Flushing And Filling The Solar System - CALPAK FlowSol S Installation

3 Flushing and filling the solar
system
Scald danger!
WARNING!
Pressure surge damage!
If the medium enters strongly heat-
ed, empty collectors, pressure surg-
es caused by evaporation can occur.
Î In order to prevent the solar
fluid from vaporising inside
the collectors, do not fill
or flush the system during
times of strong irradiation!
Before flushing the system
Î Disconnect the expansion vessel from the solar
thermal system.
2.
Î Connect the pressure hose of the filling and
flushing station to the fill valve (5) of the pump
station.
Î Connect the flushing hose of the filling and flushing
station to the drain valve (3) of the pump station.
5
Î Close the ball valve of the pump station (4).
Î Open the fill valve (5) and the drain valve (3).
4
Î Switch on the filling pump of the filling and flush-
ing station.
Î Flush the solar thermal system for at least 15
minutes by means of the filling and flushing sta-
tion until the discharged solar fluid is free of gas
3
bubbles and dirt particles.
Î During flushing, bleed the solar thermal system
several times until the discharged solar fluid (e. g.
Tyfocor , see chap. 10) is free of air bubbles.
®
Î Open the ball valve (4) of the pump station.
After flushing the system
Î Connect the expansion vessel to the solar ther-
mal system
Î Close the drain valve (3) of the pump station
while the filling pump is running.
Î Increase system pressure (approx. 3.5 - 4 bar).
The system pressure can be read from the pres-
sure gauge.
Î Close the fill valve (5).
Î Switch off the filling pump.
Î Check the pressure gauge to see whether the
system pressure reduces and eliminate leaks
where necessary.
Î Slowly discharge the heat transfer fluid by means
of the drain valve (3) until the operating pressure
is set.
Î Remove the hoses of the filling and flushing sta-
tion and screw the caps onto the fill and drain
valves.Manually start the solar thermal pump at
maximum speed (see controller manual) and let
11.
the fluid circulate for at least 15 minutes.
Î Bleed the solar thermal system several times.
%
Î Check the antifreeze ratio (not required if a ready -
mix is used).
5