General Assist Technical Reference
ASTG30/34KMTC Technical Manual
Indoor: ASTG30KMTC / ASTG34KMTC
Outdoor: AOTG30KMTC / AOTG34KMTC — R32 inverter heat-pump systems
Qualified personnel only: Installation, refrigerant work, electrical testing, commissioning and servicing must be completed by appropriately licensed and trained personnel using R32-compatible tools and safe work procedures.
This solution summarises the principal technical information from Design & Technical Manual DR_AS107EF_01. It is intended as a rapid field reference and does not replace the full installation, design, service or operating manuals.
1. System specifications
| Item | ASTG30 / AOTG30KMTC | ASTG34 / AOTG34KMTC |
|---|---|---|
| Power supply | 240 V, 1 phase, 50 Hz — operating range 198–264 V | |
| Rated cooling capacity | 8.50 kW | 9.40 kW |
| Cooling capacity range | 2.9–10.5 kW | 2.9–11.2 kW |
| Rated heating capacity | 9.00 kW | 10.30 kW |
| Heating capacity range | 2.2–11.2 kW | 2.7–11.7 kW |
| Rated cooling input | 2.46 kW | 2.78 kW |
| Rated heating input | 2.34 kW | 2.84 kW |
| Maximum operating current | 17.0 A | 19.5 A |
| Circuit breaker | 20 A; 30 mA earth-leakage breaker, 0.1 second or less | |
| Refrigerant | R32 | |
| Liquid pipe | 9.52 mm (3/8 in) | |
| Gas pipe | 15.88 mm (5/8 in) | |
| Maximum pipe length | 75 m | |
| Maximum height difference | 30 m | |
| Factory refrigerant charge | 1,650 g | 2,000 g |
| Factory pre-charge pipe length | 20 m | 30 m |
| Outdoor operating range | Cooling -10°C to 46°C; heating -15°C to 24°C | |
R32 room-area check: Confirm the total refrigerant charge against the minimum-room-area requirements before installation, particularly where additional charge is required.
2. Indoor-unit technical reference
Dimensions and installation clearances
| Item | Requirement |
|---|---|
| Indoor dimensions | 340 × 1,150 × 280 mm |
| Net weight | 18.5 kg |
| Above unit / wall bracket | 88 mm or more above unit; 63 mm or more above bracket reference |
| Left side | 50 mm minimum; 70 mm recommended clearance reference |
| Right side | 50 mm minimum; 140 mm recommended clearance reference |
| Front clearance | 1,500 mm or more |
| Installation height | 1,800 mm or more above floor |
Airflow and sound pressure
| Fan speed | Airflow | Cooling sound pressure |
|---|---|---|
| High | 1,400 m³/h — 389 L/s — 824 CFM | 51 dB(A) ASTG30; 52 dB(A) ASTG34 |
| Medium | 1,150 m³/h — 319 L/s — 677 CFM | 46 dB(A) ASTG30; 47 dB(A) ASTG34 |
| Low | 920 m³/h — 256 L/s — 542 CFM | 40 dB(A) ASTG30; 41 dB(A) ASTG34 |
| Quiet | 720 m³/h — 200 L/s — 424 CFM | 33 dB(A) ASTG30; 34 dB(A) ASTG34 |
The air-velocity charts in the full manual show throw approaching 15 m under high-fan laboratory conditions. Actual throw is affected by room geometry, louvre position, installation height and obstructions.
Indoor wiring and sensors
| Connection | Function |
|---|---|
| Terminals 1 / 2 / 3 + earth | Indoor-outdoor power and control interconnection |
| CN1 | Pipe and room thermistors |
| CN5 | Indoor fan motor |
| CN7 / CN8 | Vertical and horizontal louvre motors |
| CN10 | Pyroelectric human-sensor PCB |
| CN13 | Optional 2-wire remote-controller interface |
Indoor protection devices
| Protection | Action |
|---|---|
| Indoor PCB fuse | 250 V, 3.15 A |
| Fan thermistor protection | Above 85°C: fan slows; 85°C or less: speed recovers |
| Fan power-IC thermal shutdown | 150 ±15°C: fan stops; below 135°C: fan restarts |
3. Controls, optional interfaces and group control
Compatible control options
| Option | Reference |
|---|---|
| 2-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 |
The indoor external input/output PCB and Wireless LAN adaptor cannot be used simultaneously. Group control also cannot be used together with the Wireless LAN adaptor.
Indoor external input/output PCB
| Connector | Function |
|---|---|
| CN313 / CN314 | Operation/Stop, forced stop or forced thermostat-off input, depending on function and rotary-switch settings |
| CN310 | Operation status output |
| CN311 | Error status output |
| CN312 | Indoor-fan status or external-heater output, depending on rotary-switch setting |
- External input cable: twisted pair, maximum 150 m.
- Dry-contact or applied-voltage input may be selected; do not use both simultaneously.
- Applied-voltage input: DC 12–24 V.
- External output cable: 22 AWG twisted pair, maximum 25 m.
- Output: high DC 12 V ±2 V, low 0 V; maximum permissible current 50 mA.
- Pulse input must be longer than 200 ms.
Group control
A single 2-wire controller can operate up to 16 indoor units. Total remote-controller wiring must not exceed 500 m. Automatic addressing uses address 00. Manual addressing supports up to 15 indoor units using unique addresses 01–15.
