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Piping installation
Installer reference guide
73
EWSAH/X06D
Daikin Altherma 3 WS
4P675764-1 – 2022.04
INFORMATION
Be aware of the hygroscopic property of anti-freeze fluids: it absorbs moisture from
its environment. Leaving the cap off the anti-freeze fluid container causes the
concentration of water to increase. The anti-freeze fluid concentration is then lower
than assumed. And in consequence, freezing can happen after all.
Preventive actions MUST be taken to ensure minimal exposure of the anti-freeze
fluid to air.
▪
Non-brass metallic piping.
When using non-brass metallic piping, insulate the
brass and non-brass properly so that they do NOT make contact with each other.
This to prevent galvanic corrosion.
▪
Valve – Change‑over time.
When using a 2-way valve in the space heating
circuit, the maximum change-over time of the valve MUST be 60 seconds.
▪
Filter.
It is strongly recommended to install an additional filter on the heating
water circuit. Especially to remove metallic particles from foul heating piping, it is
recommended to use a magnetic or cyclone filter, which can remove small
particles. Small particles may damage the unit and will NOT be removed by the
standard filter of the heat pump system.
▪
Domestic hot water tank – Capacity.
To avoid stagnation of water, it is
important that the storage capacity of the domestic hot water tank meets the
daily consumption of domestic hot water.
▪
Domestic hot water tank – After installation.
Immediately after installation, the
domestic hot water tank must be flushed with fresh water. This procedure must
be repeated at least once a day the first 5 consecutive days after installation.
▪
Domestic hot water tank – Standstills.
In cases where during longer periods of
time there is no consumption of hot water, the equipment MUST be flushed with
fresh water before usage.
▪
Domestic hot water tank – Disinfection.
For the disinfection function of the
176].
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Thermostatic mixing valves.
In accordance with the applicable legislation, it may
be necessary to install thermostatic mixing valves.
▪
Hygienic measures.
The installation must be in compliance with the applicable
legislation and may require additional hygienic installation measures.
▪
Recirculation pump.
In accordance with the applicable legislation, it may be
required to connect a recirculation pump in between the hot water end point
and the recirculation connection of the domestic hot water tank.
c
d
a
b
a
Recirculation connection
b
Hot water connection
c
Shower
d
Recirculation pump
8.1.2 Formula to calculate the expansion vessel pre-pressure
The pre-pressure (Pg) of the vessel depends on the installation height difference
(H):
Pg=0.3+(H/10) (bar)