Piping Installation; Preparing Water Piping; Water Circuit Requirements - Daikin EWYA004D2V3P Installer's Reference Manual

8 Piping installation

In this chapter

8.1 Preparing water piping

8.1.1 Water circuit requirements

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B - 2022.09
8.1 Preparing water piping ...........................................................................................................................................................
8.1.1 Water circuit requirements ...................................................................................................................................
8.1.2 Formula to calculate the expansion vessel pre-pressure......................................................................................
8.1.3 To check the water volume and flow rate.............................................................................................................
8.1.4 Changing the pre-pressure of the expansion vessel .............................................................................................
8.1.5 To check the water volume: Examples ..................................................................................................................
8.2 Connecting water piping ........................................................................................................................................................
8.2.1 About connecting the water piping .......................................................................................................................
8.2.2 Precautions when connecting the water piping....................................................................................................
8.2.3 To connect the water piping..................................................................................................................................
8.2.4 To protect the water circuit against freezing ........................................................................................................
8.2.5 To fill the water circuit ...........................................................................................................................................
8.2.6 To insulate the water piping ..................................................................................................................................
INFORMATION
Also read the precautions and requirements in the
4
precautions" [
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.
- When using non-brass metallic piping, make sure to insulate both materials
from each other to prevent galvanic corrosion.
- Because brass is a soft material, use appropriate tooling for connecting the
water circuit. Inappropriate tooling will cause damage to the pipes.
▪ 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.
9].
8 Piping installation
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"2 General safety
Installer reference guide
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