8 | Piping installation
Installer reference guide
90
ERLA11~16D + EBBH/X11+16D
Daikin Altherma 3 R W
4P643603-1B – 2022.05
8 Piping installation
In this chapter
8.1 Preparing refrigerant piping................................................................................................................................................... 90
8.1.1 Refrigerant piping requirements ........................................................................................................................... 90
8.1.2 Refrigerant piping insulation.................................................................................................................................. 91
8.2 Connecting the refrigerant piping.......................................................................................................................................... 91
8.2.1 About connecting the refrigerant piping............................................................................................................... 91
8.2.2 Precautions when connecting the refrigerant piping............................................................................................ 92
8.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 93
8.2.4 Pipe bending guidelines ......................................................................................................................................... 93
8.2.5 To flare the pipe end.............................................................................................................................................. 93
8.2.6 To braze the pipe end ............................................................................................................................................ 94
8.2.7 Using the stop valve and service port.................................................................................................................... 95
8.2.8 To connect the refrigerant piping to the outdoor unit ......................................................................................... 96
8.2.9 To connect the refrigerant piping to the indoor unit............................................................................................ 99
8.3 Checking the refrigerant piping.............................................................................................................................................. 99
8.3.1 About checking the refrigerant piping................................................................................................................... 99
8.3.2 Precautions when checking the refrigerant piping ............................................................................................... 100
8.3.3 Checking refrigerant piping: Setup ........................................................................................................................ 100
8.3.4 To check for leaks................................................................................................................................................... 100
8.3.5 To perform vacuum drying .................................................................................................................................... 101
8.4 Charging refrigerant ............................................................................................................................................................... 102
8.4.1 About charging refrigerant .................................................................................................................................... 102
8.4.2 Precautions when charging refrigerant ................................................................................................................. 103
8.4.3 Charging additional refrigerant.............................................................................................................................. 104
8.4.4 Completely recharging refrigerant ........................................................................................................................ 104
8.4.5 To fix the fluorinated greenhouse gases label....................................................................................................... 105
8.5 Preparing water piping ........................................................................................................................................................... 106
8.5.1 Water circuit requirements ................................................................................................................................... 106
8.5.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 109
8.5.3 To check the water volume and flow rate............................................................................................................. 109
8.5.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 111
8.5.5 To check the water volume: Examples .................................................................................................................. 112
8.6 Connecting water piping ........................................................................................................................................................ 112
8.6.1 About connecting the water piping ....................................................................................................................... 112
8.6.2 Precautions when connecting the water piping.................................................................................................... 113
8.6.3 To connect the water piping.................................................................................................................................. 113
8.6.4 To fill the water circuit ........................................................................................................................................... 114
8.6.5 To fill the domestic hot water tank........................................................................................................................ 115
8.6.6 To insulate the water piping .................................................................................................................................. 115
8.1 Preparing refrigerant piping
8.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[410].
Also see "7.1.4 Special requirements for R32 units" [4 70] for additional
requirements.
▪ Piping length: See "7.1.3Installation site requirements of the indoor unit"[469].
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ Piping connections: Only flare and brazed connections are allowed. The indoor
and outdoor units have flare connections. Connect both ends without brazing. If
brazing should be needed, take the guidelines in the installer reference guide
into account.
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