Fujitsu General NZ Assist

1) Safety and compliance

• Confirm safe electrical isolation before opening covers or touching electrical components. Follow lockout/tagout practices where applicable.
• Allow discharge time after power-off before touching electrical components (inverter systems can retain charge).
• Use appropriate PPE: safety glasses, cut-resistant gloves (sheet metal edges), and hearing protection when required.
• Maintain site safety controls: exclusion zone, controlled work process, and “no ignition sources” approach when working with flammable refrigerant systems.

2) R32 refrigerant requirements

R32 handling essentials

• Use refrigerant detection suitable for flammable refrigerants (non-sparking / intrinsically safe).
• Ventilation: avoid working in confined spaces. Maintain airflow and keep the area controlled.
• Eliminate ignition sources: no hot work unless the refrigerant circuit is proven safe and controlled under your procedure.
• Use correct recovery practices and cylinders rated/approved for R32.

Factory charge reference (R32)

• AOTH30KMTD factory charge: 1700 g
• AOTH34KMTD factory charge: 2300 g

3) Tools and materials (R32/R410A rated)

Core refrigeration tools

• R32/R410A rated manifold and hoses (with low-loss fittings preferred)
• Vacuum pump suitable for HVAC commissioning + vacuum rated hoses
• Micron gauge / vacuum gauge for verification
• Dry nitrogen cylinder with regulator (pressure testing)
• Electronic refrigerant scale (charging by weight)
• Approved refrigerant recovery unit and recovery cylinder for R32
• Leak detection suitable for flammable refrigerants

Installation / service tools

• Tube cutter, reamer/deburrer, flaring tool (correct type for flare specification used)
• Torque wrench for flare nuts (use manufacturer torque values where specified)
• Insulation (closed-cell), UV-resistant tape, pipe clamps/supports
• Electrical test equipment: multimeter, insulation resistance tester (as per your procedure), clamp meter

4) System overview (power, control, commissioning flow)

Power and control architecture

• System power supply is fed into the outdoor unit (power supply intake: outdoor unit).
• The indoor unit is powered from the outdoor unit (system design).
• Indoor/outdoor communications faults commonly present as E:11 / E:12 / E:18 / E:3A error codes (see Section 14).

Recommended commissioning flow (high-level)

1. Confirm correct installation clearances, mounting security, and drain arrangements.
2. Confirm correct wiring (earth, polarity, terminals tight, correct cable routing).
3. Refrigerant piping: correct pipe sizes, correct flares, insulation, and supports.
4. Pressure test with dry nitrogen, then evacuate and confirm vacuum stability.
5. Open service valves, perform test run, verify operation, then complete handover.

5) Refrigerant piping requirements

Mandatory pipe sizes (explicit by model)

• ASTH30KMTD piping: liquid pipe OD 9.52 mm; gas pipe OD 15.88 mm.
• ASTH34KMTD piping: liquid pipe OD 9.52 mm; gas pipe OD 15.88 mm.
• AOTH30KMTD piping connections: liquid pipe OD 9.52 mm; gas pipe OD 15.88 mm.
• AOTH34KMTD piping connections: liquid pipe OD 9.52 mm; gas pipe OD 15.88 mm.

Maximum piping limits (explicit by model)

• AOTH30KMTD maximum pipe length: 25 m. Maximum height difference: 20 m. Pre-charge length: 20 m.
• AOTH34KMTD maximum pipe length: 25 m. Maximum height difference: 20 m. Pre-charge length: 20 m.

Good practice notes

• Insulate both liquid and gas lines where required by your installation standard and local conditions.
• Support pipework to prevent vibration transfer and rubbing contact noise.
• Keep bends smooth; avoid kinks; maintain cleanliness (cap/plug during install).

6) Electrical requirements

Supply requirements (system)

• System power supply: 220–240 V~ 50 Hz.
• Available voltage range: 198–264 V.
• Power supply intake: Outdoor unit (AOTH30KMTD / AOTH34KMTD).

