Fujitsu General NZ Assist

Important: DIP switch configuration on the outdoor unit control printed circuit board must match the physical model. Incorrect DIP switch settings can cause abnormal operation.

Attachments

TEST RUN

Test Run – Key Preconditions

• Supply power to the system for 12 hours prior to starting operation if the outdoor temperature is lower than 20°C.
• Confirm there are no abnormal sounds or vibration during test run operation.
• Perform the test operation for 60 minutes.

Test Run from Outdoor Unit Control Printed Circuit Board (Outdoor Unit DIP Switch SW1-1 and SW1-2)

By setting DIP switch SW1-1 and SW1-2 on the outdoor unit control printed circuit board, cooling test run or heating test run for all indoor units in the same refrigerant system can be performed.

Outdoor Unit SW1-1Outdoor Unit SW1-2

• Normal operation: SW1-1 = OFF and SW1-2 = OFF
• Normal operation: SW1-1 = ON and SW1-2 = ON
• Heating test run: SW1-1 = ON and SW1-2 = OFF
• Cooling test run: SW1-1 = OFF and SW1-2 = ON

Test Run from Remote Controller

Standard wired remote controller: Stop the indoor unit. Press FAN CONTROL and MASTER CONTROL simultaneously for more than two seconds to start test run. To stop, press START/STOP.

Standard wireless remote controller: Short the two metallic points in the test run frame while the air conditioner is running. To stop, press START/STOP.

Simple remote controller: Stop the indoor and outdoor units. Press SET and the relevant key combination simultaneously for more than three seconds to start test run. To stop, press the stop key.

Behaviour During Test Run

• The electric expansion valve is controlled to maximum flow regardless of temperature condition.
• Defrosting and frost prevention operations have priority over test run behaviour.
• After 60 minutes, the test run stops.
• During indoor unit test run, the OPERATION and TIMER lamps of the indoor unit flash slowly at the same time.

FUNCTION AND SETTING OF EACH SWITCH

Outdoor Unit DIP Switch SW1 – Test Run, Pump Down, Oil Recovery

• SW1-1 and SW1-2: Used for cooling test run and heating test run modes (see TEST RUN section).
• SW1-3 (Pump down operation): OFF = Release; ON = Operate. Set OFF → ON and keep ON for more than 40 seconds to start pump down automatically.
• SW1-4 (Forced oil recovery operation): OFF = Release; ON = Operate. Set OFF → ON and keep ON for more than 10 seconds.

Outdoor Unit DIP Switch SW2 – Silent Operation Mode and Current Limiting

• SW2-1 (Silent operation mode): ON = Operate; OFF = Release. Silent operation mode is for noise reduction at night (cooling mode only).
• SW2-2: Setting forbidden (do not change).
• SW2-3 and SW2-4 (Electric current selector switch 1 and 2): Upper limit of electric current is set according to current limit. Breaker capacity can be selected in 4 steps depending on local power supply condition:
• 30 A: SW2-3 = ON, SW2-4 = ON
• 25 A: SW2-3 = OFF, SW2-4 = OFF
• 20 A: SW2-3 = OFF, SW2-4 = ON
• 15 A: SW2-3 = ON, SW2-4 = OFF

Outdoor Unit DIP Switch SW3 and SW4

• SW3-1 / SW3-2 / SW3-3 / SW3-4: Setting forbidden (do not change).
• SW4-1 / SW4-2 / SW4-3 / SW4-4: Setting forbidden (do not change).

Outdoor Unit DIP Switch SW5 – Cooling and Heating Capacity Shift

The cooling and heating capacity can be changed by using these switches.

• Cooling capacity shift (SW5-1 and SW5-2):
• Normal mode: SW5-1 = OFF, SW5-2 = OFF
• Save energy mode: SW5-1 = ON, SW5-2 = ON
• High power mode 1: SW5-1 = OFF, SW5-2 = ON
• High power mode 2: SW5-1 = ON, SW5-2 = OFF
• Heating capacity shift (SW5-3 and SW5-4):
• Normal mode: SW5-3 = OFF, SW5-4 = OFF
• Save energy mode: SW5-3 = ON, SW5-4 = ON
• High power mode 1: SW5-3 = OFF, SW5-4 = ON
• High power mode 2: SW5-3 = ON, SW5-4 = OFF

Outdoor Unit DIP Switch SW6 – Pipe Length Compensation and Defrost Temperature Shift

Pipe length compensation: Switch setting can provide operation to supplement the loss created by pipe length.

