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Piping installation
Installer reference guide
71
EWSAH/X06D
Daikin Altherma 3 WS
4P675764-1 – 2022.04
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Connecting piping – Air, moisture, dust.
If air, moisture or dust gets into the
circuit, problems may occur. To prevent this:
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ONLY use clean pipes.
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Hold the pipe end downwards when removing burrs.
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Cover the pipe end when inserting it through a wall, to prevent dust and/or
particles from entering the pipe.
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Use a decent thread sealant to seal connections.
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When using non-brass metallic piping, make sure to insulate both materials
from each other to prevent galvanic corrosion.
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Because brass is a soft material, use appropriate tooling for connecting the
water circuit. Inappropriate tooling will cause damage to the pipes.
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Closed circuit.
Use the indoor unit ONLY in a closed water system for the central
water loop circuit and the space heating circuit. Using the system in an open
water system will lead to excessive corrosion.
WARNING
When connecting to an open groundwater system, an intermediate heat exchanger
is required to prevent damage (dirt, freeze ups) to the unit.
Expansion vessel – Space heating circuit.
To avoid cavitation, install an expansion
vessel (field supply) on the entering pipe before the water pump and within 10 m
of the unit.
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Glycol.
For safety reasons, it is NOT allowed to add any kind of glycol to the
space heating circuit.
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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.
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Piping diameter.
Select the piping diameter in relation to the required flow and
the available external static pressure of the pump. See
236] for the external static pressure curves of the indoor unit.
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Fluid flow.
Depending on the type of operation, the minimum required flow can
be different. Also see
"8.1.3 To check the water volume and flow rate of the
space heating circuit and the central water loop circuit"
74].
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Field supply components – Fluid.
Only use materials that are compatible with
fluid used in the system and with the materials used in the indoor unit.
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Field supply components – Fluid pressure and temperature.
Check that all
components in the field piping can withstand the fluid pressure and fluid
temperature.
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Fluid pressure – Space heating and central water loop circuit.
The maximum
fluid pressure is:
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For the space heating circuit: 3 bar (0.3 MPa),
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For the central water loop ciruit: 16 bar (1.6 MPa).
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Fluid pressure – Domestic hot water tank.
The maximum fluid pressure of the
domestic hot water tank is 10 bar. Provide adequate safeguards in the water
circuit to ensure that the maximum pressure is NOT exceeded.
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Fluid temperature.
All installed piping and piping accessories (valve,
connections,…) MUST withstand the following temperatures:
