Daikin VRV IV RDXYQ5T8V1B Series, Installer And User Manual

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16 | Piping installation
Installer and user reference guide
66
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
16 Piping installation
In this chapter
16.1 Preparing refrigerant piping ................................................................................................................................................... 66
16.1.1 Refrigerant piping requirements ........................................................................................................................... 66
16.1.2 Refrigerant piping material .................................................................................................................................... 67
16.1.3 To select the piping size ......................................................................................................................................... 67
16.1.4 To select refrigerant branch kits............................................................................................................................ 69
16.1.5 Refrigerant piping length and height difference ................................................................................................... 69
16.2 Connecting the refrigerant piping.......................................................................................................................................... 71
16.2.1 About connecting the refrigerant piping............................................................................................................... 71
16.2.2 Precautions when connecting the refrigerant piping............................................................................................ 71
16.2.3 Pipe bending guidelines ......................................................................................................................................... 72
16.2.4 To braze the pipe end ............................................................................................................................................ 72
16.2.5 Using the stop valve and service port.................................................................................................................... 72
16.2.6 To remove the pinched pipes ................................................................................................................................ 73
16.2.7 To connect the refrigerant piping to the compressor unit ................................................................................... 75
16.2.8 To connect the refrigerant piping to the heat exchanger unit ............................................................................. 76
16.2.9 To connect the refrigerant branching kit .............................................................................................................. 78
16.3 Checking the refrigerant piping.............................................................................................................................................. 78
16.3.1 About checking the refrigerant piping................................................................................................................... 78
16.3.2 Checking refrigerant piping: General guidelines ................................................................................................... 79
16.3.3 Checking refrigerant piping: Setup ........................................................................................................................ 79
16.3.4 To perform a leak test............................................................................................................................................ 80
16.3.5 To perform vacuum drying .................................................................................................................................... 81
16.3.6 To insulate the refrigerant piping .......................................................................................................................... 81
16.4 Charging refrigerant ............................................................................................................................................................... 82
16.4.1 About charging refrigerant .................................................................................................................................... 82
16.4.2 Precautions when charging refrigerant ................................................................................................................. 83
16.4.3 To determine the additional refrigerant amount.................................................................................................. 83
16.4.4 To charge refrigerant ............................................................................................................................................. 84
16.4.5 Error codes when charging refrigerant.................................................................................................................. 87
16.4.6 To fix the fluorinated greenhouse gases label....................................................................................................... 87
16.1 Preparing refrigerant piping
16.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions" [
4
9].
NOTICE
The refrigerant R410A requires strict cautions for keeping the system clean, dry and
tight.
▪
Clean and dry: foreign materials (including mineral oils or moisture) should be
prevented 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 pay
special attention to check the tightness of the installation.
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant.