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Filling quantity
Calculation and determination of the filling quantity of the installation
The filling quantity depends on the components used in the installation The respective values for collector content,
heat exchanger content and content of the installed piping is provided in the technical documentation of the individual
components.
The filling quantity is the total content of the installation when it is completely filled and the air is drained.
The filling quantity of the installation is determined as follows:
Filling quantity = content of collectors + content of all pipes + content of heat exchanger + content of drain set
The collector content according to the technical datasheet of the installed collectors.
Content of pipes according to installed lenght of pipes and cross section see " Fluid contents / Volumes " on page 8.
The content of the heat exchanger (external/internal) is provided in the technical documentation of the heat exchanger or respect-
ively the storage.
The content of the drain set is 40 liters.
Should additional system components that influence the filling quantity of the installation be installed, they have to be taken into
account for calculation and determination of the filling quantity.
Be sure that during the filling of the installation, the mix of glycol and water is filled at room temperature
(15 °C - 25 °C ).
Expansion volume
Determine the the expansion volume of the installation
The expansion volume of the solar fluid with temperature increase has to be taken into account.
Depending on the total volume of the photovoltaic system, an expansion volume has to be drained. The respective value can be
found in the tablesee " Expansion Volume " on page 8.
Drain volume
Calculation and determination of the drain volume of the installation
The drain volume depends on the components used in the installation. The respective values for collector content,
heat exchanger content and content of the installed piping is provided in the
technical documentation of the individual components.
The drain value of the installation is determined as follows:
drain value = collector content + content of all collection and connection pipes + expansion volume
The collector content according to the technical datasheet of the installed collectors
Depending on the collector field installation, collection and connection pipes are installed. The content of these pipes is provided
in the technical documentation of the manufacturer of the collectors.
Installation content
Calculate the installation content of the installation
In order to avoid negative pressure in the installation, it is advised to run the system
with a pressure of ca. 0.5 bar (above installation pressure due to static height).
If you want to adjust the pressure increase of the installation via the filling station, determine the installation content as follows:
installation content = filling quantity - drain volume
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