GENERAL AIRSTAGE Technical Reference
ASTG18KMCA / ASTG22KMCA / ASTG24KMCA
Design, specifications, airflow, controls, pipework and function settings
Indoor: ASTG18KMCA / ASTG22KMCA / ASTG24KMCA
Outdoor: AOTG18KMCA / AOTG22KMCA / AOTG24KMCA
Refrigerant: R32
Outdoor: AOTG18KMCA / AOTG22KMCA / AOTG24KMCA
Refrigerant: R32
This article provides a consolidated technical reference for the ASTG18KMCA, ASTG22KMCA and ASTG24KMCA wall-mounted systems, including capacities, airflow, refrigerant requirements, electrical data, controls, external input/output and function settings.
Important: Installation, electrical and refrigerant work must be completed by appropriately qualified personnel. Always refer to the relevant installation and service documentation before carrying out work.
Models Specifications Airflow Pipework Electrical Controls Function Settings External I/O Optional Parts
1. Applicable Models
| Indoor Unit | Outdoor Unit | Rated Cooling | Rated Heating |
|---|---|---|---|
| ASTG18KMCA | AOTG18KMCA | 5.00 kW | 6.00 kW |
| ASTG22KMCA | AOTG22KMCA | 6.00 kW | 7.20 kW |
| ASTG24KMCA | AOTG24KMCA | 7.10 kW | 8.00 kW |
2. Key Specifications
| Specification | 18 | 22 | 24 |
|---|---|---|---|
| Power supply | 240 V ~ 50 Hz | ||
| Available voltage range | 198 - 264 V | ||
| Cooling range | 1.00 - 6.50 kW | 1.10 - 7.50 kW | 1.10 - 8.30 kW |
| Heating range | 1.05 - 8.30 kW | 1.10 - 9.70 kW | 1.10 - 10.60 kW |
| Indoor dimensions | 295 x 940 x 270 mm | ||
| Indoor net weight | 14 kg | ||
| Outdoor dimensions | 620 x 790 x 290 mm | ||
| Outdoor net weight | 40 kg | ||
Outdoor operating range:
Cooling: -10°C to 46°C
Heating: -15°C to 24°C
Cooling: -10°C to 46°C
Heating: -15°C to 24°C
3. Indoor Airflow
| Model | High | Medium | Low | Quiet |
|---|---|---|---|---|
| ASTG18KMCA | 930 m³/h 258 L/s | 780 m³/h 217 L/s | 630 m³/h 175 L/s | 500 m³/h 139 L/s |
| ASTG22KMCA | 1000 m³/h 278 L/s | 830 m³/h 231 L/s | 680 m³/h 189 L/s | 580 m³/h 161 L/s |
| ASTG24KMCA | 1120 m³/h 311 L/s | 830 m³/h 231 L/s | 680 m³/h 189 L/s | 580 m³/h 161 L/s |
Indoor Sound Pressure
| Model | High | Medium | Low | Quiet |
|---|---|---|---|---|
| ASTG18KMCA | 46 dB(A) | 40 dB(A) | 35 dB(A) | 29 dB(A) |
| ASTG22KMCA | 48 dB(A) | 42 dB(A) | 37 dB(A) | 32 dB(A) |
| ASTG24KMCA | 49 dB(A) | 42 dB(A) | 37 dB(A) | 32 dB(A) |
4. Refrigerant and Pipework
| Refrigerant | R32 |
| Factory charge | 1270 g |
| Liquid pipe | 6.35 mm (1/4") |
| Gas pipe | 12.70 mm (1/2") |
| Factory pre-charge pipe length | 20 m |
| Maximum pipe length | 30 m |
| Maximum height difference | 20 m |
| Additional refrigerant above 20 m | 20 g/m |
Additional Refrigerant Charge
| Total Pipe Length | Additional Charge |
|---|---|
| 20 m or less | 0 g |
| 25 m | 100 g |
| 30 m | 200 g |
Refrigerant charging: The outdoor unit contains 1270 g of R32 and is pre-charged for up to 20 m of total pipe length. For pipe lengths greater than 20 m, add R32 at 20 g per metre.
5. Electrical Characteristics
| Specification | AOTG18KMCA | AOTG22KMCA | AOTG24KMCA |
|---|---|---|---|
| Maximum operating current | 13.5 A | 16.0 A | 16.0 A |
| Starting current | 6.0 A | 7.5 A | 9.0 A |
| Circuit breaker | 16 A | 20 A | 20 A |
| Power cable | 2.5 mm² | 4.0 mm² | 4.0 mm² |
Indoor interconnection: The indoor unit technical data specifies a connection cable of 1.5 - 2.5 mm² with a limited wiring length of 31 m. Voltage drop should be kept below 2%.
6. Wireless Remote Controller Features
- Auto, Cool, Dry, Fan and Heat operating modes.
- ON timer.
- OFF timer.
- Weekly timer.
- Program timer.
- Sleep timer.
- Powerful operation.
