Daikin LREN8A7Y1B - Page 3

Table of contents
Installer and user reference guide
3
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
14.1.2 Additional installation site requirements of the outdoor unit in cold climates............................................ 60
14.1.3 Additional installation site requirements for CO₂ refrigerant ....................................................................... 60
14.2 Opening and closing the unit.......................................................................................................................................... 65
14.2.1 About opening the units................................................................................................................................. 65
14.2.2 To open the outdoor unit............................................................................................................................... 65
14.2.3 To open the electrical component box of the outdoor unit ......................................................................... 66
14.2.4 To close the outdoor unit............................................................................................................................... 67
14.3 Mounting the outdoor unit............................................................................................................................................. 68
14.3.1 About mounting the outdoor unit ................................................................................................................. 68
14.3.2 Precautions when mounting the outdoor unit.............................................................................................. 68
14.3.3 To provide the installation structure ............................................................................................................. 68
14.3.4 To install the outdoor unit ............................................................................................................................. 70
14.3.5 To remove the transportation stay................................................................................................................ 70
14.3.6 To provide drainage........................................................................................................................................ 71
15 Piping installation 72
15.1 Preparing refrigerant piping ........................................................................................................................................... 72
15.1.1 Refrigerant piping requirements.................................................................................................................... 72
15.1.2 Refrigerant piping material ............................................................................................................................ 73
15.1.3 Refrigerant piping length and height difference ........................................................................................... 73
15.1.4 To select the piping size ................................................................................................................................. 75
15.1.5 To select refrigerant branch kits .................................................................................................................... 77
15.1.6 To select expansion valves for refrigeration.................................................................................................. 77
15.2 Using stop valves and service ports................................................................................................................................ 78
15.2.1 Overview stop valves and service ports for connection and charging.......................................................... 79
15.2.2 Overview stop valves for maintenance.......................................................................................................... 79
15.2.3 To handle the stop valve ................................................................................................................................ 80
15.2.4 Tightening torques ......................................................................................................................................... 81
15.2.5 To handle the service port ............................................................................................................................. 81
15.3 Connecting the refrigerant piping .................................................................................................................................. 83
15.3.1 About connecting the refrigerant piping ....................................................................................................... 83
15.3.2 Precautions when connecting the refrigerant piping.................................................................................... 84
15.3.3 To cut off the spun pipe ends ........................................................................................................................ 85
15.3.4 To connect the refrigerant piping to the outdoor unit ................................................................................. 86
15.3.5 To braze the pipe end..................................................................................................................................... 89
15.3.6 Guidelines to connect T-joints ....................................................................................................................... 91
15.3.7 Guidelines to install a dryer............................................................................................................................ 92
15.3.8 Guidelines to install a filter............................................................................................................................. 92
15.3.9 About safety valves......................................................................................................................................... 93
15.3.10 Guidelines to install blow-off piping .............................................................................................................. 96
15.4 Checking the refrigerant piping ...................................................................................................................................... 96
15.4.1 About checking the refrigerant piping........................................................................................................... 97
15.4.2 Checking refrigerant piping: General guidelines ........................................................................................... 97
15.4.3 Checking refrigerant piping: Setup ................................................................................................................ 97
15.4.4 To perform a strength pressure test and leak test........................................................................................ 98
15.4.5 To perform vacuum drying............................................................................................................................. 98
15.5 Insulating the refrigerant piping..................................................................................................................................... 99
15.5.1 To insulate the gas stop valve ........................................................................................................................ 99
16 Electrical installation 101
16.1 About connecting the electrical wiring .......................................................................................................................... 101
16.1.1 Precautions when connecting the electrical wiring....................................................................................... 101
16.1.2 Guidelines when connecting the electrical wiring......................................................................................... 102
16.1.3 About electrical compliance........................................................................................................................... 104
16.2 Field wiring: Overview .................................................................................................................................................... 105
16.3 Guidelines when knocking out knockout holes.............................................................................................................. 106
16.4 Specifications of standard wiring components .............................................................................................................. 107
16.5 Connections to the outdoor unit.................................................................................................................................... 108
16.5.1 Low voltage wiring – Outdoor unit ................................................................................................................ 108
16.5.2 High voltage wiring – Outdoor unit................................................................................................................ 110
16.6 Connections to the capacity up unit............................................................................................................................... 112
16.6.1 Low voltage wiring – Capacity up unit ........................................................................................................... 112
16.6.2 High voltage wiring – Capacity up unit .......................................................................................................... 114
17 Charging refrigerant 116
17.1 About charging refrigerant ............................................................................................................................................. 116
17.2 Precautions when charging refrigerant.......................................................................................................................... 116
17.3 About the refrigerant...................................................................................................................................................... 117
17.4 To determine the refrigerant amount............................................................................................................................ 119
17.5 To charge refrigerant ...................................................................................................................................................... 120