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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
18.1.2 Refrigerant piping material
Installer and user reference guide
80
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 outdoor units and standard multi-outdoor-unit combinations >20 HP.....................................................
18.1.9
Standard multi-outdoor-unit combinations ≤20 HP and free multi-outdoor-unit combinations........................
18.1.10 Multiple outdoor units: Possible layouts...............................................................................................................
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
Multiple outdoor units: Knockout holes................................................................................................................
18.2.4
To route the refrigerant piping ..............................................................................................................................
18.2.5
To connect the refrigerant piping to the outdoor unit .........................................................................................
18.2.6
To connect the multi connection piping kit...........................................................................................................
18.2.7
To connect the refrigerant branching kit ..............................................................................................................
18.2.8
To protect against contamination .........................................................................................................................
18.2.9
To braze the pipe end ............................................................................................................................................
18.2.10 Using the stop valve and service port....................................................................................................................
18.2.11 To remove the pinched pipes ................................................................................................................................
18.3
Checking the refrigerant piping..............................................................................................................................................
18.3.1
About checking the refrigerant piping...................................................................................................................
18.3.2
Checking refrigerant piping: General guidelines ................................................................................................... 100
18.3.3
Checking refrigerant piping: Setup ........................................................................................................................ 101
18.3.4
To perform a leak test............................................................................................................................................ 101
18.3.5
To perform vacuum drying .................................................................................................................................... 102
18.3.6
To insulate the refrigerant piping .......................................................................................................................... 103
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
▪
Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
▪
Piping material: phosphoric acid deoxidised seamless copper
instructions" [
8].
4
13] to make sure this installation
"2 General safety
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 - 2022.07
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