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 work area and use an R32-compatible leak detector.
Minimum room area: Where the total refrigerant charge exceeds 1.22 kg, confirm the installation room meets the minimum floor-area requirements in the indoor installation manual.
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 |
| Factory charge allowance | Up to 15 m of pipework |
| Additional refrigerant | 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 |
| Circuit breaker | 10 A for model 09 and model 12 |
| Earth leakage breaker | 30 mA |
Short pipework: Pipe runs shorter than 3 m may transfer outdoor-unit sound to the indoor unit and increase perceived operating noise.
2. 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: Approximate detection range is 6 m, 90° vertically and 100° horizontally. Keep heaters and large objects outside the detection area.
Six piping directions
Right rear Right Right bottom Left bottom Left Left rear
| 1 | Select a strong, level wall with unrestricted airflow, suitable drainage and adequate service access. |
| 2 | Secure the wall-hook bracket level using at least five large 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 to prevent wiring contacting raw metal. |
| 5 | For left-side piping, transfer 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 hooks first, then push the lower fittings onto the bottom hooks. |
Drainage: Do not lift the drain hose, create waves or submerge its end. Apply freeze protection where the hose may be exposed below 0°C.
3. 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° or towards the compressor side.
- Do not install directly on the ground.
- Provide drainage and allow space for ice build-up in cold climates.
- Do not stack units where drainage from the upper unit can freeze onto the lower unit.
4. Flare connections
| Pipe size | 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. Apply alkylbenzene oil to the outdoor flare surface; do not use mineral oil.
5. 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 remains isolated. |
| 2 | Add dry nitrogen to both the liquid and gas lines. |
| 3 | Pressurise to 4.15 MPa. |
| 4 | Leak-test all flare connections and 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. |
6. 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 operating the vacuum pump for at least 15 minutes after reaching target vacuum. |
| 4 | Disconnect the service 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 |
7. Electrical wiring
Match terminals 1, 2 and 3 between indoor and outdoor units and connect protective earth. Clamp cables by the outer sheath.
| Terminal screw | Torque |
|---|---|
| M4 indoor terminal | 1.2–1.8 N·m |
Keep demand-control wiring separated from power and interconnection wiring. Wait at least 10 minutes after isolating the outdoor unit before touching electrical components.
8. Test run and commissioning
Hold the indoor-unit MANUAL AUTO button for more than 10 seconds to start forced cooling. The OPERATION and TIMER lamps flash together. Stop using START/STOP on the remote controller.
| 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 operation and filter maintenance | ☐ |
9. Optional controls
| 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 |
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 regulations.