• SW6-1 and SW6-2 (Pipe length): Set according to the actual pipe length “L”. Recommended ranges are provided by the manual (ensure “L” aligns with the system design limits).
• SW6-3 and SW6-4 (Defrost temperature shift): Used to change defrost start and finish temperatures depending on frost condition and surrounding environment.

Outdoor Unit DIP Switch SW7 – System Type, Model Code, Refrigerant Type

SW7 has been set up at the factory. There is no need to set it up at the installation site unless replacing a service printed circuit board and confirming correct settings.

• SW7-1 (System type selection): OFF = Heat pump type; ON = Cooling only type.
• SW7-2: Setting forbidden (do not change).
• SW7-3 (Model code): Set for model code “54” (factory setting). ON position is forbidden.
• SW7-4 (Refrigerant type): R410A (factory setting).

Indoor Unit DIP Switch Notes (Where Applicable)

This manual also contains indoor unit switch references for certain indoor unit types (for example compact wall mounted). Ensure you only apply indoor unit DIP switch settings to the correct indoor unit model family and always use full indoor unit model identification for field workpacks.

Outdoor Unit Model DIP Switch 7-1 Sanity Check (Critical When Replacing Service Printed Circuit Board)

• SW7-1 = ON: AO54FJAMR (Cooling only) (note: AO54FJAMR does not have a heat exchanger thermistor (Outlet)).
• SW7-1 = OFF: AO54UJAMR (Heat pump).

ADDITIONAL CHARGE

Additional Refrigerant Charge Calculation (Text Formula)

Additional refrigerant is calculated from total liquid pipe lengths by diameter:

• For liquid pipe outer diameter 9.52 mm: additional refrigerant = 0.06 kg per meter
• For liquid pipe outer diameter 6.35 mm: additional refrigerant = 0.02 kg per meter

Additional charge C (kg) = (Total length of 9.52 mm liquid pipe in meters × 0.06) + (Total length of 6.35 mm liquid pipe in meters × 0.02) − 1.8

Decision rule: If C > 0, add refrigerant amount C. If C ≤ 0, no additional charge is required.

Worked Example (As Provided)

If liquid pipe length 9.52 mm = 35 m and liquid pipe length 6.35 mm = 20 m:

C = (35 × 0.06) + (20 × 0.02) − 1.8 = 0.7 kg

Installation and Refrigerant Handling Controls (Operational Governance)

• Do not purge air with refrigerant; use a vacuum pump to remove air from indoor units and connection pipes.
• Vacuum to -76 cmHg and operate the vacuum pump for at least 1 hour after reaching -76 cmHg.
• Always use an electronic balance to charge by weight.
• Always charge from the liquid phase side (composition stability).
• Record the added refrigerant amount and calculation on the service label on the side panel for after-service purposes.

PUMP DOWN METHOD

Procedure of the Pump Down (Text Version)

1. Stop the indoor and outdoor units.
2. Close the liquid pipe valve using a hexagon wrench.
3. Set outdoor unit DIP switch SW1-3 from OFF to ON; pump down operation starts automatically in 40 seconds.
4. If pump down operation completes normally, the LED on the outdoor unit printed circuit board will light and flash to inform completion.
5. After confirming the LED display type, close the gas pipe valve, then set DIP switch SW1-3 from ON to OFF immediately.

Pump Down Operational State Summary (Text Version)

• After SW1-3 OFF → ON and 40 seconds standby: compressors operate and outdoor fan runs at high speed.
• When pump down completes: all compressors stop, and LED indicates completion.
• If pump down abnormal occurs: LED indicates error; close valves per procedure and return SW1-3 to OFF after securing system state.

Pump Down Flow (Text Version Extract)

• Pump down start: electronic expansion valve full open.
• Finish criteria includes low pressure less than 0.2 MPa or time progress (example noted as 5 minutes progress), with LED confirmation sequence.
• Safety condition examples include discharge temperature 115°C over and pressure switch 1 OFF at 4.2 MPa over causing compressor stop.