It's only a sealed system because the factory didn't install taps on the system so refrigerant pressure readings can be taken. Last year after taking delivery of ours the bedroom A/C wasn't working properly. I could find a leak on the unit and had read the units were coming from the China plant under charged. I installed access valves and weighed in a factory charge of 18 oz. R410a. My bedroom Unit operating properly now and didn't have another issue all summer. Yes it was under warranty but didn't want to hassle with the dealer so I just fixed it myself.
2014 Palomino Columbus 3650TH
435AH 12V VMax Charge Tanks, 520 watt Monocrystilline Solar Array, Morningstar MPPT TS-60 CC,Morningstar Remote,Cotek True Sine Wave Inverter,Cotek Remote Controller,50amp Progressive Hardwire Surge Protector
2015 Dodge 3500 6.7L 4X4
2011 CanAm Commander XT 1000