Model parallel pumps to operate staged Heat Pumps

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Hi, I am trying to use E+ to model two heat pumps which have staged operation. i.e. if one heat pump can't meet the demand load, then the other kicks on. Because of this operating scheme, each heat pump has its own pump. How do I model this? I am getting hung up on the branches and associated splitter/mixer connections since the pumps are being modeled on the demand side.