Daikin VRV 5 REYA8A7Y1B, Installer And User Manual, Page: 80 / 180

18 | Piping installation
Installer and user reference guide
80
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
18 Piping installation
CAUTION
See "3 Specific installer safety instructions" [
4
13] to make sure this installation
complies with all safety regulations.
In this chapter
18.1 Preparing refrigerant piping ................................................................................................................................................... 80
18.1.1 Refrigerant piping requirements ........................................................................................................................... 80
18.1.2 Refrigerant piping material .................................................................................................................................... 80
18.1.3 Refrigerant piping insulation.................................................................................................................................. 81
18.1.4 To select the piping size ......................................................................................................................................... 81
18.1.5 To select refrigerant branch kits............................................................................................................................ 83
18.1.6 Installation limitations............................................................................................................................................ 84
18.1.7 About the piping length ......................................................................................................................................... 85
18.1.8 Single outdoor units and standard multi-outdoor-unit combinations >20 HP..................................................... 87
18.1.9 Standard multi-outdoor-unit combinations ≤20 HP and free multi-outdoor-unit combinations........................ 88
18.1.10 Multiple outdoor units: Possible layouts............................................................................................................... 89
18.2 Connecting the refrigerant piping.......................................................................................................................................... 91
18.2.1 About connecting the refrigerant piping............................................................................................................... 91
18.2.2 Precautions when connecting the refrigerant piping............................................................................................ 91
18.2.3 Multiple outdoor units: Knockout holes................................................................................................................ 92
18.2.4 To route the refrigerant piping .............................................................................................................................. 92
18.2.5 To connect the refrigerant piping to the outdoor unit ......................................................................................... 93
18.2.6 To connect the multi connection piping kit........................................................................................................... 94
18.2.7 To connect the refrigerant branching kit .............................................................................................................. 94
18.2.8 To protect against contamination ......................................................................................................................... 95
18.2.9 To braze the pipe end ............................................................................................................................................ 96
18.2.10 Using the stop valve and service port.................................................................................................................... 96
18.2.11 To remove the pinched pipes ................................................................................................................................ 98
18.3 Checking the refrigerant piping.............................................................................................................................................. 99
18.3.1 About checking the refrigerant piping................................................................................................................... 99
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
18.1 Preparing refrigerant piping
18.1.1 Refrigerant piping requirements
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 "2 General safety
precautions" [
4
8].
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
18.1.2 Refrigerant piping material
▪ Piping material: phosphoric acid deoxidised seamless copper