Grundfos LS Series User manual

LS
Horizontal split case pump
Installation and operating instructions
GRUNDFOS INSTRUCTIONS
Installation and operating instructions
http://net.grundfos.com/qr/i/99536991

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions
describe LS.
Sections 1-4 give the information necessary to be
able to unpack, install and start up the product in a
safe way.
Sections 5-10 give important information about the
product, as well as information on service, fault
finding and disposal of the product.
CONTENTS
Page
1. General information
Grundfos LS horizontal 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 LS 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.
The hazard statements are structured in the
following way:
1. General information 2
1.1 Hazard statements 2
1.2 Notes 3
2. Receiving the product 3
2.1 Inspecting the product 3
2.2 Temporary storage 3
3. Installing the product 4
3.1 Location 4
3.2 Mechanical installation 4
3.3 Electrical connection 8
3.4 Pipes 9
3.5 Inlet pipe guidelines 11
4. Starting up the product 13
4.1 General information 13
4.2 Prestart checks 13
4.3 Priming 14
4.4 Startup 15
4.5 Final alignment 16
4.6 Greasing the grid coupling 17
5. Product introduction 18
5.1 Applications 18
5.2 Pumped liquids 18
5.3 Identification 18
6. Servicing the product 21
6.1 Contaminated pumps 21
6.2 Operating checks 21
6.3 Maintaining the product 21
7. Taking the product out of operation 23
7.1 Short-term shutdown 23
7.2 Long-term shutdown 24
8. Fault finding the product 25
9. Technical data 28
9.1 Operating conditions 28
9.2 Flange forces and torques 30
9.3 Sound pressure level 32
10. Disposing of the product 33
Read this document and the online version
of the installation and operating
instructions before installing the product.
Installation and operation must comply
with local regulations and accepted codes
of good practice.
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.
SIGNAL WORD
Description of hazard
Consequence of ignoring the warning.
- Action to avoid the hazard.

English (GB)
3
1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
2. Receiving the product
2.1 Inspecting the product
The pump is delivered from the factory in a crate or
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, promptly
notify Grundfos' representative and the carrier's
agent at once.
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
6.3.3 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.
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.
Bolts for LS 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.

English (GB)
4
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.
Fig. 1 LS pump with accessibility for inspection
and headroom for the use of an
overhead crane
Install the pump as close as possible to the supply of
pumped liquid, so that the inlet pipe is as short and
direct as possible.
3.2 Mechanical installation
3.2.1 Lifting the product
Lift the pump by means of nylon straps and shackles.
Fig. 2 How to lift and handle the LS pumps
Fig. 3 How to lift and handle the LS bare shaft
pumps
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.
TM04 0382 1016
WARNING
Crushing hazard
Death or serious personal injury
- Make sure that all installations are
performed by persons experienced in
the placement, alignment and
connection of pumping equipment.
WARNING
Crushing hazard
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.
TM06 8170 4816TM04 0380 0608

English (GB)
5
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).
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,
thus 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 Foundation and preliminary alignment
procedure
The foundation and preliminary alignment procedure
has four steps:
1. pouring of foundation
2. shimming of base frame
3. preliminary alignment
4. 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
fig. 4. Allow enough bolt length to reach through
grout, shims, lower base frame, nuts and
washers.
Fig. 4 Typical anchor bolt design
Let the foundation cure for several days before the
base frame is shimmed and grouted.
Do not fit expansion joints to make up for
inaccuracies in the pipes, such as centre
displacement or misalignment of flanges.
TM04 0383 0608
5-10 mm
Bolt length
above base
frame
Thickness of
base frame
19 to 32 mm
allowance for
grout
Base frame
Top of
foundation left
rough
Pipe sleeveLugWasher
Wedges and
shims left in
place