- Economy operation.
- Human Sensor energy-saving operation.
- 10°C HEAT operation.
- Outdoor Unit Low Noise operation.
- Remote controller custom codes A, B, C and D.
Powerful Operation: The system can operate for approximately 20 minutes using maximum airflow and maximum compressor speed to provide rapid cooling or heating.
10°C HEAT: When selected, the system can maintain the room at approximately 10°C when the room temperature drops below 10°C.
Human Sensor: The indoor unit detects movement within the room and can reduce operating capacity when the room is unoccupied. When occupancy is detected again, the unit returns to its previous operating mode.
7. Function Settings
| Function | Function No. | Settings |
|---|---|---|
| Filter sign | 11 | 00 Standard 400 h / 01 Long 1000 h / 02 Short 200 h / 03 No indication (factory) |
| Room temperature correction - cooling | 30 | 00 Standard (factory) / 01 Slightly lower / 02 Lower / 03 Higher |
| Room temperature correction - heating | 31 | 00 Standard (factory) / 01 Lower / 02 Slightly higher / 03 Higher |
| Auto restart | 40 | 00 Enable (factory) / 01 Disable |
| Room temperature sensor switching | 42 | 00 Indoor unit sensor (factory) / 01 Indoor unit + wired controller sensor |
| Remote controller custom code | 44 | 00 A (factory) / 01 B / 02 C / 03 D |
| External input control | 46 | 00 Operation/Stop (factory) / 01 Setting prohibited / 02 Forced Stop |
| Indoor fan energy saving - cooling | 49 | 00 Disable (factory) / 01 Enable |
Entering Function Setting Mode
- Turn the system power on.
- While pressing POWERFUL and SET TEMP simultaneously, press RESET.
- Use the SET TEMP buttons to select the required function number.
- Use the 10°C HEAT button to move between the left and right digits.
- Press POWERFUL to move to the setting value.
- Select the required setting value using SET TEMP.
- Press MODE to confirm the setting.
- Confirm the indoor unit produces a beep.
- Press START/STOP and confirm another beep.
- Press RESET to exit Function Setting mode.
- Turn the system power off.
- Wait at least 30 seconds before restoring power.
Important: Function setting changes will not become active until the system power has been switched off and then back on. Wait at least 30 seconds before restoring power.
8. External Input and Output
| Connector | Function | Description |
|---|---|---|
| CNA01 | Control input | Operation/Stop or Forced Stop input depending on Function 46. |
| CNB01 | Operation status output | Provides an operating status signal from the indoor unit. |
| CNB02 | Error status output | Provides an error status signal from the indoor unit. |
Required components:
Communication Kit: UTY-TWBXF1
External Connect Kit: UTY-XWZXZ5
The communication kit is required when connecting external devices to these indoor units.
Communication Kit: UTY-TWBXF1
External Connect Kit: UTY-XWZXZ5
The communication kit is required when connecting external devices to these indoor units.
External connection limits: The maximum distance between the indoor unit PC board and the connected external device is 10 m.
9. Optional Controllers and Accessories
| Type | Model | Notes |
|---|---|---|
| Wired Remote Controller | UTY-RVNYN | Requires UTY-TWBXF1 Communication Kit. |
| Wired Remote Controller | UTY-RNNYN | Includes built-in room temperature sensor. Requires UTY-TWBXF1. |
| Simple Remote Controller | UTY-RSNYN | Provides basic Start/Stop, fan speed, temperature and mode control. Requires UTY-TWBXF1. |
| Communication Kit | UTY-TWBXF1 | Provides the interface between compatible optional devices and the indoor unit PC board. |
| External Connect Kit | UTY-XWZXZ5 | Used for external input/output connections. UTY-TWBXF1 is also required. |
10. Service and Protection Information
| Indoor PCB fuse | 250 V / 3.15 A |
| Outdoor main PCB fuses | 250 V / 25 A and 250 V / 5 A |
| Outdoor fan motor protection OFF | 100 ± 15°C |
| Outdoor fan motor protection ON | 95 ± 10°C |
| Compressor discharge temperature protection | OFF at 110°C |
| Compressor restart after thermal protection | After 7 minutes |
11. Quick Reference
Refrigerant: R32
Factory charge: 1270 g
Pre-charge: 20 m
Maximum pipe length: 30 m
Maximum height difference: 20 m
Additional charge: 20 g/m above 20 m
Liquid pipe: 6.35 mm
Gas pipe: 12.70 mm
Cooling outdoor range: -10°C to 46°C
Heating outdoor range: -15°C to 24°C
Communication kit: UTY-TWBXF1
Technical reference: Design & Technical Manual DTR_AS082E_04 / DTR_AO144E_03 for ASTG18KMCA, ASTG22KMCA, ASTG24KMCA and AOTG18KMCA, AOTG22KMCA, AOTG24KMCA. Refer to the complete technical documentation for wiring diagrams, dimensional drawings, capacity correction tables, refrigerant circuit diagrams and sound curves.