Workstation displays power in Btu/s when VA is required.
EcoStruxure Building Operation
The units displayed in Workstation are based on the Regional and Language Options settings in Windows Control Panel as talked about in Metric vs. English (Imperial) Operating System.
The Unit Conversion Exception tool can be used as a solution for this issue. This is located in the Domain portion of Workstation's Control Panel. For more information on the Unit Conversion Exception see Unit Conversion Exceptions feature or the Online help located here.
In the situation where VA has been set as the power unit but Btu/s is still displayed, the unit conversion shown below will resolve the issue. Note: If your desired value units have a prefix, then this needs to be done in the Unit Conversion Exception as well (kVA).
Note: WebStation (as of v1.3 SP1) does not use the Windows OS setting because the AS does not currently have localization - it uses only the International System of Units (SI) - not the Imperial or US units.