GENERAL Assist Technical Reference
ASTG30CMTB / ASTG34CMTB
Wall Mounted R32 Cooling-Only Systems
Indoor: ASTG30CMTB / ASTG34CMTB | Outdoor: AOTG30CMTB / AOTG34CMTB
This article summarises the main technical specifications, piping requirements, electrical data, control options and function settings for the ASTG30CMTB and ASTG34CMTB wall mounted systems.
Important: These models are cooling only. Installation, electrical work and refrigerant handling must be completed by appropriately qualified personnel and in accordance with local regulations.
1. Quick reference
| Item | 30 Model | 34 Model |
|---|---|---|
| Indoor unit | ASTG30CMTB | ASTG34CMTB |
| Outdoor unit | AOTG30CMTB | AOTG34CMTB |
| Cooling capacity | 8.50 kW | 9.40 kW |
| Capacity range | 2.9–10.5 kW | 2.9–11.2 kW |
| Refrigerant | R32 | R32 |
| Liquid / gas pipe | 9.52 / 15.88 mm (3/8 / 5/8 in) | 9.52 / 15.88 mm (3/8 / 5/8 in) |
| Maximum pipe length | 75 m | 75 m |
| Maximum height difference | 30 m | 30 m |
| Cooling operating range | -10 to 46°C outdoor | -10 to 46°C outdoor |
2. System specifications
| Specification | ASTG30CMTB / AOTG30CMTB | ASTG34CMTB / AOTG34CMTB |
|---|---|---|
| Power supply | 240 V ~ 50 Hz, supplied to outdoor unit | |
| Available voltage range | 198–264 V | |
| Rated cooling input | 2.46 kW | 2.78 kW |
| Rated current | 10.4 A | 11.7 A |
| Maximum operating current | 17.0 A | 19.5 A |
| EER | 3.45 kW/kW | 3.38 kW/kW |
| Sensible cooling capacity | 6.00 kW | 6.95 kW |
| Indoor airflow – High | 1,400 m³/h (389 L/s) | |
| Indoor sound pressure – High / Quiet | 51 / 32 dB(A) | |
| Indoor dimensions (H × W × D) | 340 × 1,150 × 280 mm | |
| Indoor net weight | 18 kg | |
| Outdoor dimensions (H × W × D) | 830 × 900 × 330 mm | 914 × 970 × 370 mm |
| Outdoor net weight | 61 kg | 74 kg |
| Outdoor sound pressure | 51 dB(A) | 51 dB(A) |
3. Refrigerant piping and charge
| Item | AOTG30CMTB | AOTG34CMTB |
|---|---|---|
| Factory refrigerant charge | 1,650 g R32 | 2,000 g R32 |
| Pre-charge pipe length | 20 m | 30 m |
| Additional charge | 40 g/m over 20 m | 45 g/m over 30 m |
| Maximum pipe length | 75 m | |
| Maximum height difference | 30 m | |
| Liquid pipe | Ø 9.52 mm (3/8 in) | |
| Gas pipe | Ø 15.88 mm (5/8 in) | |
Charge examples:
AOTG30CMTB: 30 m = 400 g additional; 40 m = 800 g; 50 m = 1,200 g; 75 m = 2,200 g.
AOTG34CMTB: 40 m = 450 g additional; 50 m = 900 g; 75 m = 2,025 g.
AOTG30CMTB: 30 m = 400 g additional; 40 m = 800 g; 50 m = 1,200 g; 75 m = 2,200 g.
AOTG34CMTB: 40 m = 450 g additional; 50 m = 900 g; 75 m = 2,025 g.
4. Electrical characteristics
| Electrical item | 30 Model | 34 Model |
|---|---|---|
| Maximum operating current | 17.0 A | 19.5 A |
| Starting current | 10.7 A | 11.2 A |
| Technical manual sample circuit breaker | 32 A | |
| Technical manual sample power cable | 4.0 mm² | |
| Indoor / outdoor connection cable | 1.5–2.5 mm² | |
| Limited wiring length | 76 m | |
The cable and circuit breaker values above are the sample values shown in the technical manual. Final selection must comply with the applicable Australian/New Zealand electrical rules and installation conditions. Keep voltage drop below 2%; increase conductor size where required.
5. Controls, external input/output and group control
Indoor external input – CN2
The indoor PCB supports an external dry-contact input on CN2. The signal type is edge and the operating mode is selected by Function 46.
| Function 46 | Mode | Operation |
|---|---|---|
| 00 | Operation / Stop mode 1 | External input starts/stops the unit; remote controller remains enabled. |
| 02 | Forced stop | External input forces the indoor unit to stop until the signal is released. |
| 03 | Operation / Stop mode 2 | External stop disables remote-controller operation while stopped. |
CN2 input electrical condition: DC 12–24 V, 1–15 mA. Use twisted-pair cable, maximum 150 m, and route separately from power wiring.
