Brand: HITACHI
Category: Air Conditioner
Document Type: Manual
Language: EN
Manual for SET FREE FSG(1)/FS3, FS5 SERIES AND SET FREE FXG/FX3 SERIES
Uploaded: Nov. 21, 2025, 8:47 p.m.
Manual Publish Date: 2003
Warranty Information
No specific warranty period is mentioned in the provided sections.
- Initial Troubleshooting: Covers basic checks like Rotary Switch and Dip Switch settings, electrical wiring, and 7-segment display checks. Includes procedures for emergency operation when the inverter compressor is damaged.
- Troubleshooting Procedure: Details alarm codes, troubleshooting by alarm code, and troubleshooting using the remote control switch or 7-segment display.
- Checking Main Parts: Guides on self-checking of PCBs, remote control switches, and other main components.
- Test Run: Instructions for performing test runs via remote control or outdoor unit.
- Servicing: Procedures for removing and servicing various parts of indoor and outdoor units, including compressors, fans, heat exchangers, and electrical components.
- Cleaning: Instructions for cleaning indoor unit heat exchangers for different types of units.
- Main Parts: Describes key components like the inverter, AC chopper, scroll compressor, thermistors, and electronic expansion valves.
- Optional Functions: Explains various optional functions for indoor and outdoor units, as well as remote control options.
- Field Work Instruction: Provides guidance on refrigerant leakage, maintenance work, and service/maintenance records.
- Electrical Wiring Diagrams: Illustrates wiring connections for different models.
- Control System: Details the refrigerant cycle and control system diagrams.
Troubleshooting and error codes
| No. | Check Item | Action | Judgement |
|---|---|---|---|
| 1 | Is service space sufficient? | YES or NO | |
| 2 | Short Circuit of Discharge Air? | YES or NO | |
| 3 | Any Heat Influence | YES or NO | |
| 4 | Is earth wire connected? | YES or NO | |
| 5 | Refrigeration Piping | GOOD or NOT GOOD | |
| 6 | Fixing of Units | GOOD or NOT GOOD | |
| 7 | Any Damage on Outer or Internal Surface? | YES or NO | |
| 8 | Checking of Screw and Bolts | Tighten if loosen. | TIGHTENED or NOT TIGHTENED |
| 9 | Tightening of Terminal Screws | Tighten all terminal screws by phillips driver. | TIGHTENED or NOT TIGHTENED |
| 10 | Are compressor terminals tightly fixed? | Push all terminals. | PUSHED or NOT PUSHED |
| 11 | Insulation Resistance | Measure insulation resistance by insulation resistance-meter. Comp. and Fan Motor: greater than 3MΩ Others: greater than 3MΩ | GOOD or NOT GOOD |
| 12 | Does drain water smoothly flow? | Check for smooth flow by pouring water. | GOOD or NOT GOOD |
| 13 | Check for leakage at compressor. | Check for any leakage. | GOOD or NOT GOOD |
| 14 | Check for leakage at outdoor heat exchanger. | ditto | GOOD or NOT GOOD |
| 15 | Check for leakage at indoor heat exchanger. | ditto | GOOD or NOT GOOD |
| 16 | Check for leakage at 4-way valve. | ditto | GOOD or NOT GOOD |
| 17 | Check for leakage at check valve. | ditto | GOOD or NOT GOOD |
| 18 | Check for leakage at accumulator. | ditto | GOOD or NOT GOOD |
| 19 | Check for leakage at strainer. | ditto | GOOD or NOT GOOD |
| 20 | Check for leakage at electronic Ex. Valve. | ditto | GOOD or NOT GOOD |
| 21 | Check for leakage at piping. | ditto | GOOD or NOT GOOD |
| 22 | Check direction of fans. | by Viewing or Air Flow Volume higher than 220V | GOOD or NOT GOOD |
| 23 | Voltage among each Phase. | GOOD or NOT GOOD | |
| 24 | Vibration and Sound | Check fan, compressor, piping, etc. | GOOD or NOT GOOD |
| 25 | Activation of Each Operation Mode | Check activation of COOL, HEAT, STOP and TEMP. switches. | GOOD or NOT GOOD |
| 26 | High Pressure Cut-out Switch | Check actual activation value. | GOOD or NOT GOOD |
| 27 | Check activation of drain mechanism. | Check it during cooling operation. | GOOD or NOT GOOD |
| 28 | Indoor Inlet Air Temp. (DB/WB) | °C DB/ °C WB | |
| 29 | Indoor Outlet Air Temp. (DB/WB) | °C DB/ °C WB | |
| 30 | Outdoor Inlet Air Temp. (DB/WB) | °C DB/ °C WB | |
| 31 | Outdoor Outlet Air Temp. (DB/WB) | °C DB/ °C WB | |
| 32 | High Pressure Switch | kg/cm²G | |
| 33 | Low Pressure Switch | kg/cm²G | |
| 34 | Operating Voltage | V | |
| 35 | Operating Current | A | |
| 36 | Instruction Cleaning of Air Filter to Client | DONE or NOT YET | |
| 37 | Instruction for Cleaning Method to Client | DONE or NOT YET | |
| 38 | Instruction for Operation to Client | DONE or NOT YET |