Technical data

18 Instructions on commissioning, maintenance, and troubleshooting for auroSTOR 0020111119_02
4.3.2 Control functions
Hot water temperature control
The hot water temperature in the top half of the cylinder
can be controlled in one of the following ways:
– Vaillant auroMATIC VRS 560/2 solar controller or
– using one of the Vaillant Control Centre‘s with the Vail-
lant dual-channel eBUS controller
– Vaillant VRC weather compensator with VR 61/2 mixer
module and VR68/2 solar module or
– using the cylinder thermostat in conjunction with a timer.
If you are using a controller by a third-party manufac-
turer, you use this controller to adjust the hot water
temperature. In this case, the Vaillant controller (e.g.
auroMATIC 560/2) acts only as a solar controller and
only controls the temperatures for solar water heating.
Solar circuit control system
The solar circuit can be controlled in one of the follow-
ing ways:
VRS560/2
(connection wiring diagrams 1, 2, 3, 4, and 6,
¬section6.8)
The lower cylinder sensor (SP 2) and the solar yield
temperature sensor are connected up to the VRS 560/2.
The solar pump is controlled via the VRS560/2.
VRC with VR 68/2
(connection wiring diagram 5, ¬ section 6.8)
The lower cylinder sensor (SP 2) and the solar yield
temperature sensor are connected up to the VR68/2.
The solar pump is controlled via a VRC.
1
230 V~
3
A
C
D
B
4
2
6
SP 1
SP 2
7
Kol 1
5
Fig. 4.5 Temperature differential control of solar pump
Key
1 Solar controller or solar module
2 Gas-fired wall-hung boiler
3 Solar cylinder
4 Solar circuit thermal cut-out
5 Solar yield temperature sensor
6 Solar pump
7 Solar pump unit
Kol 1 Collector sensor for flow line collector temperature
SP1 Cylinder sensor for upper cylinder temperature
(primary heating circuit/standby section)
SP2 Cylinder sensor for lower cylinder temperature (solar circuit)
A Primary heater flow
B Primary heater return
C Solar flow
D Solar return
Temperature differences, not absolute temperature val-
ues, are important for the operation of solar heating
systems. For this reason, solar heating systems are con-
trolled via temperature differential controllers.
Integrated temperature sensors record the temperature
difference between the collector and the cylinder.
If the temperature difference (Kol 1–SP2) is larger than
7K, the solar heating system's solar pump is switched on.
If the temperature difference (Kol 1–SP2) is smaller
than 3K, the solar heating system's solar pump is
switched off.
4 Description of the components