Grundfos LSV User manual

LSV
Single-stage vertical split case pump and double-stage vertical
split case pump
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

LSV
English (GB)
Installation and operating instructions ..................................5
Български (BG)
Упътване за монтаж и експлоатация.................................38
Čeština (CZ)
Montážní a provozní návod ........................................76
Deutsch (DE)
Montage- und Betriebsanleitung ....................................111
Dansk (DK)
Monterings- og driftsinstruktion .....................................149
Eesti (EE)
Paigaldus- ja kasutusjuhend.......................................182
Español (ES)
Instrucciones de instalación y funcionamiento...........................215
Suomi (FI)
Asennus- ja käyttöohjeet .........................................253
Français (FR)
Notice d'installation et de fonctionnement..............................287
Ελληνικά (GR)
Οδηγίες εγκατάστασης και λειτουργίας................................323
Hrvatski (HR)
Montažne i pogonske upute .......................................363
Magyar (HU)
Telepítési és üzemeltetési utasítás ..................................397
Italiano (IT)
Istruzioni di installazione e funzionamento .............................435
Lietuviškai (LT)
Įrengimo ir naudojimo instrukcija ....................................471
Latviešu (LV)
Uzstādīšanas un ekspluatācijas instrukcija .............................504
Nederlands (NL)
Installatie- en bedieningsinstructies ..................................541
Polski (PL)
Instrukcja montażu i eksploatacji....................................578
3
Table of contents

Português (PT)
Instruções de instalação e funcionamento .............................615
Română (RO)
Instrucţiuni de instalare şi utilizare...................................654
Srpski (RS)
Uputstvo za instalaciju i rad .......................................690
Svenska (SE)
Monterings- och driftsinstruktion ....................................725
Slovensko (SI)
Navodila za montažo in obratovanje .................................759
Slovenčina (SK)
Návod na montáž a prevádzku .....................................792
Türkçe (TR)
Montaj ve kullanım kılavuzu .......................................828
Українська (UA)
Інструкції з монтажу та експлуатації ................................863
Bahasa Indonesia (ID)
Petunjuk pengoperasian dan pemasangan.............................902
Қазақша (KZ)
Орнату және пайдалану нұсқаулықтары .............................936
Macedonian (MK)
Упатства за монтирање и ракување ................................975
(AR) 
    ............................................1014
Shqip (SQ)
Udhëzimet e instalimit dhe funksionimit ..............................1047
4LSV
Table of contents

English (GB) Installation and operating instructions
Original installation and operating instructions
Table of contents
1. General information ............. 6
1.1 Hazard statements .............. 6
1.2 Notes ..................... 6
2. Receiving the product............ 6
2.1 Inspecting the product ............ 6
2.2 Temporary storage .............. 7
3. Installing the product ............ 7
3.1 Location .................... 7
3.2 Mechanical installation ............ 7
3.3 Electrical connection .............11
3.4 Pipes .....................12
3.5 Inlet pipe guidelines..............14
4. Starting up the product ...........17
4.1 General information..............17
4.2 Prestart checks ................17
4.3 Priming ....................18
4.4 Startup.....................18
4.5 Alignment ...................19
5. Product introduction ............20
5.1 Applications ..................20
5.2 Pumped liquids ................20
5.3 Identification..................21
6. Servicing the product ............26
6.1 Contaminated pumps .............26
6.2 Operating checks ...............26
6.3 Maintaining the product............26
7. Taking the product out of operation ....28
7.1 Short-term shutdown .............28
7.2 Long-term shutdown .............28
8. Fault finding the product ..........29
8.1 The pump delivers no liquid .........29
8.2 The pump does not deliver enough liquid ..29
8.3 The pump does not create enough
pressure ....................30
8.4 The pump loses liquid after running for a
short time ...................31
8.5 The pump consumes too much power ....31
8.6 The motor is overloaded ...........32
8.7 Vibrations ...................32
8.8 Cavitation noise ................33
8.9 The pump bearings are overheated .....33
8.10 The pump operates for a short time and
then stops ...................33
9. Technical data ................34
9.1 Operating conditions .............34
9.2 Flange forces and torques ..........36
10. Disposing of the product ..........37
5
English (GB)

