ÎClose the filling valve (5).
OFF
ÎSwitch off the filling pump.
ÎCheck the manometer to see whether the system
pressure decreases (approx. 15 minutes) and elimi-
nate leaks where necessary.
ÎReconnect the expansion vessel to the solar ther-
mal system.
ÎOpen the filling valve (5) and switch on the filling
pump.
4.2 Flushing heating systems
ÎConnect the pressure hose of the flushing and fill-
ing station to the filling valve of the system.
ÎConnect the flushing hose of the flushing and filling
station to the drain valve of the system.
ÎOpen the ball valves of the filling and flushing station.
ÎOpen the filling valve and drain valve of the system.
ÎSwitch on the filling pump.
ÎFlush the system by means of the filling and flushing
station until the discharged solar fluid is free of gas
bubbles and dirt particles.
ÎSwitch off the filling pump.
ÎClose the filling valve and drain valve of the system.
ÎClose the ball valves of the filling and flushing station.
ÎDisconnect the pressure hose and the flushing
hose.
4.3 Cleaning the dirt filter
The dirt filter at the pump inlet must be checked for
grit at regular intervals. In order to remove and clean
the dirt filter, proceed as follows:
ÎDrain and open the tank.
The dirt filter is clearly visible at the bottom of the
tank.
ÎUnscrew and remove the dirt filter.
ÎClean the dirt filter thoroughly under running water.
ÎIf necessary, remove dirt particles from the bottom
of the tank with a soft cloth.
ÎReinstall the dirt filter.
dirt filter
ÎSet the operating pressure of the solar thermal
system (approx. 0.5 bar higher than the inlet pres-
sure of the expansion vessel or the value recom-
mended by the manufacturer).
ÎSwitch off the filling pump.
ÎClose the filling valve (5) and open the ball valve
(4).
ÎSlowly discharge the heat transfer fluid by means
of the drain valve (3) until the operating pressure
(see above) is set.
ÎRemove the hoses of the filling and flushing station
and screw the caps onto the fill and drain valves.
ÎEmpty the contents of the hoses into the tank of
the filling and flushing station by opening the ball
valves carefully.
ÎClose the ball valves.
ÎPut the non-return valves in flow and return in op-
erating position.
ÎManually start the solar thermal pump at maximum
speed (see controller manual) and let the fluid cir-
culate for at least 15 minutes.
ÎBleed the solar thermal system several times until
the discharged fluid is free of gas bubbles.
%
ÎCheck the antifreeze ratio.
GL
YCOL
ÎDrain the tank of the filling and flushing station.
Make sure the filter is completely immersed
in the medium in order to prevent air intake.
