JII Outdoor Unit Wiring Diagram – AJ*A36 / 45 / 54LALH
Applies to: Outdoor unit models shown on wiring diagram 5-2-2:
AJ*A36LALH, AJ*A45LALH and AJ*A54LALH.
AJ*A36LALH, AJ*A45LALH and AJ*A54LALH.
Electrical safety
This wiring diagram includes 230 V mains supply and high-voltage inverter circuitry. Isolate the unit, prove de-energised and allow stored DC voltage to discharge before accessing electrical components. Electrical testing must only be carried out by appropriately qualified service personnel using suitable test equipment.
This wiring diagram includes 230 V mains supply and high-voltage inverter circuitry. Isolate the unit, prove de-energised and allow stored DC voltage to discharge before accessing electrical components. Electrical testing must only be carried out by appropriately qualified service personnel using suitable test equipment.
Overview
The JII outdoor wiring diagram shows the complete electrical relationship between the incoming supply, noise-filter board, control board, inverter board, active power module, compressor, twin outdoor fan motors, refrigerant control components, pressure devices and thermistors.
| Item | Detail shown on diagram |
|---|---|
| Power supply | 230 V ~ 50 Hz supply with earth connection. |
| Noise-filter board | Incoming mains passes through the NOISE FILTER BOARD before feeding the main power and control circuits. |
| Fuse | F502 – 5 A / 250 V is shown in the power/control section. |
| Control board | Central control PCB for sensors, valves, fans, communications and inverter control. |
| Inverter board | Interfaces between the control/power circuitry and the compressor inverter output. |
| Active power module | High-voltage power module connected to the inverter board, choke coil and control circuitry. |
| Compressor | Three-phase inverter compressor output is identified at TM403 / TM404 / TM405 to compressor terminals R / S / C as shown on the source diagram. |
| Outdoor fans | Two outdoor fan motors are shown: Fan Motor 1 (Upper) and Fan Motor 2 (Lower). |
Refrigerant Control Components
| Component | Diagram identification | Connector shown |
|---|---|---|
| High-pressure sensor | PS | CN118 |
| Low-pressure sensor | PS | CN119 |
| Pressure switch | Pressure switch | CN120 |
| Solenoid coil 2 | SV | CN107 |
| 4-way valve coil | 4WV | CN105 |
| Crankcase heater | CRANK CASE HEATER | CN113 |
| Expansion valve coil 1 | EEV motor coil | CN116 |
| Expansion valve coil 2 | EEV motor coil | CN117 |
Thermistors
The right-hand side of the diagram identifies the thermistors by both function and TH reference:
| Reference | Function | Marking colour shown |
|---|---|---|
| TH1 | Discharge temperature | Blue |
| TH10 | Compressor shell temperature | – |
| TH7 | Subcool / heat-exchanger inlet gas | Green |
| TH8 | Subcool / heat-exchanger inlet gas | White |
| TH9 | Subcool / heat-exchanger exit gas | Brown |
| TH4 | Suction temperature | Red |
| TH5 | Outdoor air / heat-exchanger temperature circuit shown adjacent to TH4 | Pink |
| TH3 | Outdoor temperature | – |
Important: The source diagram contains several closely grouped thermistor labels. Always confirm the exact TH number, connector and physical sensor location against the original wiring diagram before disconnecting or replacing a sensor.
External Inputs / Outputs
The control board provides four external input connections and external outputs. The diagram identifies:
- EXT. IN. 1 – CN131
- EXT. IN. 2 – CN132
- EXT. IN. 3 – CN133
- EXT. IN. 4 – CN134
- EXT. OUT. 1 / EXT. OUT. 2 and pulse output connections are shown at the upper-left of the diagram.
Suggested Troubleshooting Use
- Confirm the exact outdoor model is within the AJ*A36/45/54LALH family before using this diagram.
- Start at the incoming supply. Confirm the 230 V supply and earth at the terminal block, then trace through the noise-filter board and fuse.
- For fan faults, trace the upper and lower fan motor wiring back to CN102 and CN150 on the control board.
- For pressure or refrigerant-control faults, trace the affected sensor, switch, EEV or solenoid back to the connector identified above.
- For inverter/compressor faults, trace the supply through the noise filter, inverter board, active power module and compressor connections before replacing major components.
- For thermistor faults, confirm the TH reference and marking colour before checking resistance or replacing the sensor.
Source reference: Wiring diagram section 5-2-2 Outdoor Unit, models AJ*A36,45,54LALH, drawing page 05-15.