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Piping installation
Installer reference guide
76
EPRA14~W1 + ETVH/9W(G)
Daikin Altherma 3 H HT F
4P587502-1A – 2020.01
▪
Air vents.
Provide air vents at all high points of the system, which must also be
easily accessible for servicing. Two automatic air purges are provided in the
indoor unit. Check that the air purges are NOT tightened too much, so that
automatic release of air in the water circuit is possible.
▪
Zn-coated parts.
Never use zinc coated parts in the water circuit. Because the
internal water circuit of the unit uses copper piping, excessive corrosion may
occur.
▪
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 or a 3-way valve in the
water circuit, the maximum change-over time of the valve must be 60 seconds.
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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
domestic hot water tank, see
163].
▪
Thermostatic mixing valves.
In accordance with the applicable legislation, it may
be necessary to install thermostatic mixing valves.
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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
7.1.2 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)
7.1.3 To check the water volume and flow rate
The indoor unit has an expansion vessel of 10 litre with a factory-set pre-pressure
of 1 bar.
To make sure that the unit operates properly:
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