English (GB)
6
Shimming of base frame
Fig. 5 Shimming of base frame and levelling of
pump
1. Lift/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 fig. 5.
2. Level the base frame by adding or removing
shims under the base frame. See fig. 5.
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.
Preliminary alignment
The pump and motor are pre-aligned on the base
frame from the factory. Some deformation of the
base frame may occur during transport and it is
therefore essential to check alignment at the
installation site before final grouting.
Inaccurate alignment results in vibration and
excessive wear on the bearings, shaft and wear
rings.
Carry out alignment of the motor by placing shims of
different thickness under the motor. If possible,
replace several thin shims with one thick shim.
The preliminary alignment procedure has four steps:
1. 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.
2. Checking soft foot on pump and motor
A pump or a motor having a soft foot can be
compared to sitting down at a table and finding that
the table rocks when someone leans on it.
Technically, it is a condition where the feet of a motor
or a pump are not at the same level as the base
plate.
To check for soft foot, set the pump or motor on its
base plate and bolt it down. Set a dial gauge on one
foot, loosen the hold-down bolt, and watch the dial
gauge. If the dial gauge indicator moves while
loosening the bolt, the pump or motor has soft foot.
The movement measured by the dial gauge indicates
how many shims you need to level the pump or
motor. Repeat this procedure at all four corners.
If the pump was installed a long time ago, the
stresses induced in the pump casing by soft foot can
cause permanent deformation of the casing.
3. Checking parallel alignment
Place a straight edge across both coupling rims at
the top, the bottom and both sides. See fig. 6. After
each adjustment, recheck all features of alignment.
Parallel alignment is correct when the measurements
show that all points of the coupling faces are within
0.2 mm of each other.
Fig. 6 Checking parallel alignment
TM04 0381 0608
DANGER
Electric shock
Death or serious personal injury
- Before starting work on the pump, make
sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
Carry out alignment of the motor only, as
pipe strain will occur if the pump is shifted.
For a coupling with
an outside diameter
of ∅ [mm]
Coupling clearance
[mm]
Nominal Tolerance
∅90-213 3.2 0/-1
∅251-270 4.8 0/-1
∅306-757 6.4 0/-1
TM03 0209 4504
Vertical Horizontal

English (GB)
7
4. Checking angular alignment
Insert a pair of inside callipers or a taper gauge at
four points at 90 ° intervals around the coupling. See
fig. 7. The angular alignment is correct when the
measurements show that all points of the coupling
faces are within 0.2 mm of each other.
Fig. 7 Checking angular alignment
Recheck the coupling clearance and tighten the set
screws on the couplings.
Tightening torques
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 top edge of
the base frame. See fig. 8. 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.
Fig. 8 Sectional view of foundation with anchor
bolt, grouting and base frame
TM03 0213 4504
Description Dimensions Tightening torque
[Nm]
Hexagon head
screw
M6 10 ± 2
M8 12 ± 2.4
M10 23 ± 4.6
M12 40 ± 8
M16 80 ± 16
M20 120 ± 24
M24 120 ± 24
Vertical Horizontal
TM04 0384 0608
5-10 mm
Base frame
Grout
Levelling
wedges or
shims left in
place
Top of
foundation left
rough
19 to 32
mm grout
Formwork

English (GB)
8
3.3 Electrical connection
The electrical connections must be carried out by an
authorised electrician in accordance with local
regulations.
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.
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.
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:
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.
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.
If in doubt whether the supplied motor can
handle frequency converter operation,
contact the motor supplier.
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.

English (GB)
9
3.4 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.
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.
You can avoid many NPSH problems if you install the
inlet pipe properly. See section 3.4.1 General
precautions.
In section 10. Disposing of the product, 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.
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.
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.
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.
The sizing and installation of the inlet pipe
is extremely important.

English (GB)
10
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.

English (GB)
11
3.5 Inlet pipe guidelines
3.5.1 Common guidelines
Avoid air pockets or turbulence in the inlet pipe
Never use reducers in a horizontal inlet pipe as shown in fig. 10. Instead, use an eccentric reducer as
illustrated in fig. 9.
3.5.2 Flooded systems
Closed systems and open systems where the liquid level is above the pump inlet.
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
TM04 0093 4907 TM04 0092 4907
Fig. 9 Correctly mounted reducer Fig. 10 Reducers resulting in air pockets and
turbulence
Eccentric reducer
Turbulent flow
Air pocket
Concentric reducer
Correct
TM04 0148 4907
Fig. 11 Correctly mounted inlet pipe
Eccentric reducer
Pipe sloping down
towards pump
Correct Wrong
TM04 0098 4907 TM04 0097 4907
Fig. 12 Correctly mounted inlet pipe Fig. 13 Inlet pipe resulting in air pockets
Eccentric reducer
Pipe sloping
up towards
pump
Eccentric reducer
Air pocket
Pipe sloping
down towards
pump

