To Connect A Pressure Vessel - Daikin Altherma 3 H MT ECH2O Installer's Reference Manual

8 | Piping installation

8.2.4 To connect a pressure vessel

Installer reference guide
94
NOTICE
It is recommended to install shut-off valves on the space heating/cooling water in
and out connections, as well as on the domestic cold water in and domestic hot
water out connections. These shut-off valves are field supplied.
NOTICE
To avoid damage to the surroundings in case of water leakage, it is recommended to
close the domestic cold water inlet shut‑off valves during periods of absence.
NOTICE
Install air purge valves at all local high points.
NOTICE
A pressure relief valve (field supply) with an opening pressure of maximum 10 bar
(=1 MPa) must be installed on the domestic cold water inlet connection in
accordance with the applicable legislation.
NOTICE
▪
A drain device and pressure relief device must be installed on the cold water inlet
connection of the storage tank.
▪
To avoid back siphonage, it is recommended to install a non-return valve on the
water inlet of the storage tank in accordance with the applicable legislation.
▪
It is recommended to install a pressure reducing valve on the cold water inlet in
accordance with the applicable legislation.
▪
An expansion vessel should be installed on the cold water inlet in accordance
with the applicable legislation.
▪
It is recommended to install the pressure relief valve on a higher position than
the top of the storage tank. Heating of the storage tank causes water to expand
and without pressure relief valve the water pressure of the domestic hot water
heat exchanger inside the tank can rise above design pressure. Also the field
installation (piping, tapping points, etc.) connected to the tank is subjected to this
high pressure. To prevent this, a pressure relief valve needs to be installed. The
overpressure prevention depends on the correct operation of the field installed
pressure relief valve. If this is NOT working correctly, water leakage may occur. To
confirm good operation, regular maintenance is required.
1 Connect a suitably dimensioned and preset pressure vessel for the heating
system. There may not be any hydraulic blocking elements between the heat
generator and the safety valve.
2 Position the pressure vessel in an easily accessible place (maintenance, parts
replacement).
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1 – 2021.07