To Connect A Pressure Vessel - Daikin ETSH12P30EF Installation Manual

7 Support the water piping.
For rearward facing connections: Support hydraulic lines suitably
according to the spatial conditions. This is valid for all water pipes.
b
c
a Space heating/cooling water OUT (screw connection, 1")
b Space heating/cooling water IN (screw connection, 1")
c Domestic hot water OUT (screw connection, 1")
d Domestic cold water IN (cold water supply)(screw
connection, 1")
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
Install air purge valves at all local high points.
ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663479-1A – 2022.07
a
d
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.
5.2.2

To connect a pressure vessel

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).
5 Piping installation
Installation manual
11