Installation 5
0020221297_05 uniSTOR Installation and maintenance instructions
9
5.2.2
Installing the drain valve
The drain valve must be supplied by the customer.
Install the drain valve at the height of the cold water supply
or further below this level.
5.2.3
Installing the safety group
Caution.
Excessive pressure in the domestic hot
water cylinder
Excessive pressure in the domestic hot water
cylinder may cause the cylinder to burst.
▶
Ensure that the expansion relief valves
are not blocked.
▶
Ensure that there is no isolation valve
between the safety group and the cylin-
der.
2
3
4
5
6
7
8
1
1
Cold water with equal
pressure
2
Cold water inlet (22
mm)
3
Pressure reducer
4
Expansion relief valve
5
Outlet for the expansion
relief valve (15 mm)
6
Connection for the
expansion vessel (22
mm)
7
Flow of the cold water
supply to the cylinder
8
Connecting a mano-
meter (optional, not in-
cluded in the scope of
delivery)
1.
Before installation, flush the pipes in order to clear any
contamination and prevent the build up of dirt.
2.
Install the safety group horizontally and install the ex-
pansion relief valve so that it is facing upwards.
3.
Note the flow direction, which is specified by an arrow.
4.
Connect the safety assembly to the drain valve. Consult
the table below to find out the length to which the pipe
should be cut.
Size of the
cylinder
Length of the pipe
that has a diameter
of 22 mm
Pre-charge pres-
sure of the expan-
sion vessel
120
600 mm
0.3 MPa
(3.0 bar)
150
800 mm
0.3 MPa
(3.0 bar)
Size of the
cylinder
Length of the pipe
that has a diameter
of 22 mm
Pre-charge pres-
sure of the expan-
sion vessel
180
800 mm
0.3 MPa
(3.0 bar)
210
900 mm
0.3 MPa
(3.0 bar)
250
1,150 mm
0.3 MPa
(3.0 bar)
300
1,350 mm
0.3 MPa
(3.0 bar)
Note
If you have to set up a secondary return,
install the T-piece supplied for the VIH GB
250/3 BES and VIH GB 300/3 BES products.
5.
Install a pipe between the safety assembly's connection
(5)
and the temperature and pressure relief valve. Use
a T-piece for this. The pipe system must continuously
slope outwards, must be visible and must be protected
against frost. There must be no risk of injury to persons.
–
Diameter of the pipe: 15 mm
–
Length of the hose between the temperature and
pressure expansion relief valve and the expansion
relief valve
(4)
:
≤
600 mm
6.
Connect the cold water supply to the safety group
(2)
.
–
Diameter of the cold water supply pipe:
≥
22 mm
5.2.4
Installing an expansion vessel
1.
Install the expansion vessel close to the product.
2.
Install a pipe at the expansion vessel and connect the
terminal to the safety assembly
(6)
.
5.2.5
Installing a discharge pipe
≤ 600 mm
≥ 300 mm
D2
2
1
D1
1
Temperature and pres-
sure expansion relief
valve
2
Tundish
The drain connections of the temperature and pressure re-
lief valve and the expansion relief valve must be connected
to the supplied tundish via 15-mm-thick copper pipes. The
tundish must be installed vertically, as close to the cylinder
as possible and with a maximum clearance of 600 mm from
the connection of the temperature and pressure relief valve.
It must be installed in the same room as the cylinder, but at
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