Don't want to blame the Tech but he should have questioned the installation.
Contracted out a ducted central, unit is 60,000 btu but won't cool. I check subcooling and determine unit is undercharged so I evacuate and recharge by weight.
Suction is so high I decide compressor must have a broken suction valve. I arrange for a new compressor and pull the old one.
This is Great!
Result: The 1 1/8" (27 mm) suction port on this sealed compressor was dented in leaving aprox. a 3/8" (10 mm) opening, but the factory brazing machine sealed the lip of the 1 1/8" (27mm) copper tube below the dent so you couldn't see it.
I used the new compressor and sent the original back to the factory