 b8).
2. Set desired OFF and ON times as described above.
3. Press TIMER MODE (Fig. 6 b6) to select PROGRAM timer operation (OFF → ON or OFF ← ON will display). The display shows the first timer setting.

• Program Timer Functionality: Integrates OFF and ON timers in a single sequence within a 24-hour period. The first timer to operate is the one set nearest to the current time.
• To Cancel Timer: Use TIMER MODE to select "CANCEL".
• To Change Timer Settings: Follow steps for ON/OFF timer and select desired program.
• To Stop Operation During Timer: Press START/STOP.
• To Change Operating Conditions: After timer settings are confirmed, press appropriate buttons to change Mode, Fan Speed, etc.

Sleep Timer Operation

• The SLEEP timer sets the length of time until the air conditioner stops.
• To Use the SLEEP Timer: Press the SLEEP button (Fig. 6 b5). The OPERATION and TIMER indicator lamps will light.
• To Change Timer Settings: Press SLEEP again and use TIMER SET ( / ) buttons to set the time.
• About the SLEEP Timer: Automatically modifies the thermostat setting to prevent excessive warming or cooling during sleep. The unit stops when the set time elapses.
• During Heating: Thermostat setting is automatically lowered 2°F every 30 minutes, up to a total of 8°F.
• During Cooling/Dry: Thermostat setting is automatically raised 2°F every 60 minutes, up to a total of 4°F.
• To Cancel Timer: Use TIMER MODE to select "CANCEL".
• To Stop Operation During Timer: Press START/STOP.

Adjusting the Direction of Air Circulation

Vertical Air Direction Adjustment

• Use the AIR DIRECTION buttons on the Remote Controller after the unit has started and louvers have stopped moving.
• Press the SET button (Vertical) (Fig. 6 b9). Each press cycles through the vertical air direction settings (1-6).
• Recommended ranges: Cooling/Dry modes (1-3), Heating mode (4-6).
• Vertical airflow direction is set automatically based on the selected operation mode (Horizontal for Cooling/Dry, Downward for Heating).
• During AUTO mode, airflow is horizontal for the first minute and cannot be adjusted.
• Adjusting the louvers manually may cause improper operation; stop and restart the unit if this occurs.
• Caution: Do not set Cooling/Dry modes to the Heating range (4-6) for extended periods, as condensation may form and drip. Louvers will automatically return to position 3 after 30 minutes in this range.
• Consider air direction and room temperature carefully for infants, children, elderly, or sick persons.

Horizontal Air Direction Adjustment

• Press the SET button (Horizontal) (Fig. 6 b10). Each press cycles through the horizontal air direction settings.
• DANGER! Never place fingers or foreign objects inside outlet ports.

Swing Operation

To Select SWING Operation

• Press the SWING button (Fig. 6 b11). The SWING Display (Fig. 7 c7) will light.
• Pressing the button cycles through: Up/down swing, Left/right swing, Up/down/left/right swing, Swing stops.

About Swing Operation

• Up/down swing: Louvers move to direct airflow widely.
• Left/right swing: Louvers move left/right.
• Up/down/left/right swing: Louvers move in both directions.
• Swing may stop temporarily when the fan is not operating or at very low speeds.
• Pressing the SET button during swing operation will stop that direction's swing.

To Stop SWING Operation

• Press the SWING button and select STOP. Airflow direction returns to the previous setting.

Economy Operation

To Use the ECONOMY Operation

• Press the ECONOMY button (Fig. 6 b4). The ECONOMY Indicator Lamp (green) (Fig. 3 a7) will light.

To Stop the ECONOMY Operation

• Press the ECONOMY button (Fig. 6 b4) again. The ECONOMY Indicator Lamp will go out.

About ECONOMY Operation

• Economy operation provides approximately 70% of normal operation output for cooling and heating.
• Improves dehumidification in cooling mode, useful for removing humidity without excessive cooling.
• Thermostat setting automatically adjusts for economical operation.
• If the room is not cooled/heated sufficiently, select normal operation.
• Economy operation is not available during the monitor period in AUTO mode.
• Economy mode may result in slightly higher room temperatures (cooling) or lower temperatures (heating) compared to the set-temp, saving energy.