1. General information
Read this document before you install the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
Grundfos LSV vertical split-case pumps are supplied
either as a complete pump with motor, base frame
and approved coupling guard or as a bare-shaft
pump.
These instructions apply to both types.
The LSV pump can be driven by an electric motor or
another type of driver. In the following we assume
that the pump is driven by an electric motor.
1.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
DANGER
Indicates a hazardous situation which, if
not avoided, will result in death or serious
personal injury.
WARNING
Indicates a hazardous situation which, if
not avoided, could result in death or
serious personal injury.
CAUTION
Indicates a hazardous situation which, if
not avoided, could result in minor or
moderate personal injury.
The hazard statements are structured in the following
way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
Observe these instructions for explosion-
proof products.
A blue or grey circle with a white graphical
symbol indicates that an action must be
taken.
A red or grey circle with a diagonal bar,
possibly with a black graphical symbol,
indicates that an action must not be taken
or must be stopped.
If these instructions are not observed, it
may result in malfunction or damage to the
equipment.
Tips and advice that make the work easier.
2. Receiving the product
2.1 Inspecting the product
The pump is delivered from the factory in a crate or a
wooden box specially designed for transport by a
forklift truck or a similar vehicle.
Upon receipt, check the pump visually to determine
whether any damage has happened to it during
transport or handling.
Check especially for these points:
1. broken or cracked equipment, including base
frame, motor or pump feet and flanges
2. broken motor fan cover, bent eyebolts or
damaged terminal box
3. missing parts.
Parts or accessories are sometimes wrapped
individually or fastened to the equipment.
If any damage or losses have occurred, notify
Grundfos' representative and the carrier's agent at
once.
Bolts for LSV bare-shaft pumps have US
threads for which inch tools are required.
Bolts for coupling guard and for mounting
of pump and motor on the base frame
have metric threads.
6
English (GB)

2.2 Temporary storage
If you do not store or operate the pump soon after
arrival, store it in a clean, dry place with slow,
moderate changes in ambient temperature. Protect
the pump from moisture, dust, dirt and foreign bodies.
Avoid exposing the motor to direct, intense sunlight,
rain, snow, ice and also dust for an extended periods
of time. Attach a covering structure or an additional
cover when using or storing the product outdoors.
Before and during storage we recommend these
precautions:
1. Make sure that the bearings are filled with the
recommended grease to prevent moisture from
entering around the shaft. See section
Lubrication.
2. Make sure that the inlet and outlet ports and all
other openings are covered with cardboard, wood
or masking tape to prevent foreign objects from
entering the pump.
3. Cover the unit with a tarpaulin or other suitable
covering if it is to be stored where there is no
protective covering.
4. Rotate the shaft two turns every two weeks to
prevent corrosion of the bearing surfaces and the
stuffing box or sticking of the shaft seal faces.
Related information
6.3.3 Lubrication
3. Installing the product
3.1 Location
Install the pump with accessibility for inspection and
maintenance. Allow ample space and headroom for
the use of an overhead crane or hoist sufficiently
strong to lift the unit.
Install the pump as close as possible to the pump
liquid supply, so that the inlet pipe is as short and
direct as possible.
3.2 Mechanical installation
WARNING
Crushing of hands
Death or serious personal injury
‐Make sure that all installations are
performed by persons experienced in
the placement, alignment and
connection of pumping equipment.
3.2.1 Lifting the product
WARNING
Crushing of hands
Death or serious personal injury
‐Handling must be performed by
qualified persons.
‐When unloading the pump, lift equally
at four or more points on the base
frame. Do not lift by the motor or by the
pump. Do not lift by the flanges or by
the eyebolts on the motor.
WARNING
Crushing of hands
Death or serious personal injury
‐Make sure the product won't tilt and fall
down during transportation, installation
and unloading.
‐The unsecured pump must be placed
on horizontal plane to prevent it from
tilting and fall down.
Lift the pump by means of nylon straps and shackles.
TM073980
How to lift and handle the LSV pumps
7
English (GB)

