The condenser from the factory has enough refrigerant charge for a 15 ft long line set. In my case, my line set was a little under 15 ft so all they did was evacuate the system to a very high vaccume then released the freon into the system. The system came up after a whole bunch of diagnostics and after about a half hour, all the pressures stablized. No tweaks needed. I checked everything today using the pressures and other readings available via the thermostat and it all looks good. I believe if the pressures, subcooling, superheat, etc, are not right you will get an error notification on the thermostat.
The system is pretty amazing. And I got the 10 years labor and parts so nothing to worry about if anything fails during that time. In fact, the unit I got if the compressor or any of the refrigerant parts in the condenser fail during the first 10 years, Carrier gives you a whole new condenser vs repairing.
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