Commissioning; Maintenance - Stiebel Eltron SOL 23 Premium Utilisation Et Installation

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backed by aluminium mesh foil, a flexible EPDM hose or a closed-
pore EPDM hose.
It is advisable to used a fixed armour made of aluminium sheet
for the mineral wool. The EPDM hose can be finished with UV-
resistant paint.
f Provide the collector sensor well, the fittings and the roof
outlet with thermal insulation, which must be tightly sealed
and must be temperature and UV-resistant.
f If necessary, cut into the side of the insulation material and
seal the slit with adhesive tape after installation.
f Protect the thermal insulation against bird or rodent attack.
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11. Commissioning

f Retighten all fittings.
f Check the system fill pressure.
Note
The minimum fill pressure of a cold system (below 30 °C)
is 0.35 MPa (3.5 bar).
f Check the pre-charge pressure of the pressure expansion
vessel.
Note
The pressure expansion vessel must have a pre-charge
pressure of 0.3 MPa (3 bar).
f Complete the "Commissioning report".
f Set the integrated control unit to manual. Observe the oper-
ating and installation instructions of the control unit which is
integrated into the system.
f Check whether all required relays of the solar control unit are
connected.
f Set the control unit back to automatic mode.
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

Note
We offer you the opportunity to take out a maintenance
contract.
12.1 Maintenance
f Check that the system, including the control unit, safety
equipment and cylinder, is functioning properly.
f Check the parts of the system exposed to the weather, fixings
and thermal insulation to ensure that they are in acceptable
condition.
f Remove contaminants.
f Check the pH value (> 7) and frost protection level (-30 °C) of
the heat transfer medium. If required, replace the heat trans-
fer medium. Use the filling connector in the solar station for
topping up.
CAUTION Injury
If the heat transfer medium needs to be drained to carry
out maintenance or repair work, this work must be car-
ried out by a qualified contractor.
Damage to the appliance and environment
Before you remove the heat transfer medium from the
collector, the collector must be protected from exposure
to light. Cover the collector with opaque material.
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