English (GB)
12
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.
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
TM04 0095 4907 TM04 0094 4907
Fig. 14 Correctly mounted inlet pipe Fig. 15 Inlet pipe resulting in air pockets
Eccentric reducer
Eccentric reducer
Air pocket
Correct Wrong
TM04 0150 4907 - TM07 2908 4418 TM04 0149 4907
Fig. 16 Recommended inlet pipe installation
with a length of straight pipe between
horizontal elbow and pump
Fig. 17 Unbalanced loading of a double-suction
impeller due to uneven flow through a
horizontal elbow close to the pump
DN
10 x DN
 10 x DN plus
expansion joint
DN
 [DN
3-5 x DN plus
expansion joint
Open system
Closed system
Uneven flow
Water pressure
increases here
causing a
greater flow to
one side of the
impeller than to
the other

English (GB)
13
3.5.6 Installations with vertical inlet pipe in
confined space
Fig. 18 Inlet diffuser (1) in the inlet pipe
4. Starting up the product
4.1 General information
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 startup procedure for the pumps has four steps:
1. Prestart checks. See section 4.2 Prestart checks.
2. Priming. See section 4.3 Priming.
3. Starting. See section 4.4 Startup.
4. Final alignment. See section 4.5 Final 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 6.3.3 Lubrication.
4.2.2 Stuffing boxes
Make sure that the stuffing box packing rings have
been properly tightened.
4.2.3 Pressure gauges
Make sure that the pressure gauge connections are
closed.
TM04 0096 4907
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.
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.
Only start the pump when you have gone
through all of the prestart checks.
This does not apply to pumps with
mechanical shaft seals.

English (GB)
14
4.2.4 Direction of rotation
Check the direction of rotation in the following way:
1. Disconnect the two coupling halves between
pump and motor.
2. Make sure that the motor shaft can turn freely.
3. Start the motor briefly to check the direction of
rotation. The correct direction of rotation is
indicated by the arrows on the pump casing.
4. If the direction of rotation is wrong, correct it by
interchanging two phases on the motor.
5. Check the direction of rotation again.
6. Reassemble the coupling and the guards.
4.3 Priming
Closed systems or open systems where the
liquid level is above the pump inlet (flooded
systems)
Fill the inlet pipe and pump with liquid and vent them
before the pump is started. Proceed as follows:
1. Close the outlet isolating or throttle valve.
2. Loosen the vent screw (17) and the plug for shaft
seal flushing (20d).
Fig. 19 Position of the vent valve and plug for
shaft seal flushing
3. Slowly open the isolating valve in the inlet pipe
until a steady flow of liquid runs out of the vent
hole.
4. Rotate the shaft by hand, if possible, while
priming and venting to free entrapped air from
the impeller channels.
5. Tighten the vent screw and completely open the
isolating or throttle valve(s).
Open systems where the liquid level is below the
pump inlet (suction lift systems)
Fill the inlet pipe and pump with liquid and vent them
before the pump is started. Proceed as follows:
Suction lift system with foot valve
1. Close the outlet isolating or throttle valve and
open the isolating valve in the inlet pipe.
2. Remove the vent screw and connect a priming
device to a drain hole.
3. Fill the inlet pipe and casing with liquid at a
pressure of 1 to 2 bar from an external source
until the inlet pipe and pump are completely filled
with liquid.
4. Rotate the shaft by hand while priming and
venting to free entrapped air from the impeller
channels.
5. Refit the vent screw and tighten it securely.
6. You can fill the inlet pipe with liquid and vent it
before you connect the pipe to the pump. You
can also install a priming device before the pump.
The direction of rotation of the pump is not
always the same as the flow direction.
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.
If not primed properly, the pump will not
deliver liquid.
TM04 2592 2708
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.

