General Assist Technical Reference
ABT30 / ABT45 / ABT54 Ceiling Type
Legacy model matching, specifications, refrigerant charge, fault diagnosis and service information
Applies to ABT30ABA-W, ABT30RBA-W, ABT45RGC3W, ABT54ABA3W and ABT54RBA3W systems
This article summarises the key service information for the legacy ABT ceiling-mounted range, including the correct indoor/outdoor combinations, capacities, electrical data, refrigerant charge quantities, fault indications, remote-control custom codes and common service parts.
Legacy equipment: These models are from early-2000s service documentation. Confirm current parts availability and supersessions before ordering components. Electrical and refrigerant service work must be carried out by appropriately qualified personnel.
1. Correct model combinations
| Indoor unit | Outdoor unit | System type |
|---|---|---|
| ABT30ABA-W | AOT30AMBL | Cooling only |
| ABT30RBA-W | AOT30RMCL | Cooling & heating |
| ABT45RGC3W | AOT45RCG3L | Cooling & heating |
| ABT54ABA3W | AOT54APA3L | Cooling only |
| ABT54RBA3W | AOT54RPA3L | Cooling & heating |
2. Key specifications
| Model | Cooling | Heating | Supply | Cooling current | Cooling input |
|---|---|---|---|---|---|
| ABT30ABA-W / AOT30AMBL | 8.8 kW | - | 240 V, 1 ph, 50 Hz | 15.3 A | 3.40 kW |
| ABT30RBA-W / AOT30RMCL | 8.6 kW | 9.5 kW | 240 V, 1 ph, 50 Hz | 14.8 A | 3.35 kW |
| ABT45RGC3W / AOT45RCG3L | 12.7 kW | 13.7 kW | 415 V, 3 ph, 50 Hz | 7.5 A | 4.45 kW |
| ABT54ABA3W / AOT54APA3L | 14.1 kW | - | 415 V, 3 ph, 50 Hz | 8.9 A | 5.25 kW |
| ABT54RBA3W / AOT54RPA3L | 14.1 kW | 15.8 kW | 415 V, 3 ph, 50 Hz | 8.9 A | 5.25 kW |
Indoor dimensions: 240 x 1,660 x 700 mm (H x W x D).
30 class outdoor dimensions: 900 x 900 x 350 mm.
45/54 class outdoor dimensions: 1,152 x 940 x 370 mm.
30 class outdoor dimensions: 900 x 900 x 350 mm.
45/54 class outdoor dimensions: 1,152 x 940 x 370 mm.
3. Refrigerant charge by pipe length
The service manual specifies total full-charge quantities by pipe length. Use the value for the exact model and pipe length, or the stated additional-charge rate where an intermediate pipe length is used.
| Model | No additional charge up to | Additional charge | Maximum listed pipe length |
|---|---|---|---|
| ABT30ABA-W | 7.5 m | 20 g/m | 30 m |
| ABT30RBA-W | 7.5 m | 50 g/m | 25 m listed |
| ABT45RGC3W | 20 m | 40 g/m | 50 m |
| ABT54ABA3W | 20 m | 40 g/m | 50 m |
| ABT54RBA3W | 20 m | 50 g/m | 50 m |
Full-charge reference values
| Pipe length | ABT30ABA-W | ABT30RBA-W | ABT45RGC3W | ABT54ABA3W | ABT54RBA3W |
|---|---|---|---|---|---|
| 7.5 m | 2,400 g | 2,700 g | 3,500 g | 3,600 g | 3,700 g |
| 10 m | 2,450 g | 2,825 g | 3,500 g | 3,600 g | 3,700 g |
| 20 m | 2,650 g | 3,325 g | 3,500 g | 3,600 g | 3,700 g |
| 25 m | 2,750 g | 3,575 g | 3,700 g | 3,800 g | 3,950 g |
| 30 m | 2,850 g | - | 3,900 g | 4,000 g | 4,200 g |
| 40 m | - | - | 4,300 g | 4,400 g | 4,700 g |
| 50 m | - | - | 4,700 g | 4,800 g | 5,200 g |
4. Fault indication and diagnosis
The indoor unit identifies faults using the OPERATION, TIMER and VERTICAL SWING indicator lamps. During test running, all three indicators flash slowly together.
