GENERAL Assist Technical Reference

ASTG18KMCB / ASTG22KMCB / ASTG24KMCB

Operating guide, timer setup, airflow, energy-saving functions and troubleshooting
Wall mounted R32 air conditioners with built-in Wireless LAN control
This guide covers the main user functions for ASTG18KMCB, ASTG22KMCB and ASTG24KMCB indoor units, including basic operation, motorised vertical and horizontal airflow, timers, Human Sensor energy saving, Demand Response, built-in Wireless LAN control and common troubleshooting checks.
R32 refrigerant: Installation, servicing and relocation must only be carried out by qualified personnel. If there is a burning smell, smoke, refrigerant leakage or water leakage, stop operation, isolate the power supply and arrange service.

1. Quick start

StepAction
1Press START/STOP.
2Press MODE to select AUTO, COOL, DRY, FAN or HEAT.
3Use the temperature buttons to select the required set temperature.
ModeTemperature setting range
AUTO / COOL / DRY18.0–30.0 °C
HEAT16.0–30.0 °C
FANTemperature setting is not available.
Heating start-up: The indoor fan may run at very low speed for approximately 3–5 minutes while the unit warms internally. Automatic defrost can also temporarily override heating operation.

2. Fan speed and airflow direction

Fan speed: AUTO → HIGH → MED → LOW → QUIET. In AUTO, the fan speed is adjusted automatically according to operating conditions.

Vertical airflow: Use the Vertical SET button. The unit has 8 vertical positions. In COOL or DRY, positions 5–8 should not be left selected for more than 30 minutes because the unit will automatically return to position 4 to reduce condensation risk.
Horizontal airflow: Use the Horizontal SET button. The louvre has 5 horizontal positions and is motorised.

SWING: Repeatedly press SWING to cycle through Up/Down, Left/Right, Up/Down + Left/Right, and Stop Swing.

3. Special operating functions

FunctionWhat it does
POWERFULRuns the system at high output and strong airflow for rapid heating or cooling. It automatically ends after approximately 20 minutes or when operating conditions are satisfied. It cannot operate with ECONOMY.
10 °C HEATMaintains the room at approximately 10 °C to help prevent the room becoming excessively cold. The ECONOMY indicator illuminates during this mode.
ECONOMYModerates the set temperature to reduce power consumption. Maximum output is approximately 70% of normal operation in COOL, HEAT or DRY.
OUTDOOR UNIT LOW NOISEReduces compressor speed and outdoor fan speed to lower operating noise. It cannot operate at the same time as FAN, DRY or POWERFUL.

Human Sensor energy saving

The Energy Saving Program is enabled at the time of purchase. If no person is detected for approximately 20 minutes, the set temperature is adjusted automatically:

  • COOL / DRY: up to approximately 2 °C higher.
  • HEAT: up to approximately 4 °C lower.
  • AUTO: adjusts according to the active operating mode.

When movement is detected again, the unit returns to the original setting. The sensor detection range is approximately 7 m, 90° vertically and 100° horizontally.

Demand Response

DR modeOperation
DR1Compressor off.
DR2Energy consumption is limited to no more than 50% of rated consumption over a 30-minute period.
DR3Energy consumption is limited to no more than 75% of rated consumption over a 30-minute period.
During a Demand Response event, heating or cooling performance may be reduced and the function cannot be overridden by changing the set temperature. If operation appears limited unexpectedly, first confirm whether the electricity supplier is activating Demand Response.

4. Timer operation

The remote controller supports ON timer, OFF timer, Program timer, Sleep timer and Weekly timer. Set the current day and time before using timer functions.

ON / OFF timer

  1. Press TIMER SETTING.
  2. Use SELECT to choose ON or OFF.
  3. Press NEXT.
  4. Set the required time using SELECT.
  5. Press SEND while close to the indoor unit.

