General Assist Technical Reference
Wall-Mounted Split Installation Guide
ASTG09KMTC / ASTG12KMTC
For approved AOTG09KMTC / AOTG12KMTC R32 outdoor units
R32 flammable refrigerant: Installation, pressure testing, evacuation, charging and service work must be completed by qualified personnel using R32/R410A-rated tools and materials. Remove ignition sources, ventilate the area and use an R32-compatible leak detector.
Room-size requirement: Where total refrigerant charge exceeds 1.22 kg, verify that the installation room meets the minimum floor-area requirements stated in the indoor installation manual.
KMTC highlights | Specifications | Indoor installation | Outdoor installation | Sealing test | Vacuum and charge | Wiring | Settings | Error codes
1. KMTC model highlights
| Feature | KMTC requirement |
|---|---|
| Factory refrigerant charge | Suitable for up to 15 m of pipework. |
| Additional refrigerant | Add 20 g/m above 15 m, up to 100 g at the 20 m maximum. |
| Sealing test | Dry nitrogen at 4.15 MPa with a 24-hour standing test. |
| Outdoor clearance format | Clearances vary according to rear, side, front and overhead obstacles. |
| Human sensor | Approximately 6 m range, 90° vertical and 100° horizontal coverage. |
| Optional controls | Supports optional two-wire wired controls, external input/output and group control through the specified communication kit. |
2. Quick specifications
| Item | Requirement |
|---|---|
| Refrigerant | R32 |
| Liquid pipe | 6.35 mm (1/4 in), minimum thickness 0.8 mm |
| Gas pipe | 9.52 mm (3/8 in), minimum thickness 0.8 mm |
| Maximum pipe length | 20 m |
| Maximum height difference | 15 m |
| Factory charge allowance | 15 m |
| Additional charge | 20 g/m above 15 m; 100 g at 20 m |
| 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 |
| Breaker | 10 A for both model 09 and model 12 |
| Earth leakage protection | 30 mA |
3. Indoor-unit installation
| Clearance | Minimum |
|---|---|
| Above wall-hook bracket | 67 mm |
| Left side | 107 mm |
| Right side | 183 mm |
| Front clearance | 1,500 mm |
| Floor to indoor unit | 1,800 mm |
Human sensor: Keep furniture, heating appliances and other large objects outside the sensor detection area. The approximate detection range is 6 m, 90° vertically and 100° horizontally.
Six piping directions
Right rear Right Right bottom Left bottom Left Left rear
| 1 | Select a level, vibration-free wall with unrestricted airflow and easy drain access. |
| 2 | Secure the wall-hook bracket level using at least five 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 so wiring cannot contact raw metal. |
| 5 | For left-side piping, interchange the drain hose and drain cap and refit the retaining screw. |
| 6 | Keep the drain hose below the refrigerant pipes and maintain continuous fall. |
| 7 | Engage the upper bracket rail first, then push the lower fittings onto the bottom hooks. |
Drainage: The drain hose must slope continuously downward. Do not create lifts, waves or submerged ends. Apply freeze protection where the drain may be exposed below 0°C.
4. Outdoor-unit installation
| Obstacle arrangement | Minimum clearance |
|---|---|
| Rear only | 100 mm |
| Rear and both sides | Rear 100 mm; sides 100 mm and 250 mm |
| Front only | 600 mm |
| Front and rear | Front 600 mm; rear 100 mm |
| Rear and overhead obstruction | Rear 100 mm; overhead 600 mm; overhead depth maximum 200 mm |
| Multiple units side-by-side | Minimum 250 mm between units |
- Mount on a base at least 50 mm wide using four M10 anchor bolts.
- Anchor-bolt projection should be approximately 20 mm.
- Do not tilt the outdoor unit more than 3° and never tilt toward the compressor side.
- Do not install directly on the ground.
- Provide drainage and allow room for ice build-up in cold climates.
- Do not stack units where drainage from the upper unit can freeze onto the lower unit.
