A year or so ago, my son replaced his a/c in his condo. The lineset was burried, so the original was used. No problem as the replacement unit was an R22 unit.
About a 6" from the plenum, was brazed on a piece of new tubing connected to the liquid line, which terminated with a flared fitting and was connected to the coil.
There was no filter/drier installed, which I don't really have a problem with. My reasoning is as follows: The joint looked pretty clean, with a uniform dark coating along the joint. I wasn't there to note whether nitrogen purge was used. My assumption is that when a drier is brazed in place, there is one connection on the downstream side and therefore there is the potential that a poorly brazed joint could produce particles beyond the reach of the filter.
My only experience with f/d's involved brazed connections. Are there ones with flared fittings?
Is my reasoning correct?
P.S., the year before, the furnace was replaced. Both units are major brands (admittedly, not the top of the line), and the installation looks pretty good to me. The contractor is one of the largest dealers for a major brand in the Philly/So. Jersey market.