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How can I troubleshoot negative flow errors in my ApacheHVAC system?

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Negative flow errors occur during HVAC system sizing calculation and/or energy simulation. They are a result of a mismatch in airflows.

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Negative flow schematic 

The PDF link from this article discusses some of the most common causes that lead to negative flow errors in ApHVAC systems and the common troubleshooting tips for the same.