Daikin VRV 5 RXYA8A7Y1B, Инструкция по установке и эксплуатации

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18 | Piping installation
Installer and user reference guide
90
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
18 Piping installation
CAUTION
See "3 Specific installer safety instructions" [
4
14] to make sure this installation
complies with all safety regulations.
In this chapter
18.1 Preparing refrigerant piping ................................................................................................................................................... 90
18.1.1 Refrigerant piping requirements ........................................................................................................................... 90
18.1.2 Refrigerant piping material .................................................................................................................................... 91
18.1.3 Refrigerant piping insulation.................................................................................................................................. 91
18.1.4 To select the piping size ......................................................................................................................................... 91
18.1.5 To select refrigerant branch kits............................................................................................................................ 93
18.1.6 Installation limitations............................................................................................................................................ 94
18.1.7 About the piping length ......................................................................................................................................... 96
18.1.8 Single and multi-outdoor-unit combinations ........................................................................................................ 98
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
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].
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.