5. Operation Step
M
Operation instructions
[1]
Never operate the pump dry or with the suction-side valve closed. Otherwise, the inside of the pump will be
damaged.
[2]
In the event of cavitation, stop the pump within a minute.
In addition, do not continue pump operation with the air mixed into the suction side.
[3]
If the magnet coupling disconnects, stop the pump within a minute. The power of the magnet coupling is
reduced if operation is continued with the coupling disconnected.
[4]
The temperature fluctuation should not exceed 80 ˚C through the operation modes of starting, stopping, and
operating the pump.
[5]
Before starting operation, close the discharge valve fully to prevent water hammer action upon start-up.
[6]
Note that pump operation with the discharge valve closed fully over a long time will raise the temperature of the
liquid inside the pump and finally damage the pump.
[7]
In the event of a service power failure, turn off the power switch immediately and close the discharge valve.
[8]
Make sure that intolerable pressure levels are not applied to the pump. Refer to "page 18 [11] Allowable
pressure limit" in "1. Handling Instruction."
[9]
Maximum pump surface temperature
The max. pump surface temperature of each model is shown in the table. Arrange protective measures in
accordance with the temperature levels.
- 27 -
Maximum surface temperature
when ambient temperature
is at 40 ˚C. (˚C)
MDF-L250
401
422, 423, 425
505, 507
657, 6510
6515
Model
Liquid temp (˚C)
100
90
90
90
90
90
95
2900
Rated speed
(min
-1
)
