Daikin Altherma 3 R F - Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements

8 | Piping installation
Installer reference guide
88
ERLA11~16D + EBVH16SU23D
Daikin Altherma 3 R F
4P655196-1A – 2022.05
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................................................................................................................................................... 88
8.1.1 Refrigerant piping requirements ........................................................................................................................... 88
8.1.2 Refrigerant piping insulation.................................................................................................................................. 89
8.2 Connecting the refrigerant piping.......................................................................................................................................... 89
8.2.1 About connecting the refrigerant piping............................................................................................................... 89
8.2.2 Precautions when connecting the refrigerant piping............................................................................................ 90
8.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 91
8.2.4 Pipe bending guidelines ......................................................................................................................................... 91
8.2.5 To flare the pipe end.............................................................................................................................................. 91
8.2.6 To braze the pipe end ............................................................................................................................................ 92
8.2.7 Using the stop valve and service port.................................................................................................................... 93
8.2.8 To connect the refrigerant piping to the outdoor unit ......................................................................................... 94
8.2.9 To connect the refrigerant piping to the indoor unit............................................................................................ 97
8.3 Checking the refrigerant piping.............................................................................................................................................. 97
8.3.1 About checking the refrigerant piping................................................................................................................... 97
8.3.2 Precautions when checking the refrigerant piping ............................................................................................... 98
8.3.3 Checking refrigerant piping: Setup ........................................................................................................................ 98
8.3.4 To check for leaks................................................................................................................................................... 98
8.3.5 To perform vacuum drying .................................................................................................................................... 99
8.4 Charging refrigerant ............................................................................................................................................................... 100
8.4.1 About charging refrigerant .................................................................................................................................... 100
8.4.2 Precautions when charging refrigerant ................................................................................................................. 101
8.4.3 Charging additional refrigerant.............................................................................................................................. 102
8.4.4 Completely recharging refrigerant ........................................................................................................................ 102
8.4.5 To fix the fluorinated greenhouse gases label....................................................................................................... 103
8.5 Preparing water piping ........................................................................................................................................................... 104
8.5.1 Water circuit requirements ................................................................................................................................... 104
8.5.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 108
8.5.3 To check the water volume and flow rate............................................................................................................. 108
8.5.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 110
8.5.5 To check the water volume: Examples .................................................................................................................. 111
8.6 Connecting water piping ........................................................................................................................................................ 111
8.6.1 About connecting the water piping ....................................................................................................................... 111
8.6.2 Precautions when connecting the water piping.................................................................................................... 112
8.6.3 To connect the water piping.................................................................................................................................. 112
8.6.4 To connect the water piping for domestic hot water ........................................................................................... 114
8.6.5 To connect the recirculation piping....................................................................................................................... 117
8.6.6 To fill the water circuit ........................................................................................................................................... 118
8.6.7 To fill the domestic hot water tank........................................................................................................................ 118
8.6.8 To insulate the water piping .................................................................................................................................. 118
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 68] for additional
requirements.