Update for anyone who finds this post.

I think this was the wrong thermostat for this type of AC. I went out and got an Ecobee to attach to the unit and it’s working great! I did have to call Ecobee to find that I had to change the O/B setting from its default but it’s working like a charm now!

I have no idea why I didn’t think to read the thermostat manual. I have read this PTAC manual so many times trying to figure this out.

I’ll give this a shot! Thanks man!

Your vacuum might have an attachment you can buy that is like a little handheld vacuum with bristles.

Something like this

gravity-centered airflow

What do you mean by this? I’ve never heard that term before