Manual for FSG/FS3

Manual for FSG/FS3

Brand: HITACHI

Category: Air Conditioner

Document Type: Manual

Language: EN

Available Languages: EN , ES

Uploaded: Nov. 21, 2025, 7:40 p.m.

Warranty Information

None

The manual provides comprehensive troubleshooting procedures, servicing instructions for various indoor and outdoor unit components, main parts specifications, optional function details, and field work instructions for HITACHI SET-FREE FSG/FS3 air conditioning systems. It covers initial troubleshooting steps, alarm code tables, self-checking procedures, test runs, and detailed steps for removing and servicing components like compressors, fans, coils, and electrical parts. Additionally, it includes guidance on installation space, refrigerant leakage, maintenance work, and service records.

Troubleshooting and error codes

No. Check Item Action Judgement
1 Is service space sufficient? Yes No
2 Short circuit of Discharged Air? Yes No
3 Any Heat Influence Yes No
4 Is earth wire connected? Yes No
5 Refrigeration Piping Good Not Good
6 Fixing of Units Good Not Good
7 Any Damage on Outer or Internal Surface? Yes No
8 Checking of Scew and Bolts Tighten if loosen Not Tightened
9 Tightening of Terminal Screws Tighten all terminals by phillips driver Not Tightened
10 Are compressor terminals tightly fixed? Push all terminals Not Pushed
11 Insulation Resistance Measure Insulation resistance by Insulation resistance-meter. Comp. and Fan Motor: greater than 3MΩ Others: greater than 3MΩ Good Not Good
12 Does Drain Water smoothly flow? Check for smooth flow by pouring water. Good Not Good
13 Check for Leakage at compressor. Check for any Leakage Good Not Good
14 Check for Leakage at Outdoor heat exchanger ditto Good Not Good
15 Check for Leakage at Indoor heat exchanger ditto Good Not Good
16 Check for Leakage at 4-way valve ditto Good Not Good
17 Check for Leakage at check valve ditto Good Not Good
18 Check for Leakage at accumulator ditto Good Not Good
19 Check for Leakage at Strainer ditto Good Not Good
20 Check for Leakage at electronic Ex. Valve ditto Good Not Good
21 Check for Leakage at piping ditto Good Not Good
22 Check for direction of fans by Viewing or Air Flow Volume Good Not Good
23 Voltage among each Phase Higher than 220V Good Not Good
24 Vibration and Sound Check fan, compressor, piping, etc Good Not Good
25 Activation of each Operation Mode Check Activation of Cool, Heat, Stop, and Temp. switches Good Not Good
26 High Pressure Cut-out Switch Check actual activation value Good Not Good
27 Check activation of drain mechanism Check it during cooling operation Good Not Good
28 Indoor Inlet Air Temp. DB/WB (°C)DB (°C)WB Good Not Good
29 Indoor Outlet Air Temp. DB/WB (°C)DB (°C)WB Good Not Good
30 Outdoor Inlet Air Temp. DB/WB (°C)DB (°C)WB Good Not Good
31 Outdoor Outlet Air Temp. DB/WB (°C)DB (°C)WB Good Not Good
32 High Pressure Switch kg/cm²G Good Not Good
33 Low Pressure Switch kg/cm²G Good Not Good
34 Operating Voltage V Good Not Good
35 Operating Current A Good Not Good
36 Instruction for cleaning of Air Filter to client Done Not Yet
37 Instruction for cleaning of Method to client Done Not Yet
38 Instruction for Operation to client Done Not Yet
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