General Assist Technical Reference
ABT36RBA3W / AOT36RPA3L Ceiling Type
Specifications, R22 charge, piping, fault diagnosis, remote-control coding and service parts
Legacy 10.3-10.5 kW cooling / 10.5-10.7 kW heating ceiling-mounted reverse-cycle system
This article summarises the principal technical and service information for the ABT36RBA3W indoor unit matched with the AOT36RPA3L outdoor unit. The same service documentation also covers ABG36RBA3W/AOG36RPA3L and ABY36RBA3W/AOY36RPA3L variants.
Legacy R22 equipment: This product is covered by 2003 service documentation and uses R22 refrigerant. Confirm current refrigerant, regulatory and parts requirements before service work. Electrical and refrigerant work must be completed by appropriately qualified personnel.
1. Quick answer
| Indoor unit | ABT36RBA3W |
| Outdoor unit | AOT36RPA3L |
| System type | Ceiling-mounted, reverse cycle |
| Cooling capacity | 10.3-10.5 kW |
| Heating capacity | 10.5-10.7 kW |
| Power supply | 380-415 V, 3 phase, 50 Hz |
| Refrigerant | R22 |
| Base refrigerant charge | 3,000 g; no additional charge required up to 20 m |
| Additional charge | 40 g per metre above 20 m |
| Pipe sizes | Liquid 9.52 mm (3/8 in); gas 19.05 mm (3/4 in) |
| Maximum charge-table pipe length | 50 m |
2. Key specifications
| Item | Cooling | Heating |
|---|---|---|
| Capacity | 10.3-10.5 kW | 10.5-10.7 kW |
| Running current | 7.0 A | 6.2-6.3 A |
| Input | 4.00-4.10 kW | 3.45-3.50 kW |
| EER / efficiency value | 2.58-2.56 kW/kW | 3.04-3.06 kW/kW |
| Technical item | Specification |
|---|---|
| Air circulation - high | 1,660 m³/h |
| Moisture removal | 4.0 L/h |
| Compressor | Hermetic, 2-pole, 3-phase induction motor; code ZR48K3-TFD-501 |
| Indoor fan speeds | High 1,000 rpm; Medium 900 rpm; Low 750 rpm |
| Outdoor fan | MFB-362FT; high speed 770 rpm |
| Indoor dimensions | 240 x 1,660 x 700 mm (H x W x D) |
| Outdoor dimensions | 1,152 x 940 x 370 mm (H x W x D) |
| Indoor gross / net weight | 61 / 48 kg |
| Outdoor gross / net weight | 114 / 100 kg |
3. R22 refrigerant charge and piping
| Pipe length | Total full charge |
|---|---|
| 5 m | 3,000 g |
| 10 m | 3,000 g |
| 20 m | 3,000 g |
| 25 m | 3,200 g |
| 30 m | 3,400 g |
| 40 m | 3,800 g |
| 50 m | 4,200 g |
Charge rule: No additional refrigerant is required up to 20 m. For intermediate lengths above 20 m, use 40 g/m additional R22 as the manual's criterion.
| Pipe | Size |
|---|---|
| Liquid / small pipe | 9.52 mm (3/8 in) |
| Gas / large pipe | 19.05 mm (3/4 in) |
Refrigerant circuit components
The reverse-cycle circuit shown in the service manual includes the evaporator, distributor, electronic expansion valve, strainer, dryer, accumulator, compressor, muffler, four-way valve, high-pressure switch and outdoor condenser.
4. Fault diagnosis
Indoor faults are indicated by the OPERATION, TIMER and VERTICAL SWING lamps. During test running, all three lamps flash slowly together. The manual identifies the following diagnostic categories:
| Area | Faults covered |
|---|---|
| Control / memory | Indoor EEPROM abnormal; outdoor EEPROM abnormal |
| Indoor sensors | Room-temperature sensor open/short; indoor heat-exchanger sensor open/short |
| Indoor operation | Float switch operated; indoor fan abnormal |
| Communication | Indoor signal abnormal; outdoor signal abnormal |
| Outdoor supply | Outdoor power-source connection abnormal |
| Outdoor sensors | Heat-exchanger, outdoor-temperature and discharge-pipe sensors open/short |
| Protection | Outdoor high-pressure abnormal; outdoor discharge-pipe temperature abnormal |
Outdoor PCB LEDs
The outdoor PCB uses LED1 to LED6 for fault indication. The service manual provides specific LED patterns for 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.
When a fault clears, the LED normally turns off. For discharge-pipe temperature abnormal and high-pressure abnormal, the indication may remain latched for up to 24 hours while power remains on.
Three-phase check: A power-source connection abnormal should include confirmation of the 380-415 V three-phase supply and correct phase/power connections before progressing to component replacement.
5. Remote-control custom code switching
The indoor PCB and wireless remote can be matched to custom codes A, B, C or D. The remote and PCB settings must agree.
| JM2 | JM3 | Remote code |
|---|---|---|
| Connected | Connected | A - primary setting |
| Connected | Disconnected | B |
| Disconnected | Connected | C |
| Disconnected | Disconnected | D |
Remote setting procedure:
- 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: If the remote custom code does not match the indoor PCB jumper setting, the remote will not operate the air conditioner.
6. Common service parts
ABT36RBA3W indoor unit
| Component | Part number |
|---|---|
| Air filter | 9359739005 |
| Fan motor capacitor | 9703306068 |
| Sirocco fan assembly | 9359701002 |
| Indoor fan motor assembly | 9360457004 |
| Room thermistor assembly | 9703299025 |
| Controller PCB assembly | 9704557391 |
| Indicator PCB assembly | 9702260019 |
| Remote control unit | 9371190013 (AR-JW1) |
| Horizontal step motor | 9360479013 |
| Vertical step motor | 9360307026 |
AOT36RPA3L outdoor unit
| Component | Part number |
|---|---|
| Compressor-C assembly | 9371396033 |
| Outdoor fan motor assembly | 9600832028 |
| Controller PCB assembly | 9704764133 |
| Pressure switch | 9704045003 |
| Solenoid coil | 9900165024 |
| 4-way valve | 9900164010 |
| Expansion valve | 9900170011 |
| Expansion valve coil | 9900172015 |
| Thermistor assembly | 9900129019 |
| Magnetic relay | 9900078010 |
| Belt heater | 9361140066 |
Parts note: These are original service-manual part numbers. Always check current supersessions and availability before ordering.
7. Service notes
- The outdoor unit uses two fan motors and an electronic control board with LED fault indication.
- The outdoor circuit includes a high-pressure switch, electronic expansion valve, four-way valve, belt heater and discharge/outdoor/pipe thermistors.
- At low outdoor temperatures, the manual notes that outdoor fan speed may reduce or one fan may stop intermittently.
- The indoor PCB includes custom-code switching, room and pipe thermistor inputs, fan control and horizontal/vertical louver step-motor outputs.
- The indoor unit uses a T3.15 A 250 V fuse on the indoor power/control circuit; the outdoor circuit diagram identifies a 6.3 A fuse.
- Use the original service manual for exact circuit diagrams, PCB test points, LED flash combinations, disassembly locations and full parts breakdowns.
Reference: Split Type Room Air Conditioner - Ceiling Type (50 Hz), ABG36RBA3W / ABY36RBA3W / ABT36RBA3W with AOG36RPA3L / AOY36RPA3L / AOT36RPA3L, service documentation dated December 2003.