English (GB)
15
Suction lift system without foot valve
1. Connect an external vacuum pump to the vent
hole on the top of the pump casing.
2. Close the outlet isolating or throttle valve and
open the isolating valve in the inlet pipe.
3. Open the valves between the pump and vacuum
pump.
4. Start the external vacuum pump.
5. Pump until the inlet pipe and the pump are
completely filled with liquid.
6. Rotate the shaft by hand while priming and
venting to free entrapped air from the impeller
channels.
7. When the liquid runs out of the vacuum pump,
stop the external vacuum pump and close the
valves between the pump and vacuum pump.
4.3.1 Opening of valves
1. Open the valves for the flushing liquid to the
stuffing boxes.
2. Completely open the isolating valve on the inlet
side of the pump and leave the outlet isolating or
throttle valve partly open.
4.4 Startup
1. Start the pump.
2. 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.
Never let the pump run dry. The pump is
not self-priming.
Dry-running will cause serious damage to
the stuffing boxes, shaft seals, wear rings
and shaft sleeves.
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.
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.
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.

English (GB)
16
4.5 Final alignment
1. Let the pump run until it has reached its operating
temperature under normal operating conditions
(approximately 1 hour).
2. Stop the pump.
3. Remove the coupling guard.
4. Check the alignment on the coupling by means of
dial gauges. See below.
Checking coupling alignment by means of dial
gauges
Alternatively, use laser equipment for the final
alignment.
Fig. 20 The end view of the coupling is seen
from the motor
The coupling alignment procedure has four steps:
Parallel alignment - vertically
1. Mount the dial gauge (2) in position 0 ° (12
o'clock). See fig. 20.
2. Make the index lines on the two coupling halves.
See fig. 20.
3. Set the dial gauge pointer to zero, turn the motor
and pump shaft simultaneously until the dial
gauge is in position 180 ° (6 o'clock) and check
that the index lines are still in line.
4. Read the dial gauge (2). If the dial gauge shows
a deflection exceeding 0.2 mm, add or remove
the shims under the motor until the reading of the
dial gauge is within the allowable tolerance of 0.2
mm.
Parallel alignment - horizontally
1. Turn the motor and pump shaft to 270 ° (9
o'clock).
2. Set the dial gauge pointer to zero, turn the motor
and pump shaft to 90 ° (3 o'clock) and check that
the index lines are still in line.
3. Read the dial gauge. If the dial gauge shows a
deflection exceeding 0.2 mm, move the motor
sideways until the reading of the dial gauge is
within the allowable tolerance of 0.2 mm.
4. Remove the dial gauge (2).
Angular alignment - horizontally
1. Mount the dial gauge (1) in position 90 ° (3
o'clock). See fig. 20.
2. Make the index lines on the two coupling halves.
See fig. 20.
3. Set the dial gauge pointer to zero, turn the motor
and pump shaft simultaneously until the dial
gauge is in position 270 ° (9 o'clock) and check
that the index lines are still in line.
4. Read the dial gauge (1). If the dial gauge shows
a deflection exceeding 0.2 mm, move the motor
sideways until the deflection is halved.
5. Set the dial gauge pointer to zero, turn the motor
and pump shaft simultaneously until the dial
gauge is in position 90 ° (3 o'clock) and read the
dial gauge (1) again.
6. Now the reading must be within the allowable
tolerance of 0.2 mm. If not, repeat the procedure.
Make the final alignment by shimming the
motor only.
TM03 0210 4504TM03 2939 4905
0°
90°
180°
270°
Dial gauge (2) for
parallel alignment
Index
line
Dial gauge (1) for angular
alignment
(12)
(3)
(6)
(9)
TM03 2941 4905TM03 2942 4905

