5.3 Allowable Pipe Length and Drop Height among Indoor and Outdoor Units ······················ 40
5.4 Connection Pipe among Outdoor Modules······························································· 42
5.5 Fitting pipe between Outdoor Unit and the First Manifold ············································ 43
6 PIPE INSTALLATION AND INSULATION ···························································· 48
6.1 Pipe Installation for the Cooling System ·································································· 48
6.2 Pipe Installation for the Condensate Water System ························································· 59
6.3. Requirements on Independent Drainage for Each IDU ···················································· 62
6.4. Requirements on Centralized Drainage for IDUs ··························································· 62
7 ELECTRIC AND CONTROLLER INSTALLATION ················································· 64
7.1 Precautions ······································································································ 64
7.2 Installation of the Power Cable ············································································· 65
8 Installation of Photovoltaic System ····································································· 74
8.1 Notice for Installation ·························································································· 74
8.2 Installation Project of Photovoltaic System······························································· 76
9 VACUUMIZATION AND DESICCATION FOR THE REFRIGERANT SYSTEM ············ 84
9.1 Air-Tightness Test ······························································································ 84
9.2 Vacuumization and Desiccation for the System ························································· 85
10 REFRIGERANT PERFUSION ········································································· 86
10.1 Calculation Method for Perfusing Refrigerant·························································· 86
10.2 Method for Perfusing Refrigerant ········································································· 89
CHAPTER 3 COMMISSIONING OPERATION ························································ 92
1 SECURITY REQUIREMENTS ·········································································· 92
1.1 precautions for Construction················································································· 92
1.2 Precautions for the Use of Refrigerants ·································································· 92
1.3 Function Settings of ODUs ·················································································· 92
2 COMMISSIONING PROCESS ········································································· 115
2.1 Necessity of VRF Engineering Commissioning ······················································· 115
2.2 Required Files and Tools for Engineering Commissioning ········································· 116
2.3 Engineering Commissioning Procedures ······························································· 116
2.4 References for Proper Unit Operation Parameters ·················································· 139
CHAPTER 4 MAINTENANCE ··········································································· 141
1 SYSTEM FAILURE CODE TABLE ··································································· 141
2 EXCEPTION AND TROUBLESHOOTING ························································· 146
2.1 How to Locate a Faulty IDU Promptly ··································································· 146
2.2 Form Analyzing ······························································································· 147
2.3 System Faults ································································································· 155
3 MAINTENANCE OF KEY PARTS ···································································· 259
3.1 Cautions on ODU AP1 Replacement ···································································· 259
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