TM073981
How to lift and handle the LSV bare-shaft pumps by
means of a U-type unbuckle
TM073976
How to lift and handle the LSV bare-shaft pumps by
means of the pump flange
TM073975
How to lift and handle the LSV bare-shaft pumps by
means of the pump flange and hanging ear
TM073977
Lifting the motor
8
English (GB)

3.2.2 Foundation
We recommend that you install the pump on a
concrete foundation, which is heavy enough to
provide permanent and rigid support for the entire
pump. The foundation must be capable of absorbing
any vibration, normal strain or shock. We recommend
that the weight of the concrete foundation is 3 times
the weight of the complete pump unit. For specific
requirements, consult the contractor, engineer, or
established industry standards.
In installations where silent operation is particularly
important, we recommend a foundation that is up to 5
times as heavy as the complete pump unit.
3.2.3 Vibration dampers
Vibration dampers may be required to prevent pump
vibrations from being transmitted to the building or the
pipes. In order to select the right type of vibration
damper, you need this information:
• Forces transmitted through the damper.
• Motor speed. Take the motor speed into account
in the case of speed control.
• Desired dampening in %. The recommended
value is 70 %.
The choice of vibration dampers differs from
installation to installation. In certain cases a wrong
damper may increase the vibration level. Vibration
dampers must therefore be sized by the supplier of
the vibration dampers.
3.2.4 Expansion joints
Expansion joints provide these advantages:
• absorption of thermal expansion and contraction
of pipes caused by variations in liquid temperature
• reduction of mechanical influences in connection
with pressure surges in the pipes
• isolation of structure-borne noise in the pipes
(only rubber bellows expansion joints).
Do not fit expansion joints to make up for
inaccuracies in the pipes, such as centre
displacement or misalignment of flanges.
Fit the expansion joints at a minimum distance of 2
pipe diameters (DN) away from the pump flange on
the inlet side. This prevents turbulence in the joints
ensuring optimum inlet conditions and minimum
pressure drop on the outlet side.
At flow velocities greater than 2.4 m/s, we
recommend that you fit larger expansion joints
matching the pipes.
3.2.5 Building up the foundation
The foundation procedure has three steps:
1. pouring of foundation
2. shimming of base frame
3. grouting.
Pouring of foundation
We recommend the following procedure to ensure a
good foundation:
1. Pour the foundation without interruptions to within
19-32 mm of the final level. Use vibrators to
ensure that the concrete is evenly distributed. The
top surface must be well scored and grooved
before the concrete sets. This provides a bonding
surface for the grout.
2. Embed anchor bolts in the concrete as shown in
figures below. Allow enough bolt length to reach
through grout, shims, lower base frame, nuts and
washers.
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10
8
7
65
4
1
2
3
9
TM075514
Typical anchor bolt design
Pos. Description
1 Bolt length above base frame
2 Thickness of base frame
3 19 to 32 mm allowance for grout
4 Washer
5 Lug
6 Pipe sleeve
7 Top of foundation left rough
8 Wedges and shims left in place
9 Base frame
10 5-10 mm
9
English (GB)

