System 3
0020160592_00 auroFLOW plus Instructions for use 5
3.1.3 Functionality
The way the auroFLOW plus solar system operates is dif-
ferent to many other solar systems. The auroFLOW plus
solar system is not completely filled with solar fluid and it is
not under pressure. For this reason, some of the otherwise
standard components for solar systems, such as the expan-
sion vessel, pressure gauge and air vent, are not fitted.
When the solar pump is idle, the solar fluid is collected in
the storage tank. The collector field and all solar lines are
installed with downward gradients, to ensure that the solar
fluid flows back to the solar charger. The solar lines and the
collector field are then filled with air. The solar fluid is a spe-
cial ready-mixed water/glycol fluid that is added to the solar
system during installation by the competent person.
When the solar control activates the solar pump, the solar
pump pumps the solar fluid from the storage tank through
the solar return into the collector field. The solar fluid is
heated at this point, before flowing back to the solar charger
via the solar flow pipe.
– When the solar pump is idle, there is air in the collectors
and solar lines. Frost protection measures are therefore
only required for the installation site of the solar charger.
– The collector field and solar lines, and especially the
downward gradient of the lines, must be installed as spe-
cified to ensure that the solar system functions correctly.
– The fluid capacity of the collector field and the solar lines
is precisely designed with the solar system in mind.
– The minimum length and the maximum length of the
solar lines must be observed
– All solar lines have defined diameters in relation to
the number of collectors
– The use of corrugated hoses impairs the functionality
of the solar system
– The design and number of collectors must not be
changed
– The physical properties of the solar fluid are also an im-
portant contributing factor to the fault-free operation of
the system. Therefore, only original Vaillant solar fluid
without additives may be added to the system.
3.1.4 Product function
1
2
T5
T1
T3
T2
T4
T6
P3
P2
P1
STW1
STW2
3
9
8
7
4
6
5
Flowsensor
The way the basic module of the solar charger operates is
described below.
If the expansion module is also installed,
– the solar fluid volume is doubled by a separate storage
tank connected in parallel
– the pump output is higher as a result of two solar pumps
connected in series
The way the solar charger operates remains the same, how-
ever.
When the solar pump is idle, only the storage tank (8) con-
tains solar fluid. The collectors (1) and solar lines (2) and (9)
are then filled with air.
The solar control in the solar charger activates the solar
pump whenever
– the temperature difference between the collector temper-
ature sensor (T5) and cylinder temperature sensor (T6) is
at least 15 K (if a system controller is connected, the cyl-
inder temperature is transmitted to the solar control via
the eBUS line)
– the cylinder temperature is lower than the set maximum
cylinder temperature
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