5.5 Fitting pipe between Outdoor Unit and the First Manifold ............................................. 43
6 Pipe Installation and Insulation .......................................................................... 49
6.1 Pipe Installation for the Cooling System ....................................................................... 49
6.2 Pipe Installation for the Condensate Water System ...................................................... 58
6.3 Insulation System .......................................................................................................... 62
7 Electric and Controller Installation .................................................................... 63
7.1 Precautions ................................................................................................................... 63
7.2 Installation of the Power Cable ..................................................................................... 64
7.3 Installation of the Communication System .................................................................... 66
8 Vacuumization and Desiccation for the Refrigerant System ........................... 68
8.1 Air-tightness Test ........................................................................................................... 68
8.2 Vacuumization and Desiccation for the System ............................................................ 69
9 Refrigerant Perfusion .......................................................................................... 70
9.1 Calculation Method for Perfusing Refrigerant ............................................................... 70
9.2 Method for Perfusing Refrigerant .................................................................................. 72
Chapter 3 Commissioning Operation ................................................................... 74
1 Security Requirements ........................................................................................ 74
1.1 Precautions for Construction ......................................................................................... 74
1.2 Precautions for the Use of Refrigerants ........................................................................ 74
2 Introduction to Unit Functions ........................................................................... 74
2.1 System Function DIP Switch Settings ........................................................................... 74
2.2 System Function Button Operations ............................................................................. 80
3 Commissioning Process ..................................................................................... 95
3.1 Necessity of VRF Engineering Commissioning ............................................................ 96
3.2 Required Files and Tools for Engineering Commissioning ........................................... 96
3.3 Engineering Commissioning Procedures ...................................................................... 96
3.4 References for Proper Unit Operation Parameters ..................................................... 119
Chapter 4 Maintenance ........................................................................................ 122
Part 1 Failure Code Table ..................................................................................... 122
1 System Failure Code Table ............................................................................... 122
Part 2 Exception and Troubleshooting ............................................................... 126
2 Exception Analyzing and Troubleshooting ........................................................... 126
2.1 Form analyzing ........................................................................................................... 126
2.2 Gas-mixing protection of 4-way valve ......................................................................... 134
3 Key Parts Maintenance ..................................................................................... 236
3.1 Cautions on Controller AP1 Replacement .................................................................. 236
3.2 Compressor Replacement and Cautions .................................................................... 241
3.3 Cautions on Compressor Drive Replacement ............................................................. 266
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