I think there is a mistake in the graphical interface OpenStudio when configuring the component Coil: Cooling: DX: singlespeed.
In the field Rated Evaporator Fan Power per Volume Flow Rate (see figure below), the unit is being shown in Pa. According to InputOutpurReference the EnergyPlus, should be W/(m³/s).
Perhaps this relationship translates into Pa, but I do not think so.