1
2
3
4
TM066124
LSV anchor bolt installation
Pos. Description
1 LSV stands
2 Grouted pad for anchoring or housekeeping
3 Wedges or shims, as required
4 Anchor bolts for supporting the base
Let the foundation cure for several days before the
base frame is shimmed and grouted.
Shimming of base frame
TM074091
Shimming of base frame and levelling of pump
1. Lift or jack up the base frame to the final level
19-32 mm above the concrete foundation, and
support the base frame by means of blocks and
shims, both at the anchor bolts and midway
between bolts. See figure above .
2. Level the base frame by adding or removing
shims under the base frame. See figure above.
3. Tighten the anchor bolt nuts against the base
frame. Make sure the pipes can be aligned to the
pump flanges without putting strain on the pipes
or flanges.
Grouting
Grouting compensates for uneven foundation,
distributes the weight of the unit, dampens vibrations
and prevents shifting. Use an approved, non-
shrinking grout. If you have questions or doubts about
the grouting, consult an expert on grouting.
Proceed as follows:
1. Build a strong formwork around the foundation to
contain the grout.
2. Soak the top of the concrete foundation
thoroughly, then remove surface water.
3. Fill the formwork with grout up to the bottom edge
of the base frame. See figure below. Allow the
grout to dry thoroughly before attaching the pipe
to the pump. 24 hours is sufficient time with
approved grouting procedure.
4. When the grout has thoroughly hardened, check
the anchor bolt nuts and tighten them if
necessary.
5. Approximately two weeks after the grout has been
poured, or when the grout has thoroughly dried,
apply an oil-based paint to the exposed edges of
the grout to prevent air and moisture from getting
in contact with the grout.
2
3
4
5
7
6
1
TM082324
Sectional view of foundation with anchor bolt,
grouting and base frame
Pos. Description
1 Base frame
2 Grout
3 Levelling wedges or shims left in place
4 Top of foundation left rough
5 19 to 32 mm grout
6 Formwork
7 5-10 mm
10
English (GB)

3.3 Electrical connection
The electrical connections must be carried out by an
authorised electrician in accordance with local
regulations.
DANGER
Electric shock
Death or serious personal injury
‐Before you remove the terminal box
cover and before you remove or
dismantle the pump, make sure that
the power supply has been switched
off and that it cannot be accidentally
switched on.
The operating voltage and frequency are marked on
the motor nameplate.
Make sure that the motor is suitable for the power
supply of the installation site.
Carry out the electrical connections as shown on the
motor nameplate or in the wiring diagram on the back
of the terminal box cover.
For further information, contact the motor supplier.
DANGER
Electric shock
Death or serious personal injury
‐Whenever you use powered equipment
in explosive surroundings, observe the
rules and regulations generally or
specifically imposed by the relevant
responsible authorities or trade
organisations.
3.3.1 Frequency converter operation
You can connect all three-phase motors to a
frequency converter.
However, frequency converter operation often
exposes the motor insulation system to a heavier load
and causes the motor to be more noisy than usual
due to eddy currents caused by voltage peaks.
If in doubt whether the supplied motor can
handle frequency converter operation,
contact the motor supplier.
In addition, large motors driven via a frequency
converter will be loaded by bearing currents.
When the pump is operated via a frequency
converter, check the following operating conditions:
Operating
conditions Action
2-, 4- and 6-pole
motors, frame
size 225 and
larger
Ensure that the non-drive-end
motor bearing is electrically
isolated.
Noise-critical
applications
Fit a dU/dt filter between the
motor and the frequency
converter. It reduces the voltage
peaks and thus the noise.
Particularly
noise-critical
applications
Fit a sinusoidal filter.
Cable length
Fit a cable that meets the
specifications laid down by the
frequency converter supplier.
The length of the cable between
the motor and frequency
converter affects the motor load.
Supply voltage
up to 500 V
Make sure that the motor is
suitable for frequency converter
operation.
Supply voltage
between 500 V
and 690 V
• Fit a dU/dt filter. It reduces
the voltage peaks and thus
the noise.
• Or make sure that the motor
has reinforced insulation.
Supply voltage of
690 V and
upwards
• Fit a dU/dt filter.
• Make sure that the motor has
reinforced insulation.
11
English (GB)

