en
5
Before flushing the system
Î
Disconnect the expansion vessel from the solar thermal system.
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.
2.
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 flushing
station.
Î
Flush the solar thermal system for at least 15 minutes by means of the filling
and flushing station until the discharged solar fluid is free of gas bubbles and
dirt particles.
Î
During flushing, vent the solar thermal system several times until the dis-
charged 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 thermal system.
Î
Close the drain valve (3) of the pump station while the filling pump is running.
Î
Increase the 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.
BAR
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 station 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
Vent the solar thermal system several times.
Î
Check the system pressure at the pressure gauge.
Î
Check the antifreeze ratio (not required if a ready-
mix is used).
11.
%
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.
Ball valve in operating position, fluid flow in flow direction
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 system (above the collectors).
Î
Open the drain valve (5).
6
Non-return valves
The non-return valves of the pump station are integrated 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.
