Fault reason and solution of hot water circulation pump
　　
1 hot water pump inlet and outlet valves are not open, out of the pipeline obstruction, abortion impeller blocked. Solution, remove obstruction.
　　
2. Motor running in the wrong direction, motor phase loss is very slow. Adjust the motor direction, sturdy motor wiring.
　　
3. Hot water circulation pump suction pipe leaks. Tighten the sealing surface, remove the air.
　　
4. The pump is not filled with liquid, there is air in the pump chamber. Open the pump cover or open the exhaust valve and drain the air.
　　
5. Inadequate import and export of water, suction stroke is too high, the valve leaks. Shutdown inspection, adjustment (water pipe and pipelines with suction easy to use this phenomenon).
　　
6. Pipeline resistance is too large, improper selection of centrifugal pumps. Reduce the pipe bend, re-select the pump
　　
Second, hot water circulation pump failure flow reasons
　　
1. Hot water circulation pump import and export valve is not open, out of the pipeline obstruction, abortion impeller blockage. Solution, remove obstruction.
　　
2. Pipeline, hot water circulation pump impeller impeller blockage, scale deposition, valve opening insufficient. Remove the obstruction and readjust the valve opening.
　　
Centrifugal pump voltage is low. Regulated
　　
Impeller wear. Replace the impeller.
　　
5 over the rated flow use. Regulate the flow off small outlet valve
　　
Centrifugal pump suction is too high. Lower suction.
　　
7. Pump bearing wear. Replace the bearing.
　　
Third, hot water circulation pump fault noise vibration reasons
　　
1. Pipe support unstable. Stabilize the pipeline.
　　
Liquid mixed with gas. Increase suction pressure exhaust.
　　
3. Cavitation generated. Reduce the degree of vacuum
　　
4 bearing damage. Replace the bearing.
　　
5. Motor overload heating operation. Regulate the flow off small outlet valve.
　　
Fourth, hot water circulation pump fault motor heating reasons
　　
1. Hot water circulation pump flow is too large, overloaded operation. Off small outlet valve
　　
Rubbing Check exclusion.
　　
3. Hot water circulation pump motor bearing damage. Replace the bearing.
　　
Insufficient voltage. Regulated.
　　
Five hot water circulation pump leakage reasons
　　
1. Hot water circulation pump mechanical seal wear. replace.
　　
2. The pump has sand holes or cracks. Welding repair or replacement.
　　
3. sealing surface is not flat. Trimming.
　　
4. Loose mounting bolts. Tighten.
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