3.4 Pipes
Protective covers are fitted to the inlet and
outlet ports to prevent foreign bodies from
entering the pump during transportation
and installation. Remove these covers
from the pump before connecting any
pipes.
Inlet and outlet pipe
In order to minimise friction losses and hydraulic
noise in the pipes, choose a pipe that is one or two
sizes larger than the pump inlet and outlet ports.
Typically, flow velocities must not exceed 2 m/s (6 ft/
sec) for the inlet pipe (port) and 3 m/s (9 ft/sec) for
the outlet pipe (port).
Make sure that the NPSH available (NPSHA) is
higher than the NPSH required (NPSHR). NPSH =
Net Positive Suction Head.
3.4.1 General precautions
When installing the pipes, observe these precautions:
1. Always run the pipes directly to the pump.
2. Do not move the pump to the pipes. This could
make the final alignment impossible and cause
stress to the pump flanges and pipes.
Make sure that both the inlet and outlet
pipes are independently supported
near the pump so that no strain is
transmitted to the pump when you
tighten the flange bolts. Use pipe
hangers or other supports with
necessary spacing to provide support.
3. When you use expansion joints in the pipe
system, fit the joints at a minimum distance of 2
pipe diameters away from the pump on the inlet
side. This prevents turbulence in the joints, thus
ensuring optimum inlet conditions.
4. Install the pipes as straight as possible and avoid
unnecessary bends. Where necessary, use 45° or
long-sweep 90° fittings to reduce friction loss.
5. Make sure that all pipe joints are tight.
6. Where you use flanged joints, ensure that the
inside diameters match properly.
7. Remove burrs and sharp edges when making up
joints.
8. Make sure that the pipes do not cause stress or
strain in the pump.
9. Provide for expansion of pipe material by means
of expansion joints on both sides of the pump.
10. Always allow sufficient space and accessibility for
maintenance and inspection.
3.4.2 Inlet pipes
Place the pump below system liquid level whenever
possible. This will facilitate priming, assure a steady
liquid flow and provide a positive suction head.
The sizing and installation of the inlet pipe
is extremely important.
You can avoid many NPSH problems if you install the
inlet pipe properly. See section General precautions.
In section Inlet pipe guidelines, common inlet pipe
installations are illustrated for two situations:
•Flooded systems: Closed systems and open
systems where the liquid level is above the pump
inlet.
•Suction lift systems: Closed systems and open
systems where the liquid level is below the pump
inlet.
Related information
3.4.1 General precautions
10. Disposing of the product
3.4.3 Valves in the inlet pipe
If the pump is operating under permanent suction lift
conditions, install a non-return valve in the inlet pipe
to avoid having to prime the pump each time it is
started. The non-return valve must be of the flap type
or a foot-valve with a minimum of pressure loss.
3.4.4 Outlet pipe
The outlet pipe is usually preceded by a non-return
valve and an isolating or throttle valve. The non-
return valve protects the pump against excessive
counterpressure and reverse rotation of the pump
and prevents backflow through the pump in case of
operational stop or failure of the motor.
In order to minimise friction losses and hydraulic
noise in the pipes, flow velocities must not exceed 3
m/s (9 ft/sec) in the outlet pipe (port).
On long horizontal runs, keep the pipe as level as
possible.
Avoid high spots, such as loops, as they will collect
air and throttle the system or lead to uneven
pumping.
12
English (GB)

3.4.5 Auxiliary pipes
Drains
Install the drain pipes from the pump casing and
stuffing boxes to a convenient disposal point.
Flushing pipes
• Pumps fitted with stuffing boxes
When the inlet pressure is below the ambient
pressure, supply the stuffing boxes with liquid to
provide lubrication and prevent the ingress of air. This
is normally achieved via a flushing pipe from the
outlet side to the stuffing box. You can fit a control
valve or orifice plate in the flushing pipe to control the
pressure to the stuffing box.
If the pumped liquid is dirty and cannot be used for
flushing the packing rings, we recommend a separate
clean, compatible liquid supply to the stuffing box at 1
bar (15 psi) above the inlet pressure.
• Pumps fitted with mechanical seals
Seals requiring recirculation will normally be provided
with a flushing pipe from the pump casing.
3.4.6 Measuring instruments
To ensure continuous monitoring of operation, we
recommend that you install pressure gauges on the
pump inlet and outlet flanges. The pressure gauge on
the inlet side must be capable of measuring vacuum.
The pressure tappings must only be opened for test
purposes. The measuring range of the outlet side
pressure gauge must be minimum 20 % above the
maximum pump outlet pressure.
When measuring with pressure gauges on the pump
flanges, note that a pressure gauge does not register
dynamic pressure (velocity pressure). The diameters
of the inlet and outlet flanges are different, and this
results in different flow velocities in the two flanges.
Consequently, the pressure gauge on the outlet
flange will not show the pressure stated in the
technical documentation, but a value which may be
lower.
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English (GB)

