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5
Beforeushingthesystem
ÎDisconnect the expansion vessel from the solar thermal system.
ÎConnect the pressure hose of the lling and ushing
station to the ll valve (5) of the pump station.
ÎConnect the ushing hose of the lling and ushing
station to the drain valve (3) of the pump station.
ÎClose the ball valve of the pump station (4).
ÎOpen the ll valve (5) and the drain valve (3).
ÎSwitch on the lling pump of the lling and ushing
station.
ÎFlush the solar thermal system for at least 15 minutes by means of the lling
and ushing station until the discharged solar uid is free of gas bubbles and
dirt particles.
ÎDuring ushing, bleed the solar thermal system several times until the dis-
charged solar uid (e. g. Tyfocor®, see chap. 11) is free of air bubbles.
ÎOpen the ball valve of the pump station (4).
Afterushingthesystem
ÎConnect the expansion vessel to the solar thermal system
ÎClose the drain valve (3) of the pump station while the lling pump is running.
ÎIncrease system pressure (approx. 3.5 - 4 bar). The
system pressure can be read from the pressure gauge.
ÎClose the ll valve (5).
ÎSwitch off the lling pump.
BAR
ÎCheck the pressure gauge to see whether the system pressure reduces and
eliminate leaks where necessary.
ÎSlowly discharge the heat transfer uid by means of the drain valve (3) until
the operating pressure is set.
ÎRemove the hoses of the lling and ushing station and screw the caps onto
the ll and drain valves. Manually start the solar thermal pump at maximum
speed (see controller manual) and let the uid circulate for at least 15 minutes.
ÎBleed the solar thermal system several times.
ÎCheck the system pressure at the pressure gauge.
ÎCheck 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.
ÎIn order to prevent scald danger and damage by over-
pressure,make sure the blocked-off line is not heated.
Non-return valve in operating position, uid ow in ow
direction only
Ball valve open, uid ow in both directions possible
Ball valve closed, no uid ow
5 Draining the system
ÎOpen the ball valve (4).
ÎOpen the air vent at the highest point of the system (above the collectors).
ÎOpen the drain valve.
6 Non-return valves
The non-return valves of the pump station are integrated into the ball valves in
ow 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.
ÎFor this purpose, turn the handles of the ball valves by 45°.
ÎFor normal system operation, open the ball valves completely.
7 Flowmeter