Daikin FXMA50A5VEB, Installer And User Manual, Page: 59 / 88

17 | Piping installation
Installer and user reference guide
59
FXMA-A
VRV system air conditioner
4P680920-1 – 2022.01
17 Piping installation
In this chapter
17.1 Preparing refrigerant piping ................................................................................................................................................... 59
17.1.1 Refrigerant piping requirements ........................................................................................................................... 59
17.1.2 Refrigerant piping insulation.................................................................................................................................. 60
17.2 Connecting the refrigerant piping.......................................................................................................................................... 60
17.2.1 About connecting the refrigerant piping............................................................................................................... 60
17.2.2 Precautions when connecting the refrigerant piping............................................................................................ 61
17.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 62
17.2.4 Pipe bending guidelines ......................................................................................................................................... 62
17.2.5 To flare the pipe end.............................................................................................................................................. 62
17.2.6 To connect the refrigerant piping to the indoor unit............................................................................................ 63
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
59]. 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
50~80 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: