Electrical Installation; Commissioning, Startup, Operation, And Shutdown - Xylem LOWARA 1 VM Série Manuel D'installation, D'utilisation Et D'entretien

4.3.2 Electrical installation

Precautions
Electrical Hazard:
• Make sure that all connections are
performed by qualified installation
technicians and in compliance with
the regulations in force.
• Before starting work on the unit,
make sure that the unit and the con-
trol panel are isolated from the pow-
er supply and cannot be energized.
Grounding (earthing)
Electrical Hazard:
• Always connect the external protec-
tion conductor to ground (earth) ter-
minal before making other electrical
connections.
Connect the cable
1. Connect and fasten the power cables accord-
ing to the wiring diagram under the terminal
box cover.
a) Connect the ground (earth) lead.
Make sure that the ground (earth) lead is lon-
ger than the phase leads.
b) Connect the phase leads.
NOTICE:
Tighten the cable glands carefully to ensure
the protection against the cable slipping and
humidity entering the terminal box.
2. If the motor is not equipped with automatic re-
set thermal protection, then adjust the over-
load protection according to the nominal cur-
rent value of electric pump (data plate).
5 Commissioning, Startup,
Operation, and Shutdown
Precautions
WARNING:
Make sure that the drained liquid does
not cause damage or injuries.
NOTICE:
• Never operate the pump below the minimum
rated flow.
• Never operate the pump with the delivery ON-
OFF valve closed for longer than a few seconds.
• Do not expose an idle pump to freezing condi-
tions. Drain all liquid that is inside the pump.
Failure to do so can cause liquid to freeze and
damage the pump.
• The sum of the pressure on the suction side
(water mains, gravity tank) and the maximum
pressure that is delivered by the pump must not
exceed the maximum working pressure that is
allowed (nominal pressure PN) for the pump.
• Do not use the pump if cavitation occurs. Cavi-
tation can damage the internal components.
en - Translation of the original instructions
Noise level
The sound pressure level of the units is lower than
70 LpA.
5.1 Prime the pump
For an illustration that shows the pump parts, see
Figure 6 .
1. Fill plug
2. Drain plug
3. Funnel
Installations with liquid level above the pump
(suction head)
1. Close the on-off valve located downstream
from the pump.
2. Loosen the drain plug pin (2a).
3. Remove the fill and vent plug (1) and open the
on-off valve upstream until the liquid flows out
of the hole.
4. Tighten the drain plug pin (2b).
5. Replace the fill plug (1).
Installations with liquid level below the pump
(suction lift)
1. Open the on-off valve that is located upstream
from the pump and close the on-off valve
downstream.
2. Loosen the drain plug pin (2a).
3. Remove the fill and vent plug (1) and use a fun-
nel to fill the pump until water flows out of the
hole.
4. Tighten the drain plug pin (2b).
5. Replace the fill plug (1).
5.2 Check the rotation direction (three-
phase motor)
Follow this procedure before start-up.
1. Start the motor.
2. Stop the motor.
3. If the rotation direction is incorrect, then do as
follows:
a) Disconnect the power supply.
b) In the terminal board of the motor or in the
electric control panel, exchange the position
of two of the three wires of the supply cable.
c) Check the direction of rotation again.
5.3 Start the pump
1. Start the motor.
2. Gradually open the on-off valve on the dis-
charge side of the pump.
At the expected operating conditions, the
pump must run smoothly and quietly. If not, re-
fer to Troubleshooting.
3. If the pump does not start in correctly in
30 seconds, then do the following:
a) Switch off the pump.
b) Reprime the pump.
c) Start the pump again.
4. Switch off and on the pump (for about 30 sec-
onds of continuos running) and make sure that
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