General Assist Technical Reference
Wall-Mounted Split Installation Guide
ASTG09KMCA / ASTG12KMCA indoor units
For use with the approved AOTG KMCA R32 outdoor-unit family
R32 flammable refrigerant: Installation, evacuation, charging and service work must be completed by qualified personnel using R32/R410A-rated tools and materials. Eliminate ignition sources, ventilate the work area and use an R32-compatible leak detector.
Important matched-system requirement: Confirm the exact indoor and outdoor model numbers before installation. Do not connect the indoor unit to an unapproved or non-R32 outdoor unit.
Quick specifications | Indoor installation | Outdoor installation | Piping and vacuum | Wiring | Test run | Function settings | Error codes
1. Quick specifications
| Item | Requirement |
|---|---|
| Refrigerant | R32 |
| Liquid pipe | 6.35 mm (1/4 in), minimum wall thickness 0.8 mm |
| Gas pipe | 9.52 mm (3/8 in), minimum wall thickness 0.8 mm |
| Maximum pipe length | 20 m |
| Maximum height difference | 15 m |
| Additional charge | None up to the maximum 20 m pipe length for model 09/12 |
| Maximum refrigerant charge | 850 g for model 09/12 family |
| Cooling outdoor range | 10°C to 46°C |
| Heating outdoor range | -15°C to 24°C |
| Connection cable | 1.5 mm², 3 conductors plus earth, Type 60245 IEC57 |
| Power supply | 1 phase, 240 V, 50 Hz |
| Model 09 breaker | 10 A overcurrent protection; 30 mA / 0.1 s earth-leakage protection |
| Model 12 breaker | 16 A overcurrent protection; 30 mA / 0.1 s earth-leakage protection |
Short pipework: Pipe runs shorter than 3 m may transfer outdoor-unit sound to the indoor unit and can create higher perceived operating noise.
2. Indoor-unit installation
| Clearance | Minimum |
|---|---|
| Above unit | 63 mm |
| Left side | 70 mm |
| Right side | 130 mm |
| Floor to indoor unit | 1.8 m |
| Remote controller operating distance | Maximum 7 m |
Installation sequence
| 1 | Select a strong, level wall with unrestricted inlet and outlet airflow and suitable drainage access. |
| 2 | Install the wall-hook bracket horizontally and vertically level using at least five suitable fixing screws. |
| 3 | Cut a 65 mm wall hole with the outside edge 5–10 mm lower than the inside edge. |
| 4 | Fit a wall pipe and wall cap. Never allow the interconnection cable to contact the raw metal edge of the wall opening. |
| 5 | Route rear, right or bottom piping. Keep the drain hose below the refrigerant pipes. |
| 6 | Hook the indoor unit onto the upper bracket hooks, then press the lower section firmly onto both lower hooks. |
Drainage: The drain hose must continuously fall to the outside. Do not lift the hose, create waves or leave its end submerged in water. Confirm drainage during commissioning.
3. Outdoor-unit installation
| Side | Minimum clearance |
|---|---|
| Rear | 10 cm |
| Left side | 10 cm |
| Right side | 25 cm |
| Front | 20 cm |
| Above | 60 cm |
| Below | 5 cm |
- Mount on a strong, level stand and secure against vibration and strong wind.
- Do not install directly on the ground.
- Leave at least three of the four horizontal directions open where possible.
- Keep away from flammable gas, heat sources, heavy dust, corrosive atmospheres and locations where discharge air or noise will disturb neighbours.
- In freezing conditions, do not use the outdoor drain pipe and drain caps where ice blockage may occur.
4. Refrigerant piping and evacuation
Flare-nut tightening torque
| Pipe size | Torque |
|---|---|
| 6.35 mm (1/4 in) | 16–18 N·m |
| 9.52 mm (3/8 in) | 32–42 N·m |
Flare connection: Centre the flare correctly, initially tighten by hand and finish with two spanners and a calibrated torque wrench. Do not perform the indoor flare connection inside the occupied room.