English (GB)
17
Angular alignment - vertically
1. Turn the motor and pump shaft until the dial
gauge (1) is in position 0 ° (12 o'clock).
2. Set the dial gauge pointer to zero, turn the motor
and pump shaft simultaneously until the dial
gauge is in position 180 ° (6 o'clock) and check
that the index lines are still in line.
3. Read the dial gauge (1). If the dial gauge shows
a deflection exceeding 0.2 mm, add or remove
the shims under the motor until the deflection is
halved.
4. Set the dial gauge pointer to zero, turn the motor
and pump shaft simultaneously until the dial
gauge is in position 0 ° (12 o'clock) and read the
dial gauge (1) again.
5. Now the reading must be within the allowable
tolerance of 0.2 mm. If not, repeat the procedure.
6. Remove the dial gauge (1).
Finish the alignment procedure by refitting and
tightening the coupling.
4.6 Greasing the grid coupling
Pack the spaces between and around the grid with
as much lubricant as possible and wipe off the
excess lubricant so that it is flush with the top of the
grid. See section 6.3.3 Lubrication.
Position the seals on the hubs so they line up with
the grooves in the coupling cover. Position the
gaskets on the flanges of the lower coupling cover
half and assemble the covers so that the matching
marks are on the same side.
Push the gaskets in until they stop against the seals
and secure the coupling cover halves with the
fasteners provided and tighten them properly. Make
sure that the gaskets stay in position during this
tightening procedure.
Once the coupling is completely assembled, remove
both of the lubricating plugs in the covers, insert a
lubricating nipple in one of the lubricating holes,
pump in lubricant until it is forced out of the opposite
lubricating hole and refit the two lubrication plugs.
The installation is now complete.
TM03 2940 4905
The coupling tolerances may differ from
coupling make to coupling make. For the
standard coupling, the allowable tolerance
is 0.2 mm. For other coupling types, see
the coupling data supplied with the pump.
WARNING
Crushing hazard
Death or serious personal injury
- To protect persons from rotating
machine parts, always install all guards
after the installation is complete and
before starting the pump.

English (GB)
18
5. Product introduction
5.1 Applications
Grundfos LS horizontal 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.
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.
5.3 Identification
The type designation and rating information of
Grundfos horizontal split case pumps are stated on
the nameplate. See fig. 21. The type designation
includes model number, size and type.
Permanent records for this pump are kept under its
year-week code and serial number (fig. 21, 4 and 5)
and this number must therefore be stated in all
correspondences and spare parts orders.
For more information about weight, see the label on
the packaging.
5.3.1 Nameplate
Fig. 21 Nameplate of CE-marked LS pump
CAUTION
Hot liquid
Minor or moderate personal injury
- Do not exceed the maximum
operating temperature stated on the
nameplate.
TM07 2166 3118
Pos. Description
1 Type designation
2 Product number
3 Place of production
4 Production year and week
5 Serial number
6 Maximum pressure and temperature
7 Rated flow rate (duty-point flow rate)
8 Head at rated flow rate (duty-point head)
9 Speed
10 Country of production
11 Reference to lubrication instruction. See
section 6.3.3 Lubrication.
12 Liquid temperature rating, only for WRAS-
approved pumps
13 Hydraulic pump efficiency at optimum
efficiency point
99476910
Refer LS I/O for lubrication instruction
ȘS %
DK - 8850 Bjerringbro, Denmark
LS100-80-242E/235 1F2DS BBQE 1 11/4
99281199 P1 1832 0001
16/100
0DGH in ;;;;
1755
73.9
80
27
WRAS23C
7\SH
Model
SW
n
Q
H
m3/h
min-1
bar/°Cmax
1 2 3 4 5 7
68912 131011

