Daikin VRV 5-S - 18 Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements; Refrigerant Piping Material

18 | Piping installation
Installer and user reference guide
87
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
18 Piping installation
CAUTION
See "3 Specific installer safety instructions" [4 14] to make sure this installation
complies with all safety regulations.
In this chapter
18.1 Preparing refrigerant piping................................................................................................................................................... 87
18.1.1 Refrigerant piping requirements ........................................................................................................................... 87
18.1.2 Refrigerant piping material.................................................................................................................................... 87
18.1.3 Refrigerant piping insulation ................................................................................................................................. 88
18.1.4 To select the piping size......................................................................................................................................... 88
18.1.5 To select refrigerant branch kits............................................................................................................................ 90
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
18.1 Preparing refrigerant piping
18.1.1 Refrigerant piping requirements
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant piping.
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[48].
▪ Foreign materials inside pipes (including oils for fabrication) must be ≤30 mg/
10m.
18.1.2 Refrigerant piping material
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness: