Install Instructions

9
0° 45° 90°
Check valve in operation,
flow-through only in flow
direction
Check valve not operating,
flow-through in both directions
Ball valve closed,
no flow-through
6. Open the fill and drain ball valves (3 and 5).
7. Flush the solar thermal system using the flushing and filling station for at least 15 minutes to
remove all air from the system.
8. During flushing, bleed the solar thermal system several times at the Air vent (6) until the
discharged solar fluid is free of air bubbles.
9. Close the drain ball valve (3) of the flushing and filling unit with the filling pump running and
increase the system pressure to approx. 70 psi (5 bars). The system pressure can be read
from the gauge.
10. Close the fill ball valve (5) and switch off the pump of the flushing and filling station.
11. Check the gauge to see whether the system pressure reduces and eliminate leaks where
necessary.