Safety Valve Discharge Pipework; Drain Valve - Vaillant uniSTOR VIH GB SERIES Instructions For Installation And Use Manual

The Vaillant uniSTOR is provided with an external
expansion vessel.
•
Connect the expansion vessel to the installed water
controls by either:
i. Screwing the vessel directly into the control assem-
bly at the purpose provided connection (1, fig. 8) or,
ii. Connecting the vessel to the control assembly via
copper pipe or a suitable approved flexible connec-
tion hose (4, fig. 8), ensuring that the vessel is
adequately supported.
Use the supplied Expansion Vessel Mounting
Bracket for wall installation.
•
Connect the balanced pressure cold water supply (if
required) to the cold water control pack (see fig. 8).
Note:
In areas where the mains water pressure is high
(4 bar or above) the cold water supply to a bath
or shower mixer valve can be taken from the
balanced pressure cold water outlet (5, fig. 8) of
the cold water controls. This will ensure that
both hot and cold supplies to the mixer valve
are at approximately the same pressure. The
cold water supply for all other terminal fittings
should be teed into the cold water supply
pipework to the uniSTOR upstream of the cold
water controls.
•
Connect the DHW outlet pipework to the 22 mm
domestic hot water outlet on the uniSTOR.
Continue with 22 mm size pipe to the first tee fitting
after which 15 mm pipework should be adequate.
If the pipe runs are of excessive length or there are
several terminal fittings supplied, extend the length of
pipework in 22 mm.
•
Connect the secondary return if required as shown in
4.2: Secondary Return.

5.4.3 Safety valve discharge pipework

•
Connect the temperature/pressure relief and
expansion relief valves to the tundish using 15 mm
pipe and install the discharge pipework from the
tundish in accordance with section 5.1.4: Discharge
Pipework.
uniSTOR GB

5.4.4 Drain Valve

The drain valve supplied with the uniSTOR has to be
fitted in the cold water mains supply between the
uniSTOR cylinder and the cold water control valves as
low as possible (see fig. 6)
We recommand to fit a hose pipe in the outlet of the
drain valve approximately 1 meter below the bottom of
the cylinder (this can be achieved by connecting a
suction hose to the outlet of the drain valve).
Flow rates from uniSTOR, hot 60 °C.
40
30
20
10
0
10
flow available (litres/min) at entry to system
Flow rates from uniSTOR, hot cold mixed.
Mixed water @ 40 °C, mixed from
60 % hot water @ 60 °C and
40
40 % cold water @ 10 °C
30
20
10
0
10
flow available (litres/min) at entry to system
Notes:
1) flow rates shown apply to situations where the supply is capable of supplying an adequate dynamic pressure.
3) where static water pressures are less than 1 bar, consult Vaillant Ltd.
* static supply pressure of incoming water supply.
Fig. 8a
Installation 5
8 bar*
4 bar*
3 bar*
2 bar*
1 bar*
20 30 40
8 bar*
4 bar*
3 bar*
2 bar*
1 bar*
20 30 40
15