Caution
Periodically clean the strainer located on the pump suction side. A clogged
strainer may cause pressure fluctuations, a lower discharge rate, abnormal noise,
and other problems, thus leading to a pump failure.
(2) If you do not use the pump for a long time, observe the following points:
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To prevent possible freezing inside the pump in winter, be sure to take antifreeze measures such
as heat insulation or the installation of a heater to the pump or completely drain the pump.
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If mechanical seal is used for the shaft, its sliding surface may become sticking in place, thus
making it difficult to rotate the shaft smoothly. Therefore, periodically run the pump to maintain its
smooth rotation. Moreover, before running the pump, turn the pump shaft by hand
to check its
smooth rotation.
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If you have a backup pump, run it from time to time to make it available for operation at any time.
5.2 Mechanical
seal
(1) The mechanical seal is a precision part for preventing water leakage from the clearance of the
pump shaft. Carefully handle the seal to ensure the proper operation of the pump.
(2) The mechanical seal is a consumable. It wears at a different rate depending on the properties of
circulating liquid, the presence of foreign matter, operating pressure, and other factors; and the
service life changes accordingly.
(3) If there is any water leakage at the mechanical seal, replace it.
During the initial period of running a new pump, a small amount of leak may occur until the sliding
surfaces on the mechanical seal completely settle (or fit) into place, and the leak should stop in
several hours of operation. Since this initial leak does not mean a defect of the mechanical seal,
you can normally use the pump.
(4) Do not energize the pump without priming it. Otherwise, mechanical seal may be damaged and
leakage may occur.
5.3
How to adjust the mechanical seal
(1) Ensure that the power supply is turned off to prevent the pump from starting.
(2) Close the sluice valves on the suction and discharge sides of the pump to drain the water inside
the pump via the drain plug.
Warning
Before turning the pump shaft by hand to check its smooth rotation, be sure to
turn off the main power. Otherwise, the pump may start unexpectedly, thus
leading to an accident.
Caution
Do not touch the sliding surface of the mechanical seal with your hands.
In addition, keep the surface free from dust and debris.
Warning
Before adjusting the mechanical seal, be sure to turn off the power supply.
The pump may suddenly start up in automatic mode or on other occasions, thus
leading to great danger.
Caution
If hot water is handled, carefully drain the liquid. Contact with hot water may
cause the skin to be burned.