3.5 Inlet pipe guidelines
3.5.1 Common guidelines
Avoid air pockets or turbulence in the inlet pipe
In suction lift systems, never use reducers in a
horizontal inlet pipe as shown in figure below.
Instead, use an eccentric reducer as illustrated in
figure below.
Correct Wrong
1
2
TM082776
Correctly mounted reducer
1
2
TM082777
Reducers resulting in air pockets and turbulence
Pos. Description
1 Eccentric reducer
2 Straight pipe
Pos. Description
1 Concentric reducer
2 Air pocket
3.5.2 Flooded systems
Closed systems and open systems where the liquid
level is above the pump inlet.
Correct
1 2
L>=3xD
ØD
TM082778
Correctly mounted inlet pipe
ØD
L>=3xD
1
2
TM082779
Correctly mounted inlet pipe
Pos. Description
1 Concentric reducer
2 Straight pipe
Pos. Description
1 Concentric reducer
2 Straight pipe
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English (GB)

3.5.3 Suction lift systems
Closed systems and open systems where the liquid level is below the pump inlet.
Install the inlet pipe sloping upwards towards the inlet port. Any high point in the pipe will be filled with air and
thus prevent proper operation of the pump. When reducing the pipe to the inlet port diameter, use an eccentric
reducer with the eccentric side down to avoid air pockets.
Correct Wrong
ØD
L>=4xD
1
2
TM082780
Correctly mounted inlet pipe
1 3
2
TM082781
Inlet pipe resulting in air pockets
Pos. Description
1 Eccentric reducer
2 Pipe sloping up towards pump
Pos. Description
1 Eccentric reducer
2 Air pocket
3 Pipe sloping down towards pump
3.5.4 Inlet pipe if the feed line comes in different horizontal planes
Avoid high spots, such as loops, as they will collect air and throttle the system or lead to uneven pumping.
Correct Wrong
1
TM082782
Correctly mounted inlet pipe
2
1
TM082783
Inlet pipe resulting in air pockets
Pos. Description
1 Eccentric reducer
Pos. Description
1 Eccentric reducer
2 Air pocket
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English (GB)

3.5.5 Inlet pipe with a horizontal elbow in the feed line
Make sure that the liquid flow is evenly distributed to both sides of the double-suction impeller.
There is always an uneven, turbulent flow through an elbow. See below. If you install an elbow in the inlet pipe
near the pump in a position other than vertical, more liquid will enter one side of the impeller than the other. This
will result in heavy, unbalanced thrust loads overheating the bearings, causing rapid wear and reducing the
hydraulic performance.
Correct Wrong
3-5 x DN
DN
TM082789
1
2
TM074034
Pos. Description
1 Uneven flow
2
Water pressure increases here causing a
greater flow to one side of the impeller
than to the other
Recommended inlet pipe installation with a length of
straight pipe between horizontal elbow and pump
Unbalanced loading of a double-suction impeller due
to uneven flow through a horizontal elbow close to
the pump
3.5.6 Installations with vertical inlet pipe in
confined space
1
TM074035
Inlet diffuser (1) in the inlet pipe
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English (GB)