English (GB)
19
5.3.2 Type key
The type key is an explanation of the product type designation. See fig. 21, pos. 1.
Example LS 125 -100 -305X /273.1 , (W) 1 F2 D S BBQE 1
Type range
LS horizontal version
Nominal diameter of the inlet port (DN)
Nominal diameter of the outlet port (DN)
Maximum impeller diameter [mm]
If suffix is used:
"X" = different impeller or construction design for single-stage pump,
such as A, B, C....Z.
"x2" = double-stage impeller design.
Actual impeller diameter [mm]
Potable-water code (optional)
ACS or WRAS-certified pump
Pump variant
1: Basic version, grease-lubrication, pump with motor, common base frame, standard
coupling
2: Grease-lubrication, bare shaft pump with common base frame, standard coupling
3: Grease-lubrication, bare shaft pump
4: Grease-lubrication, pump with motor, separate base frames, spacer coupling
5: Grease-lubrication, bare shaft pump with separate base frame, spacer coupling
6: Oil-lubrication, pump with motor, common base frame, standard coupling
7: Oil-lubrication, bare shaft pump with common base frame, standard coupling
8: Oil-lubrication, bare shaft pump
9: Oil-lubrication, pump with motor, separate base frames, spacer coupling
0: Oil-lubrication, bare shaft pump with separate base frame, spacer coupling
X: Special variant
Code for pipe connection
F1: 10 bar, DIN PN 10 G1: 175 PSI (12 bar), ANSI 125LB/150LB
F2: 16 bar, DIN PN 16 G2: 250 PSI (17.2 bar), ANSI 250LB/300LB
F3: 25 bar, DIN PN 25 G3: 400 PSI (27.6 bar), ANSI 250LB/300LB
XX: Special flanges
Code for shaft and sleeve materials (sleeve is only used for 25 bar pump)
D: SS420 and no sleeve A: SS420 and SS304
E: SS304 and no sleeve C: SS420 and SS316
J: SS316 and no sleeve B: SS420 and bronze
L: Duplex stainless steel and no sleeve K: Duplex stainless steel and duplex stainless steel
X: Special

English (GB)
20
* Antimony, not approved for potable water.
The example shown is an LS 125-100-305F/273.1,
standard type with standard coupling, DIN PN 16
flange, cast iron pump casing with SS304 impeller,
BBQE mechanical shaft seal and clockwise direction
of rotation.
Code for pump casing and impeller materials
S: Cast iron and SS304 Q: Ductile iron and SS304
C: Cast iron and SS316 G: Ductile iron and SS316
B: Cast iron and bronze A: Ductile iron and bronze
D: Cast iron and duplex stainless steel H: Ductile iron and duplex stainless steel
U: SS304 and SS304 J: SS316 and SS316
K: Duplex stainless steel and duplex stainless steel
X: Special
Code for shaft seal or stuffing box
BAQE: Rubber bellows seal, unbalanced, carbon*/SiC, EPDM
BAQV: Rubber bellows seal, unbalanced, carbon*/SiC, FKM
AAQE: O-ring seal, unbalanced, carbon*/SiC, EPDM
AAQV: O-ring seal, unbalanced, carbon*/SiC, FKM
DAQE: O-ring seal, balanced, carbon*/SiC, EPDM
DAQV: O-ring seal, balanced, carbon*/SiC, FKM
SAQE: Rubber bellows seal, balanced, carbon*/SiC, EPDM
SAQV: Rubber bellows seal, balanced, carbon*/SiC, FKM
BBQE: Rubber bellows seal, unbalanced, carbon/SiC, EPDM
BBQV: Rubber bellows seal, unbalanced, carbon/SiC, FKM
ABQE: O-ring seal, unbalanced, carbon/SiC, EPDM
ABQV: O-ring seal, unbalanced, carbon/SiC, FKM
DBQE: O-ring seal, balanced, carbon/SiC, EPDM
DBQV: O-ring seal, balanced, carbon/SiC, FKM
SBQE: Rubber bellows seal, balanced, carbon/SiC, EPDM
SBQV: Rubber bellows seal, balanced, carbon/SiC, FKM
BQQE: Rubber bellows seal, unbalanced, SiC/SiC, EPDM
BQQV: Rubber bellows seal, unbalanced, SiC/SiC, FKM
AQQE: O-ring seal, unbalanced, SiC/SiC, EPDM
AQQV: O-ring seal, unbalanced, SiC/SiC, FKM
DQQE: O-ring seal, balanced, SiC/SiC, EPDM
DQQV: O-ring seal, balanced, SiC/SiC, FKM
SQQE: Rubber bellows seal, balanced, SiC/SiC, EPDM
SQQV: Rubber bellows seal, balanced, SiC/SiC, FKM
BBVP: Rubber bellows seal, carbon/aluminium oxide, nitrile rubber
SNEK: Stuffing box with synthetic polymer packing rings, uncooled, with internal barrier fluid
Direction of rotation
(Pump direction of rotation as seen from the motor end)
1: Clockwise
2: Counterclockwise
Example LS 125 -100 -305X /273.1 , (W) 1 F2 D S BBQE 1