Vaillant uniSTOR VIH SW GB 500 BES Installation And Maintenance Instructions Manual page 9

5.2.2 Connecting the product to the primary circuit
1. Connect the primary circuit to the inlet (12) and the out-
let (18).
– Minimum diameter of the copper pipe: ≥ 28 mm
Note
Ensure that the distance between the heat
generator and the product is as small as pos-
sible in order to prevent heat losses.
Alternatives 1:
2.
B
Installing a 3-port motorised valve for heat
pump systems
▶
Connect AB to the heating flow on the heat pump
(11), B to the flow on the heating circuit (10), and A
to the heating inlet on the cylinder (12).
▶
The 3-port motorised valve can be installed vertic-
ally or horizontally. For horizontal installation, align
the valve head so that it is facing upwards.
Alternatives 2:
2.
Installing the 2-port motorised valve for install-
ations that have a floor-standing boiler
▶
Install the 2-port motorised valve at the cylinder's
heating inlet (12) or heating outlet (18).
▶
For the 2-port motorised valve, follow the installation
direction that is marked by an arrow.
▶
The 2-port motorised valve can be installed vertic-
ally or horizontally. For horizontal installation, align
the valve head so that it is facing upwards.
5.2.3 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.
0020235301_03 uniSTOR Installation and maintenance instructions
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5.2.4 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.
3
2
1
7
1 Pressure reducer set
(1", 1.25", 1.5")
2 Cold water inlet
3 Pressure reducer (op-
tional)
(only 2")
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 to the drain cock. 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 41 mm
500 700 mm
5. Install a pipe between the safety assembly's connection
(4) and the temperature and pressure relief valve. Use
Installation 5
4
5
6
4 Expansion relief valve
5 Expansion relief valve
drain
6 Non-return valve
7 Manometer (optional)
Pre-charge pres-
sure of the expan-
sion vessel
0.3 MPa
(3.0 bar)
9