Daikin FDA125A5VEB - Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements

17 | Piping installation
Installer and user reference guide
59
FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
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............................................................................................ 60
17.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 61
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
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 piping.
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[47].
▪ 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:
Pipe outer diameter (mm)
Liquid pipe Gas pipe
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:
Outer diameter (Ø) Temper grade Thickness (t)
(a)
9.5mm (3/8") Annealed (O) ≥0.8mm
t
Ø
15.9mm (5/8") Annealed (O)
(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.