E+ Equipment in Series on branch or equipment outside of splitter/mixer

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When you put equipment in Series on a single branch, is flow allowed even if one equipment isn't on? I'd tend to say yes, but I'd like confirmation.

Does it flows through the off equipment if it's "passive" or magically bypasses it (in the case of storage tank or HX:FluidToFluid in uncontrolled mode for example)?

What happens if you put the equipment for example on the supply side of the plant loop, but after the mixer (right before the supply outlet node for example)? And on the demand side, right before the demand outlet node? (I've had problems before when I've tried strange stuff like that).

Example cases:

• A Boiler:HotWater then a HeatExchanger:FluidToFluid
• A Chiller:Electric:EIR then a WaterHeater:Mixed connected to another Source Side loop
• A Chiller:Electric:EIR then a ThermalStorage:ChilledWater:Stratified (as in Plant application example 2)
• A HeatExchanger:FluidToFluid placed on the supply side right before the Supply outlet node
• A HeatExchanger:FluidToFluid placed on the demand side right before the Demand outlet node