Install The Pump; Electrical Installation; Prime The Pump - Lowara VM Serie Manual De Instalación, Funcionamiento Y Mantenimiento

• The following devices are recommended for use
on the suction side of the pump:
– When the liquid is pumped from a water sys-
tem, use a pressure switch.
– When the liquid is pumped from a storage
tank or reservoir, use a float switch or sen-
sors.
• When thermal relays are used, relays that are
sensitive to phase failure are recommended.
The motor checklist
Use cable according to rules with 3 leads (2+earth/
ground) for single phase versions and with 4 leads
(3+earth/ground) for three-phase version.

4.3 Install the pump

4.3.1 Install the pump on a concrete
foundation
For information about how to install the pump, see
Figure 5 (page 172).
1. Piping support
2. On-off valve
3. Flexible pipe or joint
4. Check valve
5. Control panel
6. Do not install elbows close to the pump
7. Bypass circuit
8. Eccentric reducer
9. Use wide bends
10. Positive gradient
11. Piping with equal or greater diameter than the
suction port
12. Use foot valve
13. Do not exceed maximum height difference
14. Ensure adequate submersion depth
1. Anchor the pump onto the concrete or equiva-
lent metal structure.
– If the liquid temperature exceeds 50°C, the
unit must be anchored only by the motor
bracket side and not also by the side of the
inlet supporting bracket
– If the transmission of vibrations can be dis-
turbing, then provide vibration-damping sup-
ports between the pump and the foundation.
2. Remove the plugs covering the ports.
3. Assemble the pipe to the pump threaded con-
nections.
Do not force the piping into place.

4.3.2 Electrical installation

Precautions
WARNING:
• 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 power
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 according
to the wiring diagram under the terminal box
cover.
a) Connect the ground (earth) lead.
Make sure that the ground (earth) lead is longer
than the phase leads.
b) Connect the phase leads.
NOTICE:
Tighten the cable glands carefully to ensure the
protection against the cable slipping and humid-
ity entering the terminal box.
2. If the motor is not equipped with automatic reset
thermal protection, then adjust the overload pro-
tection according to the nominal current 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 rat-
ed 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. Fail-
ure to do so can cause liquid to freeze and dam-
age the pump.
• The sum of the pressure on the suction side (wa-
ter mains, gravity tank) and the maximum pres-
sure that is delivered by the pump must not ex-
ceed the maximum working pressure that is al-
lowed (nominal pressure PN) for the pump.
• Do not use the pump if cavitation occurs. Cavita-
tion can damage the internal components.
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 (page 172).
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).
en - Original instructions
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