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Make sure that the Building structure is set to project level so that the Settings area is available to the right of the Schema area.
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Click Settings.
The project level Settings opens.

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In the Material section, click on Settings....
The Settings dialog opens.

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Make sure that your desired calculation method is selected in the upper drop-down list and adjust the building type via the second drop-down list if necessary.
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If necessary, adjust the comfort level under Global Usage.
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Check the Potable Water Temperature (PWC) and the Ambient Temperatures (Global) and adjust the values if necessary.
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Specify which of the checkbox options should be taken into account in the pipe network calculation.
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Switch to the Dimensioning tab and adjust the limits for dimensioning in the left area if needed.
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In the right area of the Dimensioning tab, check the maximum speeds for different pipe types and adjust the values if needed.
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Set the desired checkbox options for dimensioning in the lower area and close the dialog with OK.
You have configured the settings for the pipe network calculation of a scheme.