Guide: 1. Close the steam side valve and the drain valve, open the water side valve, and fill the water level gauge with water. 2. Close the water side valve and open the drain valve to drain the water level gauge. 3. Close the drain valve, open the water side valve, and fill the water level gauge with water.

　　★ Close the steam side valve and the drain valve, open the water side valve, and fill the water level gauge with water.

　　★ Close the water side valve and open the drain valve to drain the water level gauge.

　　★ Close the drain valve, open the water side valve, and fill the water level gauge with water.

　　★ Repeat the steps (2) and (3) above until the water level gauge is clear.

　　★ Close the sewage valve, open the steam side and water side valves, and resume the operation of the water level gauge.

　　★ Close the drain door to check and check the indications of the two water level gauges. They should be consistent and slightly shaken.