1、 Preparation before installation

1. environment check
   • Ensure that the usage environment meets the requirements: clean water quality (avoiding large amounts of sediment and corrosive substances), water temperature not exceeding 40 ℃, and water depth not exceeding the rated value (usually 5-10 meters).
   • Check if the power supply voltage is consistent with the rated voltage of the motor (such as 220V), and the voltage fluctuation range should not exceed ± 10%.
   • Confirm that the length of the power cord is sufficient and the wire diameter meets the load requirements (to avoid motor overheating due to voltage drop).
2. Pump body inspection
   • Check whether the pump body, cables, and seals are intact, without damage or cracks.
   • Manually rotate the impeller and confirm that it rotates smoothly without any jamming or abnormal noise.
   • Clean the debris inside the pump to prevent blockage or damage to the impeller during operation.

2、 Installation and fixation

1. Vertical suspension installation
   • Submersible pumps should be suspended vertically in the water, avoiding tilting or lying flat, to prevent water from entering the motor or uneven wear of the impeller.
   • Use specialized ropes or brackets to secure the pump body, ensuring stability and ease of lifting and maintenance.
2. cable protection
   • The cable needs to be fixed with specialized clamps or brackets to avoid damage caused by friction with the wellbore and pipelines.
   • The cable joint needs to be wrapped with waterproof tape and immersed in water to test for water leakage.
   • Power lines should be laid overhead or underground to avoid mechanical damage or electric shock risks.
3. water level control
   • The submersible pump needs to be immersed in water for operation, and the low water level should be at least 30cm above the top of the pump body to prevent the motor from burning out due to idling.
   • If used for draining water tanks, a float switch or liquid level controller must be equipped with automatic shutdown protection.

3、 Operation precautions

1. Start and Stop
   • Ensure that the outlet valve is closed before starting, and gradually open the valve after the motor is running normally to avoid excessive starting current.
   • When shutting down, first close the outlet valve and then cut off the power to prevent water hammer impact from damaging the pump body.
2. Load monitoring
   • Avoid long-term overload operation and observe whether the ammeter reading exceeds the rated value (usually within 1.1 times the rated current of the motor).
   • If excessive current, abnormal vibration or increased noise is found, stop the machine immediately for inspection.
3. Prevent idling
   • Submersible pumps are strictly prohibited from idling (running without water), otherwise it may cause the motor to overheat, seal failure, or even burn out.
   • If the machine needs to be shut down due to a decrease in water level, wait for the water level to rise before restarting.

4、 Maintenance and upkeep

1. regular inspection
   • Check cables, seals, and fasteners every 50-100 hours of operation, and replace aging or damaged parts.
   • Clean the surface sediment of the pump body to prevent blockage of the heat dissipation holes or entry into the pump.
2. Lubrication and replacement
   • Mechanical seals need to be replaced regularly (usually every 2000-3000 hours of operation) to prevent leakage.
   • The bearing grease needs to be replenished or replaced according to the instructions (such as every 1000 hours of operation).
3. Winter freeze protection
   • When the pump is not in use for a long time, it is necessary to lift the pump body out of the water surface, drain the accumulated water inside, and prevent freezing and cracking.
   • Store in a dry and ventilated place to avoid a damp environment that may cause insulation degradation of the motor.

5、 Security protection

1. grounding protection
   • Submersible pumps must be reliably grounded with a grounding resistance of ≤ 4 Ω to prevent electric leakage and shock.
   • Use a leakage protector (rated operating current ≤ 30mA, operating time ≤ 0.1s).
2. Operating Specifications
   • It is strictly prohibited to lift or inspect the pump body with electricity. The power must be cut off and warning signs must be hung.
   • Avoid using ordinary submersible pumps in flammable and explosive environments, and choose explosion-proof models.
3. Child and pet protection
   • Fences or warning signs should be set up in the installation area to prevent children or pets from approaching.

6、 Common fault handling