Daikin FTXF-C - 7 Piping Installation; 7.1 Refrigerant Piping Requirements

7 | Piping installation
Installer reference guide
33
FTXF20~42C5V1B + ATXF20~42C5V1B
Daikin room air conditioner
4P519439-9J – 2021.06
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
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[46].
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.
Refrigerant piping diameter
Use the same diameters as the connections on the outdoor units:
Class L1 liquid piping L1 gas piping
20~42 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
9.5mm (3/8")
12.7mm (1/2")
(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.