1. The installation height of the expansion tank should be at least 0.5m higher than the highest point of the system (usually 1.0~1.5m). When installing the water tank, the lower part should be used as a support. The length of the support should exceed the bottom plate by 100~200mm, and its height should be greater than 300mm. The support material can be square wood, reinforced concrete or brick. The outer wall between the water tanks should be considered for installation.

2. The piping on the expansion tank includes expansion pipe, signal pipe, overflow pipe, drain pipe and circulation pipe. The volume of the expansion tank from the signal pipe to the overflow pipe is the effective expansion volume.

3. Expansion pipe-in principle, it should be connected to the return pipe in front of the suction inlet of the circulating water pump, usually to the "water collector. Signal pipe-It should be connected to the wash basin in the refrigerator room, and a valve should be installed on the signal pipe.

4. Overflow pipe-When the volume of water in the system expands beyond the overflow pipe in the water tank, the water will automatically overflow. Do not install valves on overflow pipes.

5. Drain pipe-used when cleaning the water tank and emptying the water tank, a valve should be installed on the drain pipe.

6. Usually connect the overflow pipe and the drain pipe together and discharge them to the nearby sewer or roof.

7. Circulation pipe-set up in cold areas to prevent the water in the expansion tank from freezing. When there is no possibility of freezing in the water tank, no circulation pipe may be set. Especially in high-rise buildings, the expansion tank and the domestic water supply tank are usually located in the roof tank room, and the water tank is insulated, so there is no possibility of freezing.