7
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Minimum required liquid level during operation
/ Example of
Minimum required liquid level for continuous operation is 16 inches (400 mm).
Keep the minimum liquid level during operation, enough to submerge the whole pump. (Liquid level for
continuous operation: 16 inches/400mm or higher from the pump’s bottom surface.) Operation below
the required liquid level, such as for dead head operation, should be less than 5 minutes.
Do not repeatedly run for less than 5 minutes.
Depending on the operational situation, the incorporated thermal protector may get activated to stop
the pump in order to protect the motor. In that case, stop the operation for a while. Check the pump
status and ensure the proper liquid level to resume the operation.
Minimum liquid level for operation is 5.1 inches (130 mm).
The minimum liquid level for operation is 5.1 inches/130mm
from the pump’s bottom surface.
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Even with the proper operational liquid level, depending on the liquid surface condition, there is a
chance that the operation may be interrupted due to air entering.
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If the impeller of the pump runs with air, the rotating parts may be damaged.
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Example of installation
To prevent water hammer, refer to the following image for pipe installation.
Model description
YD
– 50 02 GWN1 – CP – A D 6 2 – HP - V
(1) (2) (3) (4) (5) (6) (7) (8) (9)
(1) Bore:
50 = 50A
(2) Motor output:
02 = 1.1kW = 1.5HP
(3) Main cover material: CFR PP
Pressure gauge
Sluice valve
Check valve
Air release pipe
(Always open slightly)
Min. liquid level for
continuous operation
(16 inches/400mm)
Operational min. liquid
level
(5.1 inches/130mm)
