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By default (if you have a single setpoint manager on the supply outlet node) OpenStudio will create a load based operation scheme. I think you might want to use a component setpoint operation scheme instead. To do this in OpenStudio simply drop setpoint managers on the immediate outlet nodes of the water heater components. OpenStudio will interpret this as you wanting to control those components to setpoint and will therefore use the component setpoint operation scheme when creating the idf file.

By default (if you have a single setpoint manager on the supply outlet node) OpenStudio will create a load based operation scheme. I think you might want to use a component setpoint operation scheme instead. To do this in OpenStudio simply drop setpoint managers on the immediate outlet nodes of the water heater components. OpenStudio will interpret this as you wanting to control those components to setpoint and will therefore use the component setpoint operation scheme when creating the idf file.

update

I have found a bug when you attempt component setpoint operation on a component directly upstream of the supply outlet node. The workaround is to insert a pipe between the setpoint component and the supply outlet node.

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