26. Bleed the solar thermal system several times until
the discharged fluid is free of gas bubbles.
27. Check the antifreeze ratio.
28. Drain the tank of the filling and flushing station.
5.2
Flushing heating systems
Note
Adjust the operating pressure of system.
Note
Depending on the size of the system, the radiators can either be sepa-
rately opened and closed or all at once.
1.
Connect the pressure hose of the flushing and filling station to the filling valve
of the system.
2.
Connect the flushing hose of the flushing and filling station to the drain valve
of the system.
3.
Open the ball valves of the filling and flushing station.
4.
Open the filling valve and drain valve of the system.
5.
Switch on the filling pump.
6.
Flush the system by means of the filling and flushing station until the dischar-
ged solar fluid is free of gas bubbles and dirt particles.
7.
Switch off the filling pump.
8.
Close the filling valve and drain valve of the system.
9.
Close the ball valves of the filling and flushing station.
18
11.
%
10. Disconnect the pressure hose and the flushing hose.
6
Maintenance
6.1
Cleaning the dirt filter
The dirt filter at the pump intake must be checked for grit at regular intervals. In
order to remove and clean the dirt filter, proceed as follows:
1.
Drain and open the tank.
The dirt filter is clearly visible at the bottom of the tank.
2.
Unscrew and remove the dirt filter.
3.
Clean the dirt filter thoroughly under running water.
4.
If necessary, remove dirt particles from the bottom of the tank with a soft
cloth.
5.
Reinstall the dirt filter.
Note
Make sure the fluid is always above the MIN mark in order to prevent
air intake.
dirt filter