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

Available durations are 0.5, 1, 2, 3, 5, 7 or 9 hours. The set temperature is adjusted gradually before the air conditioner switches off.

Weekly timer

Up to 4 programs per day can be set, for a maximum of 28 programs per week. Each program can be set as ON, OFF or no timer. An ON event can also include a temperature setting.

The Weekly timer cannot operate simultaneously with the ON/OFF, Program or Sleep timer. If another timer is used, the Weekly timer must be reactivated afterwards.

5. Built-in Wireless LAN control

The KMCB series has a built-in Wireless LAN adapter. The Wireless LAN indicator and control buttons are located on the indoor unit.

  • The Wireless LAN indicators can be turned off through the mobile app.
  • Wireless LAN setup and troubleshooting are covered in the separate Wireless LAN setting manual / mobile app instructions.
  • If the air conditioner operates normally from the handheld remote but not from the app, refer to the Wireless LAN setup instructions rather than treating this as an air-conditioning fault.

6. Custom code and wired controller options

Remote controller custom code

If multiple indoor units are installed in the same room, the remote controller can be changed between custom codes A, B, C and D.

  1. Stop operation so only the clock is displayed.
  2. Hold MODE for at least 5 seconds.
  3. Use the temperature buttons to select A, B, C or D.
  4. Press MODE again to save.

The indoor unit is factory-set to code A. The indoor unit and remote controller codes must match.

Optional wired remote controller

A wired remote controller can be used, but some wireless remote functions become restricted.

Wired controller typeRestricted wireless functions
Polar 3-coreOutdoor Unit Low Noise, Energy Saving, 10 °C HEAT, Powerful and timer operation.
Non-polar 2-coreOutdoor Unit Low Noise, 10 °C HEAT, Weekly timer and Powerful.

7. Cleaning and filter maintenance

Switch the unit off and isolate the power supply before cleaning. Do not touch the aluminium heat exchanger fins.
ItemRecommended interval
Main air filtersEvery 2 weeks under normal use.
Apple-catechin filter UTR-FA16Replace approximately every 3 months under normal use. Disposable; do not wash.
Ion deodorization filter UTR-FA16-2Clean approximately every 3 months and replace approximately every 3 years under normal use.

If the installer-enabled filter indicator is active, the ECONOMY indicator will blink when cleaning is due. After cleaning, press the indoor unit MANUAL AUTO button for less than 3 seconds to reset the filter indication.

8. Normal operating characteristics

  • 3-minute restart delay: the compressor may remain off for about 3 minutes after power is restored or operation is restarted.
  • Defrost: heating may stop for up to approximately 15 minutes while the outdoor unit defrosts. The OPERATION indicator blinks.
  • Low fan speed in HEAT: normal during warm-up or when the room is above set temperature.
  • Mist in COOL / DRY: can occur due to rapid cooling and condensation.
  • Steam or water outdoors in HEAT: can occur during automatic defrost.
  • Refrigerant flow or slight squeaking noises: can be normal during operation or temperature changes.

9. Troubleshooting

SymptomCheck
Does not operateCheck the circuit breaker, power supply, fuse and timer settings.
Poor cooling or heatingCheck filters, blocked inlet/outlet, set temperature, open doors/windows, strong sunlight, QUIET fan speed, Outdoor Unit Low Noise and Demand Response.
Airflow weak or stopsCan be normal in HEAT warm-up, defrost, DRY mode, AUTO monitoring or when QUIET is selected.
Remote control response is incorrectCheck battery condition, battery installation and the A/B/C/D custom code setting.
App / Wireless LAN issueRefer to the separate Wireless LAN setting manual or mobile app instructions.
Arrange service immediately if the unit smells of burning, emits smoke, leaks water, continues to fault after basic checks, or the OPERATION and TIMER indicators blink while the ECONOMY indicator flashes rapidly.
Reference: Operating Manual Part No. 9320455040 — ASTG18KMCB / ASTG22KMCB / ASTG24KMCB.