I am a homeowner who just had central air conditioning installed. During the installation I was watching as the refrigerant pipes were pressure tested following brazing and then evacuated with a vacuum pump. The techs did not use a micron gauge and assured me that the reading on their red/blue gauges indicated sufficient vacuum.
When I later mentioned this to the contractor contact who had quoted the system he was annoyed that the techs had not followed good practice and proposed that the system dryer/filter be replaced and the system then properly evacuated and recharged.
This seems like major (expensive) surgery to me, even though I would not see any cost.
I'm looking for some guidance here.
1/ Does a poor pumpdown raise enough concern to warrant this level of repair work to the system?
2/ If the freon charge is contaminated with residual moisture can this be detected by any other means and what might it do to the future reliability of the system?
3/ How seriously would you expect this job performance issue to be handled with the tech? Is it minor or job threatening?