| Fault category | Manual description |
|---|---|
| Indoor electronics | Indoor EEPROM abnormal |
| Outdoor electronics | Outdoor EEPROM abnormal |
| Indoor sensors | Room-temperature sensor open/short; indoor heat-exchanger sensor open/short |
| Drain / condensate | Float switch operated |
| Communication | Indoor signal abnormal; outdoor signal abnormal |
| Fan | Indoor fan abnormal |
| Power | Outdoor power-source connection abnormal |
| Outdoor sensors | Outdoor heat-exchanger, outdoor-temperature and discharge-pipe sensors open/short |
| Protection | Outdoor high-pressure abnormal; outdoor discharge-pipe temperature abnormal |
Outdoor PCB LEDs - 45 and 54 class
The 45 and 54 class outdoor boards use LED1 to LED6 to indicate signal abnormal, indoor unit abnormal, discharge-pipe temperature abnormal, outdoor heat-exchanger temperature abnormal, outdoor temperature abnormal, power-source connection error, EEPROM abnormal and high-pressure abnormal.
Once a fault is cleared, the LED indication normally turns off. The manual notes that discharge-pipe temperature abnormal and high-pressure abnormal indications may remain continuously displayed for up to 24 hours while power remains on.
5. Remote-control custom code switching
Where multiple systems are installed in the same area, the indoor PCB and wireless remote can be matched to custom codes A, B, C or D.
| JM2 | JM3 | Custom code |
|---|---|---|
| Connected | Connected | A - primary setting |
| Connected | Disconnected | B |
| Disconnected | Connected | C |
| Disconnected | Disconnected | D |
Remote setting procedure for applicable models:
- Press START/STOP so only the clock is displayed.
- Hold MASTER CONTROL for more than five seconds to display the current signal code.
- Use the temperature adjustment button to select A, B, C or D.
- Press MASTER CONTROL again to return to the clock display.
Important: The remote-control code and indoor PCB jumper setting must match. If they do not match, the remote controller will not operate the unit.
6. Common indoor service parts
| Component | 30 class | 45 / 54 reverse-cycle class |
|---|---|---|
| Air filter | 9359739005 | 9359739005 |
| Fan motor capacitor | 9703306068 | 9703306068 |
| Sirocco fan assembly | 9359701002 | 9359701002 |
| Indoor fan motor assembly | 9360457004 | 9360457004 |
| Indicator PCB assembly | 9702260019 | 9702260019 |
| Horizontal step motor | 9360479013 | 9360479013 |
| Vertical step motor | 9360307026 | 9360307026 |
Model-specific controller PCB and remote
| Indoor model | Controller PCB | Remote control |
|---|---|---|
| ABT30ABA-W | 9704329301 | 9371190020 |
| ABT30RBA-W | 9704329295 | 9371190013 |
| ABT45RGC3W | 9704557261 | 9359913016 |
| ABT54ABA3W | 9701941247 | 9371190020 |
| ABT54RBA3W | 9704557278 | 9371190013 |
Parts note: Part numbers are taken from the original service manual. Always check for superseded numbers and current availability before placing an order.
7. Service notes
- The refrigerant circuit uses 9.52 mm (3/8 in) liquid piping across the listed models. Gas-pipe size is 15.88 mm (5/8 in) on the 30 class and 19.05 mm (3/4 in) on the 45/54 reverse-cycle systems shown in the manual.
- The 30 reverse-cycle outdoor unit uses a 4-way valve, solenoid coil, thermistors and control PCB.
- The 45 and 54 reverse-cycle outdoor units use an electronic expansion valve, 4-way valve, high-pressure switch, discharge/outdoor/pipe thermistors and dual outdoor fans.
- The manual notes that at low outdoor temperatures, outdoor fan speed may reduce and one fan may stop intermittently on applicable models.
- For three-phase 45 and 54 class systems, check supply and phase connections when diagnosing power-source connection abnormalities.
- Use the original circuit diagrams and disassembly illustrations for detailed wiring and component-location work.
Reference: Split Type Room Air Conditioner - Ceiling Type (50 Hz) service manual covering ABT30ABA-W, ABT30RBA-W, ABT45RGC3W, ABT54ABA3W and ABT54RBA3W with their matched AOT outdoor units, dated 2003. This article is a technical summary; refer to the original service documentation for detailed circuit diagrams, LED flash patterns and disassembly procedures.