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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. Make
sure it is NOT between the pressure relief valve and
the storage tank.
▪ It is recommended to install a pressure reducing valve
on the cold water inlet in accordance with the
applicable legislation.
▪ It is recommended to install an expansion vessel 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).
5.2.3
To fill the heating system
DANGER: RISK OF ELECTROCUTION
During the filling process, water can escape from any
leaking point and can cause an electrical shock if it comes
into contact with live parts.
▪ Before the filling process, de-energise the unit.
▪ After the first filling and before switching on the unit
with the mains switch, check whether all electric parts
and connection points are dry.
ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
4P679468-1B – 2022.09
1 Connect a hose with a non-return valve (1/2") and an external
manometer (field supply) to a water tap and the fill and drain
valve. Secure the hose against slipping off.
B
e.1
e.2
j/k
AB
A
f
a
g
b
i
h
a
Hose with a non-return valve (1/2") and an external
manometer (field supply)
b
Fill and drain valve
c
Space heating/cooling water OUT
d
Space heating/cooling water IN
e.1
Valve motor
e.2
Valve motor latch
f
Water tap
g
Automatic air purge valve
h
Pressure gauge (field supply)
i
Pressure vessel (field supply)
j
Bypass valve
k
Tank valve
2 Prepare for air purging according to the instructions (see
purge" [ 4 39]).
"8.2.2 To perform an air
3 Open the water tap.
4 Open fill and drain valve and monitor the manometer.
5 Fill the system with water until the external manometer shows
that the system target pressure is reached (system height +2 m;
1 m water column = 0.1 bar). Make sure that the pressure relief
valve does not open.
6 Close the manual air vent valves as soon as water emerges
free of bubbles.
7 Close the water tap. Keep the fill and drain valve open in case it
is necessary to repeat the filling procedure after the air purging
of the system. See
"8.2.2 To perform an air
8 Close the fill and drain valve and remove the hose with non-
return valve only after air purging is performed and the system
is completely filled.
5 Piping installation
50%
100%
0%
CH
Bypass
(B)
(A)
d
c
j
k
50%
100%
0%
CH
DHW
(A)
(B)
purge" [ 4 39].
Installation manual
13
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