Fujitsu General Australia

Purpose

Single reference article for specifications, dimensions, refrigerant system, wiring/PCB references, diagnostics, parts, accessories, and key service procedures for the following combinations:

• Indoor: ARTG45LHTA / ARTG54LHTA

• Outdoor: AOTG45LATL / AOTG54LATL

Index

1. Specifications

2. Dimensions

3. Refrigerant System

4. Electrical & Circuit References

5. Error Detection & Diagnostics

6. Outdoor Unit – Test Run

7. Outdoor Unit – Pump Down

8. Parts – Indoor Unit

9. Parts – Outdoor Unit

10. Accessories & Optional Parts

1) Specifications

Electrical Data (Cooling & Heating)

Power Source: 240 V, 50 Hz, Single phase

Noise Level

Fan Motor

Indoor unit discrimination: MFG-54AVN

• ARTG45LHTA fan speeds (Fan1 / Fan2): High 1040/1000 rpm, Med 880/840 rpm, Low 740/700 rpm

• ARTG54LHTA fan speeds (Fan1 / Fan2): High 1090/1050 rpm, Med 900/860 rpm, Low 780/740 rpm

Outdoor unit discrimination: MFE-45VVT

• Cool: Upper 850 rpm, Lower 800 rpm

• Heat:

  • AOTG45LATL: Upper 780 rpm, Lower 750 rpm

  • AOTG54LATL: Upper 850 rpm, Lower 830 rpm

Compressor & Refrigerant

• Compressor type: Hermetic inverter, 6 poles, 3 phase, DC motor, twin rotary

• Compressor discrimination: N-TF30HD1A

• Weight (with oil): 15.4 kg

• Refrigerant: R410A

• Precharged refrigerant: 3,350 g

• Additional charge: 40 g/m

• Max pipe height: 30 m

Pipe length / full charge reference

• 20 m: 3,350 g

• 30 m: 3,750 g

• 40 m: 4,150 g

• 50 m: 4,550 g

2) Dimensions

Indoor Unit

• H × W × D: 425 × 1,250 × 490 mm

• Weight: Shipping 61 kg / Net 54 kg

• Drain hose diameter: ID 23.4 mm / OD 25.4 mm

Outdoor Unit

• H × W × D: 1,290 × 900 × 330 mm

• Weight: Shipping 94 kg / Net 86 kg

3) Refrigerant System

Piping Sizes

• Gas pipe: 15.88 mm (5/8")

• Liquid pipe: 9.52 mm (3/8")

Key Components (Outdoor)

• Compressor, accumulator, muffler(s)

• 3-way valve(s), 4-way valve

• Pressure sensor, high pressure switch

• Expansion valve, check valve(s), strainers

Thermistors (as referenced)

• Compressor, discharge, heat exchanger (med/out), outdoor

• Room, pipe

4) Electrical & Circuit References

This section is intended as a service wiring/PCB reference map for fault tracing and component location.

Circuit Diagram Coverage

• Outdoor unit overall circuit reference

• Indoor unit overall circuit reference

• Indoor PCB circuit reference (control unit)

• Outdoor PCB circuit reference (inverter assembly / power supply / transistor PCB)

• Indicator PCB and LED/button layout references

Practical note: The detailed schematic symbol-by-symbol layouts are extensive. For deep PCB-level tracing (connector pinouts, component IDs, IC callouts), attach the source Word file to this article and reference it alongside the on-unit PCB markings.

ARTG45_54LHTA SM TC test

5) Error Detection & Diagnostics

A) Wired Remote Control – Error Code Display

If an error occurs, the wired controller displays an error code (with “Er” in the set room temperature display) and indicates the indoor unit number.

B) Indicator PCB – Error Display Mapping (Wired Remote / Lamps)

Error display references include:

• Operation lamp (green)

• Timer lamp (orange)

• Eco lamp (green)

Common code groups listed in the source include (examples):

• Serial communication error

• Wired remote control communication error

• Indoor unit capacity error

• Indoor power supply interruption

• Manual auto switch error

• Indoor fan motor driving circuit error

• Inlet air temp sensor error

• Indoor heat exchanger middle temp sensor error

• Drainage error

• Outdoor unit model information error

• Inverter error / IPM error

• Discharge / compressor / outdoor temp / heat sink temp / current sensor faults

• Pressure sensor error / high pressure switch error

• Over current / compressor control error

• Outdoor fan motor 1 / 2 error

• 4-way valve error

• Refrigerant system discharge temp error / compressor temp error / low pressure error

C) Outdoor Unit – Indicator PCB LED Pattern Table

The outdoor indicator PCB uses LED states (ON / OFF / blinking) across:

• POWER, ERROR, PUMP DOWN, LOW NOISE, PEAK CUT, MODE (L1–L6)

Workflow (field use):

1. Confirm ERROR LED is blinking.

2. Press ENTER once to step through the detail display.

3. Match the LED blink counts/states to the fault table to identify the specific error group (communication / sensor / inverter / pressure / motor / valve / refrigerant system).

