en
5
Before flushing the system
Î
Disconnect the expansion vessel from the solar
thermal system.
2.
Î
Connect the pressure hose of the filling and flush-
ing station to the fill valve (5) of the pump station.
Î
Connect the flushing hose of the filling and flush-
ing station to the drain valve (3) of the pump sta-
tion.
Î
Close the ball valve of the pump station (4).
Î
Open the fill valve (5) and the drain valve (3).
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
bubbles and dirt particles.
Î
During flushing, bleed the solar thermal system
several times until the discharged solar fluid (e. g.
Tyfocor
®
, see chap. 11) is free of air bubbles.
Î
Open the ball valve of the pump station (4).
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.
BAR
Î
Increase system pressure (approx. 3.5 - 4 bar). The
system pressure can be read from the pressure
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
the fluid circulate for at least 15 minutes.
Î
Bleed the solar thermal system several times.
Î
Check the system pressure at the pressure gauge.
11.
%
Î
Check the antifreeze ratio (not required if a
ready-mix is used).
4
Ball valve positions
WARNING!
Scald danger! Damage by
overpressure!
When the ball valve is closed, too
high pressure may occur in the
blocked-off line if it is heated.
Î
In order to prevent scald
danger and damage by
overpressure, make sure
the blocked-off line is not
heated.
Non-return valve in operating
position, fluid flow in flow direc-
tion only.
Ball valve open, fluid flow in both
directions possible.
Ball valve closed, no fluid flow.
5
Draining the system
Î
Open the ball valve (4).
Î
Open the air vent at the highest point of the sys-
tem (above the collectors).
Î
Open the drain valve.
6
Non-return valves
The non-return valves of the pump station are inte-
grated into the ball valves in flow and return and have
an opening pressure of 20 mbar.
In order to completely drain the system, the non-
return valves have to be opened.
Î
For this purpose, turn the handles of the ball
valves by 45°.
Î
For normal system operation, open the ball valves
completely.
