Daikin LRNUN5A7Y1, Installer And User Reference Manual, Page: 3 / 140

Table of contents
Installer and user reference guide
3
LRYELRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit
4P605460-1 – 2020.08
15 Unit installation 50
15.1 Preparing the installation site......................................................................................................................................... 50
15.1.1
Installation site requirements of the outdoor unit........................................................................................ 50
15.1.2 Additional installation site requirements of the outdoor unit in cold climates............................................ 53
15.1.3 Additional installation site requirements for CO₂ refrigerant ....................................................................... 53
15.2 Opening and closing the unit.......................................................................................................................................... 58
15.2.1
About opening the units................................................................................................................................. 58
15.2.2 To open the outdoor unit............................................................................................................................... 58
15.2.3 To open the electrical component box of the outdoor unit ......................................................................... 59
15.2.4 To close the outdoor unit............................................................................................................................... 60
15.3 Mounting the outdoor unit............................................................................................................................................. 61
15.3.1
About mounting the outdoor unit ................................................................................................................. 61
15.3.2 Precautions when mounting the outdoor unit .............................................................................................. 61
15.3.3 To provide the installation structure ............................................................................................................. 61
15.3.4 To install the outdoor unit on the installation structure............................................................................... 63
15.3.5 To provide drainage........................................................................................................................................ 63
16 Piping installation 64
16.1 Preparing refrigerant piping ........................................................................................................................................... 64
16.1.1
Refrigerant piping requirements.................................................................................................................... 64
16.1.2 Refrigerant piping material ............................................................................................................................ 65
16.1.3 Refrigerant piping length and height difference ........................................................................................... 65
16.1.4 To select the piping size ................................................................................................................................. 67
16.1.5 To select refrigerant branch kits .................................................................................................................... 69
16.1.6 To select expansion valves for refrigeration.................................................................................................. 70
16.2 Using stop valves and service ports................................................................................................................................ 71
16.2.1
Overview stop valves for refrigeration and air-conditioner .......................................................................... 71
16.2.2 Overview stop valves for maintenance.......................................................................................................... 71
16.2.3 To handle the stop valve ................................................................................................................................ 72
16.2.4 To handle the service port ............................................................................................................................. 74
16.2.5 Tightening torques ......................................................................................................................................... 75
16.3 Connecting the refrigerant piping .................................................................................................................................. 75
16.3.1
About connecting the refrigerant piping ....................................................................................................... 75
16.3.2 Precautions when connecting the refrigerant piping.................................................................................... 76
16.3.3 To remove the spun pipes.............................................................................................................................. 77
16.3.4 To connect the refrigerant piping to the outdoor unit ................................................................................. 78
16.3.5 To braze the pipe end..................................................................................................................................... 80
16.3.6 Guidelines to connect T-joints ....................................................................................................................... 81
16.3.7 Guidelines to install a dryer............................................................................................................................ 82
16.3.8 Guidelines to install safety valves .................................................................................................................. 83
16.3.9 Guidelines to install blow off piping............................................................................................................... 83
16.4 Checking the refrigerant piping...................................................................................................................................... 83
16.4.1
About checking the refrigerant piping ........................................................................................................... 84
16.4.2 Checking refrigerant piping: General guidelines ........................................................................................... 84
16.4.3 Checking refrigerant piping: Setup ................................................................................................................ 85
16.4.4 To perform a leak test .................................................................................................................................... 85
16.4.5 To perform vacuum drying............................................................................................................................. 86
16.5 Insulating the refrigerant piping..................................................................................................................................... 87
17 Electrical installation 88
17.1 About electrical compliance ........................................................................................................................................... 88
17.2 Field wiring: Overview .................................................................................................................................................... 89
17.3 Guidelines when knocking out knockout holes.............................................................................................................. 90
17.4 Guidelines when connecting the electrical wiring ......................................................................................................... 90
17.5 Specifications of standard wiring components .............................................................................................................. 92
17.6 Connections to the outdoor unit.................................................................................................................................... 93
17.6.1
Low voltage wiring – Outdoor unit ................................................................................................................ 93
17.6.2 High voltage wiring – Outdoor unit................................................................................................................ 95
17.7 Connections to the capacity up unit............................................................................................................................... 96
17.7.1
Low voltage wiring – Capacity up unit ........................................................................................................... 97
17.7.2 High voltage wiring – Capacity up unit .......................................................................................................... 99
18 Charging refrigerant 101
18.1 About charging refrigerant ............................................................................................................................................. 101
18.2 About the refrigerant...................................................................................................................................................... 101
18.3 Precautions when charging refrigerant.......................................................................................................................... 102
18.4 To determine additional refrigerant amount................................................................................................................. 104
18.5 To charge refrigerant ...................................................................................................................................................... 106
19 Finishing the outdoor unit installation 107