13
n
Check/Operation Step
Remarks
4.
Flow rate adjustment.
Open valve slowly, paying attention to the motor
Once total discharge pressure is increased to
amp meter to prevent it from being overloaded
shut off pressure. Open discharge valve
through excessive opening of the valve.
gradually to set discharge pressure to desired
specification.
Pump should be operated at a minimum flowrate:
400/401:
2.5 Gal/min (10L/min) or more
422/423/425: 5.0 Gal/min (20L/min) or more
In case of automatic control, close discharge valve when starting pump and gradually open the
discharge valve thereafter.
Don’t operate the pump with the discharge valve closed for more than one minute.
5.
Points to be observed during operation.
If flowmeter is unavailable, check values of
If pump enters continuous operation
discharge pressure, suction pressure and current
condition, check flow meter and confirm
in relation to piping resistance.
that pump operation meets specifications.
n
Stopping Operation
Check/Operation Step
Remarks
1.
Close discharge valve gradually.
Caution
Do not cause sudden closure by using solenoid
valve, etc. Otherwise, pump may be damaged by
water hammer.
2.
Stop motor.
Observe that the motor stops rotating slowly
and smoothly. If not, check inside of pump.
3.
Points to be observed when stopping pump.
If pump operation is stopped in cold weather, liquid inside the pump cavity may freeze and
damage the pump. Be sure to drain liquid completely. In case of short-term shut down, which
does not allow removal of liquid, use band heater, etc., to prevent liquid from freezing.
In case of service power failure turn OFF power switch and close discharge valve.
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