Vacuum procedure
| 1 | Confirm both service valves are fully closed and connect the gauge manifold to the 3-way valve charging port. |
| 2 | Open the low-pressure manifold valve and operate an R32/R410A-compatible vacuum pump. |
| 3 | Evacuate for at least 15 minutes and confirm -0.1 MPa (-1 bar / -76 cmHg). |
| 4 | Close the low-pressure manifold valve and stop the vacuum pump. |
| 5 | Briefly crack the 3-way valve until pressure rises to approximately 0.1–0.2 MPa, then disconnect the charging hose. |
| 6 | Fully open the 2-way and 3-way valve stems and tighten all caps. |
| 7 | Leak-test every flare and service-valve connection with an R32-compatible detector. |
| Cap | Torque |
|---|---|
| 1/4 in valve blank cap | 20–25 N·m |
| 3/8 in valve blank cap | 20–25 N·m |
| Charging-port cap | 12.5–16 N·m |
5. Electrical wiring
Indoor-to-outdoor connection: Match terminal numbers 1, 2 and 3 at both units and connect protective earth. Incorrect terminal matching may damage the equipment or create a fire risk.
| Terminal screw | Torque |
|---|---|
| M3.5 | 0.8–1.0 N·m |
| M4 | 1.2–1.8 N·m |
| M5 | 2.0–3.0 N·m |
- Use insulated ring or crimp terminals and tighten to the specified torque.
- Clamp the cable by its outer sheath, not the individual conductor insulation.
- Keep the demand-control signal cable separated from mains wiring.
- Confirm continuity of protective earth.
- Isolate power before removing covers or disconnecting any wiring.
6. Test run and commissioning
Forced cooling test: Press and hold the indoor-unit MANUAL AUTO button for more than 10 seconds. The OPERATION and TIMER indicators flash together. End the test using START/STOP on the remote controller.
| Check | Done |
|---|---|
| Remote-control buttons operate correctly | ☐ |
| Indicator lamps operate correctly | ☐ |
| Airflow-direction louvres operate correctly | ☐ |
| Drain test completed with no leaks | ☐ |
| No abnormal noise or vibration | ☐ |
| No refrigerant leakage detected | ☐ |
| Outdoor discharge air and drainage will not disturb neighbours | ☐ |
7. Function settings
Enter function-setting mode: While holding POWERFUL and TEMP ▲, press the recessed RESET button. Select the function number and setting value, press MODE to transmit, then START/STOP to save.
After completing function settings, turn power off, wait at least 30 seconds, then restore power. The setting does not become active until the unit is power-cycled.
| Function | No. | Value | Setting |
|---|---|---|---|
| Filter sign | 11 | 00 | 400 hours |
| 01 | 1,000 hours | ||
| 02 | 200 hours | ||
| 03 | No indication — factory setting | ||
| Cooling room-temperature correction | 30 | 00 | Standard — factory setting |
| 01 | Slightly lower control | ||
| 02 | Lower control | ||
| 03 | Higher control |
8. Common error-code reference
| Code | Description |
|---|---|
| 11 | Serial communication error |
| 12 | Wired remote-controller communication error |
| 15 | Check-run unfinished |
| 21 | Unit number or refrigerant-circuit address error |
| 22 | Indoor-unit capacity error |
| 23 | Combination error |
| 35 | Manual AUTO switch error |
| 41 | Room-temperature sensor error |
| 42 | Indoor heat-exchanger temperature sensor error |
| 51 | Indoor-unit fan motor error |
| 62 | Outdoor-unit main PCB model-information or communication error |
| 63 | Inverter error |
| 64 | Active-filter / PFC circuit error |
| 65 | Trip terminal L error |
| 71 | Discharge-temperature sensor error |
| 74 | Outdoor-temperature sensor error |
| 84 | Current sensor error |
| 94 | Trip detection |
| 95 | Compressor rotor-position detection error |
| 97 | Outdoor-unit fan motor error |
| 99 | 4-way valve error |
| A1 | Discharge-temperature error |
| A4 | High-pressure error |
| A5 | Low-pressure error |
Final handover: Explain operation, filter maintenance and remote-controller use to the customer. Leave the operating and installation manuals on site.
Based on Fujitsu General indoor installation manual Part No. 9333005126 and outdoor installation manual Part No. 9320394004-02. This guide is a simplified field reference and does not replace the complete manuals, current Australian/New Zealand regulations or the equipment rating labels.