"Enter a value or a formula starting with "=". Airflow/CFM issue.

[whochleutnerXKP4B]

I am having issues with entering airflow type parameters in a project. I am trying to change the "Min. Cooling Airflow" type parameter from 750 CFM to 2000 CFM for a VAV box family. 

When I do this, I receive this error.

When I enter the 2000 number into the "Formula" column and click 'OK' or 'Apply", I receive this error. 

This only seems to be an issue when entering values for type parameters specific to airflow on this project. Does anybody have an idea of what could be the issue?

[bjlottis]

The latest updates to 2022, 2023 and 2024 fix this issue.

Help | 2024.3.1 Update | Autodesk

Here's a quote from 2024 Release Notes

Units

Fixed an issue in which for some models, duplicate unit symbols were shown for some units in the Project Units dialog and parameter values that used the duplicate units could not be modified.

[sragan]

Try just 2000.  Not 2000 CFM.