Installation Procedure; Primary Pipework; Secondary System Pipework - Vaillant uniSTOR VIH GB 125 S Instructions For Installation And Use Manual

5 Installation

5.4 Installation procedure

•
Unpack the uniSTOR cylinder and check the contents
(detailed in section 4: notes to installers).
•
Position the uniSTOR in accordance with section 5.1.1:
Siting

5.4.1 Primary pipework

To prevent the uniSTOR from overheating the 2 port
motorised valve supplied with the boiler must be fitted
to the primary flow to the indirect coil (see figure 5).
´B´ Port
Fig. 7

5.4.2 Secondary system Pipework

•
Connect the two cold water control valves together as
shown in fig. 8, ensuring that the orientation of the
valves, when installed in the cold mains supply, allows
the 15 mm outlet of the expansion relief valve to be
connected to the tundish.
•
Install the discharge pipe from the expansion relief
valve so that it has a contimous fall to outside in a
safe and visible position where it will be unaffected by
frost.
Never close the outlet of the expansion relief valve.
•
Activate the expansion relief valve regularly to prevent
from calcination.
•
Provide a cold water mains supply to the uniSTOR.
To ensure optimum performance from the uniSTOR,
and particularly in installations where the balanced
pressure cold water outlet (5, fig. 8) is to be used, the
pipework provided from the building mains stop valve
to the uniSTOR cylinder should be minimum 22 mm
copper tube.
14
A B
´A´ Port
•
Install the drain valve in the cold mains supply
between the uniSTOR cylinder and the cold water
control valves at the lowest point.
•
Install the assembled cold water control valves (fig. 8)
in the cold mains supply at a convenient position
adjacent to the uniSTOR cylinder, ensuring adequate
space exists for service access and allow for
connection of the discharge pipe from expansion relief
valve.
3
A
Fig. 8
A Mains Cold water inlet
B Connection to cylinder
1 Connection to expansion vessel
2 Expansion relief valve
3 Pressure limiting valve combined with strainer
4 Secondary return connection
5 Balanced pressure cold water outlet
Important
No isolate valve shall be installed between the
assembled cold water control valves and the
cylinder.
5 4 1
2 B
uniSTOR GB