General Assist Operating Guide
ASTG07CMCB / ASTG09CMCB / ASTG12CMCB
Built-in Wireless LAN: These models include a built-in WLAN adapter for wireless LAN control. Refer to the Wireless LAN setting manual or mobile app for setup and troubleshooting.
Operation, timers, energy saving, cleaning and troubleshooting
Wall mounted R32 cooling-only air conditioner
Quick answer: The ASTG07CMCB, ASTG09CMCB and ASTG12CMCB are cooling-only wall mounted systems. The supplied wireless remote controller provides AUTO, COOL, DRY and FAN modes together with Powerful, Economy, Human Sensor energy saving, Outdoor Unit Low Noise and timer functions.
Safety: These units use R32 refrigerant. Installation, repair and relocation must be carried out by authorised service personnel. If the unit smells of burning, emits smoke or leaks water, stop operation and isolate the power supply.
1. Quick operation
| Step | Action |
|---|---|
| 1 | Press START/STOP. |
| 2 | Press MODE to select AUTO, COOL, DRY or FAN. |
| 3 | Use the TEMP buttons to select the required temperature when using AUTO, COOL or DRY. |
| Mode | Temperature setting range |
|---|---|
| AUTO / COOL / DRY | 18 to 30 °C |
| FAN | Temperature control is not available. |
Cooling-only model: These models do not provide a HEAT operating mode. The MODE selection sequence is AUTO → COOL → DRY → FAN.
2. Main remote controller functions
| Function | What it does |
|---|---|
| FAN | Selects AUTO, HIGH, MED, LOW or QUIET fan speed. |
| POWERFUL | Runs the unit at maximum power and strong airflow for rapid cooling. It turns off automatically after the room reaches the set temperature following a minimum run period, or after 20 minutes. |
| ECONOMY | Reduces energy use by operating at a moderated temperature. Maximum output is approximately 70% of normal operation in COOL or DRY. |
| SWING | Starts or stops automatic vertical louvre swing. |
| SET | Adjusts the vertical airflow direction. |
| OUTDOOR UNIT LOW NOISE | Reduces compressor rotation and outdoor fan speed to lower outdoor unit noise. The setting is retained after the indoor unit is stopped. |
| SENSOR | Turns the Human Sensor Energy Saving program on or off. |
Airflow direction and Power Diffuser
- The vertical airflow louvre has seven positions.
- In COOL or DRY, positions 1–3 are the suggested range. If positions 4–7 are used for more than 30 minutes, the louvre automatically returns to position 3 to reduce the risk of condensation.
- The Power Diffuser moves in conjunction with the vertical airflow louvre during normal positioning. During SWING operation, the Power Diffuser does not move.
- The horizontal airflow direction is adjusted manually using the two louvre knobs. Stop the vertical louvre before adjusting the horizontal louvres.
- Do not manually force the vertical airflow louvre.
Remote controller range
- Aim the remote controller at the indoor unit signal receiver.
- Operating range is approximately 7 metres.
- A beep confirms that the indoor unit has received the signal.
- Direct sunlight, strong lighting, curtains or walls can interfere with signal transmission.
3. Timer operation
Before setting timers, make sure the day and clock on the remote controller are correct.
ON / OFF timer
- Press TIMER SETTING.
- Use SELECT to choose ON timer or OFF timer.
- Press NEXT.
- Set the required time with SELECT. A short press changes the time by 5 minutes; holding the button changes it by 10 minutes.
- Press SEND while close to the indoor unit.
To cancel, press the ON/OFF timer button while the timer indicator is shown.
Program timer
The Program timer combines one ON timer and one OFF timer within a 24-hour period. The event closest to the current time operates first.
Sleep timer
The Sleep timer helps reduce excessive cooling while sleeping. During COOL or DRY operation, the set temperature is automatically raised as the timer progresses, then the unit stops when the selected time expires.
Available durations are 0.5, 1, 2, 3, 5, 7 or 9 hours.
Weekly timer
- Up to 4 ON/OFF reservations per day can be programmed.
- Up to 28 reservations per week are available.
- An ON program can include a temperature setting from 18 to 30 °C.
- The Weekly timer cannot be used at the same time as the ON/OFF, Program or Sleep timer.
- If power is interrupted, the timer clock may become incorrect. Reset the clock and timer if the TIMER indicator blinks after power is restored.
