Davey VM Series - Starting and Maintenance

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5. STARTING AND MAINTENANCE
Before starting, read the warning sticker carefully on the pump sleeve.
Before commencing any works on the pump please ensure the system pressure has
been relieved and the pump has been isolated from ow.
Before removing the terminal box cover and before removing/dismantling the pump,
make sure that the electricity supply has been switched off.
1. Do not start the pump until it has been lled with liquid .
• Positive suction head installation:
Close the valve on the discharge side of the pump and release the air vent screw, slowly open the valve
on the suction side. Tighten the air vent screw when a steady stream of liquid runs out of it.
• Negative suction head installation:
Attention: Must t a check valve on the suction side.
Close the valve on the discharge side of the pump and release the air vent nut, inject liquid into the hole,
Tighten the air vent nut when the pump and suction pipelines are full of liquid.
Pay attention to the direction of the air vent plug hole and take care to ensure that
the escaping water does not cause injury to persons or damage to the motor or other
components.
Pay special attention to the risk of injury caused by scalding hot water.
2. Check before start the pump:
• Whether the foundation bolts is tightened;
• Whether the voltage of power supply is normal;
• Whether there is leakage of pipelines;
• Whether the suction valve is fully open;
• If tted pressure gauge, check whether the pressure metering range is suitable;
• Ensure pressure gauges are of suitable range for the pump size.
3. Check rotating direction
Briey switch on the power. supply and view the rotary direction by viewing the motor fan. Arrow on the pump
head indicates the correct direction of rotation.That is, from the motor end, pump shall run counter-clockwise.
If direction is not correct swap power supply and briey try again.
4. Frequency of starts and stops
Pump can not be started and stopped frequently. For motor power
≤4kW, starting times shall more than 100 times per hour; for motor power
>4kW, starting times shall not be more than 20 times per hour.
5. Please ensure the pump used is suitable for the application used, as incorrect application may result in
over heating.
6. Frost protection
Measures to provide frost protection should be taken when ambient temperature is less than 0°C. Pumps
which are not being used should be drained to avoid damage from freezing.
7. Regularly check pump for the following:
• Whether pump operation pressure is in the required range
• Whether there is leakage of pump and pipelines
• That motor is in operating temperature
• Clean/replace strainer
8. Pump shall be cleaned and stored appropriately when it is not used for a long time.