Service checks

• Confirm earth continuity and correct polarity as applicable.
• Confirm all terminals are tight and conductors are correctly seated (no copper showing beyond clamp).
• Confirm interconnect wiring integrity between indoor and outdoor units before diagnosing control boards.

7) Outdoor unit installation

• Install on a stable, level base with appropriate anti-vibration measures.
• Maintain service access: ensure room to remove covers, access valves, and access the control PCB area.
• Ensure outdoor airflow is not obstructed and that recirculation is minimised.
• Route condensate / defrost water appropriately (where applicable).

8) Indoor unit installation

• Mount securely to suitable structure; confirm the wall bracket is level.
• Ensure drain fall and avoid traps that can cause water leaks.
• Confirm filters and panels are correctly seated to prevent noise and airflow issues.
• Confirm cable routing does not pinch and is protected from sharp edges.

9) Pressure test, evacuation, commissioning

Pressure test (typical controlled method)

1. Confirm both service valves are closed (if applicable for your method).
2. Pressurise with dry nitrogen via service port using an appropriate regulator.
3. Leak check all joints and flare connections with suitable leak detection for flammable refrigerants.
4. Hold pressure and confirm stability before proceeding.

Evacuation

1. Connect vacuum pump with vacuum-rated hoses and a micron gauge where possible.
2. Evacuate until required vacuum is achieved per your commissioning standard.
3. Isolate and perform a standing vacuum test to confirm no moisture/leaks.

10) Additional refrigerant charging

Factory charge reference (by model)

• AOTH30KMTD factory refrigerant charge: 1700 g (R32)
• AOTH34KMTD factory refrigerant charge: 2300 g (R32)

Pre-charge length and calculation method

• Both AOTH30KMTD and AOTH34KMTD are pre-charged for piping length up to 20 m.
• Maximum permitted pipe length for both models is 25 m.

Charging process (by weight)

1. Confirm the system is leak-free and fully evacuated.
2. Charge using an electronic scale (grams) per your procedure.
3. Stabilise operation, verify performance, and re-check for leaks.

11) Indoor function settings

How to enter function setting mode (wired remote controller method)

1. While the system is operating, press START/STOP to stop operation.
2. Press MODE + FAN at the same time (hold ~2 seconds) to enter function setting mode.
3. Set the “Function number” with temperature buttons, then set the “Setting value”.
4. Press START/STOP to confirm and exit.

Function setting list (explicit text, no tables)

For ASTH30KMTD and ASTH34KMTD, use the following function numbers and setting values as required.

Function 00 – Remote controller address setting

• Setting value 00: Address 0
• Setting value 01: Address 1
• Setting value 02: Address 2
• Setting value 03: Address 3

Function 11 – Filter sign

• Setting value 00: Standard (400 hours)
• Setting value 01: Long life (1000 hours)
• Setting value 02: No indication

Function 30 – Room temperature control for indoor unit sensor

• Setting value 00: Standard
• Setting value 01: Lower control
• Setting value 02: Higher control

Function 31 – Room temperature control for wired remote controller sensor

• Setting value 00: Standard
• Setting value 01: Lower control
• Setting value 02: Higher control

Function 35 – Refrigerant leak detection (R32)

• Setting value 00: Standard
• Setting value 01: Disabled

Function 36 – Auto restart

• Setting value 00: Enable
• Setting value 01: Disable

Function 40 – Indoor room temperature sensor switching

• Setting value 00: Both (indoor unit sensor and wired remote controller sensor)
• Setting value 01: Wired remote controller sensor
• Setting value 02: Indoor unit sensor

Function 42 – Indoor room temperature sensor reading selection

• Setting value 00: Average
• Setting value 01: Only indoor unit sensor
• Setting value 02: Only wired remote controller sensor

Function 44 – Cooling room temperature setting limit

• Setting value 00: Standard (18°C)
• Setting value 01: 20°C
• Setting value 02: 22°C

Function 46 – Heating room temperature setting limit

• Setting value 00: Standard (30°C)
• Setting value 01: 28°C
• Setting value 02: 26°C

