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8 | Piping installation

Installer reference guide

EKHWET90~120BAV3

R32 Split series – Domestic hot water tank

4P680077-1 – 2021.11

a Refrigerant liquid stop valve

b Refrigerant gas stop valve

2 Connect the gas stop valve from the outdoor unit to the refrigerant gas stop

valve of the indoor unit.

8.3 Preparing water piping

8.3.1 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.

- 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.

▪ Glycol. For safety reasons, it is NOT allowed to add any kind of glycol to the

water circuit.

▪ Piping length. It is recommended to avoid long runs of piping between the

domestic hot water tank and the hot water end point (shower, bath,…) and to

avoid dead ends.

Daikin R32 Split Series Installer's Reference Guide

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