Lightning Protection; Earthing System; Expansion Vessel; Flushing The Pipework - Stiebel Eltron SOL 27 BASIC Utilisation Et Installation

10.6 Lightning protection

If the building already has a lightning protection system, the col-
lector casing, mounting frame and pipework must be connected
to the existing lightning protection scheme.
10.6.1 Collector casing lightning protection
Connect the collector to the lightning protection system using
screw fittings. Use two stainless steel self-tapping screws
(Ø 6.3 mm) per collector.
f Pre-drill the holes (Ø 5 mm). Position the drill holes on the
lower part of the front of the collector in the area which is
shaded in the following illustration. When drilling the holes,
maintain a distance of at least 100 mm from the corner of the
collector casing.
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1 Drill holes (Ø= 5 mm)
10.6.2 Mounting frame lightning protection
f Connect the mounting frame to the lightning protection sys-
tem using screw or clamp connections.
10.6.3 Pipework lightning protection
f Connect the pipework to the lightning protection system in
close proximity to the collector (above the roof) using pipe
clips.

10.7 Earthing system

f Earth the pipework in accordance with current regulations.
All pipes must be connected to the building earthing system via
a short connection.

10.8 Expansion vessel

f Set the expansion vessel to a pre-charge pressure of
0.3 MPa (3 bar).

10.9 Flushing the pipework

Before connecting the collectors, thoroughly flush the pipework
installed in the building with water so that no foreign matter
remains in the system.
Note
Flush the system with fresh water and not with heat
transfer medium.
Damage to the appliance and the environment
Avoid frost periods when you flush the system with water.
Use a powerful pump with an operating pressure of approximately
0.4 MPa (4 bar) for flushing.
Alternatively, you can also use a power drill pump.
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1 Solar compact installation
2 Heat transfer medium
3 Filter
4 Fill pump
Possible method:
f Connect the water supply to the fill & drain valve beneath the
pressure gauge
f Connect the water drain to the fill & drain valve beneath the
flow meter.
f Connect the solar flow and the solar return with a water
hose. This way, you replace the collector line which will not
be connected until later, and prevents contamination from
being drawn into the collector pipes.
f Close the adjusting valve in the solar module by turning the
slot on the flow rate adjusting screw (above the flow rate dis-
play) to the horizontal position. This ensures that the entire
system is supplied.
f Disable the gravity brake by turning the fill & drain valve to a
45° position.
f Close the shut-off valves upstream of the air vent valves.
f Flush the pipes for at least 15 minutes.
f After flushing, open the adjusting valve in the solar module
by turning the slot on the flow rate adjusting screw (above
the flow rate display) to the vertical position.
f Remove the hose which replaced the collector line and allow
the pipes to fully drain.
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