STIEBEL ELTRON SOL 27 BASIC Bedienung Und Installation Seite 29

INSTALLATION
COMMISSIONING
Enable the gravity brake by turning the fill & drain valve to a
»
vertical position.
During normal operation, the shut-off valves upstream
!
of the air vent valves in close proximity to the collector
must always be kept closed.
The safety valve drain must terminate in a container
!
that can hold the entire system contents. In case of
smaller systems, the empty heat transfer medium
can is adequate. Dispose of spent process medium by
permissible means.
10.15 Thermal insulation
Ensure that the system undergoes a pressure test and a leak test
before applying thermal insulation.
Insulate all pipes. The insulation material is to be provided on site.
Internal pipe diameter Min. thickness of the insulation layer*
to 20 20
20 - 35 30
40 - 100 identical DN
above 100 100
* Minimum thickness of the insulation layer, relative to a thermal
conductivity of 0.035 W/(mK) at 40 °C.
For insulation material with a different thermal conductivity,
re-calculate the thickness of the insulation layer.
Use temperature and UV-resistant insulation material to provide
thermal insulation for the external pipes: Mineral wool which
is backed by aluminium mesh foil, a flexible EPDM hose or a
closed-pore EPDM hose.
It is advisable to use a fixed armour made of aluminium sheet
around the mineral wool. The EPDM hose can be finished with
UV-resistant paint.
Provide the collector sensor well and the roof outlet with
»
thermal insulation, which must be tightly sealed and must be
temperature and UV-resistant.
If necessary, cut into the side of the insulation material and seal
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the slit with adhesive tape after installation.
Where required, protect the thermal insulation against bird or
»
rodent attack.
11. Commissioning
Retighten all fittings.
»
Check the system's filling pressure.
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The minimum filling pressure of a cold system (below
!
30 °C) is 0.35 MPa (3.5 bar).
Check the pre-charge pressure of the expansion vessel.
»
The expansion vessel must have a pre-charge pressure
!
of 0.3 MPa (3 bar).
Complete the "Commissioning report".
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Set the integral control unit to manual. Please observe the
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operating and installation instructions of the control unit which
is fitted into the system.
Check whether all required relays of the solar control unit are
»
connected.
Set the control unit back to automatic mode.
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The system should then start automatically subject to all starting
conditions being met. If this is not the case, check in chapter
"What to do if ..." for a possible cause for this fault.
12. Maintenance
We offer you the opportunity to take out a maintenance
contract.
12.1 Maintenance
Check that the system, including the control unit, safety
»
equipment and cylinder, is functioning correctly.
Check the parts of the system exposed to the weather, mounting
»
fixtures and thermal insulation to ensure that they are in
acceptable condition.
Remove contaminants.
»
Check the pH value (> 7) and frost protection level (-- 30 °C) of
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the heat transfer medium. If necessary, replace the heat transfer
medium or top it up via the filler inlet in the solar module.
If the heat transfer medium needs to be drained to
!
carry out maintenance or repair work, this work must
be carried out by a qualified contractor.
Before you remove the heat transfer medium from
!
the collector, the collector must be protected from
daylight. Cover the collector with an opaque material.
SOL 27 BASIC | 29