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

7 | Piping installation
Installer reference guide
30
FTXTP-M_FTXTP-N
Daikin room air conditioner
4P728168-4 – 2023.03
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping................................................................................................................................................... 30
7.1.1 Refrigerant piping requirements ........................................................................................................................... 30
7.1.2 Refrigerant piping insulation.................................................................................................................................. 31
7.2 Connecting the refrigerant piping.......................................................................................................................................... 31
7.2.1 About connecting the refrigerant piping............................................................................................................... 31
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 31
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 32
7.2.4 Pipe bending guidelines ......................................................................................................................................... 33
7.2.5 To flare the pipe end.............................................................................................................................................. 33
7.2.6 To connect the refrigerant piping to the indoor unit............................................................................................ 34
7.2.7 To check refrigerant piping joints for leaks after charging refrigerant................................................................. 34
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
CAUTION
Piping and joints of a split system shall be made with permanent joints when inside
an occupied space except joints directly connecting the piping to the indoor units.
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
Use the same diameters as the connections on the outdoor units:
Liquid piping Gas piping
Ø6.4mm Ø9.5mm
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") 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.