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Instructions on commissioning, maintenance, and troubleshooting for auroSTOR 0020111119_02
6 Installation
6.1 Installation
sequence
Install the solar heating system in the following order:
– Solar collectors and solar pump unit
– Cylinder
– Solar circuit piping
– Primary heating circuit piping
– Hot water piping, with secondary circulation line if requi-
red
– Cold water piping
– Discharge pipes
– Electrical installation
>
Assemble the collectors in accordance with the assembly
instructions supplied with the collector assembly set.
>
Install the solar pump unit in accordance with the instal-
lation instructions supplied with the solar pump unit.
>
For the rest of the installation process, proceed
as described in the sections below.
6.2
Installation of solar circuit piping
6.2.1
Piping material in the solar circuit
All Vaillant solar sets are supplied with pipes made from
stainless steel with DN fittings.
b
Caution!
Risk of damage to the system if the
wrong piping material is used in the solar
circuit!
The solar fluid can reach high temperatures
and leaks can occur if the wrong piping
material is used (e.g. PE pipes and Teflon
band).
>
You should preferably use copper pipes
in the solar circuit.
>
Use brazing solder to solder the piping
in the solar circuit.
>
Only use press fittings if the manufactu-
rer has stated that they can be used up
to
a temperature of 200 ºC.
6.2.2 Layout of piping in the solar circuit
The correct choice of pipe diameter is vital to ensure
the optimum efficiency of the solar heating system.
To keep the pressure loss in the solar circuit as low as
possible, the flow velocity in the pipe must not be more
than 1.5 m/s.
At the same time, the flow velocity must be at least
0.4 m/s to transport air bubbles from the collectors
downwards to the air vents (
¬
section 6.2.4
).
A nominal flow rate of 0.66 l/min is required for the flat
collectors and a nominal flow rate of 0.4 l/min per m
2
of
net collector area is required for the vacuum tube collec-
tors in order to achieve optimum heat transfer (
¬ table
6.1 and 6.2
).
A further decisive factor to ensure that your solar heat-
ing system works as well as possible is the correct solar
pump design. It must be possible for the solar pump to
convey more than the nominal flow rate at the specified
operating pressure. The selection of the required pump
speed depends on the installed system. For a reference
value for the selection of a solar pump, see section 7.4.
6 Installation
