General Assist Technical Reference
Wall-Mounted Split Installation Guide
ASTG09KMCB / ASTG12KMCB
For approved AOTG09KMCB / AOTG12KMCB R32 outdoor units
R32 flammable refrigerant: Installation, pressure testing, evacuation 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.
KMCB highlights | Specifications | Indoor installation | Outdoor installation | Pressure test | Vacuum | Wiring | Commissioning
1. KMCB model highlights
| Feature | KMCB requirement |
|---|---|
| Built-in WLAN | Record the WLAN label inside the front panel and retain it with the WLAN setting manual. |
| Piping directions | Rear, right, bottom, left-bottom, left and left-rear. |
| Pressure test | Dry nitrogen only, pressurised to 4.15 MPa before evacuation. |
| Vacuum target | -0.1 MPa or 65 Pa / 500 microns, followed by a 1–2 minute standing test. |
| Wireless test run | Wait one minute after energising, then use the remote-controller TEST RUN button. |
2. Quick specifications
| Item | Requirement |
|---|---|
| Refrigerant | R32 |
| Liquid pipe | 6.35 mm (1/4 in), 0.8 mm minimum wall thickness |
| Gas pipe | 9.52 mm (3/8 in), 0.8 mm minimum wall thickness |
| Maximum pipe length | 20 m |
| Maximum height difference | 15 m |
| Additional refrigerant | None required up to 20 m |
| Maximum total charge | 850 g |
| Cooling range | 10°C to 46°C |
| Heating range | -15°C to 24°C |
| Power supply | 1 phase, 240 V, 50 Hz; operating range 198–264 V |
| Power cable | 1.5 mm², 2 conductors plus earth |
| Interconnection cable | 1.5 mm², 3 conductors plus earth |
| Model 09 breaker | 10 A overcurrent protection |
| Model 12 breaker | 16 A overcurrent protection |
| Earth leakage breaker | 30 mA, 0.1 second or less |
Short pipework: Pipe runs below 3 m may transfer outdoor-unit sound to the indoor unit and produce higher perceived operating noise.
3. Indoor-unit installation
| Clearance | Minimum |
|---|---|
| Above unit | 63 mm |
| Left side | 70 mm |
| Right side | 130 mm |
| Floor to unit | 1.8 m |
| Remote-controller range | Maximum 7 m |
Piping direction
The KMCB indoor unit supports six pipe routes: Rear Right Bottom Left-bottom Left Left-rear
| 1 | Choose a strong, level wall with unrestricted airflow, suitable drain fall and adequate WLAN reception. |
| 2 | Fit the wall-hook bracket level using at least five large fixing screws. |
| 3 | Cut a 65 mm hole with the outside edge 5–10 mm lower than the inside edge. |
| 4 | Fit a wall pipe and wall cap to prevent the interconnection cable contacting raw metal. |
| 5 | For left-side routes, transfer the drain hose and drain cap to the opposite side and refit the retaining screw. |
| 6 | Keep the drain hose below the refrigerant pipes and confirm continuous fall. |
| 7 | Hang the unit on the upper hooks, align the pipe marks and engage both lower hooks. |
Drainage: Do not lift the hose, create waves or submerge its end. In low-temperature locations, protect the drain hose from freezing.
4. Outdoor-unit installation
| Side | Minimum clearance |
|---|---|
| Rear | 10 cm |
| Left | 10 cm |
| Right | 25 cm |
| Front | 20 cm |
| Above | 60 cm |
| Below | 5 cm |
- Install on a strong, level stand and limit tilt to less than 5°.
- Do not install directly on the ground.
- Secure against strong wind and maintain unrestricted discharge airflow.
- Keep at least three of the four horizontal sides open where possible.
- Do not fit the drain pipe or caps where freezing may block drainage.
5. Flare connection
| Pipe size | Flare-nut torque |
|---|---|
| 6.35 mm | 16–18 N·m |
| 9.52 mm | 32–42 N·m |
Use R32/R410A-compatible flare tools. Maintain a bend radius of at least 70 mm and do not bend the same section more than three times.
6. Pressure test
Dry nitrogen only. Never use refrigerant, oxygen, compressed air, flammable gas or combustible gas to pressure-test the pipework.
| 1 | Confirm both service valves are fully closed and power remains isolated. |
| 2 | Introduce dry nitrogen into both the liquid and suction lines. |
| 3 | Pressurise the system to 4.15 MPa. |
| 4 | Leak-test indoor and outdoor flare connections. |
| 5 | Confirm system pressure does not fall before releasing test pressure safely. |
7. Vacuum and drying process
| 1 | Connect the manifold to the 3-way valve charging port with both service valves closed. |
| 2 | Operate an R32/R410A-compatible vacuum pump. |
| 3 | Achieve -0.1 MPa or 65 Pa / 500 microns. |
| 4 | Continue vacuum operation for at least 15 minutes. |
| 5 | Close the manifold, stop the pump and stand for 1–2 minutes. Confirm the gauge does not rise. |
| 6 | Crack the 3-way valve until pressure reaches approximately 0.1–0.2 MPa, then remove the hose. |
| 7 | Fully open both service valves and tighten all caps. |
| Cap | Torque |
|---|---|
| 1/4 in blank cap | 20–25 N·m |
| 3/8 in blank cap | 20–25 N·m |
| Charging-port cap | 12.5–16 N·m |
8. Electrical wiring
Match terminals 1, 2 and 3 between the indoor and outdoor units and connect protective earth. Clamp cables by the outer sheath.
| Terminal | Torque |
|---|---|
| M3.5 | 0.8–1.0 N·m |
| M4 | 1.2–1.8 N·m |
| M5 | 2.0–3.0 N·m |
Keep the demand-control signal cable separate from the mains and interconnection wiring to prevent electrical interference.
9. Test run and final checks
Wireless remote controller
- Connect power and wait at least one minute.
- Press START/STOP.
- Press the recessed TEST RUN button using a ballpoint pen or similar object.
- Press START/STOP to finish the test.
Indoor-unit button
Hold the MANUAL AUTO button for more than 10 seconds to begin the forced test. The OPERATION and TIMER lamps flash together. Stop using START/STOP on the remote controller.
| Commissioning check | Done |
|---|---|
| Remote-controller buttons and display operate correctly | ☐ |
| Indicator lamps operate correctly | ☐ |
| Airflow louvres operate correctly | ☐ |
| Drainage test completed with no leaks | ☐ |
| No abnormal noise or vibration | ☐ |
| No refrigerant leakage detected | ☐ |
| WLAN label recorded and setting manual retained | ☐ |
| Customer shown operation and filter maintenance | ☐ |
Do not energise the system until the pressure test, evacuation, electrical checks and cover installation are complete.
Based on Fujitsu General indoor installation manual Part No. 9333005201-02 and outdoor installation manual Part No. 9320394004-04. This simplified field reference does not replace the complete manuals, rating labels or current Australian and New Zealand electrical and refrigerant regulations.