What precautions should be observed during the daily operation of self-priming pumps?
1. Prior to use, inspect all mounting bolts to ensure they are securely tightened. Examine the power cord and plug for any signs of damage, and verify that the motor’s insulation resistance exceeds 2 megohms.
2. To prevent electrical hazards, it is essential to install residual current circuit breakers (RCCBs) or other appropriate electric shock protection devices. Additionally, ensure that the pump is reliably grounded in accordance with safety standards.
3. The self-priming pump must operate within a voltage range of ±5% to -12% of the rated voltage. Operating outside this range may shorten the motor's service life or lead to motor failure. If the pump is located at a significant distance from the power source, use a sufficiently thick power cable to minimize voltage drop, which could otherwise impair performance.
4. After closing the power switch, allow the pump to run idle for approximately two minutes. During this time, confirm normal startup and operation, and verify that the rotational direction is correct.
5. Securely connect the pump body using a rigid steel pipe or a durable rubber hose—avoid excessively soft hoses that may collapse under suction. Attach the inlet piping and foot valve, ensuring the foot valve is installed vertically and positioned at least 30 cm above the bottom of the water source to avoid ingesting silt and debris.
6. Before initial operation, fill the pump’s water storage chamber completely with water. Subsequent startups do not require re-priming as long as the system remains sealed. If water is not discharged automatically within tens of seconds after powering on, check for air leaks or insufficient priming.
7. During operation, maintain dry conditions around the motor. Monitor water levels continuously to ensure the foot valve remains submerged. In environments where ambient temperature falls below 4 °C, implement anti-freezing measures to prevent ice formation that could cause cracking of the pump casing.
8. For extended periods of non-use, fully drain all residual water from the pump and water tank (especially for self-priming and automatic models). Clean key components thoroughly, apply rust-inhibiting oil, and store the unit in a clean, dry, and well-ventilated location to ensure readiness for future operation.