Points to be observed during operation.
If pump enters continuous operation mode, check flow
meter and confirm that pump operation is as per
specifications.
Remarks
• Suction valve-Fully opened
• Discharge valve-Fully opened
• Confirm pump is filled with liquid. If pump is not filled
with liquid, fill it in accordance with steps [4] and [5] of
'Preparation for start-up'. After priming completely,
close the discharge valve fully.
• Supply power immediately to run the pump only when
checking the rotating direction of the pump. (Correct
direction of pump operation is indicated with arrow on
the pump. Check the direction of motor fan by looking
at the fan through the fan cover.)
• Observe carefully to see if the motor fan slowly and
smoothly stops rotating when the power switch is turned
off.
Note: If the motor fan does not stop smoothly, it is
possible that the pump is locked inside.
In this case, contact your IWAKI dealer.
• Open valve carefully while paying attention to
amperemeter, to prevent motor from being overloaded
from excessive opening of valve.
* Within 1 minute, open the discharge valve gradually and
adjust the discharge pressure while checking the reading
of the pressure gauge on the discharge side. (Otherwise,
adjust the flow rate while checking the reading of the
flowrate meter.)
Caution
Total discharge pressure is increased to shut-off
pressure after start of normal pump operation,
open discharge valve gradually to set.
Operation Step
• Close or open the valve.
• Prime the pump
• Check the motor for correct rotating direction.
Switch on the power and then immediately switch off the
power.
• Turn on the power and start the pump. Then, adjust the
discharge pressure and discharge volume.
Following discharge volumes should be noted during pump operation.
MDF-L250 and 401: 10
r
/min. or above
MDF-L422 and 423: 20
r
/min. or above
MDF-L425, 505, 507, 657, 6510, and 6515: 50
r
/min. or above
• In case of automatic drive, too, close discharge valve before start-up and open valve slowly after start-up.
Caution
Do not run pump longer than 1 minute against a fully closed discharge valve.
M
Operation
Operate the pump by following the steps given below.
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No
1
2
3
4
• If flow meter is not available, check the values of
discharge pressure, suction pressure, and electric current
with reference to piping resistance.
5
