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4 Commissioning [specialist]
4.3
Flushing and filling
Observe the pressure relief valve
(6 bars)!
2020/08
1. Put the flush and fill station into operation
and flush the solar installation for at least
15 minutes.
2. Vent the solar system several times at the vent
plug of the Airstop [4.2] until the solar fluid exits
without bubbles (see page 13).
3. To flush and to vent the pump line, slowly open
the check valve in the return ball valve [1.2]
(45°, see page 12) and then close the flow
ball valve [5.2] (90°, see page 12).
4. Close the drain valve [3.2] while the filling pump
is running and increase the system pressure to
about 5 bars. The system pressure is displayed
on the pressure gauge.
5. Check the pressure gauge to see if the system
pressure decreases and eliminate leaks
if necessary.
6. Connect the expansion tank to the solar circuit
and set the operating pressure of the solar
system by means of the flush and fill station
(for the required operating pressure, see the
instructions of the expansion tank).
7. Reduce the pressure at the drain valve [3.2]
to the operating pressure of the installation,
if necessary.
8. Close the fill and drain valves [1.4|3.2].
9. Turn the check valve in the return ball valve
[1.2] into operating position (0°, see page 12).
997xx3xx-mub-en – V01
15
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