Revit Static Pressure Calculation - Cant test supply air system

[nfisher]

Hi All, 

Rather new to this, I created a simple system and wanted to see the pressure drop calculation. unfortunately it wont recognize my supply air system and I cannot figure out why. Any help would be appreciated. 

[iainsavage]

the supply connector on the air handling component needs to be set to Calculated rather than Preset. it will read its value from the connected duct which in turn obtains its value from the sum of the air terminal values.

[nfisher]

I really appreciate the time, and I have one further question - I cannot find where I change it from preset to calculated. Could you assist me on this?

[iainsavage · Accepted solution]

Select the equipment and click on edit family.

In the family select the suppku connector.

It is originally set as:

Change it to Calculated:

Reload into project.