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Waterside economizer integrated with more than one chiller

I have a situation were I have two chillers and a waterside economizer (HeatExchanger:FluidToFluid) served by a condenser plant loop with a couple of cooling towers.

Anyways, the sequence of operation says that if the WSE can supply to the chilled water loop then the chillers are off.

Initially I had started modeling only one chiller, and defined my heat exchanger to have a Control type of CoolingSetpointOnOffWithComponentOverride and therefore defined the Component Override Loop Supply Inlet Node to be the Chiller's chilled water inlet node and the Component Override Loop Demand Side Inlet Node to be the Chiller's condenser water inlet node. This worked as expected.

Now I'm trying to add the second chiller, and have them both turn off when needed. Problem is that I can't specify more than a pair of Component Override nodes.

How would you approach this problem?

Bonus point if I can stay in the OpenStudio ecosystem.

Waterside economizer integrated with more than one chiller

I have a situation were I have two chillers and a waterside economizer (HeatExchanger:FluidToFluid) served by a condenser plant loop with a couple of cooling towers.

Anyways, the sequence of operation says that if the WSE can supply to the chilled water loop then the chillers are off.

Initially I had started modeling only one chiller, and defined my heat exchanger to have a Control type of CoolingSetpointOnOffWithComponentOverride and therefore defined the Component Override Loop Supply Inlet Node to be the Chiller's chilled water inlet node and the Component Override Loop Demand Side Inlet Node to be the Chiller's condenser water inlet node. This worked as expected.

Now I'm trying to add the second chiller, and have them both turn off when needed. Problem is that I can't specify more than a pair of Component Override nodes.

How would you approach this problem? AvailabilityManagers? PlantEquipmentOperation?

Bonus point if I can stay in the OpenStudio ecosystem.