4. Energy saving and Demand Response
Human Sensor Energy Saving
The Energy Saving program is enabled at the time of purchase. Press SENSOR to turn the function on or off.
| Condition | Energy Saving response |
|---|---|
| No person detected for approximately 20 minutes in COOL / DRY | The set temperature is increased by up to approximately 2 °C. |
| AUTO | Energy Saving operates automatically according to the selected cooling or drying operation. |
| Person returns | The unit returns to the original settings. |
The Human Sensor detection range is approximately 7 m, with a 90° vertical range and 100° horizontal range. Detection can be affected by room temperature, lack of movement, furniture, glass, pets, moving curtains and other heat sources.
Demand Response
| DR mode | Operation |
|---|---|
| DR1 | Compressor off. |
| DR2 | Cooling continues, with electrical energy consumption limited to no more than 50% of rated energy consumption over a 30-minute period. |
| DR3 | Cooling continues, with electrical energy consumption limited to no more than 75% of rated energy consumption over a 30-minute period. |
Demand Response note: Cooling performance may reduce while a DR mode is active. The temperature setting cannot override the demand response. If the unit is behaving this way, confirm whether the electricity supplier is activating Demand Response.
5. Normal operating behaviours
| Behaviour | Explanation |
|---|---|
| Unit does not restart immediately | A compressor protection delay of approximately 3 minutes can occur after a sudden power OFF/ON. |
| Refrigerant flow or light squeaking noises | These can be normal sounds caused by refrigerant flow and thermal expansion or contraction. |
| Mist from indoor unit in COOL / DRY | Can occur when room air is rapidly cooled and condensation forms. |
| Airflow is weak or stops in DRY | The indoor fan operates at low speed to control humidity and may stop from time to time. |
| Airflow is very low in QUIET | QUIET mode intentionally reduces fan speed and airflow. |
| Indoor fan stops at times in COOL | The indoor fan may stop from time to time when the outdoor unit is stopped. |
| Very low fan speed in AUTO | During monitoring operation in AUTO mode, the fan can rotate at very low speed. |
6. Cleaning and maintenance
Before cleaning: Stop the indoor unit and disconnect the power supply. Do not touch the aluminium heat exchanger fins and do not work from an unstable surface.
Air filters
- Open the intake grille.
- Lift the filter handle, release the two claws and slide the filter down and out.
- Remove the filter holder and air cleaning filter from the rear of the main air filter.
- Vacuum the main air filter or wash it using neutral household detergent and warm water.
- If washed, dry the filter thoroughly in shade.
- Refit the air cleaning filter and holder, reinstall the main air filter and ensure both claws locate correctly.
- Close the intake grille completely.
Under normal use, clean the air filters approximately every 2 weeks.
Air cleaning filters
| Filter | Part number | Maintenance |
|---|---|---|
| Apple-Catechin Filter | UTR-FA16 | Disposable. Do not wash or reuse. Replace approximately every 3 months under normal use. |
| Ion Deodorization Filter | UTR-FA16-2 | Clean approximately every 3 months and replace approximately every 3 years under normal use. |
After the indoor unit has been unused for one month or more, operate it in FAN mode for approximately half a day to dry the internal parts before returning to normal use.
Filter indicator reset
After cleaning, press the indoor unit MANUAL AUTO button for less than 3 seconds to reset the filter indicator.
7. Troubleshooting
| Symptom | Check |
|---|---|
| Does not operate | Check the circuit breaker, power supply, fuse and timer setting. |
| Poor cooling | Check dirty filters, blocked intake/outlet, temperature setting, open doors/windows, direct sunlight, other heat sources, QUIET fan speed, Outdoor Unit Low Noise and Demand Response. |
| Remote controller does not operate as expected | Check that the batteries are installed correctly and are not exhausted. |
| Operation delayed after restart | A compressor protection delay of approximately 3 minutes is normal after power is turned off and back on suddenly. |
Stop operation and isolate power immediately if the unit smells of burning, emits smoke, leaks water, or if the problem continues after the checks above. Arrange authorised service if the OPERATION and TIMER indicators blink while the ECONOMY indicator is blinking rapidly.
Manual Auto operation
| Indoor unit status | MANUAL AUTO press | Result |
|---|---|---|
| Operating | More than 3 seconds | Stop |
| Stopped | More than 3 seconds and less than 10 seconds | AUTO operation |
| Stopped | More than 10 seconds | Forced cooling - service use only |
| After cleaning | Less than 3 seconds | Filter indicator reset |
8. Indoor operating limits
| Operation | Indoor condition |
|---|---|
| COOL / DRY | Approximately 18 to 32 °C; indoor humidity below approximately 80%. |
Source: Operating Manual Part No. 9333003023 for ASTG07CMCB, ASTG09CMCB and ASTG12CMCB.