8 | Piping installation
Installer reference guide
85
ERGA04~08EA + EHVH04+08SU18+23EA
Daikin Altherma 3 R F
4P629090-1A – 2021.11
8 Piping installation
INFORMATION
This unit is a heating only model. Therefore, all references to cooling in this
document are NOT applicable.
In this chapter
8.1 Preparing refrigerant piping................................................................................................................................................... 85
8.1.1 Refrigerant piping requirements ........................................................................................................................... 85
8.1.2 Refrigerant piping insulation.................................................................................................................................. 86
8.2 Connecting the refrigerant piping.......................................................................................................................................... 86
8.2.1 About connecting the refrigerant piping............................................................................................................... 86
8.2.2 Precautions when connecting the refrigerant piping............................................................................................ 87
8.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 88
8.2.4 Pipe bending guidelines ......................................................................................................................................... 88
8.2.5 To flare the pipe end.............................................................................................................................................. 88
8.2.6 To braze the pipe end ............................................................................................................................................ 89
8.2.7 Using the stop valve and service port.................................................................................................................... 90
8.2.8 To connect the refrigerant piping to the outdoor unit ......................................................................................... 91
8.2.9 To connect the refrigerant piping to the indoor unit............................................................................................ 92
8.3 Checking the refrigerant piping.............................................................................................................................................. 92
8.3.1 About checking the refrigerant piping................................................................................................................... 92
8.3.2 Precautions when checking the refrigerant piping ............................................................................................... 93
8.3.3 To check for leaks................................................................................................................................................... 93
8.3.4 To perform vacuum drying .................................................................................................................................... 94
8.3.5 To insulate the refrigerant piping .......................................................................................................................... 95
8.4 Charging refrigerant ............................................................................................................................................................... 95
8.4.1 About charging refrigerant .................................................................................................................................... 95
8.4.2 Precautions when charging refrigerant ................................................................................................................. 96
8.4.3 To determine the additional refrigerant amount.................................................................................................. 96
8.4.4 To determine the complete recharge amount...................................................................................................... 97
8.4.5 To charge additional refrigerant............................................................................................................................ 97
8.4.6 To fix the fluorinated greenhouse gases label....................................................................................................... 97
8.5 Preparing water piping ........................................................................................................................................................... 98
8.5.1 Water circuit requirements ................................................................................................................................... 98
8.5.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 102
8.5.3 To check the water volume and flow rate............................................................................................................. 102
8.5.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 104
8.5.5 To check the water volume: Examples .................................................................................................................. 105
8.6 Connecting water piping ........................................................................................................................................................ 105
8.6.1 About connecting the water piping ....................................................................................................................... 105
8.6.2 Precautions when connecting the water piping.................................................................................................... 106
8.6.3 To connect the water piping.................................................................................................................................. 106
8.6.4 To connect the water piping for domestic hot water ........................................................................................... 108
8.6.5 To connect the recirculation piping....................................................................................................................... 111
8.6.6 To fill the water circuit ........................................................................................................................................... 111
8.6.7 To fill the domestic hot water tank........................................................................................................................ 111
8.6.8 To insulate the water piping .................................................................................................................................. 112
8.1 Preparing refrigerant piping
8.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[410].
Also see "7.1.4 Special requirements for R32 units" [4 67] for additional
requirements.
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