Daikin VRV 5-S Series - 18.2 Connecting Refrigerant Piping; 18.2.1 Connecting Piping Overview; 18.2.2 Precautions for Connecting Piping

18 | Piping installation
Installer and user reference guide
81
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02
18 Piping installation
In this chapter
18.1 Preparing refrigerant piping ................................................................................................................................................... 81
18.1.1 Refrigerant piping requirements ........................................................................................................................... 81
18.1.2 Refrigerant piping material .................................................................................................................................... 81
18.1.3 To select the piping size ......................................................................................................................................... 82
18.1.4 To select refrigerant branch kits ............................................................................................................................ 83
18.1.5 Refrigerant piping length and height difference ................................................................................................... 84
18.2 Connecting the refrigerant piping.......................................................................................................................................... 85
18.2.1 About connecting the refrigerant piping ............................................................................................................... 85
18.2.2 Precautions when connecting the refrigerant piping............................................................................................ 85
18.2.3 Pipe bending guidelines ......................................................................................................................................... 86
18.2.4 To remove the spun pipes ..................................................................................................................................... 86
18.2.5 To braze the pipe end ............................................................................................................................................ 87
18.2.6 Using the stop valve and service port.................................................................................................................... 88
18.2.7 To connect the refrigerant piping to the outdoor unit ......................................................................................... 89
18.2.8 To connect the refrigerant branching kit .............................................................................................................. 91
18.3 Checking the refrigerant piping.............................................................................................................................................. 92
18.3.1 About checking the refrigerant piping................................................................................................................... 92
18.3.2 Checking refrigerant piping: General guidelines ................................................................................................... 93
18.3.3 Checking refrigerant piping: Setup ........................................................................................................................ 93
18.3.4 To perform a leak test ............................................................................................................................................ 94
18.3.5 To perform vacuum drying .................................................................................................................................... 95
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:
Outer diameter (Ø) Temper grade Thickness (t)
(a)
6.4mm (1/4")
9.5mm (3/8")
12.7mm (1/2")
Annealed (O) ≥0.80mm
t
Ø
15.9mm (5/8") Annealed (O) ≥0.99mm
19.1mm (3/4") Half hard (1/2H) ≥0.80mm