Causes and troubleshooting of hot water circulation pump

The hot water circulation pump is a product of the centrifugal pump type. The temperature of the thermal circulation pump is used within 120 degrees, and the installation method is divided into two types: vertical and horizontal. The hot water circulation pump fault mainly has several faults such as no water, insufficient flow, noise vibration and water leakage. The following explains the various fault causes and solutions.

First, the hot water circulation pump failure does not produce water

1. The inlet and outlet valves of the hot water pump are not opened, the inlet and outlet pipes are blocked, and the aborted impeller is blocked. The solution is to remove the blockage.

2. The motor runs in the wrong direction. The motor phase loss is very slow: adjust the motor direction and strengthen the motor wiring.

3, hot water circulation pump suction pipe leakage: tighten the sealing surface to eliminate air.

4. The pump is not filled with liquid. There is air in the pump chamber: open the upper cover of the pump or open the exhaust valve to drain the air.

5, the import and export water supply is insufficient, the suction stroke is too high, the bottom valve leaks: stop inspection, adjustment (the phenomenon is easy to occur when the grid water pipe and the suction pipe are used).

6. The pipeline resistance is too large, and the centrifugal pump is not properly selected: reduce the pipeline bend and re-select the pump.

Second, the cause of insufficient heat pump fault flow

1. The inlet and outlet valves of the hot water circulation pump are not opened, the inlet and outlet pipes are blocked, and the aborted impeller is blocked. The solution is to remove the blockage.

2, pipe, hot water circulation pump runner impeller partially blocked, scale deposition, valve opening is insufficient: remove obstructions, readjust the valve opening.

3, the centrifugal pump voltage is low: voltage regulation.

4. Impeller wear: replace the impeller.

5. Exceeding the rated flow rate: Adjust the flow to close the small outlet valve.

6. Centrifugal pump suction is too high: reduce the suction stroke.

7, pump bearing wear: replace the bearing.

Third, the cause of the noise vibration of the hot water circulation pump

1. The pipeline support is unstable: stabilize the pipeline.

2. The liquid is mixed with gas: increase the suction pressure and exhaust.

3. Generate cavitation: reduce the degree of vacuum.

4. Bearing damage: Replace the bearing.

5, motor overload heating operation: adjust the flow to close the small outlet valve.

Fourth, the cause of hot water circulation pump failure motor heating

1. The flow of hot water circulation pump is too large, overload operation: shut off the small outlet valve

2, touch rub: check and exclude.

3, hot water circulation pump motor bearing damage: replace the bearing.

4, the voltage is insufficient: voltage regulation.

Five, the cause of leakage of hot water circulation pump failure

1. Mechanical seal wear of hot water circulation pump: replacement.

2. The pump body has sand holes or cracks: weld repair or replacement.

3. The sealing surface is not smooth: trimming.

4. The mounting bolts are loose: fastened.