Brand: FUJITSU GENERAL
Category: Air Conditioner
Document Type: Manual
Language: EN
Manual for V-II
Uploaded: Nov. 21, 2025, 6:58 p.m.
Manual Publish Date: 2009-06-09
- 1. TEST RUN: Procedures and precautions for initial setup and verification of the air conditioning system. This includes checks before and after power on, test runs from the outdoor PC board or remote controller, and field setting adjustments.
- 2. OUTDOOR UNIT OPERATION CONTROL: Details on how the outdoor unit operates, covering compressor and fan control, expansion valve operation, and protective functions.
- 3. INDOOR UNIT OPERATION: Explains indoor unit functions like fan control, master control modes (Cool, Heat, Auto Changeover), louver control, electronic expansion valve, drain pump, various functions (Auto Restart, Icing Protection), and timer controls.
- 4. TROUBLE SHOOTING: Guides for diagnosing and resolving issues during normal and abnormal operation, including error code lists and troubleshooting steps for various components.
- 5. APPENDING DATA: Provides supplementary information such as refrigerant circuits, wiring diagrams, and sensor characteristics.
- 6. DISASSEMBLY PROCESS: Step-by-step instructions for disassembling the outdoor unit for maintenance or repair, covering panel removal, control box access, and component removal (PCB, fan motor, compressor, etc.).
Troubleshooting and error codes
| Procedure | Check contents | Judgment standard | Check |
|---|---|---|---|
| Power source | Circuit breaker capacity | Outdoor unit: 50A (AJ*144/126/108), 30A (AJ*90/72) | |
| Power source | Indoor unit: 20A | ||
| Power source | Type of power source wiring | Circuit breaker: 30A=4mm², 50A=10mm², 60A=16mm², 80A=22mm², 100A=38mm² | |
| Power source | Outdoor unit: 10mm² (AJ*144/126/108), 4.0mm² (AJ*90/72) | ||
| Power source | Indoor unit: 2.5mm² | ||
| Power source | Supply power source | Using a phase tester, etc., check the phase of the power source. | |
| Power source | Outdoor unit side: Between R-S AC 400V (380-415V) Between S-T AC 400V (380-415V) Between T-R AC 400V (380-415V) Indoor unit side: AC 230V (220-240V) |
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| Outdoor unit | Appearance | Shall be no scratches, deformation, etc. (Be careful of deformation of the front panel) | |
| Outdoor unit | Serial No. | Shall be checked and entered in the check sheet. | |
| Outdoor unit | Outside air temperature | Shall be checked and entered in the check sheet. | |
| Outdoor unit | Power source wiring connection | Connection points check & loose terminal panel screws check | |
| Outdoor unit | Type of communication line | 0.33mm², shielded wire used (22AWG) | |
| Outdoor unit | Communication line connection | Connection points check & loose terminal panel screws check | |
| Outdoor unit | Connection piping | Check whether or not the heat insulation material is installed without a gap. | |
| Outdoor unit | DIP-SW setting | Outdoor unit address setting (SET: 3-1, 2) Setting for number of slave units (SET: 3-3, 4) Number of outdoor units installed (SET: 5-1, 2) Terminal resistor setting (SET: 5-4) |
|
| Outdoor unit | Rotary SW setting | Refrigerant circuit address setting (SET: REF AD ×10 &×1) | |
| Outdoor unit | Additional refrigerant amount | Comparison of calculated value and value written on electrics box. Entered in check sheet. | |
| Outdoor unit | 3-way valve | MASTER: Gas pipe shall be full-open. MASTER: Liquid pipe shall be full-open. SLAVE1: Gas pipe shall be full-open. SLAVE1: Liquid pipe shall be full-open. SLAVE2: Gas pipe shall be full-open. SLAVE2: Liquid pipe shall be full-open. |
|
| Indoor unit | Appearance | There shall be no scratches, deformation, tilting, etc. | |
| Indoor unit | Serial No. | Shall be checked and entered in the check sheet. | |
| Indoor unit | Drain cap installation | Shall be installed positively. | |
| Indoor unit | Power source wiring connection | Connection points check & loose terminal panel screws check | |
| Indoor unit | Type of communication line | 0.33mm², shielded wire used (22AWG) | |
| Indoor unit | Communication line connection | Connection points check & loose terminal panel screws check | |
| Indoor unit | Type of remote controller wiring | 0.33mm² | |
| Indoor unit | Remote controller wiring connection | Connection points check & loose terminal panel screws check | |
| Indoor unit | Connection piping | Check whether or not the heat insulation material is installed without a gap. | |
| Indoor unit | DIP-SW setting | Refrigerant circuit address (REF AD) Indoor unit address (IU AD) At automatic address setting, IU AD/REF AD shall be [0]. Remote controller address (RC AD) Function setting (Remote controller custom code/ external input switching/auxiliary heater ON-OFF) |