You have defined equipment in this building that requires a cooling tower. This could include water cooled chillers or in the case of a water source heat pump, a condenser water loop that requires a cooling tower. You are required to input a cooling tower and condenser water pumps.
Go to the Plant level of the Building Tree, and in the Chilled Water tab (for chillers) or in the Hydronic tab (for water source heat pumps), input the cooling tower and associated condenser water pumps for the HVAC system.
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