Commissioning / Function Test / Decommissioning; Flushing And Filling The Solar Circuit - Cosmo WILO PARA STG 15/7-50 Montage- Und Betriebsanleitung

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8 C O M M I S S I O N I N G /
F U N C T I O N T E S T /
D E C O M M I S S I O N I N G
Please observe the following safety instructions regarding the commissioning of the station:
WARNING
Risk of burns and scalding!
The valves and fittings can heat up to more than 100 °C. It is therefore not
allowed to flush or fill the installation when the collectors are hot (solar radiati-
on). Please note that hot solar fluid leaks from the pressure relief valves in case
of too high system pressure! During venting, solar fluid may escape as vapour
and cause scalding!
Only flush and fill the installation if the collector temperatures are below
70 °C.
ATTENTION
Risk of frost!
It is often not possible to completely drain solar installations after flushing.
There is thus a risk of late frost damage when flushing with water. Flush and fill the
solar installation therefore only with the solar fluid used later.
Use a water and propylene glycol mixture with maximum 50% of propylene glycol
as solar fluid.
8 . 1 F L U S H I N G A N D F I L L I N G
T H E S O L A R C I R C U I T
The fill and drain valves necessary to flush and fill the installation are integrated in the solar
station.
To flush dirt particles out of the installation, only use flush and fill stations with fine filters.
Ball valve with integrated check valve
(Normal flow direction in the figure: downwards)
0°
Check valve is operating,
flow only in flow direction.
45°
Check valve is not operating,
flow in both directions.
3 5
90°
Ball valve closed,
no flow.