When doing a simulation with the EnergyPlus based CBECC engine, the software generally expects that the airflow rate on the cooling system be within a certain range. The valid range for a successful simulation is going to be a cooling system that has a cfm airflow to tonnage ratio between 300 and 450 cfm per ton.
Review the Cooling output of the system and the airflow rate of the system for conformance with this rule in the Central System library. Either change the cooling output (tonnage) or the airflow rate (CFM) to ensure the system falls within this range should the simulation fail to run.
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