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4 Commissioning [specialist]
4.1
Flushing and filling the secondary circuit
NOTICE
Note regarding the expansion tank
To prevent that dirt particles of the solar system are washed into the expansion tank, some
manufacturers recommend to disconnect the expansion tank from the solar circuit during
flushing and filling. Please observe the instructions of the manufacturer on this topic.
Depending on the application, the secondary circuit is filled (charging of a domestic hot water
tank) via the valves at the tank or (charging of a buffer tank) via the valves of the heating
system. Make sure that only potable water must be used in the first case mentioned. In the
second case mentioned, only heating water treated according to VDI 2035 / Ö-Norm H5195-1
must be used.
To avoid that dirt particles are washed into the heat exchanger, shut the ball valves of the
module and wash out the present dirt particles/scale residues before the initial commissioning
of the tank.
Domestic hot water circuit
2016/05
1. Open the piston valves [C|D].
2. Vent the secondary circuit by operating the
pressure relief valve [A] on the secondary side.
Make sure that the electrical components do
not get wet.
3. Fill the secondary circuit by means of the
valves at the domestic hot water tank or
at the heating system.
4. During operation, vent the station at the
pressure relief valve [A] to eliminate the
air still present in the heat exchanger.
996091425-mub-en – V04
13
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