Vaillant Solar hot water System Manual page 24

5 Installation
auroSTOR solar cylinders are available in three sizes:
200, 250 and 300 litres. The containers are made of
stainless steel and insulated with EPS.The cylinders are
equipped with all necessary cold and hot water control
devices and a motorised 2 port valve.
The auroSTOR cylinders are operated at the pressure of
the water supply pipe and do not need a cold water tank
for their supply. They have hot and cold water
connections of 22 mm diameter.A cold water supply of
appropriate pressure and flow rate is required to operate
the solar cylinder ideally (refer to Section 5.6.1, Cold
water supply pressure).
Control of the hot water temperature
The hot water temperature in the top half of the cylinder
can be optionally regulated by the Vaillant auroMATIC
VRS 560 solar control by means of the programmable
Vaillant VRT 360 room thermostat or a timer.
The temperature settings for solar water heating and
the maximum cylinder temperature are made by means
of this solar control, e. g. auroMATIC VRS 560. The
auroSTOR must be wired properly in order to adhere to
the G3 building regulations.
The solar pump must be connected to the solar control
via a thermal cut out (TCO) (refer to Section 5.8,
Electrical installation). It ensures the solar pump is
switched off if the hot water temperature in the cylinder
rises above 90°C.
Fig. 5.2 Attachment of the solar pump TCO
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VIH S GB 250 S and VIH S GB 300 S
The thermal cut out and temperature sensor have been
pre-installed by the manufacturer.
Fig. 5.3 NTC capillary tube guide
A VR 10 temperature sensor (1) must be used instead of
the installed thermostat if the auroMATIC VRS 560 is
used (refer to Section 5.8.2, Electrical connection to the
cylinder control device, for the removal of the
thermostat).
Immersion heater
The auroSTOR solar cylinders are equipped with an
additional immersion heater of 3 kW, including the
operating thermostat and energy cut-off device.The
immersion heater is situated behind the front plate. It is
designed for use in unvented cylinders and includes a
thermostat control and thermal cut out for over heat
protection.
Note:
In the event of a replacement, only the right
immersion heater equipped with a thermal cut
out fur overheating protection may be used.
Secondary return
The water control pack has a connection for a secondary
return.
• Remove the 3/4" dummy plug (BSP thread) from the
water control pack.
• Connect a WRAS-approved circulating pump, which
contains a non-return valve, to the water control pack
(see Fig. 5.1).
• Establish the connection to the secondary return.
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Manual - Solar hot water systems