Daikin FTXP35N5V1B - Piping Installation; Refrigerant Piping Requirements; Refrigerant Piping Material and Grade

7 | Piping installation
Installer reference guide
33
FTXP20~35N5V1B + ATXP20~35N5V1B
Split system air conditioners
4P519439-20U – 2022.09
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping................................................................................................................................................... 33
7.1.1 Refrigerant piping requirements ........................................................................................................................... 33
7.1.2 Refrigerant piping insulation.................................................................................................................................. 34
7.2 Connecting the refrigerant piping.......................................................................................................................................... 34
7.2.1 About connecting the refrigerant piping............................................................................................................... 34
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 34
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 35
7.2.4 Pipe bending guidelines ......................................................................................................................................... 36
7.2.5 To flare the pipe end.............................................................................................................................................. 36
7.2.6 To connect the refrigerant piping to the indoor unit............................................................................................ 37
7.1 Preparing refrigerant piping
7.1.1 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5].
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30mg/10m.
Refrigerant piping diameter
Use the same diameters as the connections on the outdoor units:
Pipe outer diameter (mm)
Liquid piping Gas piping
Ø6.4 Ø9.5
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") Annealed (O) ≥0.8mm
t
Ø
(a)
Depending on the applicable legislation and the maximum working pressure of the unit
(see "PS High" on the unit name plate), larger piping thickness might be required.