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I'm guessing that the fan needs to cycle on and off with coil. Your options to support that are to use one of the zone HVAC systems (like PTAC) or use an AirLoopHVAC based system with a AirLoopHVACUnitary component inside of it to manage the cycling. OpenStudio does not support reconfiguring zone equipment graphically in the application, therefore you cannot graphically replace the water coil with an electric heating coil. Certainly this is possible with a measure but I'm going to assume that you would rather use the UI. So go the AirLoopHVAC route following these steps to build up a system from components.

Create a new empty AirLoopHVAC system.

Add an oa system.

Add an AirLoopHVACUnitarySystem. You want the one with DX cooling, cycling, and electric "reheat", which will really just be heat in this case.

Attach your zone.

Add an uncontrolled terminal.

Edit the unitary system and make sure that the attached zone is specified as the Controlling Zone.