7
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Piping installation
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
Refrigerant piping diameter
Refrigerant piping material
Installer reference guide
32
7.1
Preparing refrigerant piping ...................................................................................................................................................
7.1.1
Refrigerant piping requirements ...........................................................................................................................
7.1.2
Refrigerant piping insulation..................................................................................................................................
7.1.3
7.2
Connecting the refrigerant piping..........................................................................................................................................
7.2.1
7.2.2
7.2.3
7.2.4
Pipe bending guidelines .........................................................................................................................................
7.2.5
To flare the pipe end..............................................................................................................................................
7.2.6
7.2.7
7.3
Checking the refrigerant piping..............................................................................................................................................
7.3.1
7.3.2
7.3.3
To check for leaks...................................................................................................................................................
7.3.4
To perform vacuum drying ....................................................................................................................................
INFORMATION
Also read the precautions and requirements in the
4
precautions" [
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.
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.
Liquid piping
Ø6.4 mm
▪
Piping material: Phosphoric acid deoxidised seamless copper.
▪
Flare connections: Only use annealed material.
▪
Piping temper grade and thickness:
Outer diameter (Ø)
6.4 mm (1/4")
9.5 mm (3/8")
7].
Temper grade
Annealed (O)
≥0.8 mm
Annealed (O)
"2 General safety
Gas piping
Ø9.5 mm
(a)
Thickness (t)
RXTM-R_RXTP-R_ARXTP-R_RXTA-B
4P518023-11H - 2021.03
32
32
33
33
33
33
34
35
36
36
36
38
38
38
39
39
40
Ø
t
R32 split series