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For versions with 2.2 kW and higher powers,
WARNING
an overload protection (thermal relay or
motor protector) must be provided. If a different motor from the
standard one Lowara provides is used, read the operating
instructions to ensure whether the protection is provided or not.
Adjust the thermal relay or motor protector to the nominal current
value of the electric pump unit or to the operating current if the
motor is not used at full load.
6.2.2 Overload protection (three-phase motors)
Provide the overload protection (thermal relay
WARNING
or motor protector)
Adjust the thermal relay or motor protector to the nominal current
value of the electric pump unit 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
WARNING
pump must not run without water inside it.
Make sure that the electric panel is equipped with a dry running
protection system to which a pressure switch or float switch or
sensors or other suitable device must be connected.
If the pump sucks the water from the mains, a pressure switch can
be installed on the suction side to switch off the pump in the event
of low mains pressure (always refer to the regulations locally in
force). If the pump sucks the water from a storage tank or reservoir,
a float switch or sensors to switch off the pump in the event of low
water level can be installed.
6.3 Priming
Fill the pump and suction pipes with water
WARNING
before starting the unit. Dry running can
damage the pump.
Pay attention to the instructions contained in this chapter and to
the diagrams in Fig.Na and Fig.Nb for placement of the plugs.
Fig.Na , Nb KEY
A Fill plug with air valve (R3/8 for 1, 3, 5, 10, 15, 22SV, G 1/2 in
all other cases)
B Fill plug (R3/8 for 1, 3, 5, 10, 15, 22SV , G 1/2 in all other
cases)
C Drain plug (R3/8 for 10, 15, 22SV , G 1/2 in all other cases)
D Plug for drum, if present (do not unscrew)
E Gauge connection plug (R 3/8) only for 33, 46, 66, 92, 125SV
1 Fill plug with open air valve
2 Fill plug with closed air valve
3 Version without plug and drum
4 Version with plug but no drum (do not unscrew)
5 Version with plug and drum (do not unscrew)
Pay attention to Fig.Pa , Fig.Pb and to the KEY below for correct
application of the procedures in 6.3.1 and 6.3.2.
Fig.Pa , Pb KEY
A Fill and air plug
B Drain plug
C Fill plug
D Funnel
20
6.3.1 Suction from a Higher Level or From the Water Mains
(Positive Suction Head
)
Shut the on-off valve located downstream from the pump.
6.3.1.1
1, 3, 5SV Series
Loosen the drain plug pin B to end of travel without forcing it.
Remove the fill plug/air valve A and open the on-off valve
upstream until the water flows out of the fill plug/air valve A.
Tighten the drain plug pin B to the end of travel without forcing
it. Replace the fill plug/air valve A.
6.3.1.2
10, 15, 22, 33, 46, 66, 92, 125SV Series
Remove the fill plug/air valve A and open the on-off valve
upstream until the water flows out of the fill plug/air valve A.
Close the fill plug/air valve A. Fill plug C can be used instead of
plug A.
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
1, 3, 5SV Series
Loosen the drain plug pin B to end of travel without forcing it.
Remove the fill plug/air valve A and fill the pump using a funnel
until water flows out. Replace the fill plug/air valve A and tighten
the drain plug pin B to the end of travel without forcing it .
6.3.2.2 10, 15, 22, 33, 46, 66, 92, 125SV Series
Remove the fill plug/air valve A and fill the pump using a
funnel.Replace the fill plug/air valve A. Fill plug C can be used
instead of plug A.
6.4 Checking the Rotation Direction of Three-Phase Motors
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). The correct rotation direction is indicated by
arrows on the adaptor, coupling and/or motor fan cover. 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 quietly.
If necessary, re-prime the pump. Check the current absorbed by
the motor and, if necessary, adjust the setting of the thermal
relay. Any air pockets trapped inside the pump may be released by
turning the air
screw.
If a pump installed in a location where
WARNING
freezing may occur remains inactive, drain it
through the drain plugs. This operation is not necessary if suitable
antifreeze has been added to the water.
Make sure that the drained liquid does not cause
damage or injuries.
During operation, the outer surface of the pump (if hot
liquids are being pumped) and the outer surface of the
motor can exceed 40°C. Do not touch with parts of the
body (e.g.: hands) and do not put combustible material
in contact with the pump.
Please refer to Fig.Q, Fig.R, Fig.S for torques to
WARNING
be applied in threaded elements (bolts and
plugs, mating between motor and adapter, mating between
couplings).
For applicable Forces and Torques to the
WARNING
flanges please refer to Fig.T
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