How to get the air of the heater

The heater air is removed by loosening the cube -shaped screw head on the piece called Purjör (element in the picture) in the upper left or upper left corner of the heater. This screw is actually a discharge valve and opens by either with a unique switch (cigar switch), or with a flat screwdriver. When the valve is loosened, the pressure air comes first for a while, and this process must continue until only water is flowing from the cigar. When the air of all radiators in the house is taken, there is a decrease in system pressure. Check the system pressure and increase it if it is low for the system to work healthy. (Between 1,5 - 2 bar)