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The recovered heat from the Chiller:Electric:EIR will be added to the attached heat recovery loop, and is a passive benefit. You can control the heat recovery chiller to only recover heat to meet the loop setpoint. You will need to connect the heat recovery loop to the main heating loop with either a WaterHeater:Mixed or a HeatExchanger:FluidtoFluid. I recommend the WaterHeater:Mixed so you don't have to worry about the approach temperature, if modeling a three-way valve.

Then I would use the PlantEquipmentOperation:OutdoorDryBulb to control whether WaterHeater:Mixed or Boiler:HotWater is staged on. It may be a bit tricky to get this to work properly. I've had to really tune the temperature setpoints of the loops to get this type of system to work properly.

If that control doesn't work than I would recommend using the EMS manager to stage the equipment. Look at the PlantEquipmentOperation:UserDefined object for this capability. The Application Guide for EMS is a good resource to get started with this type of control.