6) Outdoor Unit – Test Run

Pre-checks (must be confirmed before test run)

• Outdoor unit securely installed

• Gas leak inspection completed (joints, brazing/flared connections)

• Heat insulation completed (gas pipe, liquid pipe, drain extension)

• Drain discharge confirmed OK

• Cables connected correctly and meet specification

• Earth wire correctly connected

• No airflow obstructions at suction/discharge

• Correct refrigerant charge confirmed

• Stop valves fully open (gas & liquid)

• Crankcase heater energized for more than 6 hours prior to operation

Test Run – Board Button Method (Outdoor Unit Display Board)

• Enter standby (power ON)

• Press ENTER for > 3 seconds to enter test run setting mode

• Use SELECT to toggle COOL / HEAT

  • Perform the first test run in COOL

• Press ENTER to start test operation

• To stop: press ENTER again

Operational checks during test run:

• Abnormal noise/vibration (outdoor)

• Correct discharge air temp relative to mode (indoor)

• If ERROR indication occurs, identify via LED patterns and rectify before repeating test

7) Outdoor Unit – Pump Down

Safety Warnings

• Do not touch electrical components other than the display-board buttons.

• During pump down, ensure the compressor is OFF before removing refrigerant piping.

• Do not remove connection pipes while compressor is operating with valves open (risk of abnormal pressure and injury).

Procedure (Board Button Method)

1. Confirm both 3-way valves (liquid & gas) are open.

2. Turn power ON.

3. After 3 minutes from power on, press PUMP DOWN for ≥ 3 seconds.

4. Unit runs; after ~3 minutes from compressor start, fully close the liquid-side 3-way valve.

5. When LED state changes again, fully close the gas-side 3-way valve.

6. Pump down completes; fans and compressor stop automatically.

7. Turn power OFF.

Notes:

• To stop pump down: press PUMP DOWN again.

• If pump down halts due to error: power OFF → open valves → wait 3 minutes → power ON → retry.

• If pump down cannot be completed, recover refrigerant from the service port.

8) Parts – Indoor Unit (Selected Lists)

Exterior / Chassis

• Panel Top Sub Assy: 9380191001

• Panel Rear Sub Assy: 9380205005

• Panel Side R Sub Assy: 9380194002

• Panel Side L Sub Assy: 9380203001

• Pipe Panel: 9380262008

• Drain Pan Sub Assy: 9380193005

• S Drain Pan Sub Assy: 9380204008

• Hook: 9372055007

• Remote Control: 9318593020

Fan / Motor / Controls

• Front Panel Assy: 9380271000

• Sirocco Fan: 9372059029

• Fan Motor: 9603087012

• Controller PCB Assy (45): 9708281032

• Controller PCB Assy (54): 9708281049

• Power Supply PCB Assy: 9708279015

• Filter PCB Assy: 9708277028

• Thermistor: 9704265012

• Pipe Thermistor: 9900558000

• Room Thermistor: 9703299254

• Evaporator Sub Assy: 9380206002

9) Parts – Outdoor Unit (Selected Lists)

Cabinet / Fans

• Top Panel Sub Assy: 9374417056

• Front Panel Sub Assy: 9374414109

• Service Panel Sub Assy: 9374415090

• Right Panel Sub Assy: 9374416189

• Motor DC Brushless: 9602843039

• Propeller Fan Assy: 9366378020

• Base Assy: 9374166220

• Drain Assy: 9303029015

• Drain Cap: 313166024302

Electrical (Control Box)

• Inverter PCB Assy (45): 9708690032

• Inverter PCB Assy (54): 9708690049

• Indicator PCB Assy: 9708678016

• Power Supply PCB Assy: 9708688015

• Capacitor PCB Assy: 9707257083

• ACTPM: 9707592016

• Transistor PCB Assy: 9708647043

• Thermistor (Outdoor): 9900210069

• Thermistor Assy (Heat Ex. Med/Out): 9900599027

• Thermistor Assy (Discharge/Comp): 9900598013

Refrigerant Circuit Components

• Compressor: 9810153005

• Accumulator: 9379014021

• Expansion Valve Assy: 9370947243

• Expansion Valve Coil: 9970096044

• 4-way Valve Assy: 9374425235

• Pressure Switch: 9900186012

• Sensor: 9900505080

10) Accessories & Optional Parts

Indoor Unit – Accessories

• Special nut A (Large flange) ×4 (ceiling suspension)

• Special nut A (Small flange) ×4

• Coupler heat insulation (Large) ×1 (gas pipe side)

• Coupler heat insulation (Small) ×1 (liquid pipe side)

• Binder (Large) ×4

• Binder (Medium) ×4

• Binder (Small) ×1

• Remote control ×1

• Screws (flush heads) ×2 (controller mounting)

Optional Parts

• Wired remote control: UTY-RNNYN

• Remote sensor: UTY-XSZX

• External control set: UTD-ECS5A

Outdoor Unit – Accessories

• Drain pipe ×1 (may vary by model)

• Drain cap ×2

• Binder ×3

• One-touch bush ×2 (cable installation)