Intended Use - Vaillant aurotherm classic VFK 135/2 VD Installation Manual

1 Safety
▶ Wear suitable safety gloves.
1.2.7 Risk of injury due to breaking glass
The glass of the collectors may break due to
mechanical destruction or torsion.
▶ Wear suitable safety gloves.
▶ Wear suitable protective goggles.
1.2.8 Material damage caused by a high-
pressure cleaner
High-pressure cleaners may damage the
collectors due to the extremely high pressure.
▶ Never clean the collectors with a high-
pressure cleaner.
1.2.9 Material damage due to lightning
Lightning can damage the collector system.
▶ Connect the collector system to a lightning
protection device in accordance with ap-
plicable regulations.
1.2.10 Frost damage due to water in the
solar circuit
Water residue in the collector may freeze in
frosty conditions and damage the collector.
▶ Never fill or flush the collector with water.
▶ Only fill and flush the collector with Vaillant
ready-mixed solar fluid.
▶ Check the solar fluid regularly with an anti-
freeze tester.
1.2.11 Material damage due to frost
Frost may damage the collectors.
▶ Ensure that the system can be drained
completely.
The system can be drained completely if the
bottom edges of the collectors are aligned
precisely in a horizontal plane and the
pipeline has a steady downward gradient.
▶ During the installation, ensure that the bot-
tom edges of the collectors are positioned
above the cylinder connection.
1.2.12 Material damage due to an
unsuitable tool
An unsuitable tool may damage the solar
plant.
▶ Only use a suitable tool.
4
▶ In particular, only use the tool specified in
the work steps of this manual.
1.2.13 Risk of death from electric shock
Incorrect installation or a faulty power cable
can result in a supply voltage on the pipes,
which can cause life-threatening injuries.
▶ Secure earthing pipe clamps to the pipes.
▶ Connect the earthing pipe clamps to a
busbar using 16 mm² copper cable.
1.2.14 Material damage due to overvoltage
Overvoltage may damage the solar plant.
▶ Earth the solar circuit to provide equipoten-
tial bonding and overvoltage protection.
▶ Secure earthing pipe clamps to the pipes.
▶ Bond the earthing pipe clamps to a busbar
using 16 mm² copper cable.
1.2.15 Risk of death and material damage
due to contact corrosion
For roofs or façade sections made of metals
more precious than aluminium (e.g. copper
roof), contact corrosion may occur on the
brackets. Collectors could fall and put per-
sons at risk.
▶ Use suitable underlays to separate the
metals.
1.2.16 Material damage due to snow falling
from roofs
If the collector field is installed below a slop-
ing roof, then snow falling from the roof may
damage the collectors.
▶ Install snow fences above the collectors as
protection against falling snow.
1.3

Intended use

There is a risk of injury or death to the user or
others, or of damage to the product and other
property in the event of improper use or use
for which it is not intended.
The Vaillant VFK VD flat collector is used for
solar heating support and for solar-supported
hot water generation.
The collectors must only be operated with
Vaillant ready-mixed solar fluid. Passing
heating water or hot water directly through
the collectors constitutes improper use.
Installation manual auroTHERM classic 0020159946_01