5). Fix the outlet pipe securely in order to prevent water from splashing the motor that may lead to electric
leakage.
6). Set brackets to support the intake pipe and outlet pipe and these pipes shall not depend solely on the
pump body for support.
7). If user wants to change the electric pump into automatic control mode, the proper pressure control
device shall be fitted on the outlet pipe.
8). On use of electric pump, neither place it horizontally in water nor put it submerged in water in
order to prevent the motor from rain or spraying, nor shall it be sprayed by a powerful jet of water
in order to avoid destroying winding insulation due to moisture by motor.
9). Creepage protection device shall be installed correctly and ensure it is reliably grounded at the
position of grounding mark of the electric pump or of the cable (except for electric pump equipped
with three-pin plug ). Meanwhile, the power socket should also be reliably grounded. If the
three-phase electric pump needs equip with overload protection device, it is necessary to choose the
matched one according to the current or power.
Wiring Diagram of Protection Device
10). For peripheral pumps, they should not reach the maximum head when in use to avoid overload.
11). For centrifugal impeller pumps, they should be used in range of the prescribed head (except for
electric pump with full head coverage) to prevent them from damage due to overload.
12). Check the water level to see whether it is lowering and do not allow to let the foot valve or the lower
end of intake pipe out of water.
13). During the operation, if user wants to adjust the electric pump position or touch it, firstly cut off
the power supply to avoid accident.
14). In order to avoid accidents, swimming, washing, herding nearby the
working space of electric
pump are forbidden.
4. MAINTENANCE
1). Regularly check the insulation resistance between the electric pump winding and motor casing. The
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cold insulation resistance
shall not be lower than 50MΩ. Otherwise, corresponding measures shall be
taken. The electric pump could not be reused until it meets the operation requirement.
2). The maintenance job should be taken according to the next steps:
Dismantlement: Check various vulnerable components including roller bearings, mechanical seal, impeller,
foot valve, etc. Replace them timely if damage is found.
Air tightness test: Conduct hydraulic (or pneumatic) pressure test for components used to pass flow
through their passages according to maximum hydraulic (or pneumatic) actuating pressure after
disassembling pump for repair or replacing various airtight packing. The test should last for 5 minutes. If
no leakage or sweat occur during the time, pass the test.
3). Drain off residual water inside pump when ambient temperature is lower than 4
℃
to avoid crack
occurrence for pump body due to frost.
4). If the electric pump is to remain unused for a long period of time, firstly disassemble the pipeline and
drain off the residual water, then rinse the main components for rust-proof treatment, finally, keep it in the
dry and well-ventilated place and store it properly.
5. ILLUSTRATIONS ON INSTALLATION AND MAINTENANCE
1).Figure. A: The electric pumps must be installed in a dry well-ventilated place with an ambient
temperature of no more than 40
℃
. Fix the pump in place on a solid flat surface using suitable bolts to
avoid vibration.
2).Figure. B: The intake pipe must be slightly angled up towards the intake mouth to avoid the formation
of air locks.
3).Figure. C: The pipes must always be fitted using the related brackets to avoid transmitting stress to the
pump body.
4).Figure. D: The specifications on the electric pump name plate and rated line values are the same.
5).Figure. E: Check that three-phase electric pumps rotate clockwise when looking at the pump from
motor fan side, swapping over two of the phase connections if they do not.
6).Figure. F: Fill the electric pump completely with clean water before switching it on. The water should
be poured in through the priming plug.
7).Figure. G: When there is risk of freezing, empty the electric pump through the drain plug on the
bottom
of pump body, making sure you prime it when subsequently starting it again; check that the foot valve is
clean at regular intervals; if the electric pump is to remain unused for a long period of time(e.g. in the
winter), it is advisable to empty it completely, rinse it with clean water and store it in a dry place.
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