Daikin VRV IV Q+ Series Installer And User Reference Manual

Also see for RXYQQ10U7Y1B: Installation and operation manual

18 | Piping installationInstaller and user reference guide70RXYQQ8~20U7Y1BVRV IV Q+ series heat pump4P546229-1A – 2020.1018 Piping installationIn this chapter18.1 Preparing refrigerant piping ................................................................................................................................................... 7018.1.1 Refrigerant piping requirements ........................................................................................................................... 7018.1.2 Refrigerant piping insulation.................................................................................................................................. 7118.1.3 To select the piping size ......................................................................................................................................... 7218.1.4 To select refrigerant branch kits............................................................................................................................ 7418.1.5 About the piping length ......................................................................................................................................... 7518.1.6 Piping length: VRV DX only..................................................................................................................................... 7618.1.7 Multiple outdoor units: Possible layouts............................................................................................................... 7918.2 Connecting the refrigerant piping.......................................................................................................................................... 8018.2.1 About connecting the refrigerant piping............................................................................................................... 8018.2.2 Precautions when connecting the refrigerant piping............................................................................................ 8118.2.3 Multiple outdoor units: Knockout holes................................................................................................................ 8118.2.4 To route the refrigerant piping .............................................................................................................................. 8218.2.5 To connect the refrigerant piping to the outdoor unit ......................................................................................... 8218.2.6 To connect the multi connection piping kit........................................................................................................... 8318.2.7 To connect the refrigerant branching kit .............................................................................................................. 8318.2.8 To protect against contamination ......................................................................................................................... 8418.2.9 To braze the pipe end ............................................................................................................................................ 8518.2.10 Using the stop valve and service port.................................................................................................................... 8518.2.11 To remove the spun pipes ..................................................................................................................................... 8818.3 Checking the refrigerant piping.............................................................................................................................................. 8918.3.1 About checking the refrigerant piping................................................................................................................... 8918.3.2 Checking refrigerant piping: General guidelines ................................................................................................... 9018.3.3 Checking refrigerant piping: Setup ........................................................................................................................ 9118.3.4 To perform a leak test............................................................................................................................................ 9118.3.5 To perform vacuum drying .................................................................................................................................... 9218.3.6 To insulate the refrigerant piping .......................................................................................................................... 9318.4 Charging refrigerant ............................................................................................................................................................... 9318.4.1 Precautions when charging refrigerant ................................................................................................................. 9318.4.2 About charging refrigerant .................................................................................................................................... 9418.4.3 To determine the additional refrigerant amount.................................................................................................. 9518.4.4 To charge refrigerant: Flow chart .......................................................................................................................... 9818.4.5 To charge refrigerant ............................................................................................................................................. 9918.4.6 Step 6a: To automatically charge refrigerant........................................................................................................ 10118.4.7 Step 6b: To manually charge refrigerant ............................................................................................................... 10318.4.8 Error codes when charging refrigerant.................................................................................................................. 10418.4.9 Checks after charging refrigerant .......................................................................................................................... 10418.4.10 To fix the fluorinated greenhouse gases label....................................................................................................... 10418.1 Preparing refrigerant piping18.1.1 Refrigerant piping requirementsNOTICEThe refrigerant R410A requires strict cautions for keeping the system clean, dry andtight.▪ Clean and dry: foreign materials (including mineral oils or moisture) should beprevented from getting mixed into the system.▪ Tight: R410A does not contain any chlorine, does not destroy the ozone layer,and does not reduce earth's protection against harmful ultraviolet radiation.R410A can contribute to the greenhouse effect if it is released. Therefore payspecial attention to check the tightness of the installation.