Daikin Altherma 3 H HT - Piping installation; 8.1 Preparing water piping

8 | Piping installation
Installer reference guide
73
EPRA14~18D + ETVZ16S18+23E
Daikin Altherma 3 H HT F
4P644739-1A – 2022.03
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 water piping ........................................................................................................................................................... 73
8.1.1 Water circuit requirements ................................................................................................................................... 73
8.1.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 76
8.1.3 To check the water volume and flow rate............................................................................................................. 76
8.1.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 79
8.1.5 To check the water volume: Examples .................................................................................................................. 79
8.2 Connecting water piping ........................................................................................................................................................ 80
8.2.1 About connecting the water piping ....................................................................................................................... 80
8.2.2 Precautions when connecting the water piping.................................................................................................... 80
8.2.3 To connect the water piping.................................................................................................................................. 80
8.2.4 To connect the recirculation piping....................................................................................................................... 83
8.2.5 To fill the water circuit ........................................................................................................................................... 84
8.2.6 To protect the water circuit against freezing ........................................................................................................ 84
8.2.7 To fill the domestic hot water tank........................................................................................................................ 87
8.2.8 To insulate the water piping .................................................................................................................................. 88
8.1 Preparing water piping
8.1.1 Water circuit requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[410].
NOTICE
In case of plastic pipes, make sure they are fully oxygen diffusion tight according to
DIN4726. The diffusion of oxygen into the piping can lead to excessive corrosion.
▪ Connecting piping – Legislation. Make all piping connections in accordance with
the applicable legislation and the instructions in the "Installation" chapter,
respecting the water inlet and outlet.
▪ Connecting piping – Force. Do NOT use excessive force when connecting the
piping. Deformation of the piping can cause malfunctioning of the unit.
▪ Connecting piping – Tools. Only use appropriate tooling to handle brass, which is
a soft material. If NOT, pipes will get damaged.