How to correctly simulate a VPF chilled water loop in energyplus?

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Hi everyone,

I'm trying to simulate a variable primary flow system in energyplus(v8.8.0). Here's the main components I implemented in the chilled water loop:

1. A LoadProfile:Plant object, the load schedule is based on real building data, the flow frac value is set to 1 throught out the year beacuse I don't have the real flow rate data.
2. A Pump:VariableSpeed object whose "VFD Control Type" is set to "PressureSetpointControl".
3. A Chiller:Electric:EIR object whose "Chiller Flow Mode" is set to "LeavingSetpointModulated".

I'm expecting that the flow rate in the pump could vary automatically in order to fit the load schedule. However, the water flow rate of the variable-speed pump is constant throughout the year unless I change the load profile flow frac schedule.

Therefore, I was wondering that is it necessary to use the real flow rate data in order to correctly simulate the VPF system? If not, what should I do?

Thank you.