Common indoor function settings
| Function | Number | Purpose |
|---|---|---|
| Remote-controller address | 00 | Automatic address 00 or manual addresses 01–15 |
| Filter indication | 11 | 400, 1,000 or 200 hours, or no indication |
| Indoor sensor cooling correction | 30 | Room-temperature correction from -4°C to +4°C |
| Indoor sensor heating correction | 31 | Room-temperature correction from -4°C to +4°C |
| Wired-controller cooling correction | 35 | Used when wired-controller sensor is enabled |
| Wired-controller heating correction | 36 | Used when wired-controller sensor is enabled |
| Auto restart | 40 | Enable or disable automatic restart after power interruption |
| Room sensor selection | 42 | Indoor sensor only or indoor plus wired-controller sensor |
| External input mode | 46 | Operation/Stop mode 1, forced stop or Operation/Stop mode 2 |
| External heater control | 61 | Auxiliary heater, heat-pump prohibition or outdoor-temperature-based control |
| Heater-on temperature | 62 | Adjusts heater-enable temperature differential |
| Outdoor-temperature boundaries | 66 / 67 | Sets external-heater operating zones |
After changing an indoor function setting, isolate power for at least 30 seconds and then restore power. The setting will not take effect until the power cycle is completed.
4. Outdoor-unit technical reference
| Item | AOTG30KMTC | AOTG34KMTC |
|---|---|---|
| Dimensions | 830 × 900 × 330 mm | 914 × 970 × 370 mm |
| Net weight | 60 kg | 74 kg |
| Compressor | DC twin rotary, one compressor, 2,200 W motor output | |
| Cooling airflow | 3,100 m³/h | 4,100 m³/h |
| Heating airflow | 3,400 m³/h | 4,100 m³/h |
| Sound pressure | 50 dB(A) cooling; 54 dB(A) heating | |
| Power cable reference | 3.5–4.0 mm², subject to local electrical rules and voltage-drop calculation | |
| Interconnection cable | 1.5–2.5 mm²; maximum reference length 76 m where voltage drop remains below 2% | |
Outdoor protection values
| Protection | Stop / activation | Reset |
|---|---|---|
| Compressor temperature | 120°C | 80°C |
| Discharge temperature | 110°C | Restart after 7 minutes |
| High pressure | 4.2 ±0.1 MPa | 3.2 ±0.15 MPa |
| Low pressure | 0.12 MPa | 0.15 MPa |
AOTG34KMTC external control and board functions
| Connector / control | Function |
|---|---|
| CN10 | Low-noise mode external input |
| CN11 | Peak-cut mode external input |
| CN12 | Error status output |
| CN13 | Compressor status output |
| SW1 MODE | Switch between local setting and error-code display |
| SW2 SELECT | Select local setting or error code |
| SW3 ENTER | Confirm selection |
| SW4 EXIT | Return to operating-status display |
| SW5 PUMP DOWN | Start pump-down operation |
Low-noise mode can reduce available capacity. Peak-cut settings limit power demand and may reduce performance. Confirm the correct project requirement before enabling either function.
5. Service and commissioning workflow
| 1 | Confirm model pairing. Record the complete indoor and outdoor model and serial numbers before selecting documentation or parts. |
| 2 | Complete electrical checks. Confirm supply voltage, terminal sequence 1-2-3, earth continuity, cable size and voltage drop. |
| 3 | Confirm refrigerant installation. Verify pipe sizes, total length, height difference, additional refrigerant and fully open service valves. |
| 4 | Check airflow and drainage. Confirm filters and coil are clean, louvres operate, return air is unrestricted and condensate drains correctly. |
| 5 | Confirm sensor readings. Compare room, pipe, outdoor, compressor and pressure-sensor values against actual operating conditions. |
| 6 | Run the system under load. Record supply voltage, compressor current, pressures, temperatures, fan operation and fault history. |
Pre-test-run checklist
| Check | Done |
|---|---|
| Indoor and outdoor units securely installed | ☐ |
| Pressure test and leak inspection completed | ☐ |
| Pipe insulation complete | ☐ |
| Drainage confirmed | ☐ |
| Electrical connections and earth verified | ☐ |
| Air inlets and outlets unobstructed | ☐ |
| Correct refrigerant charge recorded | ☐ |
| Liquid and gas service valves fully open | ☐ |
| AOTG34 crankcase heater energised for at least 6 hours before initial test | ☐ |
Technical escalation information
Provide:
- Indoor and outdoor model and serial numbers
- Fault code and lamp or outdoor LED pattern
- Operating mode, setpoint and measured room temperature
- Supply voltage and compressor running current
- Suction and discharge pressures
- Indoor and outdoor thermistor readings
- Pipe length, height difference and refrigerant charge added
- Any PCB, motor, sensor or compressor previously replaced
- Photos of PCB switch settings, wiring and installation conditions
PCB replacement: Confirm the replacement board part number, transfer all applicable switch and jumper settings, reconnect every sensor and output to the correct terminal, and complete any required function-setting or commissioning process before returning the unit to service.
Based on Fujitsu General Design & Technical Manual DR_AS107EF_01 dated 10 June 2019 for ASTG30KMTC, ASTG34KMTC, AOTG30KMTC and AOTG34KMTC. Product specifications and technical requirements may be revised. Always confirm the latest model-specific installation, service and parts documentation before completing work.