Vaillant uniSTOR VIH RW GB BES Series Installation And Maintenance Instructions Manual page 9

3
2
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)
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 group (2) to the drain valve. Consult
the table below to find out the length to which the pipe
should be cut.
Size of the Length of the pipe
cylinder that has a diameter
of 22 mm
150 800 mm
200 900 mm
250 1,150 mm
300 1,350 mm
Note
If you have to set up a secondary return,
install the T-piece supplied for the VIH RW
GB 250 BES and VIH RW GB 300 BES
products.
5. Install a pipe between the safety group's connection
(3) and the temperature and pressure expansion relief
valve. Use a T-piece for this. The pipe system must
continuously slope downwards, must be visible and
must be protected against frost. There must be no risk
of injury to persons.
0020221300_04 uniSTOR HP Installation and maintenance instructions
4
5
6
7
8
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)
Pre-charge pres-
sure of the expan-
sion vessel
0.3 MPa
(3.0 bar)
0.3 MPa
(3.0 bar)
0.3 MPa
(3.0 bar)
0.3 MPa
(3.0 bar)
–
Diameter of the pipe: 15 mm
–
Length of the pipe between the temperature and
pressure relief valve and the expansion relief valve
(4): ≤ 600 mm
6. Connect the cold water supply to the safety group (6).
– 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
1
D1
≥ 300 mm
D2
1 Temperature and pres-
sure expansion relief
valve
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
a sufficient distance from electrical components. The drain
pipes from the temperature and pressure relief valve and
from the expansion relief valve can be connected above the
tundish using a T-piece. The drain pipe from the 22 mm con-
nection of the tundish must consist of copper pipes with a
diameter of at least 22 mm and be connected to a safe and
visible drainage point. The vertical section of pipe beneath
the tundish must be at least 300 mm long before any bends
or diversions in the line. If the total resistance of the drain
pipework exceeds the values in the following table, you must
increase the diameter of the pipework. When installing the
drain pipework, comply with the standards, directives and
laws that are applicable in your country.
Installation 5
2
2 Tundish
9