Daikin Altherma 3 H HT EPRA14DAW1, Installer'S Reference Manual

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7 | Piping installation
Installer reference guide
74
EPRA14~W1 + ETVH/9W(G)
Daikin Altherma 3 H HT F
4P587502-1A – 2020.01
7 Piping installation
In this chapter
7.1 Preparing water piping ........................................................................................................................................................... 74
7.1.1 Water circuit requirements ................................................................................................................................... 74
7.1.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 76
7.1.3 To check the water volume and flow rate............................................................................................................. 76
7.1.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 79
7.1.5 To check the water volume: Examples .................................................................................................................. 79
7.2 Connecting water piping ........................................................................................................................................................ 80
7.2.1 About connecting the water piping ....................................................................................................................... 80
7.2.2 Precautions when connecting the water piping.................................................................................................... 80
7.2.3 To connect the water piping.................................................................................................................................. 80
7.2.4 To connect the recirculation piping....................................................................................................................... 82
7.2.5 To fill the water circuit ........................................................................................................................................... 83
7.2.6 To protect the water circuit against freezing ........................................................................................................ 83
7.2.7 To fill the domestic hot water tank........................................................................................................................ 86
7.2.8 To insulate the water piping .................................................................................................................................. 86
7.1 Preparing water piping
7.1.1 Water circuit requirements
INFORMATION
Also read the precautions and requirements in the "General safety precautions"
chapter.
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.
▪ Connecting piping – Air, moisture, dust. If air, moisture or dust gets into the
circuit, problems may occur. To prevent this:
- Only use clean pipes
- Hold the pipe end downwards when removing burrs.
- Cover the pipe end when inserting it through a wall, to prevent dust and/or
particles from entering the pipe.
- Use a decent thread sealant to seal connections.
▪ Insulation. Insulate up to the base of the heat exchanger.
▪ Freeze. Protect against freezing.
▪ Closed circuit. Use the indoor unit ONLY in a closed water system. Using the
system in an open water system will lead to excessive corrosion.