I had a Comfort-Aire 9,000 BTU unit installed by my HVAC contractor who services my Central unit. The unit came pre-charged for a 25-foot line set and I needed to add an additional 15 feet of line.
The Mini-Split was working great but now I noticed upon start-up the compressor would groan & vibrate but not start the compressor cycle. This would happen 2 or 3 times then the compressor would finally kick in and cold air would blow. I spoke with Comfort-Aire Tech support and he believes the system is overcharged. When I reviewed the bill, it included 4.5 lbs of Freon when the Tech said he should have only added 2 or 3 ounces. The Tech recommended that the unit be evacuated and the charge weighed to see how much was installed. When I spoke with my HVAC guy he said they do not use scales just gauges. Is he blowing smoke? Should I have this guy come back? What kind of damage has been done by running the unit overcharged for 2 3 months? How can I test the compressor to see what damage was caused. Any suggestions would be appreciated.