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

Page: 8 / 69

Manual - Solar hot water systems 0020009607_02 8
The Vaillant auroTHERM exclusive VTK 570 tube
collector, or auroTHERM VFK 900 and VFK 990/1 (6) flat
collector, transforms solar energy into heat and
transfers this thermal 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 in-line 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 room thermostat or VRC
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.
4 Description of the components
4.1 Collectors
H
Danger!
Danger of burning!
To avoid injuries due to hot parts of the collec-
tors, all work on the collectors should be carried
out on cloudy days. Alternatively, work can be
carried out in the morning or evening of sunny
days or with the collector covered..
4.1.1 auroTHERM exclusive tube collector
The VTK 570 tube collector has six tubes that are con-
nected hydraulically in parallel (Fig. 4.1).
The CPC mirror increases the solar yield by reflecting
the solar energy and focussing it on the tubes.
Fig. 4.1 auroTHERM exclusive VTK 570 tube collector
3 System description
4 Description of the components