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OK what is the model on the unit? Is this a gas furnace and coil installation or an electric air handler?
Thanks for this information. And sounds like it is in upflow position correct?
ake a look at the drawing below and tell me if he has at least a 4" from center of drain outlet to center of bottom of trap and then at least 2" back up as shown below.
Many installers are using a store bought tee that has a very slight trap
OK I feel most likely the problem is that your inspector does not understand the equipment manufacturer's guidelines.
You should have the main drain with both a trap and a cap installed.
You should not need the secondary drain when this coil is installed in a vertical (upflow)position.
This secondary connection must be plugged when installed in upflow position. See link below.You may need to show this to the inspector and have installer re install the trap and tee with cap as shown in first picture.
I am also providing you with a link to the manufacturers installation manual so you can show it to both installer and inspector.
If you have further questions, please let me know.
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