Maintenance, Service, Spare Parts - Espa Multi VX Manuel D'instructions

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6.2.2 Overload protection (three- - - - phase motors)

6.2.2 Overload protection (three

You must provide the overload protection (thermal relay or motor protector)

Adjust the thermal relay or motor protector to the nominal current value of the electric pump or to the operating current in case the motor is not used at full

load. If the motor has a star-delta starting system, adjust the thermal relay to a value equal to 58% of the nominal current or operating current.

6.2.3 Protection Against Dry Running

Avoid the possibility of dry running, i.e. the pump must not run without water inside it. Make sure that the electric panel is equipped with a dry running

protection system to which you must connect a pressure switch or float switch or sensors or other suitable device.

If the pump sucks the water from a water system, you can install a pressure switch on the suction side to switch off the pump in the event of low water system

pressure (always refer to the regulations locally in force). If the pump sucks the water from a storage tank or reservoir, you can install a float switch or sensors

to switch off the pump in the event of low water level.

6.3 Priming

Fill the pump and suction pipes with water before starting the unit. Dry running can damage the pump.

Pay attention to the instructions contained in this chapter and to the diagrams in sections 11.15, 11.16 and 11.17.

6.3.1 Suction From a Higher Level or From the Water System (Positive Suction Head)

Shut the on-off valve located downstream from the pump.

6.3.1.1 Multi VX

6.3.1.1

Multi VX 1, 3, 5

1, 3, 5 Series

Series

6.3.1.1

Multi VX

1, 3, 5

Series

Loosen the drain plug pin to end of travel without forcing it. Remove the fill plug/air valve and open the on-off valve upstream until the water flows out of the

fill plug/air valve. Tighten the drain plug pin to the end of travel without forcing it. Replace the fill plug/air valve.

6.3.1.2 Multi VX

6.3.1.2

Multi VX 10, 15, 20

10, 15, 20 Series

Series

6.3.1.2

Multi VX

10, 15, 20

Series

Remove the fill plug/air valve and open the on-off valve upstream until the water flows out of the fill plug/air valve. Close the fill plug/air valve. You can use the

fill plug with air screw or the one without air screw.

6.3.2 Suction From a Lower Level (Suction Lift)

Open the on-off valve located upstream from the pump and close the on-off valve downstream.

6.3.2.1

6.3.2.1 Multi VX

Multi VX 1, 3, 5

1, 3, 5 Series

Series

6.3.2.1

Multi VX

1, 3, 5

Series

Loosen the drain plug pin to end of travel without forcing it. Remove the fill plug/air valve and fill the pump. Replace the fill plug/air valve and tighten the drain

plug pin to the end of travel without forcing it.

6.3.2.2

6.3.2.2 Multi VX

Multi VX 10, 15, 20

10, 15, 20 Series

Series

6.3.2.2

Multi VX

10, 15, 20

Series

Remove the fill plug/air valve and fill the pump. Replace the fill plug/air valve.

6.4 Checking the Rotation Direction of Three- - - - Phase Motors

6.4 Checking the Rotation Direction of Three

When the pump has been electrically connected (➜ section 6.2) and primed (➜ section 6.3), make sure the on-off valve downstream from the pump is closed.

Start the pump and check the direction of rotation through the coupling protection or through the motor fan cover (for the three-phase versions). Arrows on the

adaptor, coupling and/or motor fan cover, indicate the correct rotation direction. If the rotation direction is incorrect, stop the pump, disconnect the power

supply and exchange the position of two wires in the motor's terminal board or in the electric control panel.

6.5 Operation

Start the pump, keeping the on-off valve downstream from the pump closed. Open the on-off valve gradually. The pump must run smoothly and noiselessly.

If necessary, re-prime the pump. Check the current absorbed by the motor and, if necessary, adjusts the setting of the thermal relay. Any air pockets trapped

inside the pump may be released by loosening the fill plug or by turning the air screw.

If a pump installed in a location where freezing may occur remains inactive, you must drain it through the drain plugs. This operation is not necessary if a

suitable antifreeze has been added to the water.

Make sure that the drained liquid does not cause damage or injuries.

7. Maintenance, Service, Spare Parts

Before performing any maintenance operations on the electric pump, make sure that the motor is voltage-free.

Maintenance operations must be performed by skilled and qualified personnel only. Use suitable equipment and protection devices. Observe the

accident prevention regulations in force. If you need to drain the pump, make sure that the drained liquid does not cause damage or injuries.

The pump is supplied with a calibrated fork-shaped shim designed to facilitate the motor coupling and replacement operations.

7.1 Routine Maintenance

The pump does not require any scheduled routine maintenance. In general, we recommend that you check the following aspects, or some of them, at varying

intervals depending on the operating conditions: pumped liquid leaks, delivery pressure, starts per hour, noise, triggering of the electrical protections (relays,

fuses,...).

If the user wishes to draw up a maintenance schedule, he/she must keep in mind that the deadlines depend on the type of liquid pumps and the operating

conditions.

7.2 Extraordinary Maintenance

Extraordinary maintenance may be necessary in order to clean the liquid end or replace the mechanical seal and other worn parts.

phase motors)

Phase Motors

- 17 -

Information for maintenance personnel

Information for

maintenance personnel

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