Solar working station operation manual SR881
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Attach the front half of the insulation to the station.
3. Commissioning of station
Attention: Risk of scalding!
In order to prevent the boiling of solar fluid in the collectors, the system should not be
flushed or filled during periods of strong sunshine.
Attention: Risk of frost!
Solar thermal system cannot be completely emptied after flushing. There is a danger of frost
damage if water is used for flushing. Only use solar fluid to flush and fill the solar thermal
system. Use water
–propylene glycol mixture as solar fluid (Maximum 50% propylene
glycol).
3.1 Flushing and filling the solar system
Flushing and filling unit is optional component, it can be installed horizontally at the lowest
point of the solar circuit (see figure). A filter must be installed between the store and solar
pump in order to prevent the flushed-out scale from store re-entering the solar circuit.
Flushing and filling steps:
Disconnect the expansion vessel from the solar thermal system.
Connect the pressure hose of a flushing and filling station to the fill ball valve (1) of
flushing and filling unit.
Connect the flushing hose of a
flushing and filling station to the
drain ball valve (3) of flushing
and filling unit.
Close the ball valve (2) in the
centre of the flushing and filling
unit.
Open the filling ball valve (1) and
drain ball valve (3).
Flush the solar thermal system
using the flushing and filling station for at least 15minutes to remove all air from the
system.
During the flushing, bleed the solar thermal system several times at the airstopp until
the discharged solar fluid is free of air bubbles.
