Daikin ERLA03DAV3 - Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements

8 | Piping installation
Installer reference guide
64
ERLA03DAV3 + EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1B – 2021.10
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................................................................................................................................................... 64
8.1.1 Refrigerant piping requirements ........................................................................................................................... 64
8.1.2 Refrigerant piping insulation.................................................................................................................................. 65
8.2 Connecting the refrigerant piping.......................................................................................................................................... 65
8.2.1 About connecting the refrigerant piping............................................................................................................... 65
8.2.2 Precautions when connecting the refrigerant piping............................................................................................ 66
8.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 67
8.2.4 Pipe bending guidelines ......................................................................................................................................... 67
8.2.5 To flare the pipe end.............................................................................................................................................. 67
8.2.6 To braze the pipe end ............................................................................................................................................ 68
8.2.7 Using the stop valve and service port.................................................................................................................... 69
8.2.8 To connect the refrigerant piping to the outdoor unit ......................................................................................... 70
8.2.9 To connect the refrigerant piping to the indoor unit............................................................................................ 71
8.3 Checking the refrigerant piping.............................................................................................................................................. 71
8.3.1 About checking the refrigerant piping................................................................................................................... 71
8.3.2 Precautions when checking the refrigerant piping ............................................................................................... 72
8.3.3 Checking refrigerant piping: Setup ........................................................................................................................ 72
8.3.4 To check for leaks................................................................................................................................................... 72
8.3.5 To perform vacuum drying .................................................................................................................................... 73
8.4 Charging refrigerant ............................................................................................................................................................... 74
8.4.1 About charging refrigerant .................................................................................................................................... 74
8.4.2 Precautions when charging refrigerant ................................................................................................................. 75
8.4.3 To determine the complete recharge amount...................................................................................................... 75
8.4.4 To fix the fluorinated greenhouse gases label....................................................................................................... 75
8.5 Preparing water piping ........................................................................................................................................................... 75
8.5.1 Water circuit requirements ................................................................................................................................... 75
8.5.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 78
8.5.3 To check the water volume and flow rate............................................................................................................. 78
8.5.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 80
8.5.5 To check the water volume: Examples .................................................................................................................. 81
8.6 Connecting water piping ........................................................................................................................................................ 81
8.6.1 About connecting the water piping ....................................................................................................................... 81
8.6.2 Precautions when connecting the water piping.................................................................................................... 82
8.6.3 To connect the water piping.................................................................................................................................. 82
8.6.4 To connect the recirculation piping....................................................................................................................... 84
8.6.5 To fill the water circuit ........................................................................................................................................... 84
8.6.6 To fill the domestic hot water tank........................................................................................................................ 84
8.6.7 To insulate the water piping .................................................................................................................................. 85
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 "Special requirements for R32"[453] for additional requirements.
▪ Piping length: See "7.1.3Installation site requirements of the indoor unit"[452].
▪ Piping material: Phosphoric acid deoxidised seamless copper.