Daikin VRV 5-S Series - 18 Piping Installation; 18.1 Preparing Refrigerant Piping; 18.1.1 Piping Requirements; 18.1.2 Piping Material Specifications

18 | Piping installation
Installer and user reference guide
77
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1 – 2020.01
18 Piping installation
In this chapter
18.1 Preparing refrigerant piping ................................................................................................................................................... 77
18.1.1 Refrigerant piping requirements ........................................................................................................................... 77
18.1.2 Refrigerant piping material .................................................................................................................................... 77
18.1.3 To select the piping size......................................................................................................................................... 78
18.1.4 To select refrigerant branch kits............................................................................................................................ 79
18.1.5 Refrigerant piping length and height difference ................................................................................................... 80
18.2 Connecting the refrigerant piping.......................................................................................................................................... 81
18.2.1 About connecting the refrigerant piping............................................................................................................... 81
18.2.2 Precautions when connecting the refrigerant piping............................................................................................ 81
18.2.3 Pipe bending guidelines ......................................................................................................................................... 82
18.2.4 To braze the pipe end ............................................................................................................................................ 82
18.2.5 Using the stop valve and service port.................................................................................................................... 83
18.2.6 To remove the spun pipes ..................................................................................................................................... 84
18.2.7 To connect the refrigerant piping to the outdoor unit ......................................................................................... 85
18.2.8 To connect the refrigerant branching kit .............................................................................................................. 87
18.3 Checking the refrigerant piping.............................................................................................................................................. 88
18.3.1 About checking the refrigerant piping................................................................................................................... 88
18.3.2 Checking refrigerant piping: General guidelines ................................................................................................... 89
18.3.3 Checking refrigerant piping: Setup ........................................................................................................................ 89
18.3.4 To perform a leak test............................................................................................................................................ 90
18.3.5 To perform vacuum drying .................................................................................................................................... 90
18.1 Preparing refrigerant piping
18.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "General safety precautions"
chapter.
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant.
▪ 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