Haier 3U55S2SR3FA Manual De Instalación página 28

5. Refilling the refrigerant
Precautions when adding R32
Fill from the liquid pipe in liquid form.(recommend)
6. Charging with refrigerant
7.Precautions for Laying Refrigerant Piping
Cautions on pipe handling
Selection of copper and heat insulation materials
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5U90S2SS3FA
5U105S2SS3FA