At the system level of the tree, you have input one or more HVAC systems with an identical name. The CEC CBECC engine uses the system name in the simulation and reports and requires that all systems in the building have a unique name.
Navigate to the System level of the Building Tree and edit the name shown. Note that you do not need to edit the name in the Central System library, that name does not have to be unique. Only the name shown in the Building Tree at the system level will need to be edited.
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