Function 48 – Fan control setting when in heating thermo-off

• Setting value 00: Standard
• Setting value 01: Stop

Function 49 – Outdoor unit low noise operation setting

• Setting value 00: Standard
• Setting value 01: Enable

Function 60 – External input control

• Setting value 00: Disabled
• Setting value 01: Forced stop (NC contact)
• Setting value 02: Forced stop (NO contact)

Function 96 – Timer setting (delay time)

• Setting value 00: 0 minutes
• Setting value 01: 30 minutes
• Setting value 02: 60 minutes
• Setting value 03: 90 minutes
• Setting value 04: 120 minutes

12) Test run and handover

Test run (practical checks)

• Confirm indoor fan operation and correct air direction control.
• Confirm outdoor fan and compressor start and stabilise.
• Confirm suction and discharge line temperatures trend correctly.
• Confirm no abnormal noise or vibration; confirm panels and guards are correctly fitted.
• Confirm drain operation and no water leaks from indoor unit.

Handover checklist

• Explain basic operation, setpoint, modes, and timer usage.
• Explain filter cleaning interval and “filter sign” behaviour (if enabled).
• Provide the customer with key do’s and don’ts for airflow and maintenance.

13) Pump down (forced cooling operation)

Typical pump-down concept (high level)

1. Run the system in cooling to pull refrigerant to the outdoor unit.
2. Close the liquid service valve, then continue operation to pump down.
3. Close the gas service valve once pressures reach the required condition per your procedure.
4. Stop the system and isolate power.

14) Error codes (indoor/outdoor consolidated)

Indoor unit + wired remote controller error codes (one line each)

Outdoor unit LED diagnostics (overview)

• If the outdoor unit LED displays an error: after confirming the ERROR LED, press the outdoor unit ENTER button once to show the error content on LED lamps.
• Use the indoor/wired controller error code above as the primary field reference because it is explicit and AI-readable.

15) How to test the various components

A) Thermistors (sensor checks)

Thermistors are NTC type. Check for open circuit, short circuit, and correct resistance vs temperature trend.

Reference points from thermistor charts (resistance in kilo-ohms):

• Discharge temperature thermistor: 0°C ≈ 168.60 kΩ; 25°C ≈ 49.84 kΩ; 50°C ≈ 17.79 kΩ
• Compressor temperature thermistor: 0°C ≈ 168.60 kΩ; 25°C ≈ 49.84 kΩ; 50°C ≈ 17.79 kΩ
• Outdoor temperature thermistor: 0°C ≈ 33.34 kΩ; 25°C ≈ 10.00 kΩ; 50°C ≈ 3.60 kΩ

B) Communication faults (E:11 / E:12 / E:18 / E:3A)

• Inspect terminals and interconnect wiring for polarity, tightness, and continuity.
• Reset power after correcting wiring; confirm error clears and stable operation.
• If wiring is correct and error persists: isolate whether controller, indoor PCB, or outdoor PCB is failing (swap-test where permitted by your procedure).

C) Fan motor faults (E:51 / E:97)

• Check for physical obstruction, blade damage, and bearing seizure.
• Confirm correct supply to motor from the PCB and secure connector seating.
• Replace the fan motor if the motor does not rotate correctly with confirmed supply and command.

D) High pressure switch (E:86)

• Confirm airflow through outdoor coil and fan operation.
• Check refrigerant circuit for overcharge, restriction, or non-condensables (use proper recovery/recharge practices).
• Test switch continuity/operation according to your service practice.

E) Inverter / IPM / PFC / overcurrent (E:63 / E:64 / E:65 / E:94 / E:95)

• Confirm supply voltage within range and stable; check for loose mains connections.
• Inspect for burnt components/odour on inverter PCB; check compressor for winding issues and insulation faults.
• Replace inverter PCB and/or compressor as indicated by the troubleshooting path and verified test results.

End of guide. This format is designed for AI retrieval: explicit model names, explicit parameters, and table-free lists.