Hisense AKT26UR4RK4 Use And Installation Instructions page 14

Sound from Deforming Parts
During system starting or stopping, an abrading sound might be heard. However, this is due to thermal
deformation of plastic parts. It is not abnormal.
Dew on Air Panel
When the cooling operation continues for a long period of time under high humidity conditions(higher
than 27℃/80%R.H.), dew can form on the air panel.
Refrigerant Flow Sound
While the system is being started or stopped, sound from the refrigerant flow may be heard.
5.Filter Removing and Installing
Removal method
Take out the air filter according to the following steps.
Step1: Slide until the 2 stoppers click into place as shown.
Step2: Open the front grille to an angle of more than 30° and take out the air filter from the front panel.
Installation method
Step1:Insert the filter to the panel and aim the bottom hooks. Pay attention to top hooks is locked .
Step2:Close the front grille and slide until the 2 stoppers click into place as shown.
step 1
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Operation manual
step 2