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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
15.1
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
16.1
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
17.1
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
Table of contents
72
101
116
Installer and user reference guide
3
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Troubleshooting
