Daikin FXFA20A2VEB - 17 Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements

17 | Piping installation
Installer and user reference guide
61
FXFA20~125A2VEB
VRV system air conditioner
4P599624-1A – 2020.06
17 Piping installation
In this chapter
17.1 Preparing refrigerant piping ................................................................................................................................................... 61
17.1.1 Refrigerant piping requirements ........................................................................................................................... 61
17.1.2 Refrigerant piping insulation.................................................................................................................................. 62
17.2 Connecting the refrigerant piping.......................................................................................................................................... 62
17.2.1 About connecting the refrigerant piping............................................................................................................... 62
17.2.2 Precautions when connecting the refrigerant piping............................................................................................ 63
17.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 63
17.2.4 Pipe bending guidelines ......................................................................................................................................... 64
17.2.5 To flare the pipe end.............................................................................................................................................. 64
17.2.6 To connect the refrigerant piping to the indoor unit............................................................................................ 65
17.1 Preparing refrigerant piping
17.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "General safety precautions"
chapter.
CAUTION
Piping MUST be installed according to instructions given in "17 Piping
installation" [4 61]. Only mechanical joints (e.g. braze+flare connections) that are
compliant with the latest version of ISO14903 can be used.
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
For piping connections of the indoor unit use the following piping diameters:
Class Pipe outer diameter (mm)
Liquid pipe Gas pipe
20~32 Ø6.4 Ø9.5
40~80 Ø6.4 Ø12.7
100~125 Ø9.5 Ø15.9
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness: