8 | Piping installation
Installer reference guide
75
ERGA04~08EAV3(A) + EHVH04+08SU18+23EA6V
Daikin Altherma 3 R F
4P629090-1 – 2020.08
8 Piping installation
In this chapter
8.1 Preparing refrigerant piping................................................................................................................................................... 75
8.1.1 Refrigerant piping requirements ........................................................................................................................... 75
8.1.2 Refrigerant piping insulation.................................................................................................................................. 76
8.2 Preparing water piping ........................................................................................................................................................... 76
8.2.1 Water circuit requirements ................................................................................................................................... 76
8.2.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 80
8.2.3 To check the water volume and flow rate............................................................................................................. 80
8.2.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 82
8.2.5 To check the water volume: Examples .................................................................................................................. 83
8.3 Connecting the refrigerant piping.......................................................................................................................................... 84
8.3.1 About connecting the refrigerant piping............................................................................................................... 84
8.3.2 Precautions when connecting the refrigerant piping............................................................................................ 84
8.3.3 Guidelines when connecting the refrigerant piping.............................................................................................. 85
8.3.4 Pipe bending guidelines ......................................................................................................................................... 86
8.3.5 To flare the pipe end.............................................................................................................................................. 86
8.3.6 To braze the pipe end ............................................................................................................................................ 87
8.3.7 Using the stop valve and service port.................................................................................................................... 87
8.3.8 To connect the refrigerant piping to the outdoor unit ......................................................................................... 89
8.3.9 To connect the refrigerant piping to the indoor unit............................................................................................ 89
8.4 Checking the refrigerant piping.............................................................................................................................................. 90
8.4.1 About checking the refrigerant piping................................................................................................................... 90
8.4.2 Precautions when checking the refrigerant piping ............................................................................................... 90
8.4.3 To check for leaks................................................................................................................................................... 91
8.4.4 To perform vacuum drying .................................................................................................................................... 91
8.4.5 To insulate the refrigerant piping .......................................................................................................................... 92
8.5 Charging refrigerant ............................................................................................................................................................... 93
8.5.1 About charging refrigerant .................................................................................................................................... 93
8.5.2 Precautions when charging refrigerant ................................................................................................................. 94
8.5.3 To determine the additional refrigerant amount.................................................................................................. 94
8.5.4 To determine the complete recharge amount...................................................................................................... 94
8.5.5 To charge additional refrigerant............................................................................................................................ 94
8.5.6 To fix the fluorinated greenhouse gases label....................................................................................................... 95
8.6 Connecting water piping ........................................................................................................................................................ 95
8.6.1 About connecting the water piping ....................................................................................................................... 95
8.6.2 Precautions when connecting the water piping.................................................................................................... 96
8.6.3 To connect the water piping.................................................................................................................................. 96
8.6.4 To connect the water piping for domestic hot water ........................................................................................... 98
8.6.5 To connect the recirculation piping....................................................................................................................... 101
8.6.6 To fill the water circuit ........................................................................................................................................... 101
8.6.7 To fill the domestic hot water tank........................................................................................................................ 101
8.6.8 To insulate the water piping .................................................................................................................................. 102
8.1 Preparing refrigerant piping
8.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[49].
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping diameter:
Liquid piping Ø6.4mm (1/4")
Gas piping Ø15.9mm (5/8")
▪ Piping temper grade and thickness:
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