Sunlight Supply Samsung Programmable Thermostat for Split Systems - Manual (Page 122)

Opening the panel
Tightly grab top of the front panel and pull it down to open.
Then slightly lift the panel up.
and slide it down.
Open the panel and put the Air filter out.
Insert the Air filter back in its original position
and close the front panel. Dry the Air filter in a ventilated area.
Clean the Air filter with a vacuum cleaner or soft brush.
If dust is too heavy, rinse it with running water.
on the usage and environmental conditions. In dusty area, clean it once a week.
Power
well-ventilated area.