How to open the heating valve

1. As shown in the figure, the upper water pipe is the water inlet pipe and the lower water pipe is return pipe. Close the lower return pipe before using the start valve.

2. Turn the return pipe valve counterclockwise to the end to close the return pipe.

3. As shown by the red circle in the figure, this is the bleeder valve.

4. Then unscrew the air valve.

5. After opening the air valve, the valve will make a "squeaky" deflation sound. When the hissing sound disappears, it means that the water has been drained. At this point, close the drain valve first.

6. Then close the bleeder valve clockwise and open the return pipe, and it is finished.