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I do not see any rating conditions used for sizing these objects. The capacity of this object is calculated based on the delta T inputs in the Sizing:Plant objects. The DesVolFlowRate is the sum of the demand side loads on the plant (e.g., sum of water coil water flow rates).

tmpLoadVolFlow = PlantSizData(pltLoadSizNum).DesVolFlowRate * this->sizingFactor;
tmpCapacity = Cp * rho * PlantSizData(pltLoadSizNum).DeltaT * tmpLoadVolFlow;

Sizing:Plant,
  Chilled Water Loop,      !- Plant or Condenser Loop Name
  cooling,                 !- Loop Type
  7.00,                    !- Design Loop Exit Temperature {C}
  4.00;                    !- Loop Design Temperature Difference {deltaC}

Sizing:Plant,
  Hot Water Loop,          !- Plant or Condenser Loop Name
  heating,                 !- Loop Type
  82.,                     !- Design Loop Exit Temperature {C}
  11;                      !- Loop Design Temperature Difference {deltaC}

I do not see any rating conditions used for sizing these objects. The capacity of this object is calculated based on the delta T inputs in the Sizing:Plant objects. The DesVolFlowRate is the sum of the demand side loads on the plant (e.g., sum of water coil water flow rates).rates). Cp and rho are based on the loop exit temperatures.

tmpLoadVolFlow = PlantSizData(pltLoadSizNum).DesVolFlowRate * this->sizingFactor;
tmpCapacity = Cp * rho * PlantSizData(pltLoadSizNum).DeltaT * tmpLoadVolFlow;

Sizing:Plant,
  Chilled Water Loop,      !- Plant or Condenser Loop Name
  cooling,                 !- Loop Type
  7.00,                    !- Design Loop Exit Temperature {C}
  4.00;                    !- Loop Design Temperature Difference {deltaC}

Sizing:Plant,
  Hot Water Loop,          !- Plant or Condenser Loop Name
  heating,                 !- Loop Type
  82.,                     !- Design Loop Exit Temperature {C}
  11;                      !- Loop Design Temperature Difference {deltaC}