I had a 2 1/2 ton new r-22 outside air unit installed today while I was at work. My father was there with them. They messed around for jhours trying to get it right. A couple hours after they left they called me at work and told me they didn't know it came charged with dry nitrogen and hadn't evacuated it before filling with r22 . They would be back in a hour to fix it. I got home before they got they to discover ther unit had never came close to reaching the house temperature to shut off in the 4 hours since it was started . I shut it down. After coming back and evacuating and refilling with r22 the unit seems to be working alright. Was it damaged by running it with dry nitrogen and r22 ? What should I do about it.