4. Starting up the product
4.1 General information
Do not start the pump until it has been
filled with liquid and vented.
CAUTION
Biological hazard
Minor or moderate personal injury
‐When pumping drinking water, the
pump must be flushed thoroughly with
clean water before startup in order to
remove any foreign matters, such as
preservatives, test liquid or grease.
4.1.1 Pumps with stuffing box
In the case of pumps with stuffing box, check that the
stuffing box gland is correctly fitted. It must be
possible to turn the pump shaft manually. If the pump
has been inactive for a long period, turn it manually to
make sure it has not got stuck. Loosen the stuffing
box or remove the packing.
4.1.2 Flushing the pipe system
The pump is not designed to pump liquids
containing solid particles such as pipe
debris and welding slag. Before starting up
the pump, the pipe system must be
thoroughly cleaned, flushed and filled with
clean water.
The warranty does not cover any damage
caused by flushing the pipe system by
means of the pump.
The startup procedure for the pumps has four steps:
1. Prestart checks. See section Prestart checks.
2. Priming. See section Priming.
3. Starting. See section Startup.
4. Final alignment. See section Final alignment.
Only start the pump when you have
gone through all of the prestart checks.
Related information
4.2 Prestart checks
4.3 Priming
4.4 Startup
4.5 Alignment
4.2 Prestart checks
Prestart checks have four steps:
1. Bearings
2. Stuffing boxes
3. Pressure gauge
4. Direction of rotation.
4.2.1 Bearings
Make sure that all bearings are properly lubricated.
See section Lubrication.
Related information
6.3.3 Lubrication
4.2.2 Stuffing boxes
Make sure that the stuffing box packing rings have
been properly tightened.
This does not apply to pumps with
mechanical shaft seals.
4.2.3 Pressure gauges
Make sure that the pressure gauge connections are
closed.
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English (GB)

4.2.4 Direction of rotation
Check the direction of rotation in the following way:
1. Remove the coupling guard.
2. Disconnect the two coupling halves between
pump and motor.
3. Make sure that the motor shaft can turn freely.
4. Start the motor briefly to check the direction of
rotation. The correct direction of rotation is
indicated by the arrows on the pump casing.
The direction of rotation of the pump is
not always the same as the flow
direction.
5. If the direction of rotation is wrong, correct it by
interchanging two phases on the motor.
DANGER
Electric shock
Death or serious personal injury
‐Before interchanging two phases,
make sure that the power supply
has been switched off and that it
cannot be accidentally switched on.
6. Check the direction of rotation again.
7. Reassemble the coupling and the guards.
4.3 Priming
LSV pumps are non-self-priming and must be
completely primed, that is filled with liquid, before
starting.
The pump must not run dry. Dry-running
will cause serious damage to the stuffing
boxes, shaft seals, wear rings and shaft
sleeves.
If the pump will be operating with a positive inlet
pressure, prime it by opening the inlet valve and
allowing liquid to enter the pump housing. Open the
vents at the top of the upper pump housing and the
top of each inlet dome, and make sure that all air is
forced out of the pump by the liquid before closing the
vents.
Rotate the shaft by hand while priming and venting to
free entrapped air from the impeller passageways.
If the pump will be operating with a suction lift,
priming must be accomplished by other methods. Use
foot valves, ejectors or vacuum pumps, or fill the
pump housing and inlet line manually with liquid.
Never run the pump dry in the hope that it
will prime itself. The result will be serious
damage to the shaft seals, pump wear
rings and shaft sleeves.
4.4 Startup
Make sure that the pump is filled with
liquid. The pump must not run dry. Dry-
running will cause serious damage to the
stuffing boxes, shaft seals, wear rings and
shaft sleeves.
1. Start the pump.
2. WARNING
Hot or cold surface
Death or serious personal injury
‐Pay attention to the direction of the
vent hole, and ensure that the
escaping water does not cause
injury to persons or damage to the
motor or other components.
‐In hot-water installations, pay
special attention to the risk of injury
caused by scalding hot water and
hot surfaces.
‐In cold-liquid installations, pay
special attention to the risk of injury
caused by cold liquids and cold
surfaces.
Vent the pump during startup by loosening the
vent screw until a steady flow of liquid runs out of
the vent hole.
3. When the pipe system has been filled with liquid,
slowly open the outlet isolating or throttle valve
until it is completely open. Ensure that the
differential pressure developed by the pump is
within the performance range of the pump and/or
close to the designed duty point. Throttle the
outlet isolating valve or reduce the speed of the
pump if the flow exceeds the rated performance
range or the differential pressure is lower than the
rated performance range.
4. Adjust the stuffing box gland (stuffing boxes only).
With the pump running, tighten the stuffing box
gland to allow a leakage of 40-60 drops per
minute. This is required for shaft sleeve
lubrication. Tighten the stuffing box gland evenly
to provide uniform compression on the packing
rings. After initial startup, additional packing rings
and adjustment may be required until the packing
rings are properly seated.
5. Ensure the pump unit is operating smoothly
without abnormal noise, vibration or overheating.
Do not allow a stuffing box to run dry,
and do not overtighten the stuffing box
gland to eliminate leaking as the shaft
sleeve will become damaged.
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English (GB)

