Overview
This document outlines the factory and configurable DIP switch settings for both the indoor and outdoor units of Fujitsu LUAK and LJBYL series systems. These settings govern key operational parameters such as temperature correction, auto restart, mode selection, and fan speed configuration.
1. Indoor Unit DIP Switch Settings
SW1 (Factory Reserved)
| Switch No. | OFF | ON | Description |
|---|---|---|---|
| 1–4 | — | ★ | Out of use / Factory default |
Note: SW1 switches are not used for field adjustment.
SW2 (Indoor Unit Functional Adjustments)
| Switch No. | OFF | ON | Function |
|---|---|---|---|
| 1 | +4 °C | 0 °C | Room temperature correction (heating) |
| 2 | Edge | Pulse | Control input signal setting |
| 3 | Validity | Invalidity | Auto restart function enable/disable |
Field Guidance:
Use SW2-1 for minor calibration of heating temperature offset (+4 °C correction available).
SW2-2 determines input method for external control (Edge/Pulse).
SW2-3 enables the Auto Restart function after power failure when set to OFF (Validity).
Jumper Wire Settings (JM1–JM3)
| Jumper | Connected | Disconnected | Function |
|---|---|---|---|
| JM1 | 0 °C | +2 °C | Room temp correction (cooling) |
| JM2 | Residential | Commercial | Selects commercial mode operation |
| JM3 | Normal | Heater setting | Enables heater mode operation |
Field Tip:
Adjust JM1 to +2 °C if occupants report overcooling under typical ambient conditions.
Set JM2 to “Commercial” when integrating with BMS or third-party control systems.
2. Remote Control DIP and Jumper Settings
| Switch / Jumper | OFF | ON | Description |
|---|---|---|---|
| SW1-1 | — | ★ | Dual remote controller mode |
| SW1-3 | One Unit | Multiple Unit | Group control configuration |
| SW1-4 | Heat & Cool | Cooling Only | Model type selection |
| SW1-5 | Invalidity | Validity | Auto changeover activation |
| SW1-6 | Invalidity | Validity | Memory backup enablement |
| J5 (Fan Speed) | 3-speed (HI, MED, LO) | 1-speed (HI) | Fan speed mode (AR90 only) |
Factory default: Single unit, heat & cool model, 3-speed fan operation.
3. Outdoor Unit DIP Switch Configuration
Used primarily for setting maximum current capacity and thermal protection calibration.
| DIP No. | 1 | 2 | 3 | Max Current (A) | Model Reference |
|---|---|---|---|---|---|
| OFF OFF OFF | 17.5 A | 36,000 BTU (factory) | |||
| ON OFF OFF | 15.0 A | 30,000 BTU (factory) | |||
| OFF ON OFF | 13.0 A | Reduced performance mode | |||
| ON ON OFF | 10.5 A | Low power protection mode |
⚠️ Caution:
Do not set a 30,000 BTU model to 17.5 A — this may disable protection devices and prevent operation.
Reducing the current limit below the factory value will decrease cooling and heating performance.
4. Field Implementation Notes
Always power down the system before changing DIP or jumper settings.
Record all modifications on the commissioning sheet for traceability.
If settings are incorrect, unit may display fault codes relating to mode conflict or sensor calibration error.
Ensure both indoor and outdoor settings correspond to the unit’s rated model (LUAK or LJBYL).