Indoor external output – CN3
CN3 provides a selectable 12 V DC status output. Use Function 60 to select the output function.
| Function 60 | Output |
|---|---|
| 00 | Operation status |
| 09 | Error status |
| 10 | Indoor fan operation status |
CN3 output: High = DC 12 V ± 2 V, Low = 0 V, permissible current 50 mA. Twisted pair cable maximum 25 m.
Group control
- Up to 16 indoor units can be controlled from one wired remote controller.
- Maximum total remote-controller cable length for group control is 300 m.
- Cable size: up to 100 m = 0.3–0.8 mm²; 100–200 m = 0.5–0.8 mm²; 200–300 m = 0.8 mm².
- Each indoor unit must have a unique remote-controller address using Function 00, values 00–15.
Optional controllers and connection parts
| Part | Model | Use |
|---|---|---|
| Wired remote controller | UTY-RVNYN | Polar 3-wire wired controller; communication kit required. |
| Simple remote controller | UTY-RSNYN | Basic start/stop, mode, fan and temperature control; communication kit required. |
| External connect kit | UTY-XWZX | Connection to indoor PCB external input/output functions. |
| Communication kit | UTY-XWNX | Connection for Polar 3-core wired remote controller. |
AOTG34CMTB outdoor external I/O
The outdoor external input/output functions below apply to AOTG34CMTB only in this technical manual.
| Connector | Function |
|---|---|
| CN10 | Low noise mode input |
| CN11 | Peak cut mode input |
| CN12 | Error status output |
| CN13 | Compressor status output |
Outdoor external connection uses optional kit UTY-XWZXZ3. Low noise and peak cut inputs use a contact input and must be within 10 m of the PCB. Outdoor status outputs require an external power supply of DC 24 V or less and a load of DC 500 mA or less.
6. Indoor function settings
Caution: Incorrect function settings can cause incorrect operation. Record the original settings before making changes.
Entering function setting mode using the wireless remote
- While pressing POWERFUL and TEMP ▲ together, press RESET.
- Select the function number with the TEMP buttons. Use ECONOMY to move between digits.
- Press POWERFUL to move to the setting value.
- Select the setting value with the TEMP buttons.
- Press MODE once and confirm the beep.
- Press START/STOP to save and confirm the beep.
- Press RESET to exit.
- Disconnect power, wait at least 30 seconds, then reconnect power to activate the setting.
Common function settings
| Function | Purpose | Key values |
|---|---|---|
| 00 | Remote controller address | 00–15 = Unit 0–15 |
| 11 | Filter sign interval | 00 = 400 h, 01 = 1,000 h, 02 = 200 h, 03 = No indication (factory) |
| 30 | Indoor room sensor correction | Correction range -4.0°C to +4.0°C; 00 = standard factory setting |
| 35 | Wired remote sensor correction | Correction range -4.0°C to +4.0°C; requires Function 42 = 01 |
| 40 | Auto restart after power interruption | 00 = Enable (factory), 01 = Disable |
| 42 | Room temperature sensor switching | 00 = Indoor unit (factory), 01 = Both indoor and wired remote |
| 44 | Wireless remote custom code | 00 = A (factory), 01 = B, 02 = C, 03 = D |
| 46 | External input control | 00 = Op/Stop 1, 02 = Forced stop, 03 = Op/Stop 2 |
| 48 | Room sensor switching – auxiliary | 00 = Both (factory), 01 = Wired remote only; Function 42 must be 01 |
| 49 | Indoor fan energy saving during cooling | 00 = Disable, 01 = Enable, 02 = Remote controller (factory) |
| 60 | External output selection | 00 = Operation, 09 = Error, 10 = Indoor fan status |
7. Installation clearances – indoor unit
- Top clearance: 88 mm or more.
- Side clearance: 50 mm or more each side.
- Additional side service allowance shown in the manual: 70 mm or more left and 140 mm or more right.
- Front clearance: 1,500 mm or more.
- Installation height shown: 1,800 mm or more from floor level.
8. Service notes
- Indoor fan fuse: 250 V, 3.15 A on the indoor PCB.
- Outdoor units contain 25 A, 10 A and 3.15 A fuse protection as listed in the technical manual.
- High-pressure protection activates at approximately 4.2 MPa and resets at approximately 3.2 MPa.
- Low-pressure protection activates at 0.12 MPa and resets at 0.15 MPa.
- Cooling performance reduces as pipe length and height difference increase; refer to the detailed capacity compensation table in the technical manual when checking long-pipe applications.
Reference: Design & Technical Manual DR_AS048EF_07, dated 10 July 2020. Product specifications and design may change without notice. Use the latest installation and technical documentation when completing field work.