Daikin EWAA011DAV3P - 8 Piping Installation; Preparing Water Piping; Water Circuit Requirements

8 | Piping installation
Installer reference guide
62
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06
8 Piping installation
In this chapter
8.1 Preparing water piping ........................................................................................................................................................... 62
8.1.1 Water circuit requirements ................................................................................................................................... 62
8.1.2 Formula to calculate the expansion vessel pre-pressure...................................................................................... 64
8.1.3 To check the water volume and flow rate............................................................................................................. 64
8.1.4 Changing the pre-pressure of the expansion vessel ............................................................................................. 67
8.1.5 To check the water volume: Examples .................................................................................................................. 67
8.2 Connecting water piping ........................................................................................................................................................ 68
8.2.1 About connecting the water piping ....................................................................................................................... 68
8.2.2 Precautions when connecting the water piping.................................................................................................... 68
8.2.3 To connect the water piping.................................................................................................................................. 68
8.2.4 To protect the water circuit against freezing ........................................................................................................ 70
8.2.5 To fill the water circuit ........................................................................................................................................... 73
8.2.6 To insulate the water piping .................................................................................................................................. 73
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9].
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.
▪ Freeze. Protect against freezing.
▪ Closed circuit. Use the outdoor unit ONLY in a closed water system. Using the
system in an open water system will lead to excessive corrosion.