Daikin FXDA10A2VEB - 17 Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements

17 | Piping installation
Installer and user reference guide
57
FXDA10~63A2VEB
VRV system air conditioner
4P599621-1A – 2020.10
17 Piping installation
In this chapter
17.1 Preparing refrigerant piping ................................................................................................................................................... 57
17.1.1 Refrigerant piping requirements ........................................................................................................................... 57
17.1.2 Refrigerant piping insulation.................................................................................................................................. 58
17.2 Connecting the refrigerant piping.......................................................................................................................................... 58
17.2.1 About connecting the refrigerant piping............................................................................................................... 58
17.2.2 Precautions when connecting the refrigerant piping............................................................................................ 59
17.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 59
17.2.4 Pipe bending guidelines ......................................................................................................................................... 60
17.2.5 To flare the pipe end.............................................................................................................................................. 60
17.2.6 To connect the refrigerant piping to the indoor unit............................................................................................ 61
17.1 Preparing refrigerant piping
17.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[45].
CAUTION
Piping MUST be installed according to instructions given in "17 Piping
installation" [4 57]. 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 piping Gas piping
10~32 Ø6.4mm Ø9.5mm
40~63 Ø6.4mm Ø12.7mm
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness: