Table of contents
Installer and user reference guide
4
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
18.1.6 Installation limitations ................................................................................................................................... 91
18.1.7 Refrigerant piping length and height difference........................................................................................... 92
18.2 Connecting the refrigerant piping.................................................................................................................................. 94
18.2.1 About connecting the refrigerant piping ...................................................................................................... 94
18.2.2 Precautions when connecting the refrigerant piping ................................................................................... 95
18.2.3 Pipe bending guidelines................................................................................................................................. 96
18.2.4 Using the stop valve and service port ........................................................................................................... 96
18.2.5 To remove the pinched pipes........................................................................................................................ 98
18.2.6 To braze the pipe end.................................................................................................................................... 99
18.2.7 To connect the refrigerant piping to the outdoor unit................................................................................. 99
18.2.8 To connect the refrigerant branching kit ...................................................................................................... 102
18.3 Checking the refrigerant piping ..................................................................................................................................... 102
18.3.1 About checking the refrigerant piping .......................................................................................................... 102
18.3.2 Checking refrigerant piping: General guidelines........................................................................................... 103
18.3.3 Checking refrigerant piping: Setup................................................................................................................ 104
18.3.4 To perform a leak test ................................................................................................................................... 104
18.3.5 To perform vacuum drying ............................................................................................................................ 105
18.3.6 To insulate the refrigerant piping.................................................................................................................. 106
18.3.7 To check for leaks after charging refrigerant................................................................................................ 107
19 Charging refrigerant 108
19.1 Precautions when charging refrigerant ......................................................................................................................... 108
19.2 About charging refrigerant............................................................................................................................................. 109
19.3 About the refrigerant ..................................................................................................................................................... 109
19.4 To determine the additional refrigerant amount.......................................................................................................... 110
19.5 To charge refrigerant ..................................................................................................................................................... 112
19.6 Error codes when charging refrigerant.......................................................................................................................... 114
19.7 To fix the fluorinated greenhouse gases label............................................................................................................... 114
19.8 To check refrigerant piping joints for leaks after charging refrigerant......................................................................... 115
20 Electrical installation 116
20.1 About connecting the electrical wiring.......................................................................................................................... 116
20.1.1 Precautions when connecting the electrical wiring...................................................................................... 116
20.1.2 About the electrical wiring ............................................................................................................................ 118
20.1.3 Guidelines for making knockout holes .......................................................................................................... 119
20.1.4 Guidelines when connecting the electrical wiring........................................................................................ 120
20.1.5 About electrical compliance .......................................................................................................................... 122
20.1.6 Specifications of standard wiring components............................................................................................. 123
20.2 To connect the electrical wiring to the outdoor unit .................................................................................................... 124
20.3 To connect the external outputs ................................................................................................................................... 126
20.4 To connect the cool/heat selector switch option.......................................................................................................... 127
20.5 To check the insulation resistance of the compressor.................................................................................................. 128
21 Configuration 129
21.1 Making field settings ...................................................................................................................................................... 129
21.1.1 About making field settings........................................................................................................................... 129
21.1.2 Field setting components .............................................................................................................................. 130
21.1.3 To access mode 1 or 2 ................................................................................................................................... 131
21.1.4 To use mode 1 ............................................................................................................................................... 132
21.1.5 To use mode 2 ............................................................................................................................................... 132
21.1.6 Mode 1: monitoring settings......................................................................................................................... 133
21.1.7 Mode 2: field settings .................................................................................................................................... 135
21.1.8 Indoor unit field setting ................................................................................................................................. 140
21.2 Energy saving and optimum operation.......................................................................................................................... 140
21.2.1 Available main operation methods ............................................................................................................... 140
21.2.2 Available comfort settings ............................................................................................................................. 142
21.2.3 Example: Automatic mode during cooling.................................................................................................... 143
21.2.4 Example: Automatic mode during heating ................................................................................................... 144
22 Commissioning 146
22.1 Overview: Commissioning.............................................................................................................................................. 146
22.2 Precautions when commissioning ................................................................................................................................. 146
22.3 Checklist before commissioning .................................................................................................................................... 147
22.4 Checklist during commissioning..................................................................................................................................... 148
22.5 About the SV unit test run.............................................................................................................................................. 149
22.6 About the system test run ............................................................................................................................................. 149
22.6.1 To perform a test run .................................................................................................................................... 149
22.6.2 Correcting after abnormal completion of the test run................................................................................. 150
22.7 To perform a SV/indoor unit connection check ............................................................................................................ 151
22.8 Operating the unit.......................................................................................................................................................... 153
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