4.5 Alignment
Check shaft alignment after the pump installation is
completed.
The following anchoring and alignment procedures
are typical and, if performed with care, should result
in a smooth-running, trouble-free installation.
If the pump and motor were shipped mounted on the
pump base as an assembly, remove the coupling
guard.
The alignment procedure has two steps:
1. checking coupling clearance
2. coupling alignment.
Checking coupling clearance
Make sure that the gap between the coupling halves
is equal to the values in the table and that the
keyways are 180 ° displaced.
For a coupling with an
outside diameter of ⌀
[mm]
Coupling clearance [mm]
Nominal Tolerance
⌀90-150 3 0/-1
⌀220 4 0/-1
≥ ⌀260 5 0/-1
Coupling alignment
The pump and motor were accurately aligned at the
factory, but handling during shipment usually alters
this alignment. Using a small straightedge and feeler
gauges or a dial indicator, check for vertical and
angular misalignment of the coupling hubs. See
figures below.
Coupling alignment is proper when the dial indicator
reads no more than 0.13 mm runout in any direction,
or when the straightedge contacts both hubs evenly
in both horizontal and vertical positions. If
misalignment is detected, loosen the motor and shift
or shim as necessary to re-align, and then re-tighten
the bolts.
TM078710
Checking vertical alignment, pin and bush coupling
structure
TM074092
Checking angular alignment, pin and bush coupling
structure
For the clamping coupling structure, remove the
coupling, and check shaft alignment by using the
leverage dial gauge with magnetic base.
Put the magnetic base on the motor shaft, put the
gauge outfit on the pump shaft, and read the value on
the gauge when rotating the shaft. See figure below.
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English (GB)

1
TM073983
Check alignment, clamping coupling structure
Pos. Description
1 Leverage dial gauge
Recheck the coupling clearance and tighten the set
screws on the couplings.
Tightening torques
Description Dimensions Tightening torque
[Nm]
Hexagon
socket set
screws
M6 10 ± 2
M8 12 ± 2.4
M10 23 ± 4.6
M12 40 ± 8
M16 80 ± 16
M20 120 ± 24
M24 120 ± 24
WARNING
Crushing hazard
Death or serious personal injury
‐To protect persons from rotating
machine parts, always install coupling
guards after the installation is complete
and before starting the pump.
5. Product introduction
5.1 Applications
Grundfos LSV vertical split-case pumps are typically
used in these applications:
• circulation in heating- and air-conditioning
systems, water condensing and boiler feed
systems
• liquid transfer and pressure boosting in various
industrial systems
• water distribution and water treatment in public
water systems.
5.2 Pumped liquids
Clean, thin, non-aggressive liquids, not containing
solid particles or fibres. Do not pump liquids that will
attack the pump materials chemically.
CAUTION
Hot Liquid
Minor or moderate personal injury
‐Do not exceed the maximum operating
temperature stated on the nameplate.
When pumping liquids with a density and/or viscosity
higher than that of water, the head and flow will be
reduced. Alternatively, use motors with
correspondingly higher outputs.
The stuffing box packing rings or mechanical shaft
seal O-rings chosen must be suitable for the liquid to
be pumped.
Special stuffing box packing rings or shaft seal O-
rings may be required if you use the pump for
pumping treated water:
• at temperatures above 80 °C (176 °F).
• containing additives to prevent system corrosion,
calcareous deposits, etc. (this may be the case in
heating and ventilating systems).
When pumping liquids other than water, select an
appropriate stuffing box or shaft seal. For further
information, contact Grundfos.
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English (GB)