Daikin Altherma 3 H MT F - 8 Piping Installation; Preparing Water Piping; Water Circuit Requirements

8 | Piping installation
Installer reference guide
82
EPRA08~12EAV3+W1 + ETVH12SU18+23EA6V
Daikin Altherma 3 H MT F
4P644482-1 – 2021.03
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 ........................................................................................................................................................... 82
8.1.1 Water circuit requirements ................................................................................................................................... 82
8.1.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 86
8.1.3 To check the water volume and flow rate............................................................................................................. 86
8.1.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 88
8.1.5 To check the water volume: Examples .................................................................................................................. 89
8.2 Connecting water piping ........................................................................................................................................................ 89
8.2.1 About connecting the water piping ....................................................................................................................... 89
8.2.2 Precautions when connecting the water piping.................................................................................................... 90
8.2.3 To connect the water piping.................................................................................................................................. 90
8.2.4 To connect the water piping for domestic hot water ........................................................................................... 93
8.2.5 To connect the recirculation piping....................................................................................................................... 96
8.2.6 To fill the water circuit ........................................................................................................................................... 96
8.2.7 To protect the water circuit against freezing ........................................................................................................ 96
8.2.8 To fill the domestic hot water tank........................................................................................................................ 100
8.2.9 To insulate the water piping .................................................................................................................................. 100
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.