ELECTOR SA-2020pro Manuel De L'utilisateur page 27

SA-2020pro
Flushing the heating system
1. Shut down the circulation pumps.
2. Close all heating circuits.
3. Start with a rinse of the main flow and main return.
4. If you do not have any suitable flushing valves that allow you to connect the flushing device to
the flow and return, you can dismantle the circulation pump and attach the flushing device's
hoses to the pipe sections.
5. Install a pressure reducer on the water inlet of the flushing device. This should be set to around
0.5 - 5 bar. Connect the water supply to the drinking water line or a storage tank with a feed
pump. Depending on the requirements for the later heating water quality, a water filter system for
full desalination or softening can be installed in the inlet of the flushing device. In this way, the
system is filled directly with the correct water quality for later operation.
6. Connect the flushing device to the heating flow and return, as well as to a suitable waste water
supply.
7. Connect an air compressor. The compressed air should always be 1 bar above the water
pressure, but no more than 6 bar.
8. To flush the main supply and return lines, open the distributor furthest away and only the heating
circuit that is furthest away from it in terms of flow.
9. Measure the electrical conductivity and the pH value of the drinking water or the rinsing water.
10. Open the water supply and let the water run in at low pressure.
11. Set the interval time on the compressed air control and start the compressed air program.
12. Run the water and watch the pressure gauges. As soon as a pressure gauge rises, there is a
risk of compression. In this case, the rinsing direction should be changed via the valve position.
Switching back and forth prevents the impurities from being pushed together. These are pulled
apart while rocking and finally flushed out of the system.
13. As soon as the compressed air bubbles come out of the drain of the flushing device, you know
that you have flushed through the pipe once.
14. During longer flushing processes, compressed air can always be fed into the system in bursts
via the Air + program. This dissolves impurities better and can simply be rinsed out.
15. Before the end of the flushing process, let water run in for a long time without compressed air so
that there are no more air cushions in the heating circuit.
16. Rinse with the procedure described above until the water runs through the pipe without
resistance, clean water comes out of the system and the pH value and the electrical conductivity
of the outflowing water match the incoming water.
17. When the heating circuit in question has been cleaned, lock it off and open the next heating
circuit.
18. After flushing the most distant heating circuit via the main flow and main return, the flushing
device can be connected directly to the individual heating circuit distributors and flushed there.
This is often easier. Of course, the heating can also be completely flushed via the main flow and
main return.
19. All heating circuits can only be reopened when the system has been purged separately, part by
part. The separate flushing of the system parts prevents impurities from being shifted from one
heating circuit to the next.
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