Daikin FTXTP25M5V1B, Installer'S Reference Manual

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7 | Piping installation
Installer reference guide
31
35M5V1B_35M5V1B
Daikin room air conditioner
4P519439-13N – 2021.03
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping ................................................................................................................................................... 31
7.1.1 Refrigerant piping requirements ........................................................................................................................... 31
7.1.2 Refrigerant piping insulation.................................................................................................................................. 32
7.2 Connecting the refrigerant piping.......................................................................................................................................... 32
7.2.1 About connecting the refrigerant piping............................................................................................................... 32
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 32
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 33
7.2.4 Pipe bending guidelines ......................................................................................................................................... 34
7.2.5 To flare the pipe end.............................................................................................................................................. 34
7.2.6 To connect the refrigerant piping to the indoor unit............................................................................................ 35
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions" [
4
7].
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.
▪ 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.