4 Commissioning [specialist]
2017/05
99609x4x5-mub-en – V05
13
4.1
Preparations before flushing and filling
NOTICE
Note regarding the expansion tank
To prevent that the dirt particles in the solar thermal system are flushed into the expansion
tank, some manufacturers recommend to disconnect the expansion tank from the solar circuit
before flushing and filling. Please observe the instructions of the manufacturer.
4.2
Flushing and filling the secondary circuit
Depending on the application (charging of a storage tank/charging of a buffer tank), the
secondary circuit is filled by means of the valves at the tank or by means of the valves at the
heating system. Make sure that in the first case above only potable water must be used.
In the second case only treated heating water 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 commissioning the tank.
Secondary circuit
1.
Open the piston valves [C|D].
2.
Vent the secondary circuit by operating the fill
and drain valve [A].
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 fill and
drain valve [A] to eliminate air still present in the
heat exchanger.