5. Flare connections
| Pipe size | Torque |
|---|---|
| 6.35 mm (1/4 in) | 16–18 N·m |
| 9.52 mm (3/8 in) | 32–42 N·m |
Use R32/R410A flare tools. Keep bend radius at 70 mm or greater and do not repeatedly bend the same pipe section more than three times. Use alkylbenzene oil on the outdoor flare surface; do not use mineral oil.
6. Nitrogen sealing test
Dry nitrogen only: Never use oxygen, compressed air, refrigerant or flammable gas for the sealing test.
| 1 | Confirm both service valves are closed and power is isolated. |
| 2 | Add nitrogen to both liquid and gas pipes. |
| 3 | Pressurise to 4.15 MPa. |
| 4 | Check all flare connections and any brazed joints. |
| 5 | Allow the system to stand for 24 hours and confirm pressure has not fallen. |
| 6 | Allow for ambient-temperature change: a 5°C change alters test pressure by approximately 0.05 MPa. |
| 7 | Release nitrogen slowly after the test is complete. |
7. Vacuum and additional charging
| 1 | Connect a clean R32/R410A manifold and vacuum pump to the charging port. |
| 2 | Evacuate to -0.1 MPa or -76 cmHg. |
| 3 | Continue evacuation for at least 15 minutes after reaching target vacuum. |
| 4 | Disconnect hoses and tighten the charging-port cap. |
| 5 | Fully open both service-valve spindles using a 4 mm hex key at 6–7 N·m. |
| 6 | For pipework above 15 m, charge liquid R32 by electronic scale at 20 g/m. |
| 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 indoor and outdoor units. Connect protective earth and clamp all cables by the outer sheath.
| Terminal screw | Torque |
|---|---|
| M4 indoor terminal | 1.2–1.8 N·m |
- Use a dedicated power circuit and harmonic-compatible earth-leakage breaker.
- Do not install a power-factor correction capacitor.
- Do not use crossover power wiring.
- Keep the demand-control cable away from mains and interconnection wiring.
- Wait at least 10 minutes after isolating the outdoor unit before touching electrical components.
9. Optional controls and function settings
| Option | Reference |
|---|---|
| Two-wire wired remote controller | UTY-RNR series; communication kit UTY-TWRXZ2 required |
| Simple remote controller | UTY-RSR / UTY-RHR series; communication kit required |
| External input/output PCB | UTY-XCSXZ2 |
| External connect kit | UTY-XWZXZ5 |
| Communication kit | UTY-TWRXZ2 |
Complete all required function settings before final commissioning. After changing function settings, isolate power, wait at least 30 seconds and restore power before testing.
10. Test run and handover
Hold the indoor-unit MANUAL AUTO button for more than 10 seconds to start forced cooling. The OPERATION and TIMER lamps flash together. Use START/STOP on the remote controller to stop the test.
| Commissioning check | Done |
|---|---|
| Remote-controller operation confirmed | ☐ |
| Indicator lamps operate correctly | ☐ |
| Airflow louvres operate correctly | ☐ |
| Human sensor unobstructed and operating correctly | ☐ |
| Drainage test completed with no leaks | ☐ |
| No abnormal noise or vibration | ☐ |
| No refrigerant leakage detected | ☐ |
| Customer shown correct operation and filter maintenance | ☐ |
11. Common error-code reference
| Code | Description |
|---|---|
| 11 | Serial communication error |
| 12 | Wired remote-controller communication error |
| 41 | Room-temperature sensor error |
| 42 | Indoor heat-exchanger middle-temperature sensor error |
| 44 | Human sensor error |
| 51 | Indoor fan motor error |
| 61 | Outdoor reverse/missing phase or wiring error |
| 62 | Outdoor 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 fan motor error |
| 99 | 4-way valve error |
| A1 | Discharge-temperature error |
| A4 | High-pressure error |
| A5 | Low-pressure error |
Final handover: Leave the installation and operating manuals with the customer and record any changed function settings, optional controls and additional refrigerant charge.
Based on Fujitsu General indoor installation manual Part No. 9387603040-03 and outdoor installation manual Part No. 9319205298. This simplified field reference does not replace the complete manuals, equipment rating labels or current Australian and New Zealand electrical and refrigerant regulations.