Minimum Heat Operation

• Press the MIN. HEAT button (Fig. 6 b3) to maintain room temperature at 50°F, preventing it from falling too far.
• The OPERATION indicator lamp will go out, and the ECONOMY indicator lamp will light.
• To Stop: Press the START/STOP button (Fig. 6 b8).
• Heating mode may not operate if the room temperature is already high enough.
• While in MINIMUM HEAT OPERATION, only Airflow Direction Set can be used.

Manual Auto Operation

• Use this operation when the Remote Controller is lost or unavailable.
• How To Use: Press the MANUAL AUTO button (Fig. 2 a2) on the main unit control panel.
• To stop operation, press the MANUAL AUTO button again.
• When using main unit controls, the unit operates in AUTO mode with AUTO fan speed and a standard thermostat setting (76°F).

Cleaning and Care

CAUTION!

• Turn off and disconnect the Power Supply Cord before cleaning.
• Ensure the Intake Grille (Fig. 1 a8) is installed securely.
• Do not touch the heat exchanger when removing/replacing air filters to avoid personal injury.

Cleaning the Intake Grille

1. Remove the Intake Grille by placing fingers at the lower ends and lifting forward. Pull past the intermediate catch and open wide.
2. Clean with water: Remove dust with a vacuum cleaner, then wipe with warm water and dry with a soft cloth.
3. Replace the Intake Grille: Pull knobs, hold grille horizontal, set mounting shafts into bearings, press indicated areas, and close grille.

Cleaning the Air Filter

1. Open the Intake Grille and remove the air filter by lifting the handle and disconnecting tabs.
2. Remove dust with a vacuum cleaner or by washing. Allow to dry thoroughly in a shaded place.
3. Replace the Air Filter and close the Intake Grille: Align filter with panel, push in fully, and ensure tabs are returned to holes.

• Air filters are disposable and cannot be washed or reused.
• Use filters as soon as possible after opening the package for best effect.
• Exchange filters approximately every three months.
• For Negative air ions deodorizing filters, exchange approximately every three years and clean every three months by flushing with high-pressure hot water and mild detergent, then rinsing and drying in shade.
• If dirt accumulates on the air filter, airflow is reduced, lowering efficiency and increasing noise. Clean filters every two weeks during normal use.
• For extended use, have the unit inspected regularly by authorized service personnel.
• When cleaning the unit body, do not use water hotter than 104°F, harsh abrasive cleansers, or volatile agents.
• Do not expose the unit body to liquid insecticides or hairsprays.
• When shutting down for one month or more, allow the fan mode to operate for one-half day to dry internal parts.

Troubleshooting

Before requesting service, perform the following checks:

If problems persist, or if burning smells are noticed, or if indicator lamps flash, stop operation immediately, turn off the breaker, and consult authorized service personnel.

Operating Tips

Operation and Performance

• Heating Performance: Operates on heat-pump principle, absorbing heat from outdoor air. Performance reduced in low outdoor temperatures. May require supplemental heating. Room heating takes time as air is circulated.
• Microcomputer-controlled Automatic Defrosting: Prevents reduced performance due to frost formation on the outdoor unit in low temperatures/high humidity. Unit temporarily stops, defrosting circuit operates (max 15 min). OPERATION Indicator Lamp flashes during defrosting. Unit may start defrosting automatically after heating stops if frost is present.
• AUTO Restart: If power is interrupted by a power failure, the air conditioner will restart automatically in its previous mode when power is restored. If power fails during timer operation, the timer will reset. Use of other electrical appliances or wireless transmitters nearby may cause malfunction; turn off/on the circuit breaker and use the remote controller to resume operation.

Specification

Temperature and Humidity Range

Using the unit outside these ranges may cause protection circuit operation or heat-exchanger freezing, leading to damage.

Do not use for purposes other than cooling, dehumidifying, and air circulation in ordinary dwellings.

High humidity may cause condensation on the indoor unit. Outdoor unit may stop operation in low temperatures for safety.

Specifications Table