7
Manual - Solar hot water systems
The Vaillant auroTHERM exclusive tube collector (
6
)
transforms solar energy into heat and transfers the heat
energy to a frost-protected solar fluid. The solar pump
of the solar pump unit (
7
) ensures the heat is
transported from the collector to the bivalent solar
cylinder (
2
) via a pipe system. The solar pump unit is
controlled by the solar control.
The solar control switches the solar pump
on or off as
soon as the difference in temperature between the
collector and solar cylinder falls below or exceeds the
preset value. If the solar energy is insufficient, the
control system switches on the boiler (
1
) so that the
upper third of the cylinder is reheated to the set value
for the hot drinking
water temperature. In addition the
solar cylinder can be reheated by the
immersion heater
installed by the manufacturer.
The solar expansion vessel (
9
) compensates pressure
fluctuations in the solar circuit.
The optional protection vessel (
8
) protects the
expansion vessel from increased temperatures in the
solar circuit. We recommend installing a protection
vessel.
The Vaillant solar system enables various system
configurations and control concepts:
Electrical wiring
The Vaillant Control Center VR 65 can be used to wire
up the system if an eBUS-capable Vaillant boiler is used.
A standard wiring box can be used if a Vaillant boiler
which is not eBUS-capable or an external boiler is used.
Control of the hot
water temperature
The hot water temperature in the upper third of the
cylinder can be controlled by the VRS 560 or by a
separate hot water programmer.
d
Danger!
Risk of being scalded by hot water to provide
effective protection against scalding, install a
thermostat mixer in the hot water pipe as
described in Section 5.5, Installation of the hot
drinking water pipework. Set the thermostat
mixer to below 60 °C and check the
temperature at a hot water tap.
Heating control
The heating can be regulated by means of a
programmable Vaillant VRT 360 room thermostat or
VRC 400 weather compensator if an eBUS-capable
Vaillant boiler is used.
The Vaillant VRT 30 room thermostat or a standard
room thermostat can be used if a non-eBUS Vaillant
boiler or an external boiler is used.
The solar system is a closed system and must be bled
carefully. We recommend the automatic Vaillant air
separator system for this purpose (item no. 302 418). It
works fully automatically and does not need to be
subsequently blocked.
The automatic air separator system must be installed in
an area in which no steam can enter, preferably in the
return pipe between the solar pump unit and the solar
cylinder.
System description 3
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