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5724 267 v1.0
Flushing the heat exchanger
Start-up
1. Disconnect the expansion tank from the solar system
and temporarily plug expansion tank pipe connection.
This avoids that the dirt particles in the pipes are
washed into the expansion tank.
2. Put the check valve temporarily out of operation by
turning the solar supply ball valve (a) to position 45°
(see page 13).
3. Close the solar return ball valve (b) (position 90°).
4. Connect the flush and fill station
- pressure hose to the fill valve (d)
- flush hose to the drain valve (c)
5. Open the fill and drain valves (d) (c) and put the flush
and fill charge station into operation.
6. Slowly open the return ball valve (b) during flushing
in order to vent the pump section.
7. Flush the solar installation until the solar fluid exits
without bubbles or debris.
8. Close the drain valve (c) with the filling pump running
and increase the system pressure to about
72 psi / 5 bars. The system pressure can be read on
the pressure gauge.
9. Close the fill valve (d) and switch off the pump of the
flush and fill station.
10. Check the pressure gauge to see whether the system
pressure reduces and eliminate leaks where necessary.
11. Reduce the pressure on the drain valve (c) to the
final fill pressure.
12. Connect the expansion tank to connection (e) and set
the final fill pressure of the solar system using the flush
and fill station.
Refer to the Vitosol Start-up, Service and
Operating Instructions for recommended
expansion tank cold fill and system final
fill pressures.
Fig. 12 Primary solar loop components
a
b
c
d
e
