Friedrich Flexible Zone Concealed Ducted Heat Pump Indoor Unit with Precision Inverter® Technology, Fast Pro®, DiamonBlue Advanced Corrosion Protection®, Soft Start Technology, Dry Mode, 3 Fan Speeds, Auto Restart, and Auto Changeover: 18000 BTU Cooling : Service & Parts Manual (2019, 2020, 2021, 2022) : Page 229