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18
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Piping installation
18 Piping installation
In this chapter
18.1 Preparing refrigerant piping
18.1.1 Refrigerant piping requirements
Installer and user reference guide
90
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
About the piping length .........................................................................................................................................
18.1.8
Single and multi-outdoor-unit combinations ........................................................................................................
18.1.9
Multiple outdoor units: Possible layouts............................................................................................................... 100
18.2
Connecting the refrigerant piping.......................................................................................................................................... 102
18.2.1
About connecting the refrigerant piping............................................................................................................... 102
18.2.2
Precautions when connecting the refrigerant piping............................................................................................ 102
18.2.3
Multiple outdoor units: Knockout holes................................................................................................................ 103
18.2.4
Using the stop valve and service port.................................................................................................................... 103
18.2.5
To route the refrigerant piping .............................................................................................................................. 105
18.2.6
To protect against contamination ......................................................................................................................... 106
18.2.7
To remove the pinched pipes ................................................................................................................................ 107
18.2.8
To braze the pipe end ............................................................................................................................................ 108
18.2.9
To connect the refrigerant piping to the outdoor unit ......................................................................................... 108
18.2.10 To connect the multi connection piping kit........................................................................................................... 109
18.2.11 To connect the refrigerant branching kit .............................................................................................................. 110
18.3
Checking the refrigerant piping.............................................................................................................................................. 110
18.3.1
About checking the refrigerant piping................................................................................................................... 110
18.3.2
Checking refrigerant piping: General guidelines ................................................................................................... 111
18.3.3
Checking refrigerant piping: Setup ........................................................................................................................ 112
18.3.4
To perform a leak test............................................................................................................................................ 112
18.3.5
To perform vacuum drying .................................................................................................................................... 113
18.3.6
To insulate the refrigerant piping .......................................................................................................................... 114
18.3.7
To check for leaks after charging refrigerant ........................................................................................................ 115
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
precautions" [
4
INFORMATION
The RXYA/RMYA unit will limit pressure on the field piping to 37.3 bar. Inside the
outdoor unit, design pressure is 40 bar.
▪
Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
instructions" [
8].
4
14] to make sure this installation
"2 General safety
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 - 2023.12
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