Installed an expansion valve a couple of weeks ago on a Carrier 10 ton RTU 410-A air handler and followed complete triple evacuation with nitrogen and new drier. Weighed in factory charge. Checked operation O.K.
Well a facilities worker noticed the sightglass indicated a possible moisture issue.
Unit is running great and has been since the installation. They now want me to remove the refrigerant, drier etc. and re-evacuate the system.
My question, knowing the sightglass is not always an accurate picture has anyone used any of the moisture removal products on the market and if you have what has been your experience.