I. internal crack or leakage of heat exchanger

Because the brazed plate heat exchanger is of welding type, it can not be repaired in this case and can only be replaced.

II. Leakage around the plate of heat exchanger

In this case, generally speaking, it is impossible to maintain, because the solder used for the heat exchanger is a low-temperature flux, and the high temperature generated by the maintenance welding will often melt the nearby solder, causing leakage in other places nearby.

III. leakage or crack at the nozzle

The situation is more optimistic than the second point, but the maintenance is still difficult.

IV. scale blockage of brazed plate heat exchanger

When the scale of heat exchanger is blocked, the weak acid solution (5% phosphoric acid or peroxide acid can be used) can be used for reverse flushing. In order to improve the flushing effect, the water pump can be used for pressurized flushing. The optimal flushing flow rate is 1.3-1.5 times of the original liquid flow rate. After acid cleaning, a large amount of clear water is required to wash the acid in the system.