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4. Cautions for Operation
4.1 Cautions for Operation
See Danger (1)(2), P04
See Warning (8)(14)(15)(16), P04-P05
See Caution (4)(6)(7), P06
See Note (2)(3)(4)(5)(6)(7)(8)(9), P07
4.2 Operation of the Thermal Protection Relay
1) When the thermal protection relay operates, switch the pump power supply OFF (set to
O), remove the power cord from the outlet, and contact the manufacturer. Note that the
motor will be very hot and should not be touched.
2) Once the cause of the fault has been removed, wait until the motor cools and restart
operation.
See Caution (5), P06
4.3 Precautions when starting
1) Starting in cold weather
The bearing grease and cup packing may harden under cold conditions, and the pump
may be difficult to start. Use the following procedure in this case.
(1) Open the inlet to atmosphere, and switch power ON-OFF two or three times until
the pump starts. If the pump still does not start, raise the ambient temperature
above 7°C.
(2) With the inlet open to atmosphere, run the pump for a few minutes to warm it.
(3) Commence normal operation once the pump has warmed.
2) Precautions regarding the intake-side pressure
Set the intake-side pressure to atmospheric pressure when starting the pump.
If the pressure is lower than atmospheric pressure, it will apply a load on the motor and
may prevent the pump from starting.
If it is necessary to maintain a vacuum, attach a shut-off valve or three-way valve
between the pump and vessel. Refer to fig.3.4 for a piping example using a shut-off
valve.
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Warning
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Caution
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Note
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Danger
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Caution
