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18 Piping installation
In this chapter
18.1 Preparing refrigerant piping
18.1.1 Refrigerant piping requirements
18.1.2 Refrigerant piping material
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A - 2024.02
CAUTION
See
"3 Specific installer safety
complies with all safety regulations.
18.1
Preparing refrigerant piping ...................................................................................................................................................
18.1.1
Refrigerant piping requirements ...........................................................................................................................
18.1.2
Refrigerant piping material....................................................................................................................................
18.1.3
Refrigerant piping insulation .................................................................................................................................
18.1.4
To select the piping size.........................................................................................................................................
18.1.5
To select refrigerant branch kits............................................................................................................................
18.1.6
Installation limitations............................................................................................................................................
18.1.7
Refrigerant piping length and height difference...................................................................................................
18.2
Connecting the refrigerant piping..........................................................................................................................................
18.2.1
About connecting the refrigerant piping...............................................................................................................
18.2.2
Precautions when connecting the refrigerant piping ...........................................................................................
18.2.3
Pipe bending guidelines .........................................................................................................................................
18.2.4
Using the stop valve and service port....................................................................................................................
18.2.5
To remove the pinched pipes ................................................................................................................................
18.2.6
To braze the pipe end ............................................................................................................................................
18.2.7
To connect the refrigerant piping to the outdoor unit .........................................................................................
18.2.8
To connect the refrigerant branching kit .............................................................................................................. 102
18.3
Checking the refrigerant piping.............................................................................................................................................. 102
18.3.1
About checking the refrigerant piping................................................................................................................... 102
18.3.2
Checking refrigerant piping: General guidelines ................................................................................................... 103
18.3.3
Checking refrigerant piping: Setup ........................................................................................................................ 104
18.3.4
To perform a leak test............................................................................................................................................ 104
18.3.5
To perform vacuum drying .................................................................................................................................... 105
18.3.6
To insulate the refrigerant piping.......................................................................................................................... 106
18.3.7
To check for leaks after charging refrigerant ........................................................................................................ 107
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
4
precautions" [
▪
Foreign materials inside pipes (including oils for fabrication) must be ≤30 mg/
10 m.
▪
Piping material: phosphoric acid deoxidised seamless copper
▪
Flare connections: Only use annealed material.
▪
Piping temper grade and thickness:
instructions" [
8].
18
Piping installation
|
4
14] to make sure this installation
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Installer and user reference guide
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