Vaillant Solar System and auroSTOR unvented solar..., Start-Up, Maintenance And Troubleshooting Manual

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Manual - Solar hot water systems 0020009607_02 38
a
Danger!
Risk of bursts for the solar cylinder due to
overpressure!
The outlet of the expansion relief valve may not
be covered or closed.
• Test the expansion relief valve (Fig. 5.16, pos. 2 )
regularly to avoid calcification.
• Connect the solar cylinder to the cold water supply
(Fig. 5.16, pos. B ).
To ensure an optimum performance of the solar cylinder,
in particular in installations in which the pressure-
controlled cold water outlet (Fig. 5.16, pos.
5 ) is used,
copper pipes with a diameter of at least 22 mm should
be used for the pipe from the main stop valve of the
building to the solar cylinder.
•
Install the drain valve in the cold water supply at the
lowest point between the solar cylinder and the water
control pack (see Fig. 5.9).
• Install the assembled water control pack in the cold
water supply at an appropriate place next to the solar
cylinder.Make sure there is sufficient space for
maintenance and the connection of the discharge pipe
from the expansion relief valve.
If the discharge pipes are all together, the expansion
relief valve may not be installed more than 500 mm
away from the temperature and pressure relief valve
(see
2 and 8 , Fig. 5.1).
a Caution!
Risk of bursts for the solar cylinder!
No stop valve may be installed between the cold
water control pack and the cylinder.
The Vaillant solar cylinder is supplied with an external
hot water expansion vessel (DW EV).
Connect this expansion vessel to the installed water
control pack as follows:
• Screw the expansion vessel directly onto the water
control pack (Fig. 5.16, pos. 4 ) via the connection
intended for this purpose or
• Connect the expansion vessel to the water control
pack with a copper pipe or an appropriate hose. Make
sure the expansion vessel is supported sufficiently.
Use the supplied mounting bracket if the expansion
vessel is to be mounted on the wall.
• Establish (if necessary) the connection to the
pressure-controlled cold water connection of the water
control pack (see
5 , Fig. 5.16).
h
Note!
In areas with high water pressure (4 bar or
more), a bath or shower mixer valve can also be
connected to the pressure-controlled cold water
connection (4, Fig. 5.16) of the water control
pack to ensure the pressure of the hot and cold
water supply to the mixer valve is about the
same. The cold water supply for all other
connections should be installed in front of the
water control pack in the cold water supply to
the solar cylinder by means of a T-piece.
5.6.3 Drain valve
The drain valve supplied with the auroSTOR must be
installed as low as possible in the cold water supply
between the solar cylinder and the water control pack
(see Fig. 5.1).
We recommend applying a hose which reaches about 1 m
under the base of the cylinder to the outlet of the drain
valve.
Pipe for the outlet of the expansion relief valve
• Connect the temperature and pressure relief valve and
the expansion relief valve to the tundish with a 15 mm
pipe and lay the discharge pipe from the tundish as
described in Section 5.7.1, Discharge pipework.
5.7 Discharge pipework
5.7.1 Discharge pipework
The outlet connections of both the temperature and
pressure relief valve and expansion relief valve should
be connected in 15 mm copper tube to the tundish
supplied. The tundish should be installed vertically, as
close to the uniSTOR as possible and within 500 mm of
the temperature and pressure relief outlet. It must be
positioned away from any electrical components and
installed in the same space as the uniSTOR cylinder, so
that it is visible to the user. The D1 discharge pipe from
the T&P Valve/Expansion valve can be teed together
upstream of the tundish (see fig. 5.1).
The discharge pipework must be installed using
minimum 22 mm copper pipework from the 22 mm
connection on the tundish to a safe and visible discharge
point.
There must be a vertical section of pipe at least 300 mm
long, below the tundish before any bends or elbows in
the pipework. Increase the diameter of the pipework if
the total resistance of the discharge pipework exceeds
the figures shown in the table below. The installation of
the discharge pipework must be in accordance with G3
(refer to Section 2